Crinoid Calyx Eucalyptocrinus crassus

"This Crinoid Calyx is from Eucalyptocrinus crassus. The calyx is the part of the crinoid that joins the feeding arms and holds the mouth of the crinoid. It is called the aboral cup. It connects to the stalk or stem. This fossil was alive during the middle Silurian Period and is about 424 million years in age. It was found in the Waldron Shale Formation. This is a sample of our inventory your crinoid calyx will be very much like the one pictured here. They range in size from 1.5 inches to 2.5 inches.