This is an exceptional ICTHYOCRINUS crinoid calyx and stem from the Rochester Shale of New York.
These crinoids were collected decades ago and just recently prepared by our prep lab..
Here is a Super detailed crinoid from a classic site in NY.
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 Silurian Period some 420 million years ago. The crinoids living near what is now Middleport New York were established near a delta system that periodically buried the colonies in silt. This silt eventually hardened into stone that preserved the crinoids in glorious detail.
This Crinoid has exceptional detail . It is 1 3/4 by 1 1/2 inches wide. It has been meticulously prepared using air abrasive technology. There is a repaired crack through the crinoid.
ICTHYOCRINUS lavies (Conrad) 1842
Rochester Shale Formation
Middleport, New York