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Note: Do not rely on this information. It is very old.
Outcrop
Outcrop, or Basset Edge, the exposure of a rock at the surface. The width of the outcrop depends both on the dip or variation from horizontality and on the thickness of a stratum. Its general direction on the map is termed the strike (q.v.). The outcrop of soft rocks will often be flat, whilst that of relatively harder ones may stand up as an escarpment.