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johnrr
This stone was found on the beach in Clacton, Essex about 50 years ago!  There have always been flint fossils there, but this seems to be in some fine-grained matrix, possibly from the London clay but very hard.  The patterning is over the whole surface of the two rounded fossils.  The surface isn't raised, but the patterning might be from indentations that have filled with a different material.  Sorry the picture isn't that clear!

Any ideas? 

John. DSCF7416.jpg
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henryrb
Hmm, is it possible you could take a picture of the back? [smile]
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johnrr
here's the back and end, as best as my camera will do. DSCF7423.jpg  DSCF7425.jpg 
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henryrb
maybe a sponge or coral or even some sort of concretion. I am really confused on what this might be. Maybe someone else could help? I will try to figure this one out in the meantime. [smile] 
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Dirty Pete
I see three rounded pebbles, one a liver coloured quartzite? and two quartz? pebbles with interesting dark inclusions/stains held together by a fine iron stained/silicious? matrix.
This would make it a small piece of conglomerate. I'd suggest the strange markings may have a mineral origin.  Could it be man made? Pebble dash or the like?
Just a suggestion,

Pete.
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