Dolorthoceras tenuifilosum
Lower Carboniferous
Chester Series
Colbert County, Alabama, USA
21mm nautiloid with microconch still attached on 54mm matrix. Rare.

Cephalopod.

Dolorthoceras is a genus of nautiloid known from the Early Devonian to Early Permian of North America, Europe, Asia, and Australia.

Fine example with microconch (male) attached with bits of other fossils in matrix.