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The deposition of till or the abrasion of the bedrock can result in depressions suitable for creating small lakes. Many times the lakes form as deposition of till from a glacier in the main valley blocks the stream from a tributary valley. In cirques, the lakes that form in the rock basins are called tarns or cirque lakes. Down the valley from a cirque, other lakes sometimes form in a sequences as the deposition and erosion create small catchments for the water (so called paternostal lakes if arranged in this stepwise manner).
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