Description

Ceraurus pleurexanthemus
Ordovician
Spillway Member, Rust Formation, Trenton Group
Walcott-Rust Quarry, Trenton Falls, Herkimer County NY USA.

34mm trilobite and 33mm sponge(?) on 115mm slab.

Ceraurus is a genus of trilobite that lived during the Ordovician and Silurian Periods.  It is known from numerous sites in North America and also known from Europe and China.