kimerajamm
Joined: 28 Nov 2010
Posts: 785
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 Posted: Sat May 07, 2011 4:15 pm Post subject: The park |
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The park has a diverse and complex geologic history. Since its formation, the area that comprises the park has experienced at least four major periods of extensive volcanism, three or four periods of major sedimentation, and several intervals of major tectonic deformation where the crust has been reshaped. Two periods of glaciation (a series of ice ages) have also had effects on the area, although no glaciers ever existed in the ranges now in the park.
[edit] Basement and Pahrump Group
Little is known about the history of the oldest exposed rocks in the area due to extensive metamorphism (alteration of rock by heat and pressure). Radiometric dating gives an age of 1,700 million years for the metamorphism (during the Proterozoic: See bottom of the geologic timeline).[6] About 1,400 million years ago a mass of granite now in the Panamint Range intruded this complex.[26] Uplift later exposed these rocks to nearly 500 million years of erosion.[
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