Fossil Blastoids (Pentremites godoni) from the Ridenhower Fm., Illinois, USA. One of the two blastoids looks to have been glued back into the matrix, the other is in situ.

Dates to the Carboniferous period (Mississippian)

Matrix: 7.4 cm x 4.5 cm x 1.5

Blastoids: 1.2 cm & 1.0 cm

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