Picture of three casts of dinosaurs.  The fossil casting on the left is a Protoceratops andrewsi of the Late Cretaceous Period (85-80 mya...

A Pachychormus bollensis fish fossil from the early Jurassic Period (195 million years ago) of Germany.  Displayed at the Smithsonian Mu...

This post is an update on a Silurian Period Calymene trilobite fossil I have been preparing.  This first image shows a lot more of the si...