Balashov Z. G. 1955. Ordovician nautiloids. In Field Atlas of the Ordovician and Silurian fauna of the Siberian Platform (eds Team of Authors), pp. 87–104. St Petersburg: Gostechgeologistat (in Russian).
Balashov Z. G. 1968. Ordovician Endoceratoidea of the USSR. St Petersburg: Isdatel'stvo Leningradskogo Universiteta, 170 pp. (in Russian).
Bassler R. S. 1915. Bibliographic index of American Ordovician and Silurian Fossils. Bulletin of the United States National Museum 92, 1521 pp.
Billings E. 1859. Fossils of the Calciferous Sandrock, including those of a deposit of white limestone at Mingan, supposed to belong to the formation. Canadian Naturalist and Geologist, Proceedings of the Society of Natural History of Montreal 4, 345–67.
Billings E. 1865. Palaeozoic fossils. Containing descriptions and figures of new or little known species of organic remains from the Silurian rocks. Geological Survey of Canada, Montreal 1, 169–394.
Brugière J. G. 1789. Histoire naturelle des vers. Vol. 1.1. Encyclopedie methodique 6, 1–757.
Cady W. M. 1945. Stratigraphy and structure of west-central Vermont. Geological Society of America Bulletin 56, 515–58.
Chao A. 1984. Non-parametric estimation of the number of classes in a population. Scandinavian Journal of Statistics 11, 265–70.
Chazdon R. L., Colwell R. K., Denslow J. S. & Guariguata M. R. 1998. Statistical methods for estimating species richness of woody regeneration in primary and secondary rain forests of NE Costa Rica. In Forest biodiversity research, monitoring and modeling: Conceptual background and Old World case studies (eds Dallmeier F. & Comiskey J. A.), pp. 285–309. Paris: Parthenon Publishing, 671 pp.
Clarke J. M. & Schuchert C. 1899. The nomenclature of the New York series of geological formations. Science (new series) 1899, 876–7.
Clarke K. R. & Warwick R. M. 1998. A taxonomic distinctness index and its statistical properties. Journal of Applied Ecology 35, 523–31.
Clarke K. R. & Warwick R. M. 1999. The taxonomic distinctness measure of biodiversity: weighting of step lengths between hierarchical levels. Marine Ecology Progress Series 184, 21–9.
Cloud P. E. & Barnes V. 1948. The Ellenburger Group of central Texas. University of Texas Publications 4621, 473 pp.
Colwell R. K. 2005. EstimateS: Statistical estimation of species richness and shared species from samples. Version 7.5. User's Guide and application published at: http://purl.oclc.org/estimates.
Dwight W. B. 1879. On some recent explorations in the Wappinger valley limestone of Dutchess Co., N. Y. No. 2. Calciferous as well as Trenton fossils in the Wappinger Limestone at Rochdale and a Trenton locality at Newburgh, N. Y. American Journal of Science, third series 17, 289–92.
Dwight W. B. 1880. Recent explorations in the Wappinger valley limestones and other formations of Dutchess Co., N. Y. No. 2. Calciferous as well as Trenton fossils in the Wappinger Limestone at Rochdale and a Trenton locality at Newburgh, N. Y. American Journal of Science, third series 17 (101), 50–4.
Dwight W. B. 1881. Further discoveries of fossils in the Wappinger Valley or Barnegat limestone. American Journal of Science, third series 21, 78–9.
Dwight W. B. 1884. Recent explorations in the Wappinger valley limestones and other formations of Dutchess Co., N. Y. No. 4. Descriptions of Calciferous (?) fossils. American Journal of Science 27, 249–59.
Dwight W. B. 1889. Recent explorations in the Wappinger valley limestones and other formations of Dutchess Co., N. Y. No. 8. Discovery of Calciferous fossils in the Millerton–Fishkill limestone belt; also in a belt near Rhinebeck. American Journal of Science 38, 150–83.
Dzik J. 1984. Phylogeny of the Nautiloidea. Palaeontologia Polonica 45, 203 pp.
Evans D. H. 2005. The Lower and Middle Ordovician cephalopod faunas of England and Wales. Monograph of the Palaeontographical Society 628, 81 pp.
