7.3" Agaricocrinus & Macrocrinus Crinoid Association - Indiana

This is a great association of two Agaricocrinus americanus and three Macrocrinus mundulus crinoids from Crawfordsville, Indiana. All of the specimens are very 3D and have been prepared under microscope using air abrasives. The matrix measures 7.3x5.6" and the longest crinoid (Macrocrinus) is 6.5"

Part of the long stem on one of the Macrocrinus maybe a composite from another specimen.

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.