beveled base
   The lower portion of a canyon wall or escarpment marked by a sharp reduction in slope gradient from the precipitous cliff above, and characteristically composed of thinly mantled colluvium (i.e., < 1 m) and / or carapaced with a thin surficial mantle of large rock fragments from above, which overly residuum of less resistant rock (e.g., shale) whose thin strata intermittently outcrop at the surface; a zone of erosion and transport common in the canyonlands of the semiarid, southwestern USA.
   Compare: talus slope.
   SW

Glossary of landform and geologic terms. 2013.

Look at other dictionaries:

  • colluvial apron —    A landform with a concave to planar surface composed of a thick wedge shaped deposit of colluvium and/or slope alluvium that forms the base (footslope) of a bluff, escarpment or steep slope .    Compare: beveled base.    SW …   Glossary of landform and geologic terms

  • talus cone —    A steep (e.g., 30 40.), cone shaped landform at the base of a cliff or escarpment that heads in a relatively small declivity or ravine, and composed of poorly sorted rock and soil debris that has accumulated primarily by episodic rockfall or,… …   Glossary of landform and geologic terms

  • canyon wall —    The steep to near vertical slope between a canyon bottom and higher, adjacent hillslopes, mountain slopes, or summits. Canyon walls are generally dominated by rock outcrop and/or bedrock within the soil profile. Canyon walls commonly include… …   Glossary of landform and geologic terms

  • cliff —    Any high, very steep to perpendicular or overhanging face of rock or earth; a precipice.    Compare: bluff, beveled base.    GG …   Glossary of landform and geologic terms

  • talus slope —    a portion of a hillslope or mountainslope mantled by talus and lying below a rockfall source (e.g., cliff).    Compare: scree slope, scree, talus.    Compare: beveled base.    SW …   Glossary of landform and geologic terms

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