This fossil is of the prosoma ("head") of an Eurypterid ("sea scorpion"). This specimen was found at the Ridgemount Quar...

About 60 million years ago (or so) during the Paleocene epoch, a towering coiled shell sea gastropod roamed a shallow sea that is now where...

Above is a diagram of a North African Atrypa reticularis from the Middle Devonian Period.  It is on display at the Museum of Natural Histo...