reference_no	citation	n_collections
26476	"Wilson, J.L. 1954. Late Cambrian and Early Ordovician Trilobites from the Marathon Uplift, Texas. Journal of Paleontology 28:249-285"	13
13	"Sepkoski Jr., J. J. 1998.  Unpublished data"	111
17050	"Cisne, J.L. 1973. Beecher’s Trilobite Bed revisited; ecology of an Ordovician deepwater fauna. Postilla 160:1-25"	1
17051	"Bayer, T. N. 1967. Repetitive benthonic community in the Maquoketa Fm. (Ord.) of MN. Journal of Paleontology 41:417-422"	1
11467	"Frey, R. C. 1987. The occurrence of pelecypods in early Paleozoic epeiric-sea environments, Late Ordovician of the Cincinnati, Ohio area. Palaios 2:3-23"	1
15027	"Bretsky, P.W. ,S.S. Bretsky, P.J. Schaefer. 1977. Molluscan and brachiopod dominated biofacies in the Platteville Formation (Middle Ordovician), upper Mississippi Valley. Bulletin of the Geological Society of Denmark 26:115-132"	3
17	"Adrain, J. M. and G. D. Edgecombe. 1997. Silurian (Wenlock) Calymenid trilobites from the Cape Phillips Formation, central Canadian Arctic. Journal of Paleontology 71:657-682"	10
18	"Watkins, R. and P. J. Coorough. 1997. Silurian sponge spicules from the Racine Formation, Wisconsin. Journal of Paleontology 71:208-214"	1
19	"Adrain, J. M. and L. Ramskold. 1997. Silurian Odontopleurinae (Trilobita) from the Cape Phillips Formation, Arctic Canada. Journal of Paleontology 71:237-261"	7
28	"Kleffner, M. A. 1991. Conodont biostratigraphy of the upper part of the Clinton Group and the Lockport Group (Silurian) in the Niagara Gorge region, New York and Ontario. Journal of Paleontology 65:500-511"	31
32	"Young, G. A. and J. P. A. Noble. 1990. Silurian Proporidae and Plasmoporidae (Anthozoa, Tabulata) from the Chaleurs Bay region, Canada. Journal of Paleontology 64:184-199"	9
35	"Kleffner, M. A. 1990. Wenlockian (Silurian) conodont biostratigraphy, depositional environments, and depositional history along the eastern flank of the Cincinnati Arch in southern Ohio. Journal of Paleontology 64:319-328"	52
46	"Patzkowsky, M. E. and S. M. Holland. 1999. Biofacies Replacement in a Sequence Stratigraphic Framework:  Middle and Upper Ordovician of the Nashville Dome, Tennessee, USA.  Unpublished data"	91
125	"Watkins, R. 1995. A silicified deep-water Silurian fauna from SE Wisconsin.  Unpublished data"	1
127	"Hickerson, W. 1995. An early Silurian (Early-Middle Llandoverian) trilobite fauna from the Mosalem Formation of northwestern Illinois.  Unpublished data"	1
134	"Hurst, J. M. and R. K. Pickerill. 1986. The relationship between sedimentary facies and faunal associations in the Llandovery siliclastic Ross Brook Formation, Arisaig, Nova Scotia.  Unpublished data"	42
148	"Pickerill, R. K. and J. M. Hurst. 1983. Sedimentary facies, depositional environments, and faunal associations of the lower Llandovery (Silurian) Beechill Cove Formation, Arisaig, Nova Scotia.  Unpublished data"	15
187	"Amsden, T. W. 1974. Late Ordovician and Early Silurian articulate brachiopods from Oklahoma, southwestern Illinois, and eastern Missouri.  Unpublished data"	9
200	"Eckert, J. D. 1984. Early Llandovery crinoids and stelleroids from the Cataract Group (Lower Silurian) in southern Ontario, Canada.  Unpublished data"	7
11635	"Boucot, A. J. ,J.F. Dewey, R. Fletcher, W.K. Fyson, J.G. Griffin, C.F. Hickox, W.S. McKerrow, A.M Ziegler. 1974. Geology of the Arisaig area, Antognish County, Nova Scotia. Geological Society of America Special Paper 139:1-191"	1
256	"Peel, J. S. 1977. Systematics and palaeontology of the Silurian gastropods of the Arisaig Group. Det Kongelige Danske Videnskabernes Selskab Biologiske Skrifter 21:1-89"	4
316	"Dalve, E. 1948. The fossil fauna of the Ordovician in the Cincinnati Region.  Unpublished data"	4
317	"Wilson, C. W. 1949. Pre-Chattanooga stratigraphy in Central Tennessee.  Unpublished data"	26
320	"Holland, S. M. 1988. Taphonomic effects of sea-floor exposure on an Ordovician brachiopod assemblage.  Unpublished data"	1
321	"Secrist, M. H. and W. R. Evitt. 1943. The paleontology and stratigraphy of the upper Martinsburg formation of Massanutten Mountain, Virginia.  Unpublished data"	5
350	"Stumm, E. C. 1964. Silurian and Devonian Corals of the Falls of the Ohio.  Unpublished data"	1
363	"Jin, J. and P. Copper. 1999. The deep-water brachiopod Dicoelosia King, 1850, from the early Silurian tropical carbonate shelf of Anticosti Island, eastern Canada. Journal of Paleontology 73:1042-1055"	2
401	"Patzkowsky, M. E. 1995. Gradient analysis of Middle Ordovician brachiopod biofacies: Biostratigraphic, biogeographic, and Macroevolutionary Implications.  Unpublished data"	23
432	"Von Tress, D. E. 1954. Some Waynesville and Liberty Bryozoa from Versailles, Ripley County, Indiana.  Unpublished data"	1
437	"Bartlett, Jr., C. S. and H. W. Webb. 1971. Geology of the Bristol and Wallace quadrangles, Virginia.  Unpublished data"	5
564	"Rigby, J. K. and R. C. Gutschick. 1976. Two new Lower Paelozoic Hexactinellid sponges from Utah and Oklahoma. Journal of Paleontology 50:79-85"	1
3818	"Rohr, D. M. and E.A. Measures. 2001. Middle Ordovician (Whiterockian) gastropods of western Newfoundland: Macluritoidea and Euomphaloidea. Journal of Paleontology 75:284-294"	4
3828	"Sweet, W. C. 1954. Harding and Fremont Formations, Colorado. Bulletin of the American Association of Petroleum Geologists 38:284-305"	3
3834	"Sweet, W. C. 1955. Cephalopods from the Fremont Formation of Central Colorado. Journal of Paleontology 29:71-82"	1
3835	"Frederickson, E. A. and J. M. Pollack. 1952. Two Trilobite Genera from the Harding Formation (Ordovician) of Colorado. Journal of Paleontology 26:641-644"	1
3841	"Amsden, T. W. and A. K. Miller. 1942. Ordovician Conodonts from the Bighorn Mountains of Wyoming. Journal of Paleontology 16:301-306"	1
3843	"Kolata, D. R. 1976. Crinoids from the Upper Ordovician Bighorn Formation of Wyoming. Journal of Paleontology 50:444-453"	1
3941	"Howe, H. J. 1967. Rhynchonellacea From the Montoya Group (Ordovician) of Trans-Pecos Texas. Journal of Paleontology 41:845-860"	1
3942	"Rigby, J. K. and P. Jamison. 1994. Lithistid Sponges from the Late Ordovician Fish Haven Dolomite, Bear River Range, Cache County, Utah. Journal of Paleontology 68:722-725"	1
3944	"Sweet, W. C. 2000. Conodonts and Biostratigraphy of Upper Ordivician Strata Along a Shelf to Basin Transect in Central Nevada. Journal of Paleontology 74:1148-1160"	3
3953	"Howe, H. J. and A. Reso. 1967. Upper Ordovician Brachiopods from the Ely Springs Dolomite in Southeastern Nevada. Journal of Paleontology 41:351-363"	1
3965	"Cressman, E. R. 1973. Lithostratigraphy and depositional environments of the Lexington Limestone (Ordovician) of central kentucky. USGS Professional Paper 768:1-61"	32
3996	"Alberstadt, L. P. 1973. Articulate brachiopods of the Viola Formation (Ordovician) in the ARbuckle Mountains, Oklahoma. Oklahoma Geological Survey Bulletin 117:1-90"	13
3998	"Sloan, R. E. and D. R. Kolata. 1987. The Middle and Late Ordovician strata and fossils of southeastern Minnesota. In . Minnesota Geological Survey, University of Minnesota Guidebook Series 70-96"	1
