. Elements of geology, or, The ancient changes of the earth and its inhabitants as illustrated by geological monuments. Geology. Ch. XXVI.] LOWER DEVONIAN. 541 fer," because they contain in abundance a fossil body of very curious structure, Calceola sandalina (fig. 614), which has been usually con- sidered a brachiopod, but which some naturalists have lately referred to a coral. They suppose it to be an abnormal form of the order Zoantharia rugosa (see fig. 563, p. 515), differing from all other corals in being furnished with a strong operculum. Lower Devonian. Beneath the Middle Devonian
. Elements of geology, or, The ancient changes of the earth and its inhabitants as illustrated by geological monuments. Geology. Ch. XXVI.] LOWER DEVONIAN. 541 fer," because they contain in abundance a fossil body of very curious structure, Calceola sandalina (fig. 614), which has been usually con- sidered a brachiopod, but which some naturalists have lately referred to a coral. They suppose it to be an abnormal form of the order Zoantharia rugosa (see fig. 563, p. 515), differing from all other corals in being furnished with a strong operculum. Lower Devonian. Beneath the Middle Devonian limestones and schists already enu- merated, a series of slaty beds and quartzose sandstones, the latter constituting the "Older Rhenish Greywacke" of Rorner, and the " Spirifer sandstone " of Sandberger, are exhibited between Coblentz and Caub.* A portion of these rocks on the Rhine and in some of the adjacent countries was regarded as " Upper Silurian" by Prof. Sedgwick and Sir R. Murchison in 1839, but their true age has since been determined. Their equivalents are found in England in the sandstones and slates of the Foreland and Linton *%• 615- in Devon (Nos. 4 and 5 of the table, p. 536), and, according to Mr. Sal- ter, in the sandstone of Torquay in South Devon, where many of the char- Spirife?'mucronatus,;ll. Devonian of Pennsylvania,. Fiff. 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. New York, D. Appleton and co.
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Keywords: ., bookcentury1800, bookdecade1860, booksubjectgeology, bookyear1868
