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Richard
Found this 10 mm wide specimen in Upper Chalk of Santonian / Campanian age.
Is it a fossil or a chalk structure? If a fossil perhaps it is Porosphaera?
Any opinions gratefully received!

SIDE VIEW
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UNDERSIDE
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TOP VIEW
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Richard
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prep01
Hi richard, it could be Porosphaera but it looks like you only have half of the mould , so a bit tricky.
Colin Huller
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Richard
Hi Coin
Thanks for your reply. I did wonder if it was a sponge that has lost the osculum end. Also wondered if it was some feature of the chalk itself?
Richard
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Richard
Sorry Colin not coin
Richard
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andy333
Hi Richard, I wonder if it may be a bryozoan from the Ceriopora family? Ceriopora ramulosa occurs in the lower chalk and looks similar.
Crossing the eyes and dotting the teas.
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Richard
Thanks Andy
My specimen was found in Upper Chalk but that may not be a problem as Ceriopora appears to occupy a wide range. Searching the internet, I found a photo of one from the Oxfordian (of France) which is quite similar to mine.
Interesting!
Richard
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