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"This Blastoid head or theca is from Pentremites pyriformis. The theca is the part of the blastoid that holds the mouth, anus, and respritory function. It connects to the stalk or stem. Blastoids are echinoderms related to sea urchins, starfish, and crinoids. This fossil was alive during the Missippian Sub Period of the Carboniferous Period.It is about 325 million years in age. It was found in the Indian Springs Shale Formation, from Crawford County, IN,. This is a sample of our inventory your blastoid theca will be very much like the one pictured here. They are just under 1 inches long.

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