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TFB
It looks like a leaf...

It's next to an ammonite...

but is it really?  Any opinions welcome![biggrin]


5.jpg  ...

but is it real?

Found by my wife on Charmouth beach yesterday. 4.jpg 
1.jpg 
2.jpg 


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Dirty Pete
Nice pun, could it be an aptychus? Paired aptychi even.
Cheers
Pete.
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Hydrangea

Welcome to the forum TFB.
As Pete says, it could be an aptychus from an ammonite.
The specimen does look rather beach worn, so I'm not sure an aptychus would stand up to such conditions for long. A bivalve might be another possibility??
Roy D.
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Crann
Looks like a bivalve imprint to me, especially with the Ammonite with it.
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Dirty Pete
On closer inspection the grooves seem to be curving in the wrong direction for aptychus....shame.
Cheers
Pete.
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TFB
Many thanks for the welcomes and the suggestions! 
Never having heard of an aptychus before I am very grateful for that line of thought - the lines on my "leaf" do seem to fit with other images such as:

500px-Aptychus4.jpg 
and 
Aptychus.jpg 

and of course I'm getting the idea of thinking of the "leaf" shape seen as just one potential "slice-through" random cross-section of that was originally (bi-valve or aptychus)  a three-dimensional object.

34741_aptychus2.gif 

Fascinating ideas!
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mr ammonites
Coleoptera wing case pair, rare find very rare as a pair?

Ammonite!
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