1.2" Ordovician Gastropod (Salpingostoma) Fossil - Wisconsin
This is a 1.2" wide example of Salpingostoma buelli, a species of Ordovician-aged gastropod. This fossil is part of an old collection from the Grand Detour Formation in Beloit, Wisconsin. It has been exposed from the rock it was found in.
Gastropods, which are more commonly referred to as snails, have been around since the Late Cambrian period. The class Gastropoda contains a vast total of named species, second only to the insects in overall number. There are 611 known families of gastropods, of which 202 families are extinct and appear only in the fossil record.