Friday mystery object #110

This week I’ve decided to give you something that’s a bit of a change from the usual skulls:

Any idea what these objects are?

As usual you can leave your questions, comments and suggestions below and I’ll try to respond during the day. Good luck!

23 thoughts on “Friday mystery object #110

  1. Mmmmm, chocolate.

    Now we’ve got that out of the way, I’ll have to wait until Monday to find out how edible they really are.

  2. Looks to me like snails who’ve accidentally come out without their shells on and are curling up in embarassment at their nudity.

  3. Yay! It’s geological! Why didn’t I look first thing?

    They’re teeth, palatal teeth to be specific. They’d sit along the roof and floor of the mouth of something, and provide a nice crushing/grinding surface.

    The matrix is chalk, so we know we’re in the sea. We’re in the neoselachii, the sharks and rays. But one of those odd things that hasn’t quite got a settled place in the tree of life, probably Ctenacanthida. But certainly, as others have said, Ptychodontidae. Ptychodus mammillaris sounds good to me, but there are quite a few species in the genus so I wouldn’t swear to it.

    Pretty big fish. Bigger than Basking Sharks (usually, there has been the odd freakishly large Basker that hits 12m).

    Lovely things.

  4. A quick Google Image search (a scientific technique if there ever was one!) strongly suggests Metal Dave has it right-o…

  5. I knew this was Ptychodus from the first glance. I’ve only been to Big Brook, NJ a few times, but I’ve studied it extensively and know the fossils pretty durn well. Ptychodus happens to be one of them. The crushing surface is the big giveaway.

    Just out of curiosity, where were these teeth found?

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