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Sharktooth Hill limb bone...turtle?


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Beside all the bone fragments I've seen from Sharktooth Hill, this one really stood out. I'm hoping that the relatively good condition it is in will allow for identification. Taking a swing at it, I'll say turtle but definitely not too sure. All 3 pics are the same bone. Thanks!  





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Yes, I think it's a femur of an immature sea turtle and most likely a leatherback (hard-shelled sea turtles are present in the STH Bonebed but rare).  The bone ends were active sites of bone growth so they tend to be found eroded like that.  The turtle died before its limb bones were more fully formed.  It's a good find because turtle bones are uncommon there.  You're more likely to find an isolated ossicle of the leatherback.

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