. Elements of geology. Geology. PART 11. CHAPTER XIX. 235 New Red Sandstone. land, until we reach the great plain of Lias at the base of the Inferior Oohte at Metz. It is evident, therefore, that the denuding causes have acted similarly over an area several hundred miles in diameter, sweep- ing away the softer clays more extensively than the limestones, and undermining these last so as to cause them to form steep cliffs wherever the harder calcareous rock was based upon a more yielding and destructible clay. This denudation probably occurred while the land was slowly rising out of the sea.* CH
. Elements of geology. Geology. PART 11. CHAPTER XIX. 235 New Red Sandstone. land, until we reach the great plain of Lias at the base of the Inferior Oohte at Metz. It is evident, therefore, that the denuding causes have acted similarly over an area several hundred miles in diameter, sweep- ing away the softer clays more extensively than the limestones, and undermining these last so as to cause them to form steep cliffs wherever the harder calcareous rock was based upon a more yielding and destructible clay. This denudation probably occurred while the land was slowly rising out of the sea.* CHAPTER XIX. NEW RED SANDSTONE GROUP. Distinction between New and Old Red sandstone—Between Upper and Lower New Red—Muschelkalk in Germany—Fossil plants and shells of New Red Group, entirely different from Lias and Magnesian limestone—Lower New Red and Magnesian limestone—Zechstein in Germany of the same age—General resemblance between the organic remains of the Magnesian limestone and Car- boniferous strata—Origin of red sandstone and red marl. Between the Lias and the Coal, or Carboniferous group, there is interposed in the midland and western counties of Eng- land a great series of red marls and sandstones, to which the name of the New Red Sandstone formation was given, to dis- tinguish it from the other marls and sandstones called the " Old Red," (c. Fig. 232.) often identical in mineral character, which lie immediately beneath the coal, h. Fig. 232. Old Red. Coal. New Red In some parts of the south-west of England, the entire " New Red" group consists exclusively of red loam, clay, and sand- stone, devoid of fossils, strongly contrasted in colour, and the general absence of calcareous matter, with the Oolitic rocks and * See Principles of Geology, Index, Wealden Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of the
Size: 3859px × 648px
Photo credit: © Paul Fearn / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookauthorlyellcharlessir17, bookcentury1800, booksubjectgeology
