Eutrephoceras dekayi (Morton, 1834)

Remarks

• Memphis Pink Palace Museum (Lynn Harrell, Jr.)

• Ripley Fm, Coon Creek Tongue

• McNairy County, TN

Remarks

• M.A.P.S (Ralph Johnson)

• Monmouth Group, Severn Formation

• Maryland

Remarks

• Bill Jolley

• Austin Group, Burditt Marl

• Williamson County, TX

General Info

Synonyms (older names and misidentifications in the literature)

There are many gradational varieties of E. dekayi (Morton).  We've lumped everything together.

• 1833 Nautilus dekayi Morton

• 1834 Nautilus dekayi Morton

• 1834 Nautilus perlatus Morton

• 1850 Nautilus dekayi Morton; d'Orbigny (in part)

• 1856 Nautilus dekayi Morton; Hall and Meek

• 1856 Nautilus dekayi Morton; Meek and Hayden

• 1858 Nautilus dekayi Morton; Mallet and Tuomey

• 1859 Nautilus dekayi Morton; Meek

• 1860 Nautilus dekayi Morton; Conrad

• 1861 Nautilus dekayi Morton; Gabb

• 1864 Nautilus dekayi Morton; Meek

• 1868 Nautilus dekayi Morton; Conrad

• 1876 Nautilus dekayi Morton; Meek

• 1876 Nautilus dekayi montanensis Meek

• 1877 Nautilus dekayi Morton; Gabb

• 1880 Nautilus dekayi montanensis Meek; Whitfield

• 1880 Nautilus dekayi Morton; Foord

• 1892 Nautilus dekayi Morton; Whitfield

• 1894 Nautilus dekayi Morton; Hyatt

• 1899 Nautilus (Eutrephoceras) dekayi Morton; Clarke

• 1905 Eutrephoceras dekayi (Morton); Johnson

• 1905 Nautilus perlatus Morton; Johnson

• 1907 Nautilus dekayi Morton; Weller

• 1914 Nautilus dekayi Morton; Stephenson

• 1914 (?) Nautilus sp. nov. Stephenson

• 1916 Eutrephoceras dekayi (Morton); Gardner

• 1924 Eutrephoceras sp. 1 Reeside

• 1926 Eutrephoceras dekayi (Morton); Wade

• 1927 Eutrephoceras sp. 1 Reeside

• 1927 (?) Eutrephoceras alcesense Reeside

• 1927 (?) Eutrephoceras thomi Reeside

• 1927 (?) Eutrephoceras sp. Reeside

• 1933 Eutrephoceras dekayi (Morton); Spath

• 1941 Eutrephoceras planoventer Stephenson

• 1947 Eutrephoceras dekayi s. 1 Miller

• 1962 Eutrephoceras dekayi alcesense Reeside; Richards

• 1962 Eutrephoceras dekayi dekayi (Morton); Richards

• 1962 Eutrephoceras dekayi perlatum (Morton); Richards

Stratigraphic Occurrence

• Monmouth Group, Navesink Formation of New Jersey and Delaware

• Monmouth Group, Redbank Formation of New Jersey

• Monmouth Group, Severn Formation of Maryland

• Coon Creek Tongue, Ripley Formation of southwestern Tennessee northern Mississippi

• Prairie Bluff Formation of Georgia and Alabama

• Ripley Formation of Alabama

• Pierre Shale of Nebraska, South Dakota, and Wyoming

• Cody Shale of Wyoming

• Steele Shale of Wyoming

• Montana Group, Telegraph Creek Formation of Montana

• Montana Group, Eagle Formation of Montana

• Navarro Group, Neylandville Formation of northeastern Texas

• Navarro Group, Nacatoch Formation of northeastern Texas

• Navarro Group, Corsicana Formation of north Texas

• Uppermost Mancos Shale of New Mexico

• Basal Mesaverde Group (formation ?) of New Mexico

Age

• Eutrephoceras dekayi (Morton) ranges from the Scaphites hippocrepis zone (lower Campanian Stage) to the uppermost Maastrichtian (~82–65 mya).

Geographic Occurrence (not an all-inclusive list)

• Burlington County, NJ

• Camden County, NJ

• Gloucester County, NJ

• Kaufman County, TX

• McNairy County, TN

• Monmouth County, NJ

• Navarro County, TX

• Pontotoc County, MS

• Somerset County, NJ

• Sumter County, AL

• Tippah County, MS

• Union County, MS

Remarks

         For identification and descriptions, see:

• Richards, H. G.  1962.  The Cretaceous Fossils of New Jersey, Part 2.  New Jersey Geological Survey Bulletin 61.

• Stephenson, L. W.  1941.  The Larger Invertebrate Fossils of the Navarro Group of Texas (Exclusive of Corals and Crustaceans, and Exclusive of the Fauna of the Escondido Formation).  University of Texas Bulletin 4101.