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单词 crag and tail
释义
crag and tail

Geology and Earth Sciences
  • Land-form consisting of a small rocky hill (crag) from which extends a tapering ridge of unconsolidated debris (tail). The crag is a residual feature left by selective glacial erosion, while the tail is drift-deposited by ice on the lee side of the obstacle.


Geography
  • A large rock outcrop, with a rampart of till on its lee side, formed by erosion on the up-glacier side of the outcrop and deposition of debris in the low-pressure lee area. Glasser and Bennett (2004) Prog. Phys. Geog. 28, 1 define micro crag and tails as small tails of rock that are preferentially protected from glacial abrasion in the lee of resistant grains or mineral crystals on the surface of a rock.


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