Crinoid and Blastoid Fossil Plate DX3740

Fossil Plate Approx. Dimensions: 3.25 x 2.5 x 2 inches Approx. Weight: 260 grams Dorycrinus unicornis Cryptoblastus melo Abatocrinus aequalis Mississippian period Burlington formation Marion County, Missouri Acrylic base and mineral putty are not included. From Marion County, Missouri, this is a cool plate with lovely little blastoid and two large crinoid fossils embedded in a matrix with dozens of other small crinoid pieces. This piece can be displayed upright as the base is cut flat, or can be laid flat for display. Blastoids (class Blastoidea) are an extinct type of stemmed echinoderm, often referred to as sea buds. They first appear, along with many other echinoderm classes, in the Ordovician period, and reached their greatest diversity in the Mississippian subperiod of the Carboniferous period. However, blastoids may have originated in the Cambrian. Blastoids persisted until their extinction at the end of Permian, about 250 million years ago. Although never as diverse as their