21" Wide Slab Of Fossil Starfish, Brittlestars, Crinoids & Corals

This is a large, 21 x 15.5" mortality plate representing the sea floor some 450 million years ago. It is covered with fossil brittle stars (Ophiura sp) and corals, along with a large fossil starfish and two small crinoids. A really fascinating association piece. The detail on the starfish which measures 4.4" wide is amazing.