Ptychodus occidentalisLeidy, 1868

Remarks

• Collector, Horizon, and Locale:  Lee Duchouquette, Eagle Ford Group, Kamp Ranch Member of the Eagle Ford Shale, Dallas County, TX.

General Info

Synonyms (older names and misidentifications in the literature)

• extinct shell–crushing shark
• 1868 Ptychodus occidentalis Leidy
• 1993 Ptychodus occidentalis Leidy; Welton and Farish

Stratigraphic Occurrence

• Upper Eagle Ford Group, Kamp Ranch Member of the Arcadia Park Formation, North Texas
• Lower Eagle Ford Group, Lake Waco Formation, Bouldin Member of Central Texas

Age

• Ptychodus occidentalis Leidy is found in the Collignoniceras woollgari (Mantell) zone (~91 mya).  Its occurrence in the Bouldin Flags is probably at the Collignoniceras woollgari (Mantell) level as well.  The Bouldin is in part Middle Turonian in age, see the Central Texas Stratigraphic Correlation Chart .

Geographic Occurrence (not an all-inclusive list)

• Dallas County, TX
• Travis County, TX

Remarks

         For identification and descriptions, see:

• Welton, B. J; Farish, R. F.  1993.  The  Collector’s  Guide  to  Fossil  Sharks  and  Rays  from  the  Cretaceous  of  Texas.  Lewisville:  Before Time.