Fisher D. W. 1984. Bedrock geology of the Glens Falls–Whitehall region, New York. New York State Museum Map and Chart Series 35, 58 pp.
Flower R. H. 1941. Notes on the structure and phylogeny of eurysiphonate cephalopods. Palaeontographica Americana 3 (13), 5–51.
Flower R. H. 1952. Cephalopods from the Harding and Manitou Formations of Colorado. Journal of Paleontology 26, 505–27.
Flower R. H. 1955. Status of endoceroid classification. Journal of Paleontology 29, 329–71.
Flower R. H. 1956. Cephalopods from the Canadian of Maryland. Journal of Paleontology 3, 75–96.
Flower R. H. 1964 a. The nautiloid order Ellesmeroceratida (Cephalopoda). New Mexico Institute of Mining and Technology, State Bureau of Mines and Mineral Resources, Memoir 12, 164 pp.
Flower R. H. 1964 b. Early Paleozoic in New Mexico. In Southwestern New Mexico, Guidebook 16th field conference (eds Fitzsimmons J. P. & Balk C. L.), pp. 112–13. Socorro: New Mexico Geological Society.
Flower R. H. 1964 c. Nautiloid shell morphology. New Mexico Institute of Mining and Technology, State Bureau of Mines and Mineral Resources, Memoir 13, 1–77.
Flower R. H. 1968. Fossils from the Fort Ann Formation. New Mexico Institute of Mining and Technology, State Bureau of Mines and Mineral Resources, Memoir 22, 29–34.
Flower R. H. 1969. Early Paleozoic of New Mexico and El Paso region. In The Ordovician symposium (ed. LeMone D. V.), pp. 31–103. El Paso Geological Society and Permian Basin Society of Economic Paleontologists and Mineralogists.
Flower R. H. 1976. Ordovician cephalopod faunas and their role in correlation. In The Ordovician System: Proceedings of a Palaeontological Association Symposium, Birmingham (England), September 1974 (ed. Bassett M. G.), pp. 523–52. Cardiff: University of Wales & National Museum of Wales.
Flower R. H. & Kummel B. 1950. A classification of the Nautiloidea. Journal of Paleontology 24, 604–16.
Foerste A. F. 1921. Notes on Arctic Ordovician and Silurian Cephalopods, chiefly from Boothia Felix-King William Land, Bache Peninsula, and Bear Island. Denison University Bulletin, Journal of the Scientific Laboratories 19, 247–306.
Foerste A. F. 1924. Notes on American Paleozoic cephalopods. Denison University Bulletin, Journal of the Scientific Laboratories 20, 193–268.
Foerste A. F. 1925. Notes on cephalopod genera, chiefly coiled Silurian forms. Denison University Bulletin, Journal of the Scientific Laboratories 21, 1–69.
Foerste A. F. 1936. Silurian cephalopods of the Port Daniel area on Gaspe Peninsula, Eastern Canada. Denison University Bulletin, Journal of the Scientific Laboratories 31, 21–92.
Frey R. C., Beresi M. S., Evans D. H., King A. H. & Percival I. G. 2004. Nautiloid cephalopods. In The Great Ordovician Biodiversification Event (eds Webby B. D., Paris F., Droser M. L. & Percival I. G.), pp. 209–13. New York: Columbia University Press.
Furnish W. M. & Glenister B. F. 1964 a. Nautiloidea–Ellesmerocerida. In Treatise on Invertebrate Paleontology, Part K, Mollusca 3 (ed. Moore R. C.), pp. K129–59. Boulder, Colorado and Lawrence, Kansas: Geological Society of America and the University of Kansas Press.
Furnish W. M. & Glenister B. F. 1964 b. Nautiloidea–Tarphycerida. In Treatise on Invertebrate Paleontology, Part K, Mollusca 3 (ed. Moore R. C.), pp. K343–68. Boulder, Colorado and Lawrence, Kansas: Geological Society of America and the University of Kansas Press.
Hall J. 1847. Natural History of New York, Palaeontology, Vol. 1, containing descriptions of the organic remains of the lower division of the New-York system (equivalent of the Lower Silurian rocks of Europe). Albany: Van Benthuysen, 338 pp.
Hintze L. F. 1953. Lower Ordovician trilobites from Western Utah and eastern Nevada. Utah Geological and Mineralogical Survey, Bulletin 48, 1–249.
