Pentremites Blastoid Indiana

Description

Blastoids are a unique group of echinoderms that existed for a very brief amount of time. They became fairly widespread and were likely filter feeders.
This specimen is a single in-situ Penthemites. The block has been cut on one side, which makes for a very nice natural base. NO RECONSTRUCTION. Combined shipping available. From an old collection.
Pentremites sp., Indian Springs fm., Sulfur, Indiana