4017	"Sloan, R. E. ,W.F. Rice, E. Hedblom, J.M. Mazzullo. 1987. The Middle Ordovician Fossils of the Twin Cities, Minnesota. In . Minnesota Geological Survey, University of Minnesota, Guidebook Series no. 15 53-69"	1
4018	"Robson, S. P. and B. R. Pratt. 2001. Cambrian and Ordovician linguliform brachiopods from the Shallow Bay Formation (Cow Heard Group), Western Newfoundland. Journal of Paleontology 75:241-260"	2
4045	"Dean, W. T. 1989. Trilobites from the Survey Peak, Outram and Skoki Formations (Upper Cambrian-Lower Ordovician) at Wilcox Pass, Jasper National Park, Alberta). Geological Survey of Canada Bulletin :1-141"	2
4162	"Ayrton, W. G. ,W.B.N. Berry, A.J. Boucot, J. Lajoie, P.J. Lesperance, L. Pavlides, W.B. Skidmore. 1969. Lower Llandovery of the Northern Appalachians and Adjacent Regions. Geological Society of America Bulletin 80:459-484"	29
4171	"Sheehan, P. M. and P.J. Lesperance. 1981. Brachiopods from the White Head Formation (Late Ordovician-Early Silurian) of the Perce region, Quebec, Canada.  Unpublished data"	42
4231	"Lesperance, P. J. and P.M. Sheehan. 1976. Brachiopods from the Hirnantian Stage (Ordovician-Silurian) at Perce, Quebec. Paleontology 19:719-731"	1
4232	"Bolton, T. E. 1981. Early Silurian Anthozoa of Chaleurs Group, Port Daniel-Black Cape region, Gaspe Peninsula, Quebec. In . IUGS Subcommission on Silurian Stratigraphy, Ordovician - Silurian Boundary Working Group, Field Meeting, Anticosti - Gaspe, Quebec, 1981 299-314"	8
4246	"Lesperance, P. J. 1974. The Hirnantian fauna of the Perce area (Quebec) and the Ordovician-Silurian boundary. American Journal of Science 274:10-30"	2
4248	"Jin, J. ,W.G.E. Caldwell, B.S. Norford. 1989. Rhynchonellid Brachiopods from the Upper Ordovician - Lower Silurian Beaverfoot and Nonda Formations of the Rocky Mountains, British Columbia. Geological Survey of Canada, Bulletin 396:21-42"	2
4261	"Plotnick, R. E. 1999. Habitat of Llandoverian-Lochkovian eurypterids . In . in A. J. Boucot and J. D. Lawson, eds., Paleocommunities - a case study from the Silurian and Lower Devonian  106-136"	10
4294	"Brett, C. E. 1999. Wenlockian fossil communities in New York State and adjacent areas: Paleontology and Paleoecology. In A. J. Boucot, J. D. Lawson (eds.) . Paleocommunities: A Case Study from the Silurian and Lower Devonian 592-637"	17
4309	"Bolton, T. E. 1981. Late Ordovician and Early Anthozoa of Anticosti Island, Quebec. In . IUGS Subcommission on Silurian Stratigraphy, Ordovician - Silurian Boundary Working Group, Field Meeting, Anticosti - Gaspe, Quebec, 1981 107-109"	3
4161	"Watkins, R. 1994. Evolution of Silurian Pentamerid Communities in Wisconsin. Palaios 9:488-499"	19
4319	"Watkins, R. 1991. Guild structure and tiering in a high-diversity Silurian community, Milwaukee County, Wisconsin. Palaios 6:465-478"	10
4354	"Watkins, R. 1993. The Silurian (Wenlockian) reef fauna of Southeastern Wisconsin. Palaios 8:325-338"	4
4376	"Lespérance, P. J. 1968. Ordovician and Silurian trilobite faunas of the White Head Formation, Percé Region, Québec. Journal of Paleontology 42:811-826"	7
4379	"Frest, T. J. ,C. E. Brett, B. J. Witzke. 1999. Caradocian-Gedinnian echinoderm associations of Central and Eastern North America. In . Paleocommunities--a case study from the Silurian and Lower Devonian 638-783"	63
4385	"Laub, R. S. 1979. The corals of the Brassfield Formation (mid-Llandovery, Lower Silurian) in the Cincinnati Arch Region. Bulletins of American Paleontology 75:1-457"	33
6108	"Carter, C. 1972. Ordovician (Upper Caradocian) Graptolites from Idaho and Nevada. Journal of Paleontology 46:43-49"	2
6112	"Macomber, R. W. 1970. Articulate Brachiopods from the Upper Bighorn Formation (Late Ordovician) of Wyoming. Journal of Paleontology 44:416-450"	2
6114	"Renz, G. W. 1990. Late Ordovician (Caradocian) radiolarians from Nevada. Micropaleontology 36:367-377"	1
6130	"Rohr, D. M. and E. L. Yochelson. 1990. An unusual new Bellerophontacean Gastropod from the Ordovician (Whiterockian) of Nevada. Journal of Paleontology 64:956-960"	1
6140	"Nelson, S. J. 1963. Ordovician paleontology of the Northern Hudson Bay lowland. In . Geological Society of America Memoir 1-152"	17
6153	"Rohr, D. M. and R. A. Johns. 1990. First occurence of Oriostoma (Gastropoda) from the Middle Ordovician. Journal of Paleontology 64:732-735"	3
6152	"Rohr, D. M. 1996. Ordovician (Whiterockian) gastropods of Nevada, Part 2. Journal of Paleontology 70:56-63"	4
6334	"Schopf, J. M. ,E. Mencher, A. M. Boucot, H. N. Andrews. 1966. Erect Plants in the Early Silurian of Maine. Geological Survey Research 550D:D69-C75"	1
6573	"Hewitt, M.C. and R. J. Cuffey. 1985. Lichenaliid-Fistuliporoid crust-mounds (Silurian, New York-Ontario), typical early Paleozoic bryozoan reefs. Proceedings of the Fifth International Coral Reef Congress, Tahiti 6:-"	1
6575	"Archer, A. W. ,D.J. Bottjer, Horrowitz A.S., Kelly S.M., Krisher D.L. & Shaver R.H. 1980. Stratigraphy, structure, and zonation of large Silurian reef at Delphi, Indiana. AAPG Bulletin 64:115-131"	1
6608	"Copper, P. and D. J. Grawbarger. 1978. Paleoecological succession leading to a late Ordovician biostrome on Manitoulin Island, Ontario. Canadian Journal of Earth Sciences 15:1987-2005"	12
6611	"Schneider, K. A. and W. I. Ausich. 2002. Paleoecology of framebuilders in Early Silurian reefs (Brassfield Formation, southwestern Ohio). Palaios 17:237-248"	2
6632	"Thomas, A. T. and P. D. Lane. 1999. Trilobite assemblages of the North Atlantic Region. In . in A. J. Boucot and J. D. Lawson, eds. Paleocommunities--a case study from the Silurian and Lower Devonian. Cambridge University Press, Cambrdige 444-457."	3
6637	"Sloan, R. E. 1987. The St. Peter Sandstone of Southeastern Minnesota: Fauna. In . Middle and Late Ordovician Lithostratigraphy and Biostratigraphy of the Upper Mississippi Valley: Minnesota Geological Survey Report of Investigations 35 50-51"	5
6644	"Sloan, R. E. and D. A. DesAutels. 1987. The Wagner Quarry cystoid bed: a study in Prosser (Sherwood) paleoecology. Middle and Late Ordovician lithostratigraphy and biostratigraphy of the Upper Mississippi Valley: Minnesota Geological Survey Report of Investigations 35 :60-62"	1
6643	"DeMott, L. L. 1987. Platteville and Decorah Trilobites from Illinois and Wisconsin. Middle and Late Ordovician lithostratigraphy and biostratigraphy of the Upper Mississippi Valley: Minnesota Geological Survey Report of Investigations 35 :-"	7
6655	"Swain, F. M. and J. R. Cornell. 1987. Ostracoda of the superfamilies Drepanellacea, Hollinacea, Leperditellacea, and Healdiacea from the Decorah Shale of Minnesota. Middle and Late Ordovician lithostratigraphy and biostratigraphy of the Upper Mississippi Valley: Minnesota Geological Survey Report of Investigations 35 :102-130"	3
6656	"Swain, F. M. 1987. Middle and Upper Ordovician Ostracoda of Minnesota and Iowa. Middle and Late Ordovician lithostratigraphy and biostratigraphy of the Upper Mississippi Valley: Minnesota Geological Survey Report of Investigations 35  :99-101"	23
6686	"Rice, W. F. and E. P. Hedblom. 1987. Brachiopods and trilobites of the Sardeson Beds in the Twin Cities. Middle and Late Ordovician lithostratigraphy and biostratigraphy of the Upper Mississippi Valley: Minnesota Geological Survey Report of Investigations 35 :131-135"	11
