Eagle Ford,Cenomanian aged shelll or bone? Approx. 3/4" square.

[claire01]

Any idea if this is bone or shell?  What might this be?  Any help is very much appreciated. About 3/4" square. Thanks!

[Al Dente]

It looks like bone to me. I'm guessing fish vertebra.

[claire01]

Lots of interesting things going on in this approx. 7 x 4 inch piece I found this morning while walking the dogs.  Here are a couple more views:

 

[-AnThOnY-]

Looks like the cross section of a fish vertebrae to me as well. Also an echinoid underneath it with some interesting bits inside it.

[claire01]

Thank you very much!  Just wanted to be sure. 

[fifbrindacier]

I agree with AnThOny and Al Dente. In the third photo i think you have an ammonite (in the center). And on the second photo, at the upper left there might be another one. But i am newbie, so let's wait for other's opinion.

Nice finds.

[abyssunder]

Not clearly visible in the pictures what is there, but considering that Eagle Ford Fm. contains also brachiopods, I would adventure in the possibility of a brachiopod section through the valves showing the spiralling lophophore in the middle.

http://www.mcz.harvard.edu/Departments/InvertPaleo/Trenton/Intro/PaleoPage/Terminology&Morphology/Terminology&Morphology.htm#Brachiopoda

[claire01]

Interesting!  

[fifbrindacier]

On 15 septembre 2016 at 9:41 PM, abyssunder said:

Not clearly visible in the pictures what is there, but considering that Eagle Ford Fm. contains also brachiopods, I would adventure in the possibility of a brachiopod section through the valves showing the spiralling lophophore in the middle.

http://www.mcz.harvard.edu/Departments/InvertPaleo/Trenton/Intro/PaleoPage/Terminology&Morphology/Terminology&Morphology.htm#Brachiopoda

I can't see of what part you are speaking, could you show us, please ?

[abyssunder]

I thought that the circled with red might be. (?)

 

[claire01]

I'm guessing metoicoceras ammonite, but it's probably hard to say without cleaning it up a bit, abyssunder.

[DPS Ammonite]

Clair, what part of the Eagle Ford Group did you find this in? There are 4 formations.

 

I think that the large feature in the lower right portion of your rock is a cross section of an Inoceramid because the thin shell has parallel prisms that are normal to the shell.

 

 

The shell also shows a wavy form that could be that from the concentric ridges of an Inoceramid.

 

It is not a brachiopod because it is too big (about 4 inches according to your mention that the rock is 4 inches across). Most brachiopods in the North Texas Cretaceous rocks are 1 inch or less across. It is not an echinoid because most echinoid shells are show flat calcite cleavage and are not fibrous.

[claire01]

The Britton, I'm told.  I generally find clams, ammonites, crabs and fish material.  

[fifbrindacier]

Beside the ammonite Abyssunder circled in red, on the right, i see a shape that make me think there may be another cephalopod.

It is a very rich plate (i hope this is the right word), full of interesting things.

[claire01]

Yes, I think so too!  And a couple of other features look promising as well. I'll try to carefully clean it up a little more and see what I find.  I'll post more pics if I manage to uncover anything interesting.  Thanks everyone for sharing your expertise, I appreciate it very much.