Hello Eric, I’m very glad that you chose Mearto for your online appraisal, Considering the photographs, fossil appearance, stone type and the colours, I concluded that this is a Dinocardium Sea Shell Fossil. The fossil might date back from 4 to 65 million years. The detail of the period would be revealed after a physical geological era examination. The fossil is either a member of the early Dinocardium sea shells or a close relative. The less symmetrical shape of the fossil helps as categorise and classify this piece as a Dinocardium Fossil. The piece is attach to a larger rock body and the shell is in crystallized condition. The piece was found by the current owner back in 1985. For smaller other fossils of sea life this rock could be examined further. The rock and the fossil are all in intact condition. These fossils are proofs of the earlier ocean or sea activity and areas they've previously occupied. In good condition without a visible damage. Entirely hand knotted. Dimensions: Unknown. Condition: The rock and the fossil are all in intact condition. Provenance: The piece was found by the current owner back in 1985. 20-50$. Please don’t hesitate to reach us again for more online appraisals on your precious items, thank you for choosing Mearto.