dc.contributor.author	Field, J.J.
dc.contributor.author	Pearthree, P.A.
dc.date.accessioned	2018-11-10T02:52:53Z
dc.date.available	2018-11-10T02:52:53Z
dc.date.issued	1993-09-01
dc.identifier.citation	Field, J.J. and Pearthree, P.A., 1993, Surficial geologic maps of the northern Avra Valley-Desert Peak Area, Pinal and Pima Counties, southern Arizona. Arizona Geological Survey Open File Report, OFR-93-13, 9 map sheets, map scale 1:24,000, 11 p.
dc.identifier.uri	http://hdl.handle.net/10150/630799
dc.description	These nine maps depict the general ages and distribution of Quaternary geomorphic surfaces and associated alluvium of the northern Avra Valley-Desert Peak (AVDP) area, Pinal and Pima counties, southern Arizona. The area mapped includes portions of the piedmonts surrounding the Silver Bell, Picacho, and Tortolita mountains, and the basin flats between them. The southern margin of the study area is approximately 40 km northwest of downtown Tucson. The AVDP area is one of many broad valleys in the Basin and Range physiographic province of southern Arizona. The Basin and Range province in the vicinity of the study area is characterized by relatively small mountain ranges with fairly low relief separated by wide, gently sloping piedmonts and basin bottom river drainages. The major drainages flowing through study area are the Santa Cruz River, Brawley Wash, and McClellan Wash. By indicating the age and physical characteristics of surficial alluvial deposits, these maps provide a basis for evaluating the Quaternary geologic history of the area and assessing potential geologic hazards. Alluvial deposits differentiated for these maps are assigned to Quaternary and Upper Tertiary age categories primarily on the basis of the estimated age of cessation of major deposition on geomorphic surfaces associated with the deposits. Relative topographic positions of each surface, drainage patterns, surface characteristics, and degree of soil development associated with the surface are the principal criteria used to assess surface age. Six ages of surfaces are differentiated in these maps. Map units are further subdivided into piedmont and basin axis units. The characteristics of each map unit are described below. The estimated ages of the units are inferred by correlation with similar surfaces and soils dated elsewhere in the southwestern United States (Gile and others, 1981; Bull, 1991; Menges and McFadden, 1981). Generalized lithologies of exposed bedrock are also depicted on the maps. (11 pages)
dc.language.iso	en
dc.publisher	Arizona Geological Survey (Tucson, AZ)
dc.relation.ispartofseries	OFR-93-13
dc.relation.url	https://library.azgs.arizona.edu/
dc.rights	Arizona Geological Survey. All rights reserved.
dc.subject	Arizona Geological Survey Open File Reports
dc.subject	Avra Valley-Desert Peak Area
dc.subject	Pinal County
dc.subject	Pima County
dc.subject	Arizona
dc.subject	geologic hazards
dc.subject	topography
dc.subject	geomorphology
dc.subject	quaternary alluvial deposits
dc.subject	maps
dc.subject	surficial geology
dc.subject	Geology
dc.subject	Proterozoic
dc.subject	cretaceous
dc.subject	Late Tertiary
dc.subject	Pleistocene
dc.subject	Holocene
dc.subject	Quaternary
dc.subject	Basin and Range Province
dc.subject	McClellan Wash
dc.subject	Brawley Wash
dc.subject	Santa Cruz River
dc.subject	Tortolita Mountains
dc.subject	Picacho Mountains
dc.subject	Silver Bell Mountains
dc.subject	metasedimentary rocks
dc.subject	sedimentary rocks

Surficial geologic maps of the northern Avra Valley-Desert Peak Area, Pinal and Pima Counties, southern Arizona

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