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Hence, though both sand and mud originated simultaneously, the one near the land, the other far from it, the sands in every locality where a shore became submerged might constitute the underlying deposit. Ostrea columba. Syn. Gryphaea columba. Ostrea carinata. Chalk marl and chloritic sand. Terebrirostra lyra, Sowerby. Pecten 5-costatus. White chalk and chloritic sand.
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