(43 references below)

• IKINS, W. C.  1939.  Some Echinoids From the Texas Cretaceous.  MA Thesis, University of Texas, Austin.
• IKINS, W. C.  1940.  Some Echinoids of the Cretaceous of Texas.  American Paleontology Bulletin 25 (90), 52–89.
• IKINS, W. C.  1941.  Stratigraphy and Paleontology of the Walnut and Comanche Peak Formations.  PhD Thesis, University of Texas, Austin.
• IKINS, W. C.  1949.  "Stratigraphy and Paleontology of the Walnut and Comanche Peak Formations".  In:  Cretaceous of Austin, Texas Area.  Shreveport Geological Society Guidebook, 17th Annual Field Trip, 65–84.
• IKINS, W. C.  1941.  Stratigraphy and Paleontology of the Walnut and Comanche Peak Formations.  MA Thesis, University of Texas, Austin.
• IKINS, W. C.  1949.  Stratigraphy and Paleontology of the Walnut and Comanche Peak Formations.  Shreveport Geological Society Guidebook 17th Annual Field Trip, 65–84.
• IKINS, W. C.; Clabaugh, B. S.  1940.  Some Fossils From the Edwards Formation of Texas.  American Paleontology Bulletin 26 (96), 263–283.
• IL'IN, V. D.  1957.  Arkhangelskiceras gen. nov. Iz Verkhnemelovikh Otlozhenii Zapadnaga Uzbekistana.  Akademiya Nauk SSSR Doklady 113 (2), 425–428  (English translation:  Arkhangelskiceras gen. nov. From the Upper Cretaceous Deposits of Western Uzbekistan.)
• IL'IN, V. D.  1961.  Stratigraphy and Fauna of the Albian Stage of West Uzbekistan and Contiguous Parts of East Turkmenia.  Tr. VNIGNI 35, 36-80.
• IL'IN, V. D.  1970.  "Verkhnesenomanskiye Ammonity Yugovostoka Sredney Azii".  In:  Stratigrafiya i Paleontologiya Mezozoyskikh Otlozheniy Sredney Azii.  Trudy Vsesoyuznyy Nauchno-Issledovatel'skiy Geologorazvedochnyy Neftyanoy Institut (VNIGNI) 69, 10–23. (English translation:  Upper Cenomanian Ammonites of Southeastern Central Asia.)
• IL'IN, V. D.; Krashennikov, V. A.; Trofimov, D. M.  1970.  On the Age of Strata with Indoceras africanense (Ammonites) and Laffitteina bibensis (Foraminifera) from Eastern Mali.  Isvestiya Akademii Nauk SSSR 1970 (5), 100–112.
• IMBRIE, J.  1956.  Biometrical Methods in the Study of Invertebrate Fossils.  American Museum of Natural History Bulletin 108, 215–252.
• IMLAY, R. W.  1936.  Evolution of the Coahuila Peninsula, México; Part 4, Geology of the Western Part of the Sierra de Parras.  Geological Society of America Bulletin 47 (7), 1091–1152.
• IMLAY, R. W.  1938.  Ammonites of the Taraises Formation of Northern Mexico.  Geological Society of America Bulletin 49, 539–602.
• IMLAY, R. W.  1940.  Lower Cretaceous and Jurassic Formations of Southern Arkansas and Their Oil and Gas Possibilities.  Arkansas Geological Survey, Information Circular 12.
• IMLAY, R. W.  1940.  Neocomian Fauna of Northern Mexico.  Geological Society of America Bulletin 51, 117–190.
• IMLAY, R. W.  1944.  Cretaceous Formations of Central America and México.  American Association of Petroleum Geologists Bulletin 28 (8), 1077–1195.
• IMLAY, R. W.  1944.  Stratigraphy of Northeastern Anzoategui, Venezuela.  American Association of Petroleum Geologists Bulletin 28, 1–28.
• IMLAY, R. W.  1957.  New Genera of Early Cretaceous Ammonites from California and Oregon.  Journal of the Washington Academy of Sciences 47 (8), 275–277.
• IMLAY, R. W.  1959.  New Genera of Early Cretaceous Ammonites From the Chitina Valley and Talkeetna Mountains, Alaska.  United States Geological Survey Professional Paper 345-D, 87–114.
• IMLAY, R. W.  1959.  New Genera of Early Cretaceous (Albian) Ammonites From Alaska.  Journal of Paleontology 33 (1), 179–185.
• IMLAY, R. W.  1959.  Succession and Speciation of the Pelecypod Aucella.  United States Geological Survey Professional Paper 314-G, 155–169.
• IMLAY, R. W.  1960.  Ammonites of Early Cretaceous Age (Valanginian and Hauterivian) From the Pacific Coast States.  United States Geological Survey Professional Paper 334-F, 167–228.
