This specimen is the inner
lining of an Exogyra and is 4.5 cm by 3.3 cm in size.
An orbicular adductor muscle cavity is apparent and is
located in the center of the fossil. The commissural shelf can
also be distinguished.
Name
Genus Ostrea, Subgenus
Exogyra.
Age
Late Cretaceous
Formation
Hornerstown--MFL Layer
Comments
This specimen is a steinkern of
the rounded keel of Gryphaea's beak. It is 2.5 by 2.4
centimeters in length. The longer side is the measurment from
the tip of the beak into the center of the shell.
Name
Genus Ostrea, Subgenus
Exogyra.
Age
Late Cretaceous
Formation
Hornerstown--MFL Layer
Comments
This specimen is a part of
Gryphaea's
shell and is 4 centimeters by 2.8 centimeters in length.
According
to the Treatise on Invertebrate Paleontology, this holed
portion seems to be from the shell's ventral end, close to the
commissure.
