Halysiocrinus Crinoid Fossil - Crawfordsville

This is a well preserved, 3D, Halysiocrinus tunicatus crinoid fossil from the famous Witherspoon Quarry near Crawfordsville, Indiana. It has been prepared under microscope using air abrasives. Even part of the back side of the piece has been prepared out and is viewable on the reverse side of the matrix.

Crinoids are commonly known as sea lilies, though they are animals, not plants. They are echinoderms related to starfish, sea urchins, and brittle stars. They attached themselves to the sea floor and had feathery, tentacle-like appendages which they used to capture particles of food. First appearing in the Ordovician period, 488 million years ago, they still survive to this day in deep water.