Saturday, March 1, 2014
This fossil appears to be a Bickmorites bickmoreanum nautiloid. It was found in the Silurian aged Louisville Limestone layer of Jefferson County, Kentucky, USA. Cephalopod fossils like this are pretty rate to find in the Louisville area.
Thanks to Kenny for letting me take pictures of it. Note some images have been darken in Photoshop to allow better contrast of chamber lines in fossil. Also fossil has been coated with sealer giving it a wet look.
Here is a link to a picture of one at Yale found in Indiana: http://www.yale.edu/ypmip/taxon/ceph/19158.html