Exogyra erraticostata (Stephenson, 1914)

Remarks

• Collector:    Keith Minor
• Formation:  Austin Group, Burditt Formation
• Location:     Travis County, Texas

General Info

Synonyms (older names and misidentifications in the literature)

• 1914 Exogyra ponderosa var. erraticostata Stephenson

• 1923 Exogyra ponderosa var. erraticostata Stephenson

• 1928 Exogyra ponderosa var. erraticostata Stephenson; Adkins

• 1936 Exogyra ponderosa erraticostata Stephenson

• 1940 Exogyra ponderosa erraticostata Stephenson and Monroe

• 1958 Exogyra ponderosa erraticostata Stephenson; Richards

• 1963 Exogyra ponderosa erraticostata Stephenson; Young

• 1982 Exogyra erraticostata Stephenson; Offeman et al.

Stratigraphic Occurrence

• Taylor Group, Pecan Gap Chalk of North and Central Texas

• Lower Taylor Group, presumably Ozan of North and Central Texas

• Top of the Austin Group, Brownstown Formation of Northeast Texas and Arkansas

• Upper Austin Group, Burditt Formation of Central Texas

• Upper Austin Group, Dessau Formation of Central Texas

• Tornillo Group, San Carlos Formation of Trans-Pecos Texas

• Eutaw Formation, Tombigbee Sand Member of Alabama, Georgia, and Mississippi

• Lower Selma Group, Mooreville Formation of Alabama and Mississippi

• Selma Group, Coffee Sand of Mississippi and Tennessee

• Top of the Black Creek Formation of North and South Carolina

• Matawan Group, Marshalltown Formation of New Jersey and Delaware

• Basal Matawan Group, Woodbury Formation of New Jersey

Age

• Exogyra erraticostata ranges from the Submortoniceras tequesquitensis Young zone to about the Baculites mclearni Landes zone (early Santonian to middle Campanian, ~86–80 mya), the same range as Exogyra ponderosa Roemer.

Geographic Occurrence (not an all-inclusive list)

• Bell County, TX
• Bladen County, NC
• Dallas County, TX
• Hempstead County, AR
• Greene County, AL
• Itawamba County, MS
• Kaufman County, TX
• Lee County, MS
• Lowndes County, MS
• Marion County, GA
• McNairy County, TN
• Monmouth County, NJ
• Monroe County, MS
• Marion County, SC
• Maverick County, TX
• New Castle County, DE
• Perry County, AL
• Pike County, AL
• Pitt County, NC
• Prentiss County, MS
• Presidio County, TX
• Red River County, TX
• Stewart County, GA
• Travis County, TX

Remarks

         For identification and descriptions, see:

• Richards, H. G. 1958. The Cretaceous Fossils of New Jersey. New Jersey Geological Survey Bulletin 61 (2), 117–118.

• Stephenson, L. W. 1914. Cretaceous Deposits of the Eastern Gulf Region and Species of Exogyra from the Eastern Gulf Region and the Carolinas. United States Geological Survey Professional Paper 81.