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Name:
Archaeocidaris wortheni
Age: Mississippian
Formation: St. Louis Formation
Location: St. Louis, Missouri
Size: Plate is about 4 inches tall
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This is a top quality fossil sea urchin. It is a detailed Archaeocidaris wortheni from the Mississippian of St. Louis. Fossil echinoids from the St. Louis area are famous around the world and have been extremely sought-after by collectors for decades. These spiny urchins are larger than the Lepidocidaris found in the Mississippian Warsaw Formation, and are OLDER than the Pennsylvanian Archaeocidaris from Texas. This urchin is complete with MANY barbed spines still intact. Most of the types of urchins from this site have smooth spines (there are three species!), and ones with the larger Archaeocidaris wortheni are quite sought-after. The echinoid displays well on the large, squared plate of matrix. This is a very detailed example of a Mississippian echinoid from the St. Louis Formation.
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