Thursday, August 24, 2017

Unknown Coiled Cephalopod Fossil

Recently, I was e-mailed these pictures of coiled cephalopod fossil. It was found by an 11 year old boy in rock from a quarry in northwest Illinois. The rock dates to the Silurian Period.

I think it might be a Lechritrochoceras. See the drawing of one at the Illinois State Geological Survey web site: