Surficial geologic maps of the Tucson Metropolitan Area
Dataset Identification:
Resource Abstract:
Four geomorphically distinct ages of alluvial fan surfaces can be recognized on the piedmonts flanking the Catalina, Tortolita,
and Tucson Mountains. Channel entrenchment of the upper piedmonts during the Quaternary has lead to the preservation of individual
fan surfaces that become progressively younger and lower in relief toward the valley axes. Ongoing downcutting of Rillito
Creek and Santa Cruz River as well as the Canada del Oro Wash has enhanced the incision of mountain-sourced drainages and
further increased the relief separating alluvial surfaces of different ages. Thus, periods of climatically induced downcutting
separated times of aggradation or equilibrium produce a sequence of discrete alluvial surfaces of different ages. Episodes
of downcutting along the Santa Cruz and Rillito Rivers has further resulted in a series of fluvial terraces within the central
Tucson Basin Area. Wide pediments flanking each of the mountain fronts in the map area indicate general tectonic quiescence
during the Quaternary.( 7 pages & 12 map sheets, 1:24,000 scale)
Citation
Title Surficial geologic maps of the Tucson Metropolitan Area
notes: This metadata record has been processed by the iso-19115-to-usgin-19115-data XSLT to ensure that all mandatory content for
USGIN profile has been added.2013-11-04T12:00:00
Metadata contact
-
pointOfContact
individual Name Missing
organisation Name
Arizona Geological Survey
position Name missing
Contact information
Telephone
Voice 520.770.3500
Fax 520.770.3505
Address
416 W. Congress, Ste # 100, Tucson, AZ, 85701-1381
Country USA