Uncommon Crawfordsville Crinoid Onychocrinus ulrichi

Onychocrinus ulrichi

Flexibilia, Taxocrinda

Geological Time: Lower Mississippian Osagean Stage (345 m.y.a)

Size: Crown: 15 mm long by 20 mm wide stem: 12 mm on a 43 mm by 40 mm matrix

Fossil Site: Crawfordsville, Indiana Crinoids

OnychocrinusDescription: This unusual crinoid is a member of the Flexibilia, or flexible crinoids known as Onychocrinus exculptus. These alien-looking crinoids derive the group name for obvious reasons. Crinoids such as these are easily disarticulated, but this one is quite intact, preserved in a fine 3-D aspect. The reverse of this plaque is a “hash” of stem parts, often all that remains of these wonderful echinoderms.

click fossil pictures to enlarge

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