Amphidonte walkeri (White, 1879)

Remarks

• Collector:    Keith Minor

• Formation:  Washita Group, Georgetown Limestone

• Location:     Williamson County, TX

General Info

Synonyms (older names and misidentifications in the literature)

• 1821 Does not = Ostrea americana Defrance
• 1830 Does not = Ostrea americana Defrance; Deshayes
• 1834 Does not = Ostrea tortosa Morton
• 1858 Gryphaea sinuata var. americana Marcou
• 1869 Ostrea tortosa Conquand (in part)
• 1879 Exogyra valkeri White
• 1884 Exogyra walkeri White; White
• 1893 Exogyra americana (Marcou); Cragin (in part)
• 1920 Exogyra americana (Marcou); Adkins & Winton
• 1925 Exogyra americana (Marcou); Winton
• 1928 Exogyra americana (Marcou); Adkins
• 1930 Exogyra walkeri White; Adkins & Arick
• 1947 Exogyra walkeri White; Stanton
• 1959 Ceratostreon walkeri (White); Stenzel
• 1967 Exogyra walkeri White; Hendricks
• 1967 Exogyra americana (Marcou); Hendricks
• 1974 Amphidonte walkeri (White); Stenzel
• 2002 Amphidonte walkeri (White); Akers & Akers

Stratigraphic Occurrence

• Washita Group, Fort Worth Limestone
• Washita Group, Duck Creek Limestone
• Washita Group, Georgetown Limestone

Age

• Amphidonte walkeri (White) ranges from the Craginites serratescens (Cragin) Zone to the Mortoniceras lasswitzi (Young) Zone, Late Albian Stage (~101 to 100 mya).

Geographic Occurrence (not an all-inclusive list)

• Bell County, TX
• Grayson County, TX
• Hays County, TX
• Williamson County, TX

Remarks

         For identification, descriptions, and ranges, see:

• Stanton, T. W.  1947.  Studies of Some Comanche Pelecypods and Gastropods.  United States Geological Survey Professional Paper 211, 39–40; plate 31, fig's 1 and 2; and plate 32, fig's 1 and 2.