6689	"Rice, W. F. 1987. The systematics and biostratigraphy of the Brachiopoda of the Decorah Shale at St. Paul, Minnesota. Middle and Late Ordovician lithostratigraphy and biostratigraphy of the Upper Mississippi Valley: Minnesota Geological Survey Report of Investigations 35 :136-166"	1
6690	"Sweet, W. C. 1987. Distribution and significance of conodonts in Middle and Upper Ordovician strata of the Upper Mississippi Valley region. Middle and Late Ordovician lithostratigraphy and biostratigraphy of the Upper Mississippi Valley: Minnesota Geological Survey Report of Investigations 35 :167-172"	1
6692	"Karklins, O. L. 1987. Bryozoa from Rocklandian (Middle Ordovician) rocks of the Upper Mississippi Valley region. Middle and Late Ordovician lithostratigraphy and biostratigraphy of the Upper Mississippi Valley: Minnesota Geological Survey Report of Investigations 35 :173-176"	18
6705	"Brower, J. C. 1987. The Middle Ordovician crinoid fauna of the Twin Cities area. Middle and Late Ordovician lithostratigraphy and biostratigraphy of the Upper Mississippi Valley: Minnesota Geological Survey Report of Investigations 35 :177-178"	4
6707	"Kolata, D. R. ,J. C. Brower, T. J. Frest. 1987. Upper Mississippi Valley Champlainian and Cincinnatian echinoderms. Middle and Late Ordovician lithostratigraphy and biostratigraphy of the Upper Mississippi Valley: Minnesota Geological Survey Report of Investigations 35 :179-181"	34
6733	"Pojeta, Jr., J. 1987. Ordovician pelecypods from the Upper Mississippi Valley. Middle and Late Ordovician lithostratigraphy and biostratigraphy of the Upper Mississippi Valley: Minnesota Geological Survey Report of Investigations 35 :182-182"	6
6737	"Sloan, R. E. and G. F. Webers. 1987. Stratigraphic ranges of Middle and Late Ordovician Gastropoda and Monoplacophora of Minnesota. Middle and Late Ordovician lithostratigraphy and biostratigraphy of the Upper Mississippi Valley: Minnesota Geological Survey Report of Investigations 35 :183-186"	34
6752	"Catalani, J. A. 1987. Biostratigraphy of the Middle and Late Ordovician cephalopods of the Upper Mississippi Valley area. Middle and Late Ordovician lithostratigraphy and biostratigraphy of the Upper Mississippi Valley: Minnesota Geological Survey Report of Investigations 35 :187-189"	60
6767	"Fay, R. O. and A. A. Graffham. 1982. Biostratigraphic and paleontological studies. Echinoderm faunas from the Bromide Formation (Middle Ordovician) of Oklahoma: Lawrence, Kansas, University of Kansas Paleontological Institute Monograph 11 :30-33"	13
6790	"Fay, R. O. ,A. A. Graffham, J. Sprinkle. 1982. Previous studies of Bromide echinoderms. Echinoderm faunas from the Bromide Formation (Middle Ordovician) of Oklahoma: Lawrence, Kansas, University of Kansas Paleontological Institute Monograph 11 :34-44"	3
6800	"Browne, R. G. 1964. The coral horizons and stratigraphy of the upper Richmond Group in Kentucky west of the Cincinnati Arch. Journal of Paleontology 38:385-392"	3
6816	"Sprinkle, J. 1982. Echinoderm zones and faunas. Echinoderm faunas from the Bromide Formation (Middle Ordovician) of Oklahoma: Lawrence, Kansas, University of Kansas Paleontological Institute Monograph 11 :46-56"	5
6817	"Miller, A. K. ,W. Youngquist, C. Collinson. 1954. Ordovician cephalopod fauna of Baffin Island. Geological Society of America Memoir 62:1-234"	8
6866	"Barnes, C. R. ,A. A. Petryk, T. E. Bolton. 1981. Anticosti Island, Québec. In . Field meeting, Anticosti-Gaspé, Québec, 1981: IUGS Subcommssion on Silurian Stratigraphy, Ordovician-Silurian Boundary Working Group Guidebook 1-24"	46
6890	"Skidmore, W. B. and P. J. Lespérance. 1981. Gaspé Peninsula, Percé area. In . Field meeting, Anticosti-Gaspé, Québec, 1981: IUGS Subcommssion on Silurian Stratigraphy, Ordovician-Silurian Boundary Working Group Guidebook  31-40"	13
6900	"Bourque, P. A. 1981. Gaspé Peninsula, Baie des Chaleurs area. In . Field meeting, Anticosti-Gaspé, Québec, 1981: IUGS Subcommssion on Silurian Stratigraphy, Ordovician-Silurian Boundary Working Group Guidebook 42-53"	7
6910	"McCracken, A. D. and C. R. Barnes. 1981. Conodont biostratigraphy across the Ordovician-Silurian boundary, Ellis Bay Formation, Anticosti Island, Québec. In . Field meeting, Anticosti-Gaspé, Québec, 1981: IUGS Subcommssion on Silurian Stratigraphy, Ordovician-Silurian Boundary Working Group, Stratigraphy and Paleontology 61-69"	7
6914	"Duffield, S. L. and J. A. LeGault. 1981. Acritarch biostratigraphy of Upper Ordovician-Lower Silurian rocks, Anticosti Island, Québec: Preliminary results. In . Field meeting, Anticosti-Gaspé, Québec, 1981: IUGS Subcommssion on Silurian Stratigraphy, Ordovician-Silurian Boundary Working Group, Stratigraphy and Paleontology 91-99"	1
6916	"Copper, P. 1981. Atrypoid brachiopods and their distribution in the Ordovician-Silurian sequence of Anticosti Island. In . Field meeting, Anticosti-Gaspé, Québec, 1981: IUGS Subcommssion on Silurian Stratigraphy, Ordovician-Silurian Boundary Working Group, Stratigraphy and Paleontology 137-141"	11
6922	"Riva, J. and A. A. Petryk. 1981. Graptolites from the Upper Ordovician and Lower Silurian of Anticosti Island and the position of the Ordovician-Silurian boundary. In . Field meeting, Anticosti-Gaspé, Québec, 1981: IUGS Subcommssion on Silurian Stratigraphy, Ordovician-Silurian Boundary Working Group, Stratigraphy and Paleontology 159-164"	28
6928	"Ludvigsen, R. 1979. A trilobite zonation of Middle Ordovician rocks, southwestern District of Mackenzie. In . Geological Survey of Canada Bulletin 1-99"	5
6948	"Boucot, A. J. 1999. Some Wenlockian-Geddinian, chiefly brachiopod dominated communities of North America. In A. J. Boucot and J. D. Lawson (eds.) . Paleocommunities--a case study from the Silurian and Lower Devonian 549-591"	6
6965	"Nowlan, G. S. 1981. Late Ordovician - Early Silurian conodont biostratigraphy of the Gaspé Peninsula - a preliminary report. In . Field meeting, Anticosti-Gaspé, Québec, 1981: IUGS Subcommssion on Silurian Stratigraphy, Ordovician-Silurian Boundary Working Group Guidebook 257-291"	19
6949	"Sheehan, P. M. 1980. Paleogeography and marine communities of the Silurian carbonate shelf in Utah and Nevada. In . in T. D. Fouch and E. R. Magathan, eds. Paleozoic paleogeography of west-central United States. Rocky Mountain Section, SEPM 19-37"	2
6991	"Lenz, A. C. 1999. Wenlockian to Pragian brachiopod communities of the northern Canadian Cordillera. In A. J. Boucot and J. D. Lawson (eds.) . Paleocommunities--a case study from the Silurian and Lower Devonian 784-792"	5
7003	"Mikulic, D. G. 1999. Silurian trilobite associations in North America. In A. J. Boucot and J. D. Lawson (eds.) . Paleocommunities--a case study from the Silurian and Lower Devonian 793-798"	10
7004	"Mikulic, D. G. 1981. Trilobites in Paleozoic carbonate buildups. Lethaia 14:45-56"	2
7006	"Witzke, B. J. and M. E. Johnson. 1999. Silurian brachiopod and related benthic communities from carbonate platform and mound environments of Iowa and surrounding areas. In A. J. Boucot and J. D. Lawson (eds.) . Paleocommunities--a case study from the Silurian and Lower Devonian 806-840"	23
