Pyrite Bellerophon Fossil

This pyrite gastropod fossil has well defined ridges that make it easier to identify. It appears to be a Bellerophon. It was found in a coal mine at a depth of 60-250 meters.

My identification source is Fossils of Ohio (Bulletin 70, Rodney M. Feldmann Editor, State of Ohio, Department of Natural Resources, Division of Geological Survey, Columbus Ohio 1986) pages 162-173, figures 15-16 of specimen from Cambridge shale (Conemaugh Group, Pennsylvanian) New Concord, Guernsey County Ohio, OSU 46696.

The fossil was situated above the coal seam so it might be from the Pennsylvanian Period (late Carboniferous). It was found in Webster County Kentucky USA. The mines there are part of the Eastern Interior Basin. The formations found there are Sturgis, Carbondale, and Tradewater. The limestone layers are Carthage, Madisonville, Providence, Yeargiss?, and Lead Creek.

Learn more about the geology of this area at the United States Geological Survey:
http://pubs.usgs.gov/pp/p1151h/penn.html

Cyrtolites ornatus Monoplacophoran Fossil

UPDATE (01/27/2010): After cleaning this fossil off some more I changed its identification to Cyrtolites ornatus (Conrad, 1838) after the undulation (definition: having a wavy or curving form) were revealed by sand blasting.  If I can get more of the matrix off, this will be a very nice looking fossil.  The keel shape going down the center has a very nice form.  Thanks to Kenny for alerting me to what this fossil really was.

UPDATE(09/18/2021): After doing some research on another fossil I realized I had this fossil genus spelled wrong. Name has been corrected. Add name of person who named species and classified as a monoplacophoran.

ORIGINAL POST:
Here are some Bellerophon fossils I found in the Kope Formation in Carroll County, Kentucky.  Until now, I have not found growth line patterns found on the shell.  Usually, I just find a smooth shell pattern with the ridge line running the length of the shell.  A Cyclonema fossil is attached to the Bellerophon.

It is a neat find and I hope to clean with air abrasion sometime to reveal the growth lines.

This Bellerophon mold is typical of the ones I find at Ordovician Period road cuts around the Louisville area. It has a nice whirl at one end of the fossil.