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Chris G
Can you help with the species please.

Found just South of Aylesbury. Apparently the field is mainly clay with lots of flint/chert.

As always, thanks for the help.

Chris Click image for larger version - Name: Screen Shot 2020-04-07 at 21.18.47.png, Views: 37, Size: 689.96 KB Click image for larger version - Name: Screen Shot 2020-04-07 at 21.18.29.png, Views: 35, Size: 1.67 MB
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Barrow Museum
It's the bivalve Inoceramus sp (which species I cannot say).  It is preserved in flint so therefore not from the bedrock just south of Aylesbury, which is Gault Clay from Walton all the way to the outskirts of Wendover.  I can suggest that it is in material left behind either from the very edge of the Anglian ice sheet, or from recession of the chalk scarp.  Of course, being originally from a flint band in the Upper Cretaceous Chalk, it is going to be around 90 million years old.  In the Chilterns, flint is absent from what used to be commonly known as the Lower Chalk, but picks up higher in the Middle Chalk, to become common in the Upper Chalk.  Yours must have come from the Middle or Upper division, unless it was carried down by ice from Lincolnshire or further north.  It is an unusually good example.
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Chris G
Hi Barrow Museum,

what a superb reply - thank you. I was expecting a few words with the ID. Instead, this just shows the depth of knowledge and willingness to share of the people behind this forum - and that's what makes for a good forum.  Again, thank you for your time and knowledge.

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