Uncommon Crawfordsville Crinoid Association Plaque

Name: Onychocrinus exculptus: Flexibilia, Taxocrinda Parascytalocrinus validus: Inaudinata, Cladida. Scytalocrindae

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

Size (25.4 mm = 1 inch): Onychocrinus: Crown: 40 mm long by 46 mm wide stem: 45 mm Parascytalocrinus: Crown: 30 mm long by 25 mm on a 120 mm by 120 mm matrix

Location: Crawfordsville, Indiana

Onychocrinus exculptusDescription: The larger unusual crinoid is a member of the Flxibila, 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 smaller crinoid is a fine example of an Inadunate Cladid crinoid (Family Scytalocrinidae) known as Parascytalocrinus validus from the famous Crawfordsville crinoid beds. These specimens are well presented on this 120 mm by 120 mm siltstone matrix.

click fossil pictures to enlarge


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