North Sulfur River turtle shell fragment?

[KimTexan]

I was out at North Sulfur River yesterday. It was terribly picked over. Do you start looking even at pieces of junk at that point. I found a couple interesting things, but not that noteworthy.

The most easily found thing out there are Exogyra oysters. So when I saw this I first thought it was an oyster fragment and almost didn’t pic it up, but it looked different like a piece of turtle shell so I picked it up and threw it in my bag.

I can see thin layering on top and a bit of what looks like the pearly surface of an oyster shell, but then I also see a tiny bit of what looks like porous bone structure on a couple edges. I think it could be a turtle shell fragment.

I’d like to hear your thoughts and opinions.

 

Top side of shell

Underside. You can see some porous portions on top right.

Porous structure. Definitely not oyster looking.

[bbrosen]

I want to say its heavily tumbled/worn shell, not Turtle. I went there Wednesday and Friday, found quite a bit. Verts, ammonites, mammoth enamel. I never really subscribe to the it's picked over line of thinking. Not everything is found, and if you are willing to go to some places others are not, you will find even more. You will have to walk a little farther, wade water and slog mud, but there is always something there...My best find was by the 2990 bridge, articulated mossasaur spine and quite a bit of other parts of him, and some one had walked within 3 feet of it while it was openly exposed

[KimTexan]

Invertebrate shell, like oyster? I don’t think invertebrates or calcium carbonate get that porosity though.

I actually have another similar one covered in mud. I have not cleaned it up to see what it looks like all around.

[ynot]

I will go with a shell piece. The holes are from burrowing critters that lived in the shell.

[Tidgy's Dad]

Oyster shells seem to often be heavily encrusted with worm tubes and bored with burrows, more than many others types of mollusc shell. 

I think oyster shell as well, i'm afraid. 

[KimTexan]

Ok thanks for the insight and comments.