Blastoid Fossils

From Ohio History Central
Blastoid Fossils.jpg
Blastoid Fossils. Photo taken by DanielCD on 4/19/05.

Blastoids were echinoderms with a hickory-nut sized and shaped body attached to a long stalk, similar to that of a crinoid. They are known from Silurian, Devonian, and Mississippian rocks. They are common in some units.