Hyatt A. 1894. Phylogeny of an acquired characteristic. Proceedings of the American Philosophical Society 32, 349–647.
Hyatt A. 1900. Cephalopoda. In Textbook of Paleontology, 1 (ed. von Zittel K. A.; 2nd edn, trans./ed. Eastmann C. R.), pp. 502–92. London: Macmillan and Co., 839 pp.
Knopf E. B. 1927. Some results of recent work in the southern Taconic area. American Journal of Science 214, 429–58.
Knopf E. B. 1962. Stratigraphy and structure of the Stissing Mountain area, Dutchess County, New York. Stanford University Publications, Geological Sciences 7, 1–55.
Kobayashi T. 1934. The Cambro-Ordovician formations and faunas of South Chosen. Palaeontology. Part II. Lower Ordovician faunas. Journal of the Faculty of Sciences of the Imperial University of Tokyo, Section II, Geology, Mineralogy, Geography, Seismology 3, 249–328.
Kobayashi T. 1937. Contribution to the study of the apical end of Ordovician nautiloids. Japanese Journal of Geology and Geography 14, 1–21.
Kröger B. 2003. The size of siphuncle in cephalopod evolution. Senckenbergiana lethaea 83, 39–52.
Kröger B. 2004. Large shell injuries in Middle Ordovician Orthocerida (Nautiloidea, Cephalopoda). GFF 126, 311–16.
Kröger B. 2005. Adaptive evolution in Paleozoic coiled Cephalopods. Paleobiology 31, 253–68.
Kröger B. & Landing E. 2007. The earliest Ordovician cephalopods of eastern Laurentia – Ellesmerocerids of the Tribes Hill Formation, Eastern New York. Journal of Paleontology 81, 841–57.
Kröger B. & Mapes R. 2007. On the origin of bactritoids (Cephalopoda). Paläontologische Zeitschrift 81 (3), 316–27.
Kröger B. & Mutvei H. 2005. Nautiloids with multiple paired muscle scars from Lower–Middle Ordovician of Baltoscandia. Palaeontology 48, 781–91.
Landing E. 1988. Depositional tectonics and biostratigraphy of the western portion of the Taconic allochthon, eastern New York State. In The Canadian Paleontology and Biostratigraphy Seminar, Proceedings (ed. Landing E.), pp. 96–110. New York State Museum Bulletin 462, 157 pp.
Landing E. 2002. Early Paleozoic sea levels and climates: new evidence from the east Laurentian shelf and slope. In Guidebook for Fieldtrips in New York and Vermont (eds J. McLelland & P. Karabinos), pp. C6–1–22. New England Intercollegiate Geological Conference 94th Annual Meeting and New York State Geological Association 74th Annual Meeting, Lake George, New York.
Landing E., Franzi D. A., Hagadorn J. W., Westrop S. R., Kröger B. & Dawson J. 2007. Cambrian of East Laurentia: field workshop in eastern New York and western Vermont. In Ediacaran–Ordovician of East Laurentia (ed. E. Landing), pp. 16–34. New York State Museum Bulletin 510, 93 pp.
Landing E. & Westrop S. R. 2006. Lower Ordovician faunas, stratigraphy, and sea-level history of the middle Beekmantown Group, northeastern New York. Journal of Paleontology 80, 958–80.
Landing E., Westrop S. R. & Knox L. 1996. Conodonts, stratigraphy, and relative sea-level changes of the Tribes Hill Formation (Lower Ordovician), east-central New York. Journal of Paleontology 70, 652–76.
Landing E., Westrop S. R. & Van Aller Hernick L. 2003. Uppermost Cambrian–Lower Ordovician faunas and Laurentian platform sequence stratigraphy, eastern New York and Vermont. Journal of Paleontology 77, 78–98.
Landing E., Westrop S. R. & Keppie J. D. 2007. Terminal Cambrian and lowest Ordovician succession of Mexican West Gondwana – biotas and sequence stratigraphy of the Tiñu Formation. Geological Magazine 144, 909–36.
Magurran A. E. 2004. Measuring biological diversity. Oxford: Blackwell Science, 260 pp.
