1.7" Holocystites Sp Crinoid In Matrix Fossil Silurian Age Osgood Shale Napoleon Indiana Coloborhynchus displaying striking morphological similarities to

displaying striking morphological similarities to modern crocodilians—a textbook case of convergent evolution

these fierce swimmers lived entirely underwater

The species is easily recognized by its hollow cranial crest

and a remarkable plant assemblage of over 325 identified leaf

1.7" Holocystites Sp Crinoid In Matrix Fossil Silurian Age Osgood Shale Napoleon Indiana Coloborhynchus displaying striking morphological similarities toLocation: Osgood Shale, Napoleon, Indiana Weight: 8. 7 Ounces Dimensions: 3. 9 Inches Tall, 2. 3 Inches Wide, 1. 1 Inches Thick (Matrix) Crinoid Dimensions are: 1. 7 Inches Tall, 0. 8 Inches Wide The Item Pictured is the one you will receive. Holocystites Sp Silurian in age (420 million years old) Holocystites is an extinct genus of echinoderms belonging to the class Cystoidea and sub phylum Blastozoa. These organisms thrived during the Paleozoic Era,