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What rock is it ?


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Haitch
Hi, I know nothing about Geology/Fossils IMG_0006.JPG 

I found this rock in a stream on the edge of the North Pennines,  it has  two indentations and was wondering how they got there  ?? any help is much appreciated.

The size of the rock is approximately 300mm x 230mm, the indentations are 17 mm and 12mm

Thank you


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prep01
Hello Haitch and welcome to the forum. This looks likes they may be either the moulds left by a bivalve shellor they may be part of the shell itself. It's hard to tell from the photo.
Colin Huller
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Haitch
IMG_0010.jpg 
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prep01
That now looks like there is shell in there

Colin Huller
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Kosmoceras

Doesn't look like a shell to me; I think it is more geologic rather than biologic.

 
Regards,
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Tabfish
The 'blunt end' of a Belemnite Phragmocone?

Tabfish
Tabfish at the Waterside
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beatpete
Or maybe a couple of harder nodules?
Beatpete
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Anywhere for little ammonites, twice as far for big ones!
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Liara_Tsoni
My first thought was a bullet mark but I don't think it's possible. The rock itself is in too good condition with no marks. I agree with Mr. Kosmoceras  that it looks more geologic than biologic.
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