On a recent trip to Pennsylvania, my cousin was able to see a collection of fossils. This picture is of one of them. The creature was an ear...

Trigonarca matheroniana  (d'Orbigny, 1844) is a pelecypod fossil. This genus might be known as Arca (Linnaeus, 1758). It existed during...

Pterotrigonia vaelsiensis  (Boehm, 1884) is a pelecypod fossil. It existed during the Cretaceous Period (about 120-70 million years ago ). ...