Spectacular Double undescribed species and ONYCHOCRINUS ulrichi


1 in stock


Great Museum Quality spectacular detail double crinoid plate, an undescribed crinoid species and an ONYCHOCRINUS ulrichi Crinoid with stems from a classic site in Indiana.

Crinoids from this site are preserved in SPECTACULAR detail. Because of the wide variety and number of these crinoids it is also assumed they lived in dense communities,

Crinoids look like plants and are also called “sea lilies,” but crinoids are actually animals related to modern day starfish. They are echinoderms. They have modern relatives living in the deep oceans today however then they lived in shallow salt water seas and lagoons. They lived during the paleozoic and were most prevalent during the Mississippian Period, which is sometimes known as the “Age of Crinoids.”

Although there were many species of crinoids, they shared a basic body styles consisting of a stem by which it anchored to the sea floor with a “holdfast”, a calyx or cup which enclosed soft body tissues, and arms and pinnules which filtered food from the water.

Crinoids thrived in the warm inland sea that covered the area during the Mississippian Period some 340 million years ago. The crinoids living near what is now Crawfordsville were established near a delta system that periodically buried the colonies in silt. This silt eventually hardened into stone that preserved the Crawfordsville crinoids in glorious detail.

This Crinoids are 2 and 1 5/8 inches long and sit on an irrectangular matrix  3 1/4 x 3. It has been meticulously prepared using air abrasive technology,

Undescribed Species and
Mississippian Period
Edwardsville Formation
Montgomery County, Indiana

This is the specimen you will receive.