. Elements of geology. Geology. 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. Goniatites evolutus, Phillips.* Bellerophon costatus, Mountain limestone. Mountain limestone. siphon is small, and in the form of the strise of gr
. Elements of geology. Geology. 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. Goniatites evolutus, Phillips.* Bellerophon costatus, Mountain limestone. Mountain limestone. siphon is small, and in the form of the strise of growth they resemble Nautili. Another extinct generic form of Cephalopod, abounding in the Mountain limestone, and not found in strata of later date, is the Bellerophon (Fig. 269.), of which the shell, like the living Argonaut, was without chambers. Climate of the Carboniferous period.—The abundance of lamelliferous and other corals, of large chambered Cephalopods and Crinoidea, naturally leads us to infer that the waters of the sea, at this period, were of a far warmer and more equable tem- perature than is now experienced in those latitudes where the Coal" strata abound, in Europe. M. Adolphe Brongniart has been led to a similar conclusion in regard to the temperature of the * Phillips, Geoi. of Yorksh., pi. 20. fig. 65. 17. 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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