caprock

caprock
    a) A hard rock layer, usually sandstone, lava, or in arid environments, limestone, that lies above shale or other less resistant bedrock or sediments; specifically a rock layer that forms relatively level, resistant topmost strata that holds up hills, ridges, mesas, etc., and commonly forms cliffs or escarpments.
   Also spelled “cap rock”.
   SW & GG.
    b) A hard rock layer, usually sandstone, overlying the shale above a coal bed.
   Also spelled “cap rock”.
   GG

Glossary of landform and geologic terms. 2013.

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