The main paleotectonic belts in Nevada consist of an eastern nonvolcanic (miogeosynclinal) dominantly carbonate area and a western belt of thrust sheets of argillites, quartzites, cherts, lavas, and fragmental volcanic rocks. Deposition was first strongly affected by thrusting in the Late Devonian. In Newfoundland thrust sheets of Cambrian and Ordovician quartzites and carbonates as well as volcanic rocks and ultrabasic intrusions are overlain unconformably by later Ordovician and younger strata. The history of the miogeosynclinal belt and its relation to the eugeosynclinal belt are shown best in Nevada, whereas the history of the volcanic belt is shown better in Newfoundland.

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