Ptychodus mortoni Mantell, 1839

Remarks

• Collector:      Lee Duchouquette

• Formation:    Eagle Ford Group, Arcadia Park Shale

• Location:       Dallas County, TX

• Dimensions:  lt = 1.75 in

General Info

Synonyms (older names and misidentifications in the literature)

• extinct shell-crushing shark
• 1839 Ptychodus mortoni Mantell
• 1868 Ptychodus mortoni Mantell; Leidy
• 1940 Ptychodus mortoni Mantell; Stephenson & Monroe
• 1970 Ptychodus mortoni Mantell; Applegate
• 1993 Ptychodus mortoni Mantell; Welton & Farish

Stratigraphic Occurrence

• Prairie Bluff Chalk of Alabama
• Ripley Formation of Mississippi
• Basal Niobrara Group, Fort Hays Limestone of western Kansas
• Basal Austin Group, lower Atco Formation of north Texas
• Upper Eagle Ford Group, Arcadia Park Formation of north Texas
• Upper Chalk of Kent, England
• Upper Cretaceous rocks of Italy
• Upper Cretaceous rocks of Mexico

Age

• Ptychodus mortoni Mantell ranges from the very Late Turonian Stage to about the late Early Maastrichtian Stage (~88–70 mya).

Geographic Occurrence (not an all-inclusive list)

• Dallas County, AL
• Dallas County, TX
• England
• Gove County, KS
• Greene County, AL
• Italy
• Mexico
• Mississippi (county ?)
• Perry County, AL
• Travis County, TX
• Upper Chalk, England

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, 62–63.