Crinoid Calyx Fossil Macrocrinus mundulus

This crinoid calyx fossil is called Macrocrinus mundulus (Hall). It dates to the Mississippian Period and was found Keokuk of Warsaw, Illinois, USA.

The fossil is part of the Indiana University Department of Geology collection.

Thanks to Kenny for image.

Paraconularia missouriensis Fossil

This fossil is part of the Indiana University Department of Geology collection. It appears to be a Paraconularia missouriensis (Swallow). The approximately 13.5 cm long fossil was found in Washington County, Indiana, USA. The specimen dates to the Mississippian Period.

Thanks to Kenny for the image.

Crinoid Fossil Pentacrinus briareus

This large fossil plate contains the remains of the crinoid Pentacrinus briareus. It was found in Lyme Regis, county Dorset, England. The fossil dates to Lower Lias of Lower Jurassic Period. Dimensions of the plate are about 16 cm by 15 cm.

It is part of the Indiana University Department of Geology collection.

Thanks to Kenny for image.