collapsed outwash plain

   An outwash plain which forms on glacial ice (inside the glacial margin), and is subsequently let down or collapsed when the underlying ice melts, resulting in contortion or folding of the sediments and sedimentary structures to the extent that little of the original plain or its gradient remain. Outwash sediments commonly cap present-day topography.
   SW & CF

Glossary of landform and geologic terms. 2013.

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  • outwash plain —    An extensive lowland area of coarse textured, glaciofluvial material. An outwash plain is commonly smooth; where pitted, due to melt out of incorporated ice masses (pitted outwash plain), it is generally low in relief and largely retains its… …   Glossary of landform and geologic terms

  • pitted outwash plain —    An outwash plain marked by many irregular depressions such as kettles, shallow pits, and potholes which formed by melting of incorporated ice masses; much of the gradient and internal structures of the original plain remain intact; many are… …   Glossary of landform and geologic terms

  • pitted outwash terrace —    A relict glaciofluvial terrace that retains its original attitude, composed of undistorted outwash sediments and depositional structures and whose surface is pock marked with numerous potholes or kettle depressions.    Compare: collapsed… …   Glossary of landform and geologic terms

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