• IMLAY, R. W.  1960.  Early Cretaceous (Albian) Ammonites From the Chitina Valley and Talkeetna Mountains, Alaska.  United States Geological Survey Professional Paper 354-D, 87–114.
• p IMLAY, R. W.  1961.  Characteristic Early Cretaceous Megafossils From Northern Alaska.  United States Geological Survey Professional Paper 335, 1–74.
• IMLAY, R. W.  1968.  Lower Jurassic (Pliensbachian and Toarcian) Ammonites from Eastern Oregon and California.  United States Geological Survey Professional Paper 593-C, 1–51.
• IMLAY, R. W.  1980.  Middle Jurassic (Bathonian) Ammonites from Southern Alaska.  United States Geological Survey Professional Paper 1091, 1–39.
• IMLAY, R. W.  1981.  Late Jurassic Ammonites from Alaska.  United States Geological Survey Professional Paper 1190, 1–40.
• rf  IMLAY, R. W.; Reeside, J. B.  1954.  Correlation of the Cretaceous Formations of Greenland and Alaska.  Geological Society of America Bulletin 65 (3), 223–246.
• p IMMEL, H.  1979.  Die Crioceratiten (Ancyloceratina, Ammonoidea) des Mediterranen und Borealan Hauterive-Barreme (Unterkreide).  Palaeontographica A 163(1-3), 1-85.
• IMMEL, H.  1979.  Cenoman-Ammoniten aus den Losensteiner Schichten der Bayerischen Alpen.  In:  Wiedmann, J., ed.  Aspekte der Kreide Europas, IUGS Series A 6, 607–644.
• IMMEL, H.  1985.  Die Kreideammoniten des Glaukonitkalkes (O. Alb–O. Cenoman) des Kolah-Qazi-Gebirges Suedoestlich von Esfahan (Zentraliran).  Zitteliana 12, 87–137.
• IMMEL, H.; Klinger, H. C.; Wiedmann, J.  1982.  Die Cephalopoden des Unteren Santon der Gosau von Brandenberg/Tirol, Österreich.  Zitteliana 8, 3–32.
• INGELLS, J. J. C.  1957.  The Geology of the Lancaster Quadrangle of Dallas and Ellis Counties.  MS Thesis, Southern Methodist University.
• INGERSOLL, R. V.  1979.  Evolution of the Late Cretaceous Forearc Basin, Northern and Central California.  Geological Society of America Bulletin 90 (1), 813–826.
• IOANNIDES, N. S.  1986.  Dinoflagellate Cysts from Upper Cretaceous–Lower Tertiary Sections, Bylot and Devon Islands, Arctic Archipelago.  Geological Survey of Canada Bulletin 371, 1–99.
• ISRAELSKY, M. C.  1929.  Correlation of the Brownstown (Restricted) Formation of Arkansas.  American Association of Petroleum Geologists Bulletin 13 (1), 683–684.
• ISRAELSKY, M. C.  1924.  Echinoids from the Tampico Region, Mexico.  California Academy of Sciences Proceedings 13 (4), 137–145.
• ISHIBASHI, T.  1982.  Upper Jurassic and Lower Cretaceous Ammonites from Sarawak, Borneo, East Malaysia.  Geology and Palaeontology of Southeast Asia 23, 65–75.
• IVANOV, M.; Damyanova, T.  1996.  Stratigrafski Posledovatelnosti i Paleoekolgiya na urgonskiya kompleks v oblastta yuzhno ot gr. Lovech (Tsentralna Severni Bulgariya).  Spisanie na Bulgarskogo Geologichesko Druzhestvo 57 (3), 43–54. (English Translation:  Stratigraphical Sequences and Paleoecology of the Urgonian Complex, South of Lovech Town, North-Central Bulgaria.)
• IZETT, G. A.; Barclay, C. S. V.  1973.  Geologic Map of the Kremmling Quadrangle, Grand County, Colorado.  United States Geological Survey, Geological Map GQ-1115.
• IZETT, G. A.; Cobban, W. A.; Dalrymple, G. B.; Obradovich, J. D.  1998.  40Ar/39Ar Age of the Manson Impact Structure, Iowa, and Correlative Impact Ejecta in the Crow Creek Member of the Pierre Shale (Upper Cretaceous), South Dakota and Nebraska.  Geological Society of America Bulletin 110 (3), 361–376 (age ~74 mya).
• IZETT, G. A.; Cobban, W. A.; Gill, J. R.  1971.  The Pierre Shale Near Kremmling, Colorado, and Its Correlation to the East and the West.  United States Geological Survey Professional Paper 684-A, 1–19.
• IZETT, G. A.; Cobban, W. A.; Obradovich, J. D.; Kunk, M. J.  1993. The Manson Impact Structure: 40Ar/39Ar Age and Its Distal Impact Ejecta in the Pierre Shale in Southeastern South Dakota.  Science 262 (5134), 729–732.