Ilymatogyra ram's horn oyster fossil.jpg

Ilymatogyra ram's horn oyster fossil

SITE LOCATION: Del Rio, Texas
TIME PERIOD: Lower Cretaceous (100-145 million years ago)
Data: The Gryphaeidae, common name the foam oysters or honeycomb oysters, are a family of marine bivalve mollusks, and are a kind of true oyster. This family of bivalves is very well represented in the fossil record, however the number of living species is very few. All species have shells cemented to a substrate. Shells are considered brittle, inequivalve, with the left, lower (cemented) valve convex and the right (upper, non-cemented) valve flat or slightly concave.
Kingdom: Animalia
Phylum: Mollusca
Class: Bivalvia
Order: Ostreida
Family: †Gryphaeidae
Genus: †Ilymatogyra