Middle Cambrian

Chisolm Shale

Pioche, NV, USA

Nice 22mm eocrinoid from an unusual locality.

Eocrinoid.

Gogia is a genus of eocrinoid that lived during the Cambrian Period.  Its remains have been found in North America and Europe.

Eocrinoids are one of the earliest-known groups of echinoderms.  The name implies that they are ancestral to crinoids but they are not despite the fact that both groups have very similar structure (holdfast, stalk, plated body, arms).  Eocrinoids appeared in the Early Cambrian but became extinct by the end of the Silurian.