| Abstract: | The Needles 7.5‘ quadrangle straddles the Colorado River in the southern part of the Mohave Valley, in Mohave County, Arizona, and San Bernardino County, California. The quadrangle contains part of the Havasu National Wildlife Refuge, sections of the Fort Mojave Indian Reservation, most of the city of Needles, and several major interstate highways and railroads. The quadrangle is underlain by structurally undeformed sediments of Pliocene and younger age that were deposited by the Colorado River, as well as alluvial fan deposits on the piedmonts that flank the Black Mountains (in Arizona) and the Sacramento Mountains (in California).
Multiple cycles of aggradation of the Colorado River, each followed by episodes of downcutting, are recorded by Pliocene through historic deposits on the piedmonts that border the floodplain. Regionally, the complex stratigraphy related to the Colorado River has been the subject of geologic interest for over 150 years. The California and Arizona piedmont portions of the Needles quadrangle expose a subset of this incompletely understood stratigraphic record. Thus, the stratigraphic sequence presented on this map is a version of the stratigraphy of the Colorado River as interpreted locally.
The deposits in the recently active Colorado River valley floor support riparian habitat and irrigated agriculture. The distributions of sand-rich channel deposits and mud-rich floodplain deposits in the valley are mapped on the basis of the history of the movement of the Colorado River in the quadrangle, which has been documented in sequential aerial photographs since 1937 and maps dating to 1857. |
| Genre: | USGS Numbered Series |
| ProdID: | 97345 |
| Citation Author: | Malmon, Daniel V.; Howard, Keith A.; Priest, Susan S. |
| Citation Contributing Office: | Western Earth Surface Processes |
| Citation Datum: | |
| Citation Day: | |
| Citation Edition: | Version 1.0 |
| Citation Editor: | |
| Citation End Page: | |
| Citation Issue: | |
| Citation Keywords: | |
| Citation Language: | ENGLISH |
| Citation Larger Work Title: | |
| Citation LatN: | 0345230 |
| Citation LatS: | 0344500 |
| Citation LonE: | -1143000 |
| Citation LonW: | -1143730 |
| Citation Month: | |
| Citation No Pagination: | N |
| Citation Number Of Pages: | |
| Citation Online Only Flag: | N |
| Citation Phsyical Description: | Report: ii, 31 p.; Map: 37 x 29.5 inches; Image; ReadMe; Metadata; Geodatabase; Shapefiles |
| Citation Projection: | Polyconic |
| Citation Public Comments: | |
| Citation Publisher: | U.S. Geological Survey |
| Citation Series: | Scientific Investigations Map |
| Citation Series Code: | SIM |
| Citation Series Number: | 3062 |
| Citation Search Results Text: | Geologic Map of the Needles 7.5‘ Quadrangle, California and Arizona; 2009; SIM; 3062; Malmon, Daniel V.; Howard, Keith A.; Priest, Susan S. |
| Citation Start Page: | |
| Citation Volume: | |
| Citation Year: | 2009 |
| Type: | citation/reference |
| Text: | Geologic Map of the Needles 7.5‘ Quadrangle, California and Arizona; 2009; SIM; 3062; Malmon, Daniel V.; Howard, Keith A.; Priest, Susan S. |
| URL (THUMBNAIL): | http://pubs.er.usgs.gov/thumbnails/usgs_thumb.jpg |
| URL (INDEX PAGE): | http://pubs.usgs.gov/sim/3062/ |
| URL (INDEX PAGE): | http://ngmdb.usgs.gov/Prodesc/proddesc_86429.htm |
| Date Other: | Wed, 11 Mar 2009 00:00 -0500 |
| Publisher: | U.S. Geological Survey |
