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My brother and I found this fossil shark tooth in the gravel beds along Firesteel Creek near Mitchell, SD. We have gone several times and found many shark teeth but to my knowledge, this is the first Hemipristis serra that we found. I believe this tooth has been worked by Native Americans. There is a perfectly circular hole in the root - or it would be circular if part of the tooth weren't broken away. I have read that worked fossil shark teeth from the Chesapeake Bay, including Hemipristis serra, have been found in burial mounds as far away as Ohio. My questions are: do you agree that this tooth has probably been modified by prehistoric people? How widely distributed is Hemipristis in North America? Is it likely to have been found and worked on site or might it have been traded from the east coast?