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nklyco
A48A4845-37DC-45F6-B9C8-383C22F80B0D.jpeg  6D473314-2E07-43C9-9F03-D688493BBDF6.jpeg  FA69EF27-2C5A-42C1-B9E7-27CBDA01C2B7.jpeg  65B6B615-0A46-49FC-BE93-9F2C4312C59F.jpeg  5DDE188D-2F9E-4EE7-B18B-29CF29A19A23.jpeg  I found this spiral shaped object while walking a road above Shillingstone. The road is just above the old Shillingstone lime works on the hill across the valley from Hanmbledon Hill. It seems unusually spiraled to be anything made my humans, though I have no idea.

It seems to be another type of stone encased in limestone. I tried using vinegar to take away some of the lime, but it is a slow going process. It doesn't seem to be a gastropod since it isn't a flat spiral. From some rudimentary searches it seems like it could be something like coprolite or a concretion? I've added a photo with a normal size credit card for scale.

Please let me know if you have any clue as to what it is!
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Dirty Pete
Gastropods aren't flat spirals, maybe you're thinking of ammonites? I'd stick with gastropod (snail shell) Natica.sp or similar. It does look like a joke turd however.

Pete
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nklyco
Maybe the other apes beat us to the joke poo craze?
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prep01
Not sure of it's age or the type of matrix, but it looks like the internal cast of a gastropod to me
Colin Huller
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Brittle Star
I agree Colin  
If you use vinegar I think you will lose the cast altogether as it will be the same rock
JW

 Never ask a star fish for directions
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Dirty Pete
Looks chalky and there's plenty of Cretaceous thereabouts. No apes or joke shops in those days so I'll stick with gastropod.

Pete.
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prep01
Janet - it might be a phosphate cast as a lot are from the Cenomanian / Turonian.
Colin Huller
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nklyco
Thank you all for your opinions (and jokes)! Maybe I will take it to a gem or fossil shop and see if they think there may be different rock or material underneath. I certainly don't want to just erode it away if it is just the casting left over.
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andy333
I think it is a gastropod. I have one similar which I think is Leptomaria sp. This one is from the upper cenomanian (lower chalk) of East Devon.
IMG_20200123_145742.jpg 
Crossing the eyes and dotting the teas.
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nklyco
Wow! That looks very similar! Did you clean away the surrounding chalk yourself? If so, with what type of tools/technique?
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andy333
Yes prepped it with air pen and scalpel very slowly, a little at a time between soaks in water. Mine is an internal cast. The shell was absent, still pleasing though. 
Crossing the eyes and dotting the teas.
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