7044	"Riva, J. 1981. Graptolites from the Matapédia and Honorat Groups of Gaspé. In . Field meeting, Anticosti-Gaspé, Québec, 1981: IUGS Subcommssion on Silurian Stratigraphy, Ordovician-Silurian Boundary Working Group Guidebook 293-298"	3
7051	"Boucot, A. J. and P. A. Bourque. 1981. Brachiopod biostratigraphy of the Llandoverian rocks of the Gaspé Peninsula. Field meeting, Anticosti-Gaspé, Québec, 1981: IUGS Subcommssion on Silurian Stratigraphy, Ordovician-Silurian Boundary Working Group Guidebook 2:315-321"	10
7064	"Jackson, D. E. 1966. On the occurrence of Parabrograptus and Sinograptus from the Middle Ordovician of western Canada. Geological Magazine 103:263-268"	2
34691	"Tremblay, J. V. and S. R. Westrop. 1991. Middle Ordovician (Whiterockian) trilobites from the Sunblood Formation, District of Mackenzie, Canada. Journal of Paleontology 65:801-824"	25
7065	"Ludvigsen, R. 1976. New cheirurinid trilobites from the lower Whittaker Formation (Ordovician), southern Mackenzie Mountains. Canadian Journal of Earth Sciences 13:947-959"	2
7066	"Ludvigsen, R. and B. D. E. Chatterton. 1991. The peculiar Ordovician trilobite Hypodicranotus from the Whittaker Formation, District of Mackenzie. Canadian Journal of Earth Sciences 28:616-622"	2
7071	"Brunton, F. R. and P. Copper. 1994. Paleoecologic, temporal, and spatial analysis of Early Silurian reefs of the Chicotte Formation, Anticosti Island, Quebec, Canada. Facies 31:57-80"	4
7089	"Jackson, D. E. and A. C. Lenz. 1963. A new species of Monograptus from the Road River Formation, Yukon. Palaeontology 6:751-753"	2
7070	"Ludvigsen, R. 1975. Ordovician formations and faunas, southern Mackenzie Mountains. Canadian Journal of Earth Sciences 12:663-697"	24
7121	"Norford, B. S. 1963. Reconnaissance of the Ordovician and Silurian rocks of Northern Yukon Territory. Geological Survey of Canada Department of Mines and Technical Surveys, Paper 63-39 :1-139"	15
7191	"Copeland, M. J. 1974. Middle Ordovician ostracoda from southwestern District of Mackenzie. Canada Geological Survey Bulletin :1-55"	27
7192	"Peters, S. E. and K. B. Bork. 1999. Species-abundance models: an ecological approach to inferring paleoenvironment and resolving paleoecological change in the Waldron Shale (Silurian). Palaios 14:234-245"	3
7069	"Chatterton, B. D. E. and R. Ludvigsen. 1976. Silicified Middle Ordovician trilobites from the South Nahanni River Area, District of Mackenzie, Canada. Palaeontographica Abteilung A 154:1-106"	3
7197	"Adrain, J. M. and G. D. Edgecombe. 1997. Silurian encrinurine trilobites from the central Canadian Arctic. Palaeontographica Canadiana 14:1-38"	17
7199	"Adrain, J. M. and L. Ramskold. 1996. The lichid trilobite Radiolichas in the Silurian of Arctic Canada and Gotland, Sweden. Geological Magazine 133:147-158"	3
7200	"Adrain, J. M. and E. W. MacDonald. 1996. Phacopid trilobites from the Silurian of Arctic Canada. Journal of Paleontology 70:1091-1094"	1
7202	"Perry, D. G. and B. D. E. Chatterton. 1977. Silurian (Wenlockian) trilobites from Baillie-Hamilton Island, Canadian Arctic Archipelago. Canadian Journal of Earth Sciences 14:285-317"	5
7204	"Rohr, D. M. ,A.J. Boucot, D.G. Perry. 1981. Silurian (Wenlockian) gastropods from Baillie-Hamilton Island, Canadian Arctic. Journal of Paleontology 55:331-339"	1
7205	"Zhang, N. 1989. Wenlockian (Silurian) brachiopods of the Cape Phillips Formation, Baillie Hamilton Island, Arctic Canada: part I. Palaeontographica Abteilung A 206:49-97"	3
7208	"Holloway, D. J. 1980. Middle Silurian trilobites from Arkansas and Oklahoma, U.S.A. Palaeontographica Abteilung A 170:1-85"	2
7210	"Amsden, T. W. 1968. Articulate brachiopods of the St. Clair Limestone (Silurian), Arkansas and the Clarita Formation (Silurian), Oklahoma. Paleontological Society Memoir 1:1-117"	4
7215	"Chatterton, B. D. E. and D. G. Perry. 1983. Silicified Silurian odontopleurid trilobites from the Mackenzie Mountains. Palaeontographica Canadiana 1:1-55"	19
7219	"Perry, D. G. and B. D. E. Chatterton. 1979. Wenlock trilobites and brachiopods from the Mackenzie Mountains, north-western Canada. Palaeontology 22:569-607"	2
7218	"Jin, J. and B. D. E. Chatterton. 1997. Latest Ordovician-Silurian articulate brachiopods and biostratigraphy of the Avalanche Lake area, southwestern District of Mackenzie, Canada. Palaeontographica Canadiana 13:1-62"	3
7224	"McCracken, A. D. and G. S. Nowlan. 1989. Conodont paleontology and biostratigraphy of Ordovician carbonates and petroliferous carbonates on Southampton, Baffin, and Akpatok islands in the eastern Canadian Arctic. Canadian Journal of Earth Sciences 26:1880-1903"	7
7251	"Liberty, B. A. 1969. Palaeozoic geology of the Lake Simcoe Area, Ontario. Geological Survey of Canada Memoirs :1-201"	22
7267	"Hussey, R. C. 1926. The Richmond Formation of Michigan. Michigan University Contributions from the Museum of Geology 2:113-188"	14
7268	"Ruedemann, R. and G. M. Ehlers. 1924. Occurrence of the Collingwood Formation in Michigan. Michigan University Contributions from the Museum of Geology 2:13-18"	3
7270	"Stearn, C. W. 1956. Stratigraphy and palaeontology of the Interlake Group and Stonewall Formation of Southern Manitoba. Geological Survey of Canada Memoir 281:1-162"	76
7507	"Bolton, T. E. 1988. Stromatoporoidea from the Ordovician rocks of central and eastern Canada. Contributions to Canadian paleontology, Geological Survey of Canada Bulletin 379:17-45"	20
7524	"Buttler, C. J. ,R. J. Elias, B. S. Norford. 1988. Upper Ordovician to lowermost Silurian solitary rugose corals from the Beaverfoot Formation, southern Rocky Mountains, British Columbia and Alberta. Contributions to Canadian paleontology, Geological Survey of Canada Bulletin 379:47-91"	40
7567	"Stait, B. 1988. Nautiloids of the Lourdes Formation (Middle Ordovician), Port au Port Peninsula, western Newfoundland. New Mexico Bureau of Mines and Mineral Resources Memoir 44:61-77"	14
7571	"Frey, R. C. 1988. Paleoecology of Treptoceras duseri (Michelinoceratida, Proteoceratidae) from Late Ordovician of southwestern Ohio. New Mexico Bureau of Mines and Mineral Resources Memoir 44:79-101"	4
7673	"Elias, R. J. and D. Lee. 1993. Microborings and growth in Late Ordovician halysitids and other corals. Journal of Paleontology 67:922-934"	18
7694	"Sheehan, P. M. and P. J. Lespérance. 1979. Late Ordovician (Ashgillian) brachiopods from the Percé region of Québec. Journal of Paleontology 53:950-967"	2
7399	"Elias, R. J. 1983. Late Ordovician solitary rugose corals of the Stony Mountain Formation, southern Manitoba, and its equivalents. Journal of Paleontology 57:924-956"	26
8880	"Cooper, B. N. and C. E. Prouty. 1943. Stratigraphy of the Lower Middle Ordovician of Tazewell County, Virginia. Bulletin of the Geological Society of America 54:819-886"	119
9146	"Glass, A. ,W. I. Ausich, P. Copper. 2003. New cyclocystoid (phylum echinodermata) from Anticosti Island, Quebec, and its bearing on cyclocystoid life modes. Journal of Paleontology 77:949-957"	1
9217	"McKinney, F. K. ,F. Webb, Jr., M. J. McKinney. 2001. Middle Ordovician infratidal bryozoan-dominated microreefs (Bowen Formation, southwestern Virginia, USA). Memorie di Scienze Geologiche 53:125-137"	1
