Inoceramus

About it

Cretaceous clam with broad, concentric ridges and a shell of calcite prisms that splits into fibre-like flakes. Relatives now called Platyceramus grew over a metre wide; common in the Kansas chalk and the Pierre Shale.

Type

Fossil (mollusc)

Group

Bivalve (mollusc)

Colours

grey, brown, cream, iridescent

Transparency

opaque

Periods

Cretaceous

Typical values: real specimens vary. For more, see mindat.org.