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Hadr
Ok probably not but here are the candidates.

1. Found on Brighton beach.
DSC_0140.jpg  DSC_0141.jpg  DSC_0157.jpg     

2. Found in Brighton beach:
DSC_0149.jpg  DSC_0150.jpg 





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prep01
Hello and welcome to the forum. I'm afraid that these are only flints weathered out of the chalk. It is possible that they are parts of burrows though and they were formed 80 - 85 million years ago. Below is an interesting article which may help you.

2014+Mortimore+on+Flint.jpg 

Rt clk . open in new tab > enlage to read.
Colin Huller
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Gary W
Looks like a flint to me
Gary
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Chalkers
Hi,

Both are flint pebbles I'm afraid. The top photo has flint 'banding' which is commonly mistaken as a fossil feature. The brown and white colour is a result of the flint pebble having been exposed to the air and it's resultant weathering; the shape is a result of erosion caused by transportation and wave action. The shingle beach at Brighton is made up of almost entirely flint pebbles that were originally derived from the Cretaceous Chalk of Sussex.

Happy future hunting though!
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Hadr
Thank you very much. I'm nevertheless happy to know where these features come from. These things always seem mysterious to me. I have found a negative fossil of (what I think is) a sea urchin in that very same spot:
DSC_0130.jpg  DSC_0132.jpg 
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Chalkers
Certainly is a sea urchin (echinoid); a good find. The original calcite fossil has been eroded out of the flint leaving behind a mold of the animal. The fossil is a regular echinoid (as opposed to irregular) and would've belonged to the white chalk subgroup in the geological unit previous known as the 'upper chalk' probably somewhere between around 85 and 90 million years old (or thereabouts).
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Hadr
Thank you very much. That's great to know how long ago this animal existed! [smile]
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