Globoblastus norwoodii and Uperocrinus pyriformis
Approx. Dimensions: 3.5 x 3.5 x 2 inches
Approx. Weight: 275 grams
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 a large crinoid fossil embedded in a matrix with dozens of other small crinoid pieces. This piece lays flat for display, or could be displayed upright with the help of mineral putty (not included).
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 contemporary relatives, the crinoids, blastoids are common fossils, especially in many Mississippian-age rocks.
Crinoids are marine animals belonging to the phylum Echinodermata and the class Crinoidea. They are an ancient fossil group that first appeared in the seas of the mid Cambrian, about 300 million years before dinosaurs. They flourished in the Palaeozoic and Mesozoic eras and some survive to the present day.
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