In regards to the mystery bone, I suspect turtle as well. My five minute Google search has taught me that a turtle's shell is made up of a series of bone plates that are fused together in a manner not unlike the bones of a mammalian skull. The ribs, in turn, are fused to the plates. What we appear to be looking at is one of the plates from a turtle's shell with a portion of the rib attached.
Of course, I could be wrong. I'm no expert in biology, and most of what I do know relates to arthropods (creepy crawlies).
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I wake up in the morning more tired than before I slept
I get through cryin' and I'm sadder than before I wept
I get through thinkin' now, and the thoughts have left my head
I get through speakin' and I can't remember, not a word that I said
- Ben Harper, Show Me A Little Shame
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