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Unclassified tooth #3
The photo shows a small (5/8 inch) unclassified tooth probably from the genus Caseodus. 
Approximate Age: 
310-312 million years old. 
Location of Discovery: 
Peabody Coal Co. Marissa Mine
Washington County, Illinois
Unclassified tooth #4 
The photo shows a very small (11/16 inch)
unclassified tooth.  It is possibly a lateral tooth from the shark Caseodus basalis. the top picture is a coronal view, and the bottom picture is from below. The tooth is so small that an oblong piece of shale was left attached to the tooth to facilitate handling.
Approximate Age:
310-312 million years old.
Location of Discovery: 
Peabody Coal Co. Marissa Mine
Washington County, Illinois
Unclassified tooth #5 
The photo shows an unclassified tooth probably from the genus Caseodus.
Approximate Age: 
310-312 million years old.
Location of Discovery: 
Peabody Coal Co. Marissa Mine 
Washington County, Illinois