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 Cardium striatulum. Kininieridsre clar, Hart-well. Ostrea deltoklea. Kimmeridge clay. -J nat. size. GrypTicca (Fxogyra) vir- gula. Kimmeridse clav. Fig. 3SS. also met with in the same clay near Oxford, is so abundant in the Upper Oolite of parts of France as to have caused the deposit to be termed ' marnes a gryphees virgules.' Near Clermont in Aro-onne, a few leagues from St. Menehould, where these indurated marls
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 Cardium striatulum. Kininieridsre clar, Hart-well. Ostrea deltoklea. Kimmeridge clay. -J nat. size. GrypTicca (Fxogyra) vir- gula. Kimmeridse clav. Fig. 3SS. also met with in the same clay near Oxford, is so abundant in the Upper Oolite of parts of France as to have caused the deposit to be termed ' marnes a gryphees virgules.' Near Clermont in Aro-onne, a few leagues from St. Menehould, where these indurated marls crop out from beneath the gault, I have seen them, on decomposing, leave the surface of every ploughed field literally strewed over with this fos- sil oyster. The Trigonellites latus (Aptychus, of some authors) (fig. 388) is also widely dispersed through this clay. The real nature of the shell, of which there are many species in oolitic rocks, is still a matter of conjecture. Some are of opinion that the two plates formed the gizzard of a cephalopod; for the living Nautilus has a gizzard with horny folds, and the Bulla is well known to possess one formed of calcareous plates. The celebrated lithographic stone of Solenhofen, in Bavaria, be- longs to one of the upper divisions of the oolite, and affords a re- Trigonellites latus. Fvknmeridge clay.
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