A Manual of Elementary Geology / or, The Ancient Changes of the Earth and its Inhabitants as Illustrated by Geological Monuments

by Sir Charles Lyell

Pleurotomaria ornata. Ferruginous Oolite, Normandy. Inferior Oolite, England.

As illustrations of shells having a great vertical range, I may allude to Trigonia clavellata, found in the Upper and Inferior Oolite, and T. costata, common to the Upper, Middle, and Lower Oolite; also Ostrea Marshii ([fig. 300.]), common to the Cornbrash of Wilts and the Inferior Oolite of Yorkshire; and Ammonites striatulus ([fig. 301.]) common to the Inferior Oolite and Lias.

Fig. 300.

Ostrea Marshii. ¹/₂ nat. size. Middle and Lower Oolite.

Fig. 301.