9295	"Jin, J. and R. Zhan. 2000. Evolution of the Late Ordovician orthid brachiopod Gnamptorhynchos Jin, 1989 from Platystrophia King, 1850, in North America. Journal of Paleontology 74:983-991"	1
9363	"Lehman, D. and J.K. Pope. 1990. Upper Ordovician tempestites from Swatara Gap, Pennsylvania: depositional processes affecting the sediments and paleoecology of the fossil faunas. Palaios 4:553-564"	1
9375	"Saint Louis Diekmeyer, S. C. 1998. Kope to Bellevue formations; the Riedlin Road/Mason Road site (Upper Ordovician, Cincinnati, Ohio, region). In . Guidebook - State of Ohio, Department of Natural Resources, Division of Geological Survey, Report 10-35"	1
9516	"Howe, H. J. 1966. The brachiopod genus Lepidocyclus fromthe Cape (Fernvale) Limestone (Ordovician) of Oklahoma and Missouri. Journal of Paleontology 40:258-268"	1
9514	"Holland, S. M. 2003. Unpublished field notes.  Unpublished data"	2
9969	"Goldman, D. 1995. Taxonomy, evolution, and biostratigraphy of the Orthograptus quadrimucronatus species group (Ordovician, Graptolithina). Journal of Paleontology 69:516-540"	1
9970	"Marintsch, E. J. 1998. Systematic paleontology, biostratigraphy, and paleoecology of Middle Ordovician Bryozoa (Trepostomata) from the Hermitage Formation of east-central Tennessee. Bulletins of American Paleontology 112:1-121"	4
10032	"Fortey, R. A. and M.L. Droser. 1996. Trilobites at the base of the Middle Ordovician, western United States. Journal of Paleontology 70:73-991"	35
10038	"Foerste, A. F. 1936. Cephalopods from the Upper Ordovician of Perce, Quebec. Journal of Paleontology 10:373-384"	1
10044	"Cooper, G. A. and C.H. Kindle. 1936. New brachiopods and trilobites from the Ordovician of Perce, Quebec. Journal of Paleontology 10:348-372"	11
10094	"Beecher, C. E. 1889. Brachiospongidae: a memoir on a group of Silurian sponges. Memoirs of the Peabody Museum of Yale University 2:1-28"	1
10106	"Bassler, R. S. 1950. New genera of American Middle Ordovician ""Cystoidea"". Journal of the Washington Academy of Sciences 40:273-277"	7
10968	"Woodward, H. P. 1941. Silurian System of West Virginia. West Virginia Geological Survey 14:1-326"	55
11371	"Ruedemann, R. 1906. Cephalopoda of the Beekmantown and Chazy formations of the Champlain Basin. Bulletin of the New York State Museum, Paleontology 14:389-611"	6
11775	"Desrochers, A. and N. P. James. 1989. Middle Ordovician (Chazyan) bioherms and biostromes of the Mingan Islands, Quebec. In H. H. J. Geldsetzer, N. P. James, and G. E. Tebbutt (eds.) . Reefs, Canada and adjacent areas. Canadian Soc. Petrol. Geologists, Memoir 183-191"	1
11778	"James, N. P. and C. F. Klappa. 1989. Lithistid sponge bioherms, early Middle Ordovician, western Newfoundland. In H. H. J. Geldsetzer, N. P. James, and G. E. Tebbutt (eds.) . Reefs, Canada and adjacent areas. Canadian Soc. Petrol. Geologists, Memoir 196-200"	1
11780	"Pratt, B. R. 1989. Small early Middle Ordovician patch reefs, Laval Formation (Chazy Group), Caughnawaga, Montreal area, Quebec. In H. H. J. Geldsetzer, N. P. James, and G. E. Tebbutt (eds.) . Reefs, Canada and adjacent areas. Canadian Soc. Petrol. Geologists, Memoir 218-223"	1
11781	"Cuffey, R. J. 1989. Lock Haven coral-bryozoan reef, Middle Silurian, Pennsylvania. In H. H. J. Geldsetzer, N. P. James, and G. E. Tebbutt (eds.) . Reefs, Canada and adjacent areas. Canadian Soc. Petrol. Geologists, Memoir 285-287"	1
11782	"Cuffey, R. J. and P. Copper. 1989. Honora Bay bryozoan bioherms, Lower Silurian, Manitoulin Island, Ontario. In H. H. J. Geldsetzer, N. P. James, and G. E. Tebbutt (eds.) . Reefs, Canada and adjacent areas. Canadian Soc. Petrol. Geologists, Memoir 290-292"	1
11785	"Inners, J. D. 1989. Favositid patch reef, Early Silurian, Allenwood, Pennsylvania. U.S.A.. In H. H. J. Geldsetzer, N. P. James, and G. E. Tebbutt (eds.) . Reefs, Canada and adjacent areas. Canadian Soc. Petrol. Geologists, Memoir 316-318"	1
9838	"Holland, S. M. and M.E. Patzkowsky. 2004. Ecosystem structure and stability: middle Upper Ordovician of central Kentucky, USA.. Palaios 19:-"	93
13388	"Poulsen, C. 1974. Silurian Pelecypoda, Monoplacophora and Gastropoda from the reefy facies of the Offley Island Formation of Washington Land and Offley Island (Northwest Greenland). Det Kongelige Danske Videnskabernes Selskab Biolgiske Skrifter 20:1-17"	3
11499	"Peel, J. S. 1984. Autecology and systematics of a new Silurian anomphalid gastropod from western Greenland. Rapport Grønlands Geologiske Undersøgelse 121:77-87"	2
13546	"Kreisa, R. D. 1980. Virginia Polytechnic Institute and State University. In .  1-355"	48
13695	"Sheehan, P. M. 1980. The Late Ordovician and Silurian of the Eastern Great Basin, Part 3. Brachiopods of the Tony Grove Lake Member of the Laketown Dolomite. Milwaukee Public Museum Contributions in Biology and Geology 30:1-23"	12
13700	"Sheehan, P. M. 1982. Late Ordovician and Silurian of the eastern Great Basin Part 4. Late Llandovery and Wenlock brachiopods. Milwaukee Public Museum Contributions in Biology and Geology 50:1-73"	21
13544	"Peters, SE 2003. The University of Chicago. In . EVENNESS, RICHNESS AND THE CAMBRIAN-PALEOZOIC FAUNAL TRANSITION IN NORTH AMERICA:AN ASSEMBLAGE-LEVEL PERSPECTIVE  1-279 "	
14697	"Brett, K.D. and S.R. Westrop. 1996. Trilobites of the Lower Ordovician (Ibexian) For Cassin Formation, Champlain Valley Region, New York State and Vermont. Journal of Paleontology 70:408-427"	3
14962	"Byers, C. W. and S Gavlin. 1979. Two contemporaneous equilibrium communities in the Ordovician of Wisconsin. Lethaia 12:297-305"	2
15106	"Bolton, T. E. 1970. Subsurface Ordovician fuana, Anticosti Island, Quebec. Geological Survey of Canada, Bulletin 187:1-145"	2
15127	"Rohr, D. M. ,W.D. Boyce, I. Knight. 2003. Ordovician gastropods from Western Newfoundland. Current Research (2003) Newfoundland Department of Mines and Energy Geological Survey 2003:127-136"	1
15148	"Twenhofel, W. H. 1938. Geology and paleontology of the Mingan Islands, Quebec. Geological Society of America Special Paper 11:1-123"	4
15149	"Raymond, P. E. 1906. The Chazy Formation and its fauna. Annals of the Carnegie Museum 3:498-596"	6
15211	"Lewis, R. D. and E. L. Yochelson. 1978. Palliseria robusta Wilson (Gastropoda) in Oil Creek Formation, Arbuckle Mountains, Oklahoma. Oklahoma Geology Notes 38:43-48"	1
15212	"Rohr, D. M. ,B.S. Norford, E.L. Yochelson. 1995. Stratigraphically significant Early and Middle Ordovician gastropod occurrences, Western and Northwestern Canada. Journal of Paleontology 69:1047-1053"	4
17713	"Steele-Petrovich, H. M. and T. E. Bolton. 1998. Morphology and palaeoecology of a primitive mound-forming tubicolous Polychaete from the Ordovician of the Ottawa Valley, Canada. Palaeontology 41:125-145"	3
17785	"Kobluk, D. R. and I. Noor. 1990. Coral microatolls and a probable Middle Ordovician example. Journal of Paleontology 64:39-43"	1
18202	"Kapp, U. S. 1975. Paleoecology of Middle Ordovician stromatoporoid mounds in Vermont. Lethaia 8:195-207"	1
18204	"Kapp, U. S. and C. W. Stearn. 1975. Stromatoporoids of the Chazy Group (Middle Ordovician), Lake Champlain, Vermont and New York. Journal of Paleontology 49:163-186"	9
