Leptomaria austinense (Shumard, 1861)

Remarks

• Collector:    Bill Jolley
• Formation:  Georgetown Limestone
• Location:     Williamson County, TX

Remarks

• Collector:    Keith Minor
• Formation:  Washita Group, Duck Creek Limestone
• Location:     Tarrant County, TX

General Info

Synonyms (older names and misidentifications in the literature)

• 1849 Pleurotomaria sp. ind. Römer
• 1852 Pleurotomaria sp. ind. Römer
• 1861 Pleurotomaria austinensis Shumard
• 1893 Pleurotomaria robusta Cragin
• 1920 Pleurotomaria austinensis Shumard; Adkins and Winton
• 1928 Pleurotomaria austinensis Shumard; Adkins
• 1947 Pleurotomaria austinensis Shumard; Stanton
• 1960 Pleurotomaria (Leptomaria) austinensis Shumard; Perkins
• 1960 Leptomaria austinensis (Shumard); Knight
• 1989 Pleurotomaria (Amauropsis) robusta Cragin; Finsley
• 1994 Leptomaria austinensis (Shumard); Akers
• 1997 Leptomaria austinensis (Shumard); Akers and Akers

Stratigraphic Occurrence

• Washita Group, Weno Formation of North Texas
• Washita Group, Fort Worth Formation of North Texas
• Washita Group, Duck Creek Formation of North Texas
• Washita Group, Georgetown Formation of Central Texas
• Washita Group Equivalent, Upper Aurora Limestone of Coahuila, Mexico

Age

• Leptomaria austinense (Shumard) ranges from the Mortoniceras equidistans (Cragin) zone to the Mortoniceras (Angolaites) drakei zone, lower Upper Albian to Uppermost Albian (~100–97 mya).

Geographic Occurrence (not an all-inclusive list)

• Bexar County, TX
• Coahuila, Mexico
• McLennan County, TX
• Tarrant County, TX
• Travis County, TX
• Williamson County, TX

Remarks

         For identification and descriptions, see:

• Perkins, B. F.  1960.  Biostratigraphic Studies in the Comanche (Cretaceous) Series of Northern Mexico and Texas.  Geological Society of America Memoir 83.