This image is of an Archaeocidaris sea urchin fossil. The animal existed in the Carboniferous Period. Fossil was discovered in Brown Count...

  This image is of a Richthofenia permiana brachiopod fossil. The animal existed in the Permian Period. Fossil was discovered in Texas, US...

This image is of an Ectocentrites petersi ammonite fossil. The animal existed in the Jurassic Period. Fossil was discovered in Kammerkaral...