Elements of geology, or, The Elements of geology, or, The ancient changes of the earth and its inhabitants as illustrated by geological monuments elementsofgeolog00lyel Year: 1868 Ieasircea oblong a, M. Edw. and J. Hairne. As seen on a polished slab of chert from the Portland Sand, Tisbury. Fiff. 3S2. Trigonia gibbosa. i nat. size. a. The hinge. Portland Stone, Tisbury. The Kimmeridge clay consists, in great part, of a bituminous shale, sometimes forming an impure coal, several hundred feet in thickness In some places in Wiltshire it much resembles peat; and the bitu-

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