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Deadbeat
I found this fossil (?) in river gravel in the River Roding, Essex, just beneath Schonks' Mill on the road from Navestock to the Ongar - Passingford some years ago. Photos attached. It looks as if it is embedded in a piece of flint and from the markings on it and its' shape it looks a bit like some sort of beetle or spider. Anyone any ideas as to what it might be ? Sorry the photos are not very clear - must practice more !!IMG_0310.jpg  IMG_0316.jpg  IMG_0317.jpg 
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Barrow Museum
Exactly the same as the identification I just wrote for another correspondent, so I'll repeat:

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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prep01
I agree that it's the internal cast of an echinoid (sea urchin) but I wouldn't go as far as saying it's E. scutata. It is very squashed and we can't see the underside. You will find lots more of better quality.
Colin Huller
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Gary W
Probably is scutata as there are very few Echinocorys species defined. 
Gary
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prep01
Gary - I can't see enough of the fossil even to say it's Echinocorys!
Colin Huller
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Deadbeat
Thanks to all of you who have explained what my fossil actually is. I'm afraid my photography skills - via iPhone - need to be worked on. Next time I  make a request for identification of another find I'll make sure the photos are as clear as possible.
Anthony Ketterer
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