This might be a segment of the ambulacral area of a
Pentremites conoidcus blastoid has been magnified under a microscope. It is in a area about 4 mm wide. The fossil was found in the Salem Limestone of Spergen Hill Indiana. This area is known for its Mississippian Period fossils.
The identification appears to match Figure 32 found on Plate XXVI in the
Indiana Department of Geology and Natural Resources Thirtieth Annual Report, W.S. Blatchely State Geologist, 1905.
Thanks to Kenny for the fossil image.
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| Pages 1436-1437 Plate XXVI Figure 32 |
