What The ????? From Georgia.

[Indian Steve]

I found this many years ago in a creek in southwest Georgia. Any ideas? It is about 3 inches by 2 inches. Creek was full of cretaceous period fossils.

 

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[Ninjafossils]

The interlocking formation is reminiscent of an ammonite, but the shape is so peculiar. Not really sure, but I would put confidence in thinking it's just some minerals and calcite crystals.

 

[bone2stone]

The interlocking formation is reminiscent of an ammonite, but the shape is so peculiar. Not really sure, but I would put confidence in thinking it's just some minerals and calcite crystals.

I do believe you are correct that it is a species of cephalopod.
To me it looks like a species of Turrilites.
That would explain the peculiar twist.

Those are definitely suture patterns.
Obvious lobe and saddle structure.

Jess B.

 

[austin]

worm burrows...

 

[Ninjafossils]

worm burrows...

What makes you think that Austin

 

[bone2stone]

What makes you think that Austin

Ditto, what makes you think worm burrows!!!!!
Those are without a doubt suture patterns.
Calcite crystal replacement. Beautiful stuff polished.

Jess B.

 

[WolfmoonX]

Me being in the saltwater aquarium hobby, I was instantly reminded of Nudibranch or sea slug. Especially the Doriprismatica atromarginata. I am in no way an expert in fossils. I just figured it might be worth mentioning just in case.