Pachymya austinensis Shumard, 1860

Remarks

• Collector:    Keith Minor
• Formation:  Upper Washita Group, Mainstreet Limestone
• Location:     Denton County, TX

General Info

Synonyms (older names and misidentifications in the literature)

• 1860 Pachymya austinensis Shumard

• 1925 Pachymya austinensis Shumard; Winton

• 1928 Pachymya austinensis Shumard; Adkins

• 1947 Pachymya austinensis Shumard; Stanton

• 1955 Pachymya austinensis Shumard; Perkins & Albritton

• 1960 Pachymya austinensis Shumard; Perkins

• 1969 Pachymya austinensis Shumard; Moore

Stratigraphic Occurrence

• Uppermost Washita Grp, Buda Fm of central TX
• Uppermost Washita Grp, Grayson Fm of north TX
• Upper Washita Grp, Mainstreet Fm of north Texas
• Upper Washita Grp, Upper Mrl Member of the Weno Fm of north TX

Age

• Pachymya austinensis Shumard ranges from about the Mortoniceras (Angolaites) drakei (Young) zone to the Budaiceras hyatti (Shattuck) zone, very Late Albian to middle Early Cenomanian Stage (~98 to 97 mya).

Geographic Occurrence (not an all-inclusive list) 

• Bell County, TX

• Cooke County, TX

• Denton County, TX

• Johnson County, TX

• Tarrant County, TX

• Travis County, TX

Remarks

         For identification and descriptions, see:

• Adkins, W. S.  1928.  Handbook of Texas Cretaceous Fossils.  University of Texas Bulletin 2838 (an excellent specimen is on plate XV, figure 3).