. Elements of geology. Geology. 254 LYELL'S ELEMENTS OF GEOLOGY. Corals and Shells of the Mountain Limestone. general, more widely from living forms, some being generically distinct from all those found in strata newer than the Coal. In this number may be mentioned Orthoceras, a siphuncled and chambered shell, like a Nautilus uncoiled and straightened- Some species of this genus are several feet long (Figs. 266, Fig. 266. Fig. Portion of Orthoceras lalerale, Phillips. O. giganteum. Sow. Mountain Limestone. Section showing the siphuncle reduced two-thirds. 267.). The Goniatite is another
. Elements of geology. Geology. 254 LYELL'S ELEMENTS OF GEOLOGY. Corals and Shells of the Mountain Limestone. general, more widely from living forms, some being generically distinct from all those found in strata newer than the Coal. In this number may be mentioned Orthoceras, a siphuncled and chambered shell, like a Nautilus uncoiled and straightened- Some species of this genus are several feet long (Figs. 266, Fig. 266. Fig. Portion of Orthoceras lalerale, Phillips. O. giganteum. Sow. Mountain Limestone. Section showing the siphuncle reduced two-thirds. 267.). The Goniatite is another genus nearly alh'ed to the Am- monite, from which it differs in having the lobes of the septa free from lateral denticulations, or crenatures; so that the outHne of these is continuous and uninterrupted (see ct, Fig. 268.). Their Fig. 268. ^ Fig. 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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Keywords: ., bookauthorlyellcharlessir17, bookcentury1800, booksubjectgeology
