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Winter
The photo shows the fossil standing upright and the underside.
Measurements: diameter 44-55mm, height 40mm, weight 142gm
It has the colour and texture of a stone

Could it be from a sea anenome?
Click image for larger version - Name: Fossil 1.jpg, Views: 40, Size: 688.71 KB
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Barrow Museum
Your fossil is the internal cast of a sea-urchin (Echinocorys scutata) that lived in the Chalk sea some 80-90 million years ago.  Yours is preserved in flint, which is a form of redeposited silica, originating from dissolved sponge spicules, that occurs in bands within the Chalk.  A nice and complete example.
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Winter
Thank you for such complete identification. My grandson, whose 11th birthday is coming up, will be thrilled.

Winter Rose
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Gary W
A very fine Echinocorys, just look at others posted on the forum to see how good it is.
Gary
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Winter
Thank you, Gary. It's to be a birthday present for my grandson, who has long been keen on rocks and fossils. Would you know how much it might be worth?

Kind regards
Winter
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Gary W
They are very common so not worth a lot say £5   but its value lies in the fact that you found it
Gary
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