Crawfordsville Crinoids at ISM

If Indiana is known for a particular fossil, it has got to be the crinoids of Crawfordsville.  These prepped plates are on display on the first floor of the Indiana State Museum (October 2010).  Animals existed in the Mississippian Period.

Waldron Shale Fossils Displayed at ISM

Waldron Shale fossils on display at the Indiana State Museum (ISM). First is the index fossil of the Waldron Shale, the Eucalyptocrinites crassus crinoid calyx. 

 The next crinoid cup fossil appears to be an Eucalyptocrinites elrodi.

This third image shows the fragment of the crinoid calyx with arms of Eucalyptocrinites crassus.

 The fourth image shows unidentified crinoid arm.

Last image of the holdfast of an Eucalyptocrinus crinoid.

Arctinurus occidentalis Trilobite

 The Arctinurus occidentalis trilobite with its feathery looking pygidium is rather fragile.  Fragments are mostly found including the one pictured of the pygidium.  The fossil is on display at the Indiana State Museum (October 2010).  Trilobite existed in the Silurian Period and fossil was found in Waldron Shale.

Image of what the entire trilobite looked liked shown below.

Arctinurus Illustration at Indiana State Museum

UPDATE

This fossil was found in the Waldron Shale of Clark County, Indiana.  It is a large fragment of a small part of the Arctinurus rear section (pygidium).  Judging by the size of this fragment, this trilobite would have been the size of a small kite!

This last image is of an Arctinurus pygidium Alan found.  Thanks for letting me photograph it.