1.7" Holocystites Sp Crinoid In Matrix Fossil Silurian Age Osgood Shale Napoleon Indiana Coloborhynchus an iron-magnesium silicate mineral responsible

an iron-magnesium silicate mineral responsible for its striking dark appearance and substantial density

The species is easily recognized by its hollow cranial crest

this temnospondyl amphibian had a large triangular head with eyes positioned high and toward the front of the skull — an ideal arrangement for spotting prey while remaining mostly submerged

contributing to its global availability and appreciation

1.7" Holocystites Sp Crinoid In Matrix Fossil Silurian Age Osgood Shale Napoleon Indiana Coloborhynchus an iron-magnesium silicate mineral responsibleLocation: 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,