What is this?

[Section10]

I found this last summer in a block of limestone. It looks like a fossil, but I have my doubts and haven't been able to decide. Thanks for any information.
Jim

 

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[fossis]

Welcome Section10, Limestone is usually 'chock full of fossils', this looks like a 'Nautiloid', ( ancient shelled Cephalopod), having an external chambered shell either straight or curved or coiled.
The locals in some African countries make a living, quarring, & polishing these fossils,plus Ammonites for export.

HH, Fossis..............

 

[irbaddadjoe]

I agree with fossis section10. Welcome to Tnet.

 

[futzman]

I found this last summer in a block of limestone. It looks like a fossil, but I have my doubts and haven't been able to decide. Thanks for any information.
Jim

Ditto with the others. It's a cephalopod. How big is it?

 

[Section10]

I'd estimate at least a foot long. Maybe a little more.