Sentence Examples


  • - The system is composed chiefly of clastic rocks, and their composition and structure show that the water in which they were deposited was shallow.
  • Here clastic rocks predominate, while limestone is more abundant in the interior, If the maximum thicknesses of all Devonian formations be added together, the total for the system is as much as 15,000 ft.; but such a thickness is not found in any one pluce.
  • In the Mississippi Basin the larger part of the system is of limestone, though there is some clastic mateiial in both its basal and its upper parts.
  • In Ohio the system contains much clastic rock, and in Pennsylvania little else.
  • The Pottsville formation is chiefly clastic, and corresponds roughly to the Millstone Grit of England.

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