. Elements of geology, or, The ancient changes of the earth and its inhabitants as illustrated by geological monuments. Geology. Cyprist inflata (or Cy- there t). Nat. size, and magnified. Murchison* In the lower coal-measures of Coalbrook Dale, the strata, accord- ing to Mr. Prestwich, often change completely within very short dis- tances, beds of sandstone passing horizontally into clay, and clay into sandstone. The coal-seams often wedge out or disappear; and sec- tions, at places nearly contiguous, present marked lithological dis- tinctions. In this single field, in which the strata are fr
. Elements of geology, or, The ancient changes of the earth and its inhabitants as illustrated by geological monuments. Geology. Cyprist inflata (or Cy- there t). Nat. size, and magnified. Murchison* In the lower coal-measures of Coalbrook Dale, the strata, accord- ing to Mr. Prestwich, often change completely within very short dis- tances, beds of sandstone passing horizontally into clay, and clay into sandstone. The coal-seams often wedge out or disappear; and sec- tions, at places nearly contiguous, present marked lithological dis- tinctions. In this single field, in which the strata are from 700 to 800 feet thick, between forty and fifty species of terrestrial plants have been discovered, besides several fishes of the genera Megalich- tkys, Holoptychius, and others. Crustacea are also met with, of the genus Limulus (see fig. 547), resembling in all essential characters Fig. 547. 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. New York, D. Appleton and co.
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Keywords: ., bookcentury1800, bookdecade1860, booksubjectgeology, bookyear1868
