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Hi Ginger,
The black spots are most probably manganese concretions, so-called "dendrites" for their resemblance with plants.
Anywhere for little ammonites, twice as far for big ones!
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Yesterday we encountered these fossils on the foreshore at Cliffe End next to Fairlight (see photo(s). Please help identify. The embossed tubes were about 6cm long and 1cm wide.

Also encountered black spotting on a rock could this be fossilised plant material? 2014818155827_20140817_114819.jpg 2014818155945_20140817_114636.jpg  201481816359_20140817_114536.jpg 
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Although plant material can be found at Cliff End, I think the black spots in that particular rock are mineral in origin. The infilled burrows are definitely that, but as to what made them, I am unsure.
Time is nature's way of stopping everything happening at once.
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