Uintacrinus socialis

"Colony of stemless crinoids"
Cretaceous
Niobrara Formation Smoky Hill Chalk
Gove County, Kansas

Impressive slab of 7+ crinoid calyxes; two have arms 4” to 6” long. Colony is in excellent condition with good detail. Matrix measures 31" wide x 23" tall. Uintacrinus is the rarest invertebrate from the chalk beds and possibly one of the rarest of all described species from the chalk formation. Only one zone produces these crinoids out of over 800 feet of chalk sediment. This is a wonderful and historically significant Kansas chalk fossil.

#3496