alluvial flat

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Noun1.alluvial flat - a flat resulting from repeated deposits of alluvial material by running water
flat - a level tract of land; "the salt flats of Utah"
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This indicates the interbedding of clays and coal from swamps (which are part of an alluvial flat), with sandy units that represent the fluvial meandering channels.
corner of Gyanima, lies across the alluvial flat, where it is only about 15,500 feet, or still 700 feet short of its extreme elevation; and the former river, instead of making its way out along with the latter by the open gorge of Upper Purang, breaks through the barrier of the Hangrang mountains by a narrow fissure between peaks of 20,000 and 22,500 feet.
Differences mainly occurred near streams where the landscape mapping showed larger areas of alluvial flat extending away from the creeks, whereas the UPNESS index was more confined to the streams in these locations.