EXTINCTIONS- VERY COOL ONYCHOCRINUS / MACROCRINUS CRINOID FOSSIL- GREAT DISPLAY!

Description

Name
:   Onycho
crinus ulrichi, Macrocrinus mundulus
Age:
Mississippian
Formation:
Edwardsville Formation
Location:
Crawfordsville, Indiana
Size:
Plate is 6.5" across,
Onychocrinus is 3.2" long
!
This is a very nice double crinoid specimen from the Mississippian beds of Indiana. On the left side of the plate is a large crinoid in the "starburst" position. This flexible crinoid is Onychocrinus ulrichi. This type of crinoid has a multi-plated base with five stout arms that branch only once near the tips. The arms of this crinoid have tiny ramules that aided in the food-gathering process. A portion of four of the five arms have been painstakingly prepared in a free-standing position - wow! The crinoid on the right side of the slab is Macrocrinus mundulus. This camerate crinoid has a cone-shaped cup comprised of many plates and slender, unbranched, biserial arms. The long anal tube extends above the feathery arms on this crinoid. A lengthy portion of stem is still attached to the cup. The ancient echinoderms are very 3-D and exhibit fine plate structure. The fossils have very good color and contrast and are very well showcased on the rectangular plate of siltstone. This is a very displayable specimen of two different types of crinoids from Crawfordsville.
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