Is this tortoise shell?

[PSchleis]

One last piece for today as I clean up my finds from my trip to Myrtle Beach.

 

I have a few pieces like this and I think they are tortoise. Just wanted to confirm. Thoughts?

[SailingAlongToo]

It is possible but they look like extremely weathered bone to me.

[Pemphix]

Don't think it's tortoise shell.

It bony structure - very strong weathered bone, imho no ID possible....

[PSchleis]

1 minute ago, SailingAlongToo said:

It is possible but they look like extremely weathered bone to me.

The "marrow" is perpendicular to the surface. I'm used to seeing bone I pick up on the beach with the marrow running parallel to the surface. I'm fairly new to collecting bone so I'm no expert. I couldn't think of anything that might create that sandwich effect besides, perhaps, a carapace.

[PSchleis]

Maybe those other photos were too close. Here’s one at a distance. The marrow goes up and down, not back-and-forth. Can that happen in regular bone?

[caldigger]

Have we considered Glyptodont?

[Fossildude19]

Very worn vertebra may be a possibility, as well. 

[cck]

I’d second vertebra because of the ‘grain’ of the bone structure 

[PSchleis]

2 hours ago, caldigger said:

Have we considered Glyptodont?

Haven’t heard of that guy before. He looks interesting :-)