This is my 500th blog post and to mark this milestone I will post some of the most popular fossils by Internet visits and then post a few im...

My friend Dave has sent me some images I can use in posts.  I am using two for this today's fossil.  They are of a Devonian Period trilo...

Engraving from Pioneers of Science in America , Edited William Jay Youmans D.Appleton and Company, New York 1896 The Louisville Sc...