semi-bolson


semi-bolson
   (colloquial: western USA)
   A wide desert basin or valley that is drained by an intermittent stream, an externally drained (open) intermontane basin.
   Compare: bolson.
   GG

Glossary of landform and geologic terms. 2013.

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  • bolson —    (colloquial: western USA) A term applied to an internally drained (closed) intermontane basin in arid regions where drainages from adjacent mountains converge toward a central depression. Bolsons are often tectonically formed depressions.… …   Glossary of landform and geologic terms

  • mountain valley —     a) Any small, externally drained V shaped depression (in cross section) cut or deepened by a stream and floored with alluvium, or a broader, U shaped depression modified by an alpine glacier and floored with either till or alluvium, that… …   Glossary of landform and geologic terms

  • intermontane basin —    A generic term for wide structural depressions between mountain ranges that are partly filled with alluvium and called valleys in the vernacular. Intermontane basins may be drained internally (bolsons) or externally (semi bolson).    FFP …   Glossary of landform and geologic terms

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