18214	"Branson, C. C. 1966. Conocardium in the Bromide Formation (Ordovician) of Oklahoma. Oklahoma Geology Notes 25:78-79"	1
11416	"Twenhofel, W. H. 1928. Geology of Anticosti Island. Geological Survey of Canada Memoir 154:1-351"	3
32814	"Soufiane, A. and A. Achab. 2000. Chitinozoan zonation of the Late Ordovician and the Early Silurian of the island of Anticosti, Québec, Canada. Review of Palaeobotany and Palynology 109:85-101"	3
11456	"Wilson, A. E. 1951. Gastropoda and Conularida of the Ottawa Formation of the Ottawa - St. Lawrence Lowland. Geological Survey of Canada Bulletin 17:1-149"	1
18511	"Yochelson, E. L. 1994. Macroscenella (Mollusca) from the Middle Ordovician of Wisconsin - a reinterpretation and reassignment. Journal of Paleontology 68:1252-1256"	2
18187	"Novack-Gottshall, P. M. 1999. Comparative geographic and environmental diversity dynamics of gastropods and bivalves during the Ordovician Radiation (M.S. thesis, University of Cincinnati). In .  1-191"	24
18634	"Sumrall, C. D. and F.J. Gahn. 2006. Morphological and systematic reinterpretation of two enigmatic edrioasteroids (Echinodermata) from Canada. Canadian Journal of Earth Sciences 43:497-507"	1
18639	"Lobdell, F.K. 1992. Arthrostylidae (Bryozoa: Cryptostomata) fromthe Gunn Member, Stony Mountain Formation (Upper Ordovician), North Dakota and Manitoba. North Dakota Geological Survey Miscellaneous Series 76:99-115"	6
16482	"Yochelson, E. L. , , . 1957. Notes on the gastropod Palliseria robusta Wilson. Journal of Paleontology 31:648-650"	1
18625	"Palmer, A.R. 1968. Cambrian trilobites of East-Central Alaska. United States Geological Survey Professional Paper 559:-"	6
18739	"Elias, R. J. 1985. Solitary rugose corals of the Upper Ordovician Montoya Group, Southern New Mexico and Westernmost Texas. Journal of Paleontology Memoir 59:1-58"	15
18793	"Gierlowski, T.C. and R. L. Langenheim, Jr.. 1985. Corals from the Late Ordovician Horseshoe Mountain Member, Bighorn Dolomite, Bighorn Mountains, Sheridan County, Wyoming. Wyoming Geological Association Earth Science Bulletin 18:1-21"	2
18941	"Rigby, J. K. and A. Desrochers. 1995. Lower and Middle Ordovician lithistid demosponges from the Mingan Islands, Gulf of St. Lawrence, Quebec, Canada. Journal of Paleontology Memoir 69:1-35"	5
15770	"Boucot, A. J. ,J. G. Johnson, C. Harper, V.G. Walmsley. 1967. Silurian brachiopods and gastropods of southern New Brunswick. Geological Survey of Canada Bulletin 140:1-45"	1
16254	"Peel, J. S. , , . 1991. Salpingostomatiform and related bellerophontacean gastropods from Greenland and the Baltic region. Grønlands Geologiske Undersøgelse Bulletin 161:67-116"	3
7230	"Edgecombe, G. D. 1994. New Lower Silurian (Llandovery) encrinurine trilobites from the Mackenzie Mountains, Canada. Journal of Paleontology 68:824-837"	6
24429	"Holland, S. M. and M.E. Patzkowsky. 2007. Gradient ecology of a biotic invasion: biofacies of the type Cincinnatian Series (Upper Ordovician), Cincinnati, Ohio region, USA. Palaios 22:408-423"	694
24602	"Smith, A. B. and J.J. Savill. 2001. Bromidechinus, a new Ordovician echinozoan (Echinodermata), and its bearing on the early history of echinoids. Transactions of the Royal Society of Edinburgh 92:137-147"	1
24623	"Whittington, H. B. and W.R., II Evitt. 1953. Silicified Middled Ordovician trilobites. Geological Society of America Memoir 59:1-139"	6
24640	"Cooper, B. N. 1953. Trilobites from the Lower Champlainian formations of the Appalachian Valley. Geological Society of America Memoir 55:1-69"	2
24916	"Bulinski, K.V. 2007. Analysis of sample-level properties along a paleoenvironmental gradient: the behavior of evenness as a function of sample size. Palaeogeography, Palaeoclimatology, Palaeoecology 243:490-508"	140
25360	"Klingensmith, B. C. 2007. GIS-based biogeography of Cincinnatian (Upper Ordovician) brachiopods with special reference to Hebertella. In .  -"	268
25391	"Boucot, A. J. and J. G. Johnson. 1970. Redescription of Clintonella Hall (Silurian, Brachiopoda). Journal of Paleontology 44:893-897"	1
20376	"Brett, C. E. , , . 1978. Description and plaeoecology of a new Lower Silurian camerate crinoid. Journal of Paleontology 52:91-103"	2
25397	"Cameron, B. 1967. Oldest Carnivorous Gastropod Borings, Found in Trentonian (Middle Ordovician) Brachiopods. Journal of Paleontology 41:147-150"	2
20379	"Brett, C. E. , , . 1981. Systematics and paleoecology of Late Silurian (Wenlockian) calceocrinid crinoids from New York and Ontario. Journal of Paleontology 55:145-175"	7
25406	"Perry, T.G. and D.E. Hattin. 1960. Osgood (Niagaran) bryozoans from the type area. Journal of Paleontology 34:85-90"	1
15908	"Fix, M. F. , , . 1975. The Paleontology and stratigraphy of the Smithville and Blackrock Formations of Southeastern Missouri. In . M.S. Thesis, Geology, Washington University 1-147"	2
25598	"Sivon, P. A. 1980. Stratigraphy and paleontology of the Maquoketa Group (Upper Ordovician) at Wequiock Creek, Eastern Wisconsin. Milwaukee Public Museum Contributions in Biology and Geology 35:1-45"	1
25696	"Stumm, E.C. and E.G. Kauffman. 1958. Calymenid trilobites from the Ordovician rocks of Michigan. Journal of Paleontology 32:943-960"	7
25778	"Sheehan, P. M. and P.J. Lespérance. 1978. The occurrence of the Ordovician brachiopod Foliomena at Percé, Quebec. Canadian Journal of Earth Sciences 15:454-458"	1
28962	"Layou, K. M. 2009. Ecological restructuring after extinction: the Late Ordovician (Mohawkian) of the eastern United States. Palaios 24:118-128"	353
25788	"Titus, R. and B. Cameron. 1976. Fossil communities of the lower Trenton Group (Middle Ordovician) of central and northwestern New York State. Journal of Paleontology 50:1209-1225"	5
25792	"Walker, K. R. and W.W. Diehl. 1985. Upper Ordovician “Martinsburg” Formation, a deep-water to shallow-water sequence. Studies in Geology (Knoxville) :86-92 "	1
20755	"Eckert, J. D. , , . 1990. The Early Silurian myelodactylid crinoid Eomyelodactylus Foerste. Journal of Paleontology 64:135-141"	5
25807	"Cooper, B.N. and G. A. Cooper. 1946. Lower Middle Ordovician stratigraphy of the Shenandoah Valley, Virginia. Geological Society America Bulletin :35-113"	5
25810	"Fisher, D. W. 1951. A New Edrioasteroid from the Middle Ordovician of New York. Journal of Paleontology 25:691-693"	1
25846	"Racheboeuf, P.R. and Amos F.C.. 1997. Revision and Reassignment of Strophomena cornuta Hall, 1843 (Brachiopoda, Silurian) to Strophochonetes Muir-Wood, 1962. Journal of Paleontology 71:816-819"	2
25968	"Rickard, L.V. and D.H. Zenger. 1964. Stratigraphy and Paleontology of the Richfield Springs and Cooperstown Quadrangles, New York. Bulletin of the New York State Museum and Science Service 396:101-"	7
26003	"Pojeta, Jr., J. and C. A. Stott. 2007. Nucularcidae: a new family of palaeotaxodont Ordovician pelecypods (Mollusca) from North America and Australia. Canadian Journal of Earth Sciences 44:1479-1501"	3
10963	"Wahlman, G.P. 1992. Middle and Upper Ordovician symmetrical univalved molluscs (Monoplacophora and Bellerophontina) of the Cincinnati Arch region. United States Geological Survey Professional Paper 1066:1-123"	6
