James St. John:
Exogyra sp. (fossil oyster shell) (Navesink Marl, Upper Cretaceous, ~68 Ma; Wilmington, Delaware, USA) 1
James St. John:
Exogyra sp. (fossil oyster shell) (Navesink Marl, Upper Cretaceous, ~68 Ma; Wilmington, Delaware, USA) 2
James St. John:
Exogyra sp. (fossil oyster shell) (Navesink Marl, Upper Cretaceous, ~68 Ma; Wilmington, Delaware, USA) 3