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Wini1
Hi,
is this a concretion formation, with Limonite? It was found after deep excavation on a building site. It was in one piece but split probably due to it being exposed to the sun.
thanks

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Dirty Pete
Hi Wini1
Looks like a fossiliferous, ferruginous limestone cobble with an oxidised outer crust, looks a bit chalky in parts, also calcite crystals have formed in some of the bivalve voids. Could be a concretion but you'd need to see its relationship to the host rock to be sure, I guess its too late for that.....

Pete
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prep01
Hi, I agree with Pete.
Colin Huller
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