Pyrite fossil of a sponge called
Receptaculites subturbinatus. Fossil was found in the Silurian Period Waldron Shale of Indiana. Illustrations in this post are from the Indiana Geological Survey #11 of 1881 found on Plate 2 Figures 1-3. Thanks to Mark for the fossil.
Dear Sirs, I am in possession what well may be a huge specimen of the Receptatude. I would appreciate your input. My Fossil is proving most difficult to identify. Please contact me to establish conversation. Thank You.
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