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Name:
Archaeocidaris illinoisensis
Age: Mississippian
Formation: St. Louis Formation
Location: St. Louis, Missouri
Size: Urchin is 2 inches across w/spines
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This is a wonderful Archaeocidaris illinoisensis 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 NO spines preserved, and ones with the barbed spines are unusual. The echinoid displays very well on the large, natural plate of matrix that also has a large, excellent urchin on the back side! This is a top quality example of Archaeocidaris illinoisensis from the St. Louis Formation.
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