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 Patella rugosa, Sow. Great Oolite. Nerita costulata, Desh. Great Oolite. Eirnula {Emarginula) elath- rata, Sow. Great Oolite. stead of ammonites and belemnites, numerous genera of carnivorous trachelipods appear. Out of 142 species of univalves obtained from the Minchinhampton beds, Mr. Lycett found no less than 41 to be carnivorous. They belong principally to the genera Buccinum, Pleuro- toma, Postellaria, Murex, P
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 Patella rugosa, Sow. Great Oolite. Nerita costulata, Desh. Great Oolite. Eirnula {Emarginula) elath- rata, Sow. Great Oolite. stead of ammonites and belemnites, numerous genera of carnivorous trachelipods appear. Out of 142 species of univalves obtained from the Minchinhampton beds, Mr. Lycett found no less than 41 to be carnivorous. They belong principally to the genera Buccinum, Pleuro- toma, Postellaria, Murex, Purpuroidea (fig. 405), and Pusus, and ex- hibit a proportion of zoophagous species not very different from that which obtains in warm seas of the Recent period. These zoological results are curious and unexpected, since it was imagined that we might look in vain for the carnivorous trachelipods in rocks of such high anti- quity as the Great Oolite, and it was a received doctrine that they did not begin to appear in considerable numbers till the Eocene period, when those two great families of cephalopoda, the ammonites and belem- nites, had become extinct. Stonesfield slate.—The slate of Stonesfield has been shown by Mr. Lonsdale to lie at the base of the Great It is a slightly oolitic shelly limestone, forming large lenticular masses imbedded in sand, only 6 feet thick, but very rich in organic remains. It contains some pebbles of a rock very similar to itself, and which may be portions of the deposit, broken up on a shore at low water or during storms, and redeposited. The remains of belemnites, trigonia3, and other marine * Lycett, Geol. Journ., vol. iv. p. 188. f Proceedings Geol. Soc, vol. i. p. 414.
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