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I have recently been blessed to acquire some excellent Shark Tooth Hill (STH) marine mammal teeth. Not totally happy on not knowing what exactly I have, I am reaching out to STH experts to enhance my knowledge and understanding (but mostly to identify these fossil). One TFF member who has extensive knowledge of STH is @ynot because he sent me matrix and micros from STH. So, Tony please invite other STH enthusiasts to assist here. After spending time looking at the Pinnipeds: Seals, Sea Lions, and Walruses teeth, both fossil and modern, I am confused about a lot of things: Here is one of my teeth to ID: Seems easy, 25 mm Seal molar.... or is it ? On a $$ForSale website , I see this STH Sea Lion tooth -- molar ? that at 1.25 inches looks the same.. So do Seals and Sea Lions have the same/similar teeth only larger? Here are 3 teeth where I would be pleased with confirmation, identification, alternate possibilities. Is this incisor an incisor or a molar ? Is it the approximate size of a seal incisor? A harbor seal's incisors for comparison. Here are the canines of a Weddell Seal... At 38 mm, Can this canine be Seal, maybe lower jaw.... Lots of questions, Hopefully will trigger a good discussion.. Jack