EXTINCTIONS- NICE MULTIPLE SPINY ARCHAEOCIDARIS URCHIN ECHINOID FOSSIL- ST LOUIS

Description

Name
:   Archaeocidaris illinoisensis (2)
Age:
Mississippian
Formation:
St. Louis Formation
Location:
St. Louis, Missouri
Size:
Plate is 4.2 inches across!
This is a very nice US echinoderm fossil. It is a large plate with two complete Archaeocidaris illinoisensis urchins 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. Both of the urchins have many barbed spines still intact, which is very collectible and aesthetic. The distinct echinoids display very well on the large, natural plate of matrix. This is an excellent example of an Archaeocidaris multiple plate from the St. Louis Formation.
A Certificate of Authenticity from EXTINCTIONS.com is included with this item.
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