Bivalve
Fossil
Also called Clam, Pelecypod, and Lamellibranch
About it
Two-shelled molluscs whose two valves are usually mirror images, unlike a brachiopod, whose valves differ. Abundant in Mesozoic and Cenozoic rocks; Florida's Pliocene shell pits and Maryland's Calvert Cliffs are well known.
- Type
- Fossil (mollusc)
- Group
- Bivalve (mollusc)
- Colours
- white, cream, grey, brown, tan
- Transparency
- opaque
- Periods
- Jurassic, Cretaceous, Paleogene, Neogene, Quaternary
Typical values: real specimens vary. For more, see mindat.org.