Exogyra
Fossil
Also called Exogyra ponderosa and Exogyra costata
About it
Cretaceous oyster with a heavy, cupped lower valve whose beak twists into a sideways spiral, and a flat lid. Common in Texas, Alabama, Mississippi, and New Jersey.
- Type
- Fossil (mollusc)
- Group
- Bivalve (mollusc)
- Colours
- grey, brown, cream, tan
- Transparency
- opaque
- Periods
- Cretaceous
Typical values: real specimens vary. For more, see mindat.org.