Metamorphic rock rich in quartz created by the recrystallization of sandstone.
Quaternary ...
metamorphic rock -- Any rock derived from other rocks by chemical, mineralogical and structural changes resulting from pressure, temperature or shearing stress.
Metamorphic Rock:
Rock that has been physically altered by heat and/or pressure.
metamorphic rock A rock changed from its original form and/or composition by heat, pressure, or chemically active fluids, or some combination of them.
The igneous and metamorphic rocks that exist below the oldest sedimentary cover. In some areas such as shields the basement rocks may be exposed at the surface.
Basic Rock:
An igneous rock that has a relatively low silica content.
 See also: Surface, Sediment, Image, Plate, Area
  
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