26081	"Eckert, B.Y. and C. E. Brett. 1989. Bathymetry and paleoecology of Silurian benthic assemblages, late Llandoverian, New York State. Palaeogeography, Palaeoclimatology, Palaeoecology 74:297-326"	5
26101	"Bretsky, P.W. 1970. Late Ordovician benthic communities in north-central New York. New York State Museum Bulletin :-"	1
25410	"Ross, Jr., J. 1964. Middle and Lower Ordovician Formations in Southernmost Nevada and Adjacent California. United States Geological Survey Bulletin 1180-C:-"	62
26121	"Merriam, C. W. 1963. Paleozoic rocks of Antelope Valley, Eureka and Nye Counties, Nevada . United States Geological Survey Professional Paper :-"	2
26139	"Bretsky, P.W. 1977. Macroinvertebrate teilzones and episodic faunal changes from an Upper Ordovician flysch in Quebec. Canadian Journal of Earth Sciences . Canadian Journal of Earth Sciences 14:1674-1686"	3
26165	"Suchy, D. R. and C. W. Stearn. 1992. Lower Silurian reefs and post-reef beds of the Attawapiskat Formation, Hudson Bay Platform, northern Ontario. Canadian Journal of Earth Sciences 30:575-590"	1
26166	"Jin, J. ,W. G. E. Caldwell, B. S. Norford. 1993. Early Silurian brachiopods and biostratigraphy of the Hudson Bay Lowlands, Manitoba, Ontario and Quebec. Bulletin Geological Survey of Canada 457:1-221"	17
26176	"Jin, J. 2003. The Early Silurian brachiopod Eocoelia from the Hudson Bay Basin, Canada. Palaeontology 46:885-902"	4
26177	"Jin, J. 2005. Reef-dwelling gypiduloid brachiopods in the Lower Silurian Attawapiskat Formation, Hudson Bay region. Journal of Paleontology 79:48-62"	1
26306	"Frey, R. C. 1980. Vanuxemia waynesvillensis, a new species of cyrtodontid pelecypod from the Upper Ordovician of southwest Ohio. Journal of Paleontology 54:740-744"	1
26322	"Ross, Jr., R. J. ,T.B. Nolan, A.G. Harris. 1980. The Upper Ordovician and Silurian Hanson Creek Formation of central Nevada. 1980 . United States Geological Survey Professional Paper :-"	4
26333	"Whittington, H. B. 1968. Zonation and correlation of Canadian and Early Mohawkian series. In . in E. Zen, ed., Studies of Appalachian geology, northern and marine 49-60"	8
26568	"Kobluk, D. R. ,D. J. Bottjer, M. J. Risk. 1977. Disorientation of Paleozoic hemispherical corals and stromatoporoids. Canadian Journal of Earth Sciences 14:2226-2231"	1
26569	"Copper, P. 1982. Early Silurian atrypoids from Manitoulin Island and Bruce Peninsula, Ontario. Journal of Paleontology 56:680-702"	2
26572	"Young, G. A. and J. P. A. Noble. 1990. Silurian tabulate coral biostratigraphy and biofacies of northern New Brunswick and the southern Gaspe Peninsula. Canadian Journal of Earth Sciences 27:1143-1158"	1
26607	"Soja, C. M. and R. Riding. 1993. Silurian microbial associations from the Alexander Terrane, Alaska. Journal of Paleontology 67:728-738"	4
26611	"Kahle, C. F. 1994. Facies and evolution of a Silurian coral-microbialite reef complex, Maumee, Ohio, USA. Journal of Sedimentary Research 64:711-725"	1
26896	"Stenzel, S. R. and N. P. James. 1995. Shallow-water stromatactis mud-mounds on a Middle Ordovician foreland basin platform, western Newfoundland. in C. L. V. Monty, D. W. J. Bosence, P. H. Bridges, B. R. Pratt, eds., Carbonate mud-mounds, Special Publication of the International Association of Sedimentologists 23:127-149"	1
26897	"Alberstadt, L. P. ,K. R. Walker, R. P. Zurawski. 1974. Patch reefs in the Carters Limestone (Middle Ordovician) in Tennessee, and vertical zonation in Ordovician reefs. Geological Society America Bulletin 85:1171-1182"	1
26898	"Kobluk, D. R. 1981. Cavity-dwelling biota in Middle Ordovician (Chazy) bryozoan mounds from Quebec. Canadian Journal of Earth Sciences 18:42-54"	1
25409	"Ross, Jr., R. J. 1972. Fossils from the Ordovician bioherm at Meiklejohn Peak, Nevada. United States Geological Survey Professional Paper 685:-"	23
26937	"Walker, K. R. and K. F. Ferrigno. 1973. Major Middle Ordovician reef tract in East Tennessee. American Journal of Science 273:294-325"	4
27115	"Ruppel, S. C. and K. R. Walker. 1982. Sedimentology and distinction of carbonate buildups: Middle Ordovician, east Tennessee. Journal of Sedimentary Petrology 52:1055-1071"	2
27117	"Stock, C. W. and D. J. Benson. 1982. Occurrence and distribution of fossils within and adjacent to Middle Ordovician bioherms in the southern Appalachians of Alabama. Proceedings of the North American Paleontological Convention 3:517-524"	1
27118	"Copper, P. 2001. Reefs during the multiple crises towards the Ordovician-Silurian boundary: Anticosti Island, eastern Canada, and worldwide. Canadian Journal of Earth Sciences 38:153-171"	3
27123	"Greggs, R. G. and M. W. Sargent. 1971. Algal bioherms of the upper Gull River Formation (Middle Ordovician) near Kingston, Ontario. Canadian Journal of Earth Sciences 8:1373-1381"	1
27124	"Flower, R. H. 1961. Montoya and related colonial corals. Memoir New Mexico State Bureau of Mines and Mineral Resources 7:3-97"	4
27141	"Werts, S. P. ,R. J. Cuffey, C. A. Cuffey. 2001. Bryozoan species in the Chickasaw bryozoan reef (Ordovician, Oklahoma). Abstracts with Programs - Geological Society of America 33:54-55"	1
27150	"Pohler, S. M. L. and N. P. James. 1989. Reconstruction of a Lower/Middle Ordovician carbonate shelf margin: Cow Head Group, western Newfoundland. Facies 21:189-262"	3
27251	"Debrenne, F. ,A. Gandin, R. A. Gangloff. 1990. Analyse sedimentologique et paleontologie de calcaires organogenes du Cambrien inferieur de Battle Mountain (Nevada, USA) [Sedimentology and paleontology of the Lower Cambrian organogenic limestones from Battle Mountain (Nevada, USA)]. Annales de Paleontologie 76:73-119"	2
27389	"Lespérance, P. J. 1988. Percé, Québec, Canada. Bulletin of the British Museum of Natural History (Geology) 43:239-245"	1
20440	"Brower, J. C. ,K.M. Kile, . 1994. Paleoautecology and ontogeny of Cupulocrinus levorsoni Kolata, a Middle Ordovician crinoid from the Guttenberg Formation of Wisconsin. New York State Museum Bulletin 481:25-44"	1
27610	"Gillette, T. 1947. The Clinton of Western and Central New York. New York State Museum Bulletin :-"	132
28469	"Ebbestad, J. O. R. and C. A. Scott. 2008. Failed predation in Late Ordovician gastropods (Mollusca) from Manitoulin Island, Ontario, Canada. Canadian Journal of Earth Sciences 45:231-241"	1
24575	"Frey, R. C. 1995. Middle and Upper Ordovician nautiloid cephalopods of the Cincinnati Arch region of Kentucky, Indiana, and Ohio. U.S. Geological Survey Professional Paper 1066P:1-126"	55
29768	"Flower, R. H. 1964. The Nautiloid Order Ellesmeroceratida (Cephalopoda). State Bureau of Mines and Mineral Resources, New Mexico Institute of Mining and Technology, Memoir 12:234 p.-"	2
29843	"Flower, R. H. 1952. New Ordovician Cephalopods from Eastern North America. Journal of Paleontology 26:24-59"	16
30019	"Frey, R. C. 1981. Narthecoceras (Cephalopoda) from the Upper Ordovician (Richmondian) of Southwest Ohio. Journal of Paleontology 55:1217-1224"	1
30173	"Kröger, B. and E. Landing. 2009. Cephalopods and Paleoenvironments of the Fort Cassin Formation (Upper Lower Ordovician), eastern New York and adjacent Vermont. Journal of Paleontology 83:664-693"	3
29491	"Blake, D. B. and F. R. Ettensohn. 2009. The complex morphology of a new Lower Silurian asteroid (Echinodermata). Journal of Paleontology 83:63-69"	1
