glacial-valley floor


glacial-valley floor
   The comparatively flat bottom of a mountain valley predominantly mantled by till but which can grade from glacial scour (scoured rock outcrop) near its head to a thick mantle of till, and ultimately merging with alluvium or colluvium further down valley. Some glacial-valley floors descend downstream in a series of scour-derived steps which may contain sequential tarn lakes (pater noster lakes); (not preferred: colloquial: western USA) sometimes called a trough bottom.
   SW

Glossary of landform and geologic terms. 2013.

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