Manda S. 2001. Some new or little known cephalopods from the Lower Devonian Pragian carbonate shelf (Prague Basin, Bohemia) with remarks on Lochkovian and Pragian cephalopod evolution. Journal of the Czech Geological Society 46, 269–86.
Murchison R. I. 1859. On the succession of the older Rocks in the northernmost counties of Scotland; with some observations on the Orkney and Shetland Islands. The Quarterly Journal of the Geological Society of London 15, 353–418.
Repetski J. E. 1982. Conodonts from the El Paso Group (Lower Ordovician) of westernmost Texas and southern New Mexico. New Mexico Bureau of Mines & Mineral Resources, Memoir 40, 1–59.
Repetski J. E., Loch J. D. & Ethington R. E. 1998. Conodonts and biostratigraphy of the Lower Ordovician Roubidoux Formation in and near the Ozark National Scenic Riverways, southeastern Missouri. National Park Service, Technical Report D-1308, 109–15.
Rodgers J. & Fisher D. W. 1969. Paleozoic rocks in Washington County, New York, west of the Taconic klippe. In Guidebook for Fieldtrips in New York, Massachusetts, and Vermont (ed. J. M. Bird), pp. 6.1–6.12. New England Intercollegiate Geological Conference, 61st Annual Meeting. State University of New York at Albany.
Ross R. J. Jr, Hintze L. F., Ethington R. L., Miller J. F., Taylor M. E., Repetski J. E., Sprinkle J. & Guensburg T. E. 1997. Observed ranges of trilobites, conodonts, echinoderms, molluscs, and brachiopods in the Ibexian Series composite stratotype section and adjacent rocks, House–Confusion Range area west-central Utah. U.S. Geological Survey Professional Paper 1579-A, 1–50.
Ruedemann R. 1905. The structure of some primitive cephalopods. New York State Museum Bulletin, 80 (10), 269–341.
Schröder H. 1891. Untersuchungen über silurische Cephalopoden. Paläontologische Abhandlungen, Neue Folge 1 (4), 1–48.
Swofford D. L. 1993. PAUP: Phylogenetic Analysis Using Parsimony, Version 3.1.1. Illinois Natural History Survey, 257 pp.
Teichert C. 1933. Der Bau der actinoceroiden Cephalopoden. Palaeontographica, A 77, 111–230.
Teichert C. 1964. Endoceratoidea. In Treatise on Invertebrate Paleontology, Part K, Mollusca 3 (ed. Moore R. C.), pp. K160–89. Boulder, Colorado, and Lawrence, Kansas: Geological Society of America and the University of Kansas Press.
Ulrich E. O. & Foerste A. F. 1935. New Genera of Ozarkian and Canadian cephalopods. Journal of the Scientific Laboratories of Denison University 30, 259–90.
Ulrich E. O., Foerste A. F., Miller A. K. & Furnish W. M. 1942. Ozarkian and Canadian cephalopods. Part I: Nautilicones. Geological Society of America Special Papers 37, 157 pp.
Ulrich E. O., Foerste A. F. & Miller A. 1943. Ozarkian and Canadian cephalopods. Part II: Brevicones. Geological Society of America Special Papers 59, 240 pp.
Ulrich E. O., Foerste A. F., Miller A. & Unklesbay A. G. 1944. Ozarkian and Canadian cephalopods Part III: Longicones and summary. Geological Society of America Special Papers 58, 226 pp.
Unklesbay A. G. 1961. Nautiloids from the Gorman and Honeycut of Central Texas. Journal of Paleontology 35, 373–9.
Unklesbay A. G. & Young R. S. 1956. Early Ordovician nautiloids from Virginia. Journal of Paleontology 30, 481–91.
Vanuxem L. 1842. Geology of New York, Pt. 3, Comprising the survey of the Third Geological District. Albany: W. & A. White & J. Visscher, 306 pp.
Whitfield R. P. 1886. Notice of geological investigations along the eastern shore of Lake Champlain, conducted by Prof. H. M. Seeley and Prest. Ezra Brainerd, of Middlebury College, with descriptions of the new fossils discovered. American Museum of Natural History Bulletin 1, 293–345.
Whitfield R. P. 1889. Descriptions of new species of Silurian fossils from the Calciferous sandrock of Lake Champlain and description of several new forms. American Museum of Natural History Bulletin 2, 41–63.