stream terrace


stream terrace
   One, or a series of flat-topped landforms in a stream valley that flank and are parallel to the stream channel, originally formed by a previous stream level, and representing remnants of an abandoned flood plain, stream bed, or valley floor produced during a past state of fluvial erosion or deposition (i.e., currently very rarely or never flooded; inactive cut and fill and/or scour and fill processes). Erosional surfaces cut into bedrock and thinly mantled with stream deposits (alluvium) are called "strath terraces." Remnants of constructional valley floors thickly mantled with alluvium are called alluvial terraces.
   HP & SW

Glossary of landform and geologic terms. 2013.

Look at other dictionaries:

  • Stream terrace — Stream terraces are relict features, such as floodplains, from periods when a stream was flowing at a higher elevation and has downcut to a lower elevation. Stream terraces often appear as plateaus on existing valley walls and indicate earlier… …   Wikipedia

  • stream terrace — noun : one of a series of terraces cut usually out of solid rock by successive changes in the regimen of a stream from alluviation to downcutting called also river terrace; compare alluvial terrace …   Useful english dictionary

  • Terrace — A terrace may refer to:*Terrace (agriculture), a leveled surface *Terrace (building), a raised flat platform *Terrace deposit, geological term for a flat platform of land *Terrace (gardening), an element where a raised flat paved or gravelled… …   Wikipedia

  • terrace remnant —    A stream terrace eroded and dissected to such an extent that it occurs as a scattered and isolated geomorphic surface generally on interfluve noses above a younger, more continuous stream terrace. A continuous tread surface no longer exists,… …   Glossary of landform and geologic terms

  • terrace —    [ geomorphology ]    A step like surface, bordering a valley floor or shoreline, that represents the former position of a flood plain, or lake or sea shore. The term is usually applied to both the relatively flat summit surface (tread), cut or …   Glossary of landform and geologic terms

  • Terrace deposit — A terrace deposit is geological term for a flat platform of land created alongside of a river or sea, where, at some time in the past, the river has cut itself a deeper channel. The former floodplain of the river is therefore at a higher point… …   Wikipedia

  • strath terrace —    A type of stream terrace, formed as an erosional surface cut on bedrock and thinly mantled (e.g., < 3 m) with stream deposits (alluvium), commonly with a gravel lag deposit immediately above the bedrock.    SW & GG …   Glossary of landform and geologic terms

  • fluviomarine terrace —    A constructional coastal strip, sloping gently seaward and/or down valley, veneered or completely composed of fluviomarine deposits (typically silt, sand, fine gravel).    Compare: terrace, stream terrace, marine terrace.    SW …   Glossary of landform and geologic terms

  • alluvial terrace —    (not preferred)    refer to stream terrace …   Glossary of landform and geologic terms

  • river terrace — noun : stream terrace …   Useful english dictionary