. Elements of geology. Geology. Terebratula digcna. Inferior Oolite. Fig. Ostrea Marshii. Middle and Lower Oolite. cula (Fig. 212.), Belemnites hastatus {Fig. 213.), and Terebra- tula digona (Fig 216.) As illustrations of shells having a great vertical range, I may allude to Trigonia gihbosa (Fig. 205.), which abounds in the Portland stone of Wiltshire, and the Inferior Oolite of York- shire.* Also Ostrea Marshii (Fig. 217.), common to the Cornbrash of Wilts and the Inferior Oolite of Yorkshire; and, lastly, Orbicula refiexa (Fig. 214.) and Ammonites striatulus (Fig. 215.), fossils commo
. Elements of geology. Geology. Terebratula digcna. Inferior Oolite. Fig. Ostrea Marshii. Middle and Lower Oolite. cula (Fig. 212.), Belemnites hastatus {Fig. 213.), and Terebra- tula digona (Fig 216.) As illustrations of shells having a great vertical range, I may allude to Trigonia gihbosa (Fig. 205.), which abounds in the Portland stone of Wiltshire, and the Inferior Oolite of York- shire.* Also Ostrea Marshii (Fig. 217.), common to the Cornbrash of Wilts and the Inferior Oolite of Yorkshire; and, lastly, Orbicula refiexa (Fig. 214.) and Ammonites striatulus (Fig. 215.), fossils common to the Inferior Oolite and Lias. Such facts by no means invalidate the general rule, that cer- tain fossils are good chronological tests of geological periods; but they serve to caution us against attaching too much import- ance to single species, some of which may have a wider, others a more confined vertical range. We have before seen that, in '''See Williamson, Proceedings Geol. Soc. No. 47,. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Lyell, Charles, Sir, 1797-1875; Gibbes, Lewis Reeve, 1810-1894, former owner. DSI; Merrill, George P. (George Perkins), 1854-1929, former owner. DSI. Philadelphia : James Kay, Jun. and Brother ; Pittsburgh : C. H. Kay & Co.
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