What is a blind valley?
Answers
Explanation:
Blind valley is a deep, narrow, flat bottomed valley with an abrupt ending. Such closed valleys may arise in limestone or karst landscapes, where a layer of permeable rock lies above an impermeable substrate such as marl.
Answer:
A blind valley is a composite surface feature of the karst cycle consisting of a normal river valley in impermeable sediments and its continuation in permeable rocks where the stream (or river and likewise the valley) abruptly ends in a depression or sinkhole. The part of the valley which is on impermeable sediments (shales, sandstones, dolomites; in the Mediterranean karst—flysch, for example) is usually several times longer (up to 20 times or more) than the part on the permeable rocks (usually limestone). In the limestone sector, the bottom is wider and flatter, while the slopes are steeper and form the rim of the amphitheatre. For this reason, the whole valley is called a blind or closed valley.
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