Conglomerate Clast Counts in Oligocene-Miocene Strata North from the Catalina Core Complex to the Gila River Valley, Southeastern Arizona

Dickinson, W.R.

Name:

CR-O8-C_webfile.pdf

Size:

2.242Mb

Format:

PDF

Download

Citation

Dickinson, W.R., 2008, Conglomerate Clast Counts in Oligocene-Miocene Strata North from the Catalina Core Complex to the Gila River Valley, Southeastern Arizona: Arizona Geological Survey Contributed Report CR-08-C, 34 p.

Description

To provide insight into provenance relations for multiple mid-Oligocene to mid-Miocene subbasins (typically half-grabens) dissected by erosion in uplands lying north of the Catalina core complex and west of the San Pedro trough, 136 outcrop counts were made of clast types in tilted conglomerates of the Cloudburst and San Manuel Formations and their lateral equivalents in exposures as far north as the Gila River near Kearny. Clast counts were not made for younger conglomerates of the post-mid-Miocene Quiburis Formation, which fills the San Pedro trough and onlaps flanking uplands (Dickinson, 1998), because Quiburis clast assemblages in all cases match bedrock sources exposed uphill on the modern landscape. By contrast, paleotopography during Cloudburst and San Manuel deposition can only be inferred from local paleocurrent indicators (clast imbrications; figure 39 of Dickinson, 1991, p. 70-71) and clast assemblages in tilted strata. Areas included in this study were the Guild Wash allochthon between the Tortolita and Suizo Mountains, the Star Flat allochthon on the east flank of the Black Mountains, the Black Hills (west of Mammoth), Camp Grant Wash (and Putnam Wash) between the Black Mountains and the Black Hills, multiple drainages of the Tortilla Mountains (Eagle Wash, Jim Thomas Wash, Hackberry Wash, Indian Camp Wash), and Ripsey Wash on the west flank of the Tortilla Mountains.

URI

http://hdl.handle.net/10150/629279

Additional Links

https://library.azgs.arizona.edu/item/AGCR-1552429818257-27

Language

Series/Report no.

CR-08-C

Rights

Collection Information

Documents in the AZGS Document Repository collection are made available by the Arizona Geological Survey (AZGS) and the University Libraries at the University of Arizona. For more information about items in this collection, please contact azgs-info@email.arizona.edu.

North Bounding Coordinate

33.2754

South Bounding Coordinate

32.4356

West Bounding Coordinate

-111.533

East Bounding Coordinate

-110.468

Collections

AZGS Document Repository