30356	"Clark, D. L. ,J. K. Sorenson, A. N. Ladd. 1999. Probable Microvertebrates, Vertebrate-like Fossils, and Weird Things from the Wisconsin Ordovician. Journal of Paleontology 73:1201-1209"	2
30363	"Sansom, I. J. and D. K. Elliott. 2002. A thelodont from the Ordovician of Canada. Journal of Vertebrate Paleontology 22:867-870"	1
30373	"Darby, D. G. 1982. The early vertebrate Astraspis, habitat based on a lithologic association. Journal of Paleontology 56:1187-1196"	10
28540	"Blake, D. B. 2007. Two Late Ordovician asteroids (Echinodermata) with characters suggestive of early ophiuroids.. Journal of Paleontology 81:1476-1485"	1
24434	"Blake, D. B. and T. E. Guensburg. 1993. New Lower Ordovician stelleroids (Echinodermata) and their bearing on the origins and early history of the stelleroid echinoderms. Journal of Paleontology 67:103-113"	2
34231	"Rigby, J. K. ,A. W. Potter, R. B. Blodgett. 1988. Ordovician sphinctozoan sponges of Alaska and Yukon Territory. Journal of Paleontology 62:731-746"	2
30180	"Ulrich, E. O. ,A. F. Foerste, A. K. Miller, W. M. Furnish. 1942. Ozarkian and Canadian cephalopods, Part I: Nautilicones. Geological Society of America Special Papers 37:1-157"	2
11509	"Butts, C. 1926. The Paleozoic rocks. Geological Survey Alabama, Special Report 14:41-230"	1
10956	"Pojeta, J. and B. Runnegar. 1976. The paleontology of rostroconch mollusks and the early history of the phylum Mollusca. United States Geological Survey Professional Paper 968:1-88"	3
34421	"Savage, N. M. 1989. The occurrence of the brachiopods Nanukidium and Atrypoidea in the Late Silurian of southeastern Alaska, Alexander terrane. Journal of Paleontology 63:530-533"	1
16397	"Ulrich, E. O. ,A. F. Foerste, A. K. Miller, W. M. Furnish. 1944. Ozarkian and Canadian cephalopods, longicones and summary. Geological Society of America Special Paper 58:1-226"	3
34646	"Norford, B. S. 1967. Upper Ordovician corals Chaetetipora and Sibiriolites from northern Ellesmere Island, District of Franklin. Geological Survey of Canada 197:1-11"	2
34650	"Christie, R. L. 1964. Geological Reconnaissance of northeastern Ellesmere Island, District of Franklin. Geological Survey of Canada Memoir 331:1-79"	2
35193	"Whittington, H. B. 1956. Silicified Middle Ordovician trilobites: the Odontopleuridae. Bulletin of the Museum of Comparative Zoology 114:155-288"	5
25414	"Ross, Jr., R. J. 1951. Stratigraphy of the Garden City Formation in northeastern Utah, and its trilobite faunas. Yale Peabody Museum of Natural History Bulletin 6:1-161"	48
25408	"Ross, Jr., R. 1968. Brachiopods from the Upper Part of the Garden City Formation (Ordovician) North-Central Utah. United States Geological Survey Professional Paper 593-H:-"	1
18349	"Hintze, L.F. 1951. Lower Ordovician detailed stratigraphic sections for western Utah. Utah Geological and Mineralogical Survey Bulletin 39:99 p.-"	82
25411	"Ross, Jr., J. 1970. Ordovician Brachiopods, Trilobites, and Stratigraphy in Eastern and Central Nevada. United States Geological Survey Professional Paper 639:-"	143
25412	"Titus, R. 2007. R. Titus unpublished collections.  Unpublished data"	56
25413	"Ross, Jr., R. J. and H. B. Barnes. 1967. Some Middle Ordovician Brachiopods and Trilobites from the Basin Ranges, Western United States. United States Geological Survey Professional Paper 523-D:-"	5
25415	"Fortey, R. A. and M. L. Droser. 1999. Trilobites from the Base of the Type Whiterockian (Middle Ordovician) in Nevada. Journal of Paleontology 73:182-201"	4
35067	"Whittington, H. B. and C. H. Kindle. 1963. Middle Ordovician Table Head Formation, western Newfoundland. Geological Society America Bulletin 74:745-758"	34
35079	"Whittington, H. B. 1965. Trilobites of the Ordovician Table Head Formation, western Newfoundland. Bulletin of the Museum of Comparative Zoology 132:275-441"	3
35160	"Ross, Jr., R. J. 1953. Additional Garden City (Early Ordovician) trilobites. Journal of Paleontology 27:633-646"	5
35208	"Whittington, H. B. 1959. Silicified Middle Ordovician trilobites: Remopleuridae, Trinucleidae, Raphiophoridae, Endymioniidae. Bulletin of the Museum of Comparative Zoology 121:371-496"	4
34728	"Ross, Jr., R. J. and F. C. Shaw. 1972. Distribution of the Middle Ordovician Copenhagen Formation and its trilobites in Nevada. United States Geological Survey Professional Paper 749:1-33"	17
35267	"Shaw, F. C. 1974. Simpson Group (Middle Ordovician) trilobites of Oklahoma. Paleontological Society Memoir 6:1-54"	40
34502	"Oliver, Jr., W. A. ,C. W. Merriam, M. Churkin, Jr.. 1975. Ordovician, Silurian, and Devonian corals of Alaska. United States Geological Survey Professional Paper 823-B:13-44"	3
36086	"Trettin, H. P. 1969. Geology of Ordovician to Pennsylvanian rocks, M'Clintock Inlet, north coast of Ellesmere Island, Canadian Arctic Archipelago. Geological Survey of Canada Bulletin 183:1-93"	19
36489	"Shaw, F. C. and T. E. Bolton. 2011. Ordovician trilobites from the Romaine and Mingan Formations (Ibexian-Late Whiterockian), Mingan Islands, Quebec. Journal of Paleontology 85:406-441"	42
36753	"Nestor, H. ,P. Copper, C. Stock. 2010. . In . Late Ordovician and Early Silurian stromatoporoid sponges from Anticosti Island, eastern Canada: Crossing the O/S mass extinction boundary 1-163"	67
37212	"Churkin, Jr., M. and E. E. Brabb. 1965. Ordovician, Silurian, and Devonian biostratigraphy of east-central Alaska. Bulletin of the American Association of Petroleum Geologists 49:172-185"	26
38316	"Johns, R. A. 1994. Ordovician lithistid sponges of the Great Basin. Nevada Bureau of Mines and Geology Open-File Report 94:1-156"	3
38344	"Greife, J. L. and R. L. Langenheim. 1963. Sponges and brachiopods from the Middle Ordovician Mazourka Formation, Independence quadrangle, California. Journal of Paleontology 37:564-574"	6
38395	"Rigby, J. K. and B. D. E. Chatterton. 1989. Middle Silurian Ludlovian and Wenlockian sponges from Baillie-Hamilton and Cornwallis Islands, Arctic Canada. Geological Survey of Canada Bulletin 391:1-69"	2
38424	"Rigby, J. K. 1973. A new anthaspidellid sponge from the Silurian of Lake Timiskaming, Quebec. Journal of Paleontology 47:801-804"	1
38615	"Rigby, J. K. 1971. Sponges of the Ordovician Cat Head Member, Lake Winnipeg, Manitoba. Geological Survey of Canada Bulletin 202:35-79"	1
38511	"Rigby, J. K. and P. A. Johnston. 2004. An unusually large Aulocopella winnipegensis and associated demosponges from the Upper Ordovician Beaverfoot Formation, southeastern British Columbia. Canadian Journal of Earth Sciences 41:939-947"	1
38513	"Rigby, J. K. and T. N. Bayer. 1971. Sponges of the Ordovician Maquoketa Formation in Minnesota and Iowa. Journal of Paleontology 45:608-627"	4
38520	"Rigby, J. K. ,J. L. Nelson, B. S. Norford. 1998. Silurian hexactinellid sponges from northern British Columbia, Canada. Journal of Paleontology 72:202-220"	1
38562	"Rigby, J. K. and M. H. Nitecki. 1973. New Archaeoscyphia (Porifera) from the Ordovician of Anticosti Island, Quebec. Fieldiana Geology 33:1-10"	1
38643	"Rigby, J. K. 1966. Microstructure and classification of an Ordovician sponge, Dystactospongia madisonensis Foerste, from Indiana. Journal of Paleontology 40:1127-1130"