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View article: Timing and geometry of the Chemehuevi Formation reveal a late Pleistocene sediment pulse into the Lower Colorado River
Timing and geometry of the Chemehuevi Formation reveal a late Pleistocene sediment pulse into the Lower Colorado River Open
The Chemehuevi Formation is a distinctive 50–150-m-thick wedge-shaped Pleistocene sedimentary unit deposited by the Colorado River. It lines the perimeters of the river’s floodplains and bedrock canyons for more than 600 km between the mou…
View article: New <sup>10</sup>Be-<sup>26</sup>Al isochron burial dating informs the Pliocene and Pleistocene evolution of the lower Colorado River, southwestern United States
New <sup>10</sup>Be-<sup>26</sup>Al isochron burial dating informs the Pliocene and Pleistocene evolution of the lower Colorado River, southwestern United States Open
Four new 10 Be-26 Al isochron burial ages ranging from 4.4 to 2 Ma on ancestral Colorado River deposits in the lower Colorado River corridor (LCRC) help constrain the river's evolution during the Pliocene and early Pleistocene.They help fi…
View article: Evolution of Miocene normal and dextral faulting in the lower Colorado River region near Blythe, California, USA
Evolution of Miocene normal and dextral faulting in the lower Colorado River region near Blythe, California, USA Open
The evolution of strain in nascent continental plate boundaries commonly involves distributed deformation and transitions between different styles of deformation as the plate boundary matures. Distributed NW-striking faults, many with km-s…
View article: Supplemental Material: Redefining the age of the lower Colorado River, southwestern United States
Supplemental Material: Redefining the age of the lower Colorado River, southwestern United States Open
Additional details on methods, summary of previous Ar/Ar dating relevant to the timing of Colorado River integration, sample locations, and full analytical results.
View article: Supplemental Material: Redefining the age of the lower Colorado River, southwestern United States
Supplemental Material: Redefining the age of the lower Colorado River, southwestern United States Open
Additional details on methods, summary of previous Ar/Ar dating relevant to the timing of Colorado River integration, sample locations, and full analytical results.
View article: Supplemental Material: Post–12 Ma deformation in the lower Colorado River corridor, southwestern USA: Implications for diffuse transtension and the Bouse Formation
Supplemental Material: Post–12 Ma deformation in the lower Colorado River corridor, southwestern USA: Implications for diffuse transtension and the Bouse Formation Open
Geosphere, February 2020, v. 16, no. 1, 111-135, doi:10.1130/GES02104.1, Supplemental Material. Data Item 1: fault compilation references, supplemental figures, decompaction parameters, and rose diagram output data. Data Item 2: Fault geom…
View article: Surficial geologic map of the Spirit Mountain SE and part of the Spirit Mountain NE 7.5' quadrangles, Nevada and Arizona
Surficial geologic map of the Spirit Mountain SE and part of the Spirit Mountain NE 7.5' quadrangles, Nevada and Arizona Open
First posted October 13, 2020 For additional information, contact: Contact Information, Geology, Minerals, Energy, & Geophysics Science CenterU.S. Geological Survey2255 N. Gemini DriveFlagstaff, AZ 86001-1600 This geologic map includes a t…
View article: Post–12 Ma deformation in the lower Colorado River corridor, southwestern USA: Implications for diffuse transtension and the Bouse Formation
Post–12 Ma deformation in the lower Colorado River corridor, southwestern USA: Implications for diffuse transtension and the Bouse Formation Open
Structural evidence presented here documents that deformation was ongoing within the lower Colorado River corridor (southwestern USA) during and after the latest Miocene Epoch, postdating large-magnitude extension and metamorphic core comp…
View article: The Bouse Formation, a controversial Neogene archive of the evolving Colorado River: a scientific drilling workshop report (28 February–3