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Near Wenlock it consists of thick masses of grey subcrystalline limestone, replete with corals, encrinites, and trilobites. It is essentially of a concretionary nature; and the concretions, termed "ball-stones" in Shropshire, are often enormous, even 80 feet in diameter. Halysites catenularius, Linn. sp. Favosites Gothlandica, Lam. Dudley. a. Portion of a large mass; less than the natural size. b.
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