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Schizodus Schlotheimi, Geinitz. The hinge of Schizodus truncatus, King. Mytilus septifer, King. Syn. Modiola acuminata, Sowerby. This formation is seen upon the coast of Durham and Yorkshire, between the Wear and the Tees. These shells occur at Hartlepool and Sunderland, where the rock assumes an oolitic and botryoidal character. Some of the beds in this division are ripple-marked.
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