Surficial Geologic Map and Flood Hazard Assessment, Rainbow Valley, Maricopa County, Arizona, v 2.0
KeywordsArizona Geological Survey Digital Geologic Maps
flood hazard level
Sonoran Desert National Monument
Palo Verde Mountains
MetadataShow full item record
CitationPearthree, P.A., Youberg, A., and Shipman, T.C., 2020, Surficial Geologic Map and Flood Hazard Assessment, Rainbow Valley, Maricopa County, Arizona: Arizona Geological Survey Digital Geologic Map DGM-71, version 3.0, map scale 1:24,000, 13 p. and 3 map sheets.
PublisherArizona Geological Survey (Tucson, AZ)
DescriptionGeomorphologic analyses and surficial geologic mapping provide information about the age and type of alluvial deposits on piedmonts that is critical in assessing the character of piedmont landforms and the nature and extent of piedmont flood hazards. Piedmonts in Maricopa County are covered by complex mosaics of surficial deposits with different physical characteristics related to the ages of the deposits. Surficial geologic maps differentiate alluvial deposits based on physical characteristics of the deposits (sediment size and character) and geomorphic characteristics of the upper surfaces of the deposits. Differences in the primary physical characteristics of surficial deposits result from differences in rock types in drainage basins and differences in the size and character of the stream system that transported the sediment. Surficial deposits are subsequently altered by processes including weathering, soil development, and local erosion, so the character of the surface and near-surface portion of the deposits is related to the length of time that the deposits have been exposed at the surface. Simply stated, active fluvial systems leave behind evidence of their activity in the form of young deposits. Thus, surficial geologic maps are very useful in defining the physical framework of active fluvial systems on piedmonts.
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North Bounding Coordinate33.386
South Bounding Coordinate32.896
West Bounding Coordinate-112.554
East Bounding Coordinate-112.178
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