Ptychodus anonymus Williston, 1900

Remarks

• Collector:      Dan Woehr

• Formation:    Eagle Ford Group (most likely Bouldin Formation)

• Location:       Travis County, TX

• Although Williston's types are lost, this guy is currently considered a valid species.

General Info

Synonyms (older names and misidentifications in the literature)

• extinct shell-crushing shark

• 1900 Ptychodus anonymus Williston

• 1977 Ptychodus anonymus Williston; Herman

• 1989 Ptychodus anonymus Williston; Welton & Farish

Stratigraphic Occurrence

• Eagle Ford Group, South Bosque Formation of central Texas

• Eagle Ford Group, Bouldin Flags of central Texas

• Eagle Ford Group, Britton Shale of north Texas

• Eagle Ford Group, Kamp Ranch Limestone of north Texas

• Benton Group, Carlile Formation of Kansas

Age

• Ptychodus anonymus Williston ranges approximately from the Middle Cenomanian Stage to the Late Turonian Stage (~ 95-88 mya).

Geographic Occurrence (not an all-inclusive list)

• Dallas County, TX
• Travis County, TX
• Kansas (county ?)

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, 57; fig's 1a-d, 2a-b, 3a-b, 4, 5a-b, 6, and 7a-7c.