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astrojack

Please help ID this

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astrojack

The is the first time I am posting here.  I went on a fossil hunt to the Whiskey Bridge on the Brazos River near Caldwell, Texas.  The fossils in this area are from the Crockett formation during the Eocene time period.  I found many snails and marine fossils but also came across this.  It LOOKS like bone.  Any thoughts?

Screen Shot 2020-06-30 at 7.49.34 PM.png

Screen Shot 2020-06-30 at 7.50.23 PM.png

Screen Shot 2020-06-30 at 7.50.59 PM.png

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pjullien

I'm not sure.  It certainly has an interesting pattern on the top portion of your last picture.   The one thing that for me makes me think not bone is the inner part of the object on the second picture.  I don't think that looks like bone matrix to me.  That being said...I may be totally wrong on this.  Maybe concretion but if it is a most interesting one at that.

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astrojack

Yeah, not the place I would expect to find bone too. 

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Rockwood

Maybe crustacean ? I can imagine something like a lobster claw.

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pachy-pleuro-whatnot-odon

Though I wouldn't necessarily regard the inner section of the fossil as evidence for this not being bone - some large marine reptiles like plesiosaurs have very porous/vascular inner bone that, when filled up with crystals, may end up looking rather rugose - there are two reasons why I still think this would be less likely. Firstly, you'd expect more cortical bone around the core - a lot more, to be honest - and secondly, the section seems too rugose to actually be bone. So, I guess the "no bone"-vote from me too ;)

 

The next thought that came to mind, though, is the same as @Rockwood offered: may be something crustacean? Seems rather large for a claw initially, but large crab- and lobster-species do exist. So, why not?

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GeschWhat

What is exposed does look like a steinkern. I would try to gently remove some of the crusty outer surface in order to expose appears to be a shell/carapace it to see if there is anything definitive. Welcome to the forum! :D

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astrojack

Yes, I need to do that.  I was also trying to find more of what has been found in this area that would be that big and have an outer covering like that. Cuttlefish bones have been found.  I was then thinking maybe the bone from inside organisms like that.

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