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Quarternary geology of the central Truckee Meadows, Nevada
AuthorMizell, Nancy Brent Hunt
AdvisorFirby, James R.
Geological Sciences and Engineering
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On the basis of their physical and statistical characteristics four units of unconsolidated sediments have been established as Quaternary and Holocene deposits within the Central Truckee Meadows area. A zone of weathering and decomposing clasts is indicative of the outwash gravel, while the more clayey reworked gravel lacks these weathering features. The alluvium, poorly sorted deposit overlies the outwash gravel and laterally grades into the very fine silty sands of the lacustrine deposits. Two problems arose in mapping the Central Truckee Meadows urban area. These are: 1) the low relief of the basin which, allows movement of the unconsolidated sediments, and difficulty in differentiation of fill material and original deposits, and 2) the poor sampling localities which introduces errors in sampling. Inconsistent grain- size statistics and erroneous conclusions in sedimentary environments may result from these urban problems. Mean size, inclusive standard deviation, inclusive graphic skewness, kurtosis, and CM diagrams were used to determine depositional environments. The outwash gravel sediments were deposited within graded suspension and protected channel environments, while the alluvium is suggestive of a turbidity or mudflow environment. Lacustrine sediments were found to be deposited in quiet water environments such as valley- flats.
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