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 400 KELLOWAY ROCK. [Ch. XX. clay,' sometimes not less than 500 feet thick. In this there are no corals, but great abundance of cephalopoda, of the genera Ammonite and Belemnite. (See figs. 398, 399.) In some' of the finely lami- Fk Bel&mnites hastatus. Oxford clay. nated clays ammonites are very perfect, although somewhat com- pressed, and are frequently found with the lateral lobe expanded on each side of the openi
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 400 KELLOWAY ROCK. [Ch. XX. clay,' sometimes not less than 500 feet thick. In this there are no corals, but great abundance of cephalopoda, of the genera Ammonite and Belemnite. (See figs. 398, 399.) In some' of the finely lami- Fk Bel&mnites hastatus. Oxford clay. nated clays ammonites are very perfect, although somewhat com- pressed, and are frequently found with the lateral lobe expanded on each side of the opening of the mouth into a single horn-like projec- tion (see fig. 399). These were discovered in the cuttings of the Great Western Railway, near Chippenham, in 1841', and have been described by Mr. Pratt (An. Nat. Hist., Nov. 1841). Fig. 399. Ammonites (Jason, Eeinccke. Syn. A. fflizabethce, Pratt). Oxford clay, Christian Malford, Wiltshire. Similar elongated processes have been also observed to extend from the shells of some belemnites discovered by Dr. Mantell, in the same clay (see fig. 400), who, by the aid of this and other specimens, has been able to throw much light on the structure of this and other sin- gular extinct forms of cuttle-fish.* Kelloway Hock.—The arenaceous limestone which passes under this name is generally grouped as a member of the Oxford clay, in which it forms, in the south-west of England, lenticular masses, 8 or 10 feet thick, containing at Kelloway, in Wiltshire, numerous casts of am- monites and other shells. But in Yorkshire this calcareo-arenaceous formation thickens to about 30 feet, and constitutes the lower part of See Phil. Trans., 1850, p. 393; also Huxley, Memoirs of Geol. Survey, 1864.
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