Tripteroceroides
Nautiloid
Lower Mississippian (Meramecian)
St. Louis Limestone
Waterloo, Illinois, USA

Gorgeous 115mm block of silicified nautiloids and other cephalopods. Unique.

Cephalopod. Association. Jumble. Multiple. Carboniferous

Tripteroceroides is a nautiloid known from the Carboniferous of Kazakhstan and the American Midwest.

It’s an unusual display piece with an eerie look.