Sentence Examples


  • Cambrian, Ordovician and Silurian beds have been recognized, the Upper Cambrian consisting of a limestone which is very rich in metalliferous ores (especially galena and calamine).
  • Contemporaneous volcanic rocks are associated with the Ordovician beds and with the Rhaetic sandstones in several places.
  • The higher steppes, as far as they are known, consist of Ordovician and Cambrian rocks, with an average elevation of 1500 to 3000 ft.
  • The breaking up of the old Archean foundation block began in Cambrian and Ordovician times.
  • Marine Ordovician rocks were deposited along the same general course.

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