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I have a fossil hunting friend, who keeps very little of what he finds. Anything that has serious issues goes back to the fossil gods or into the bone garden at home. To make it into his collection, it must be exceptionally good. I am not like that... I keep almost everything... to analyze and toss later maybe, but initially keep it. He keeps very few fossils, which has its advantages. We sort of have a deal... anything he does not want (in certain categories) he saves for me.. I do what I can to repay the kindness. One of those categories is whale: He gave me this one last week It is a 4.25 inch Florida whale tooth, likely Kogiopsis. My question relates to the composition. The species seems to have no enamel, so originally this was dentine, surrounded by cementum. It is a land find from a construction site in Florida. I have similar teeth with this composition from the Bone Valley phosphate mines. To show a different Kogiopsis tooth, found in the Peace River, with a different composition: It is what I call "hard" composition... So the questions: 1) Is this composition unique to Florida? Do other TFF members who find whole/broken whale teeth (or any other fossil) have this type of composition in their fossil collections? 2) What is the composition and the process that creates it? Thanks, Just driven by curiosity. Jack