I recently found an extremely suggestive rock that mirrors a skull with a round object fused to it’s jaw. I took it to a geologist from University of Georgia, Dr. Garrison. He estimated that it was approximately 250 million years old. He also said that it was a cast of a creature that died in sediment. The sediment filled in the organic parts and created a cast.
Do you know the age of the rock. The impression looks like it could be the mold of a horse tooth, but since that tooth morphology, did not appear in horses until the pliocene, I would need to know that it would be that age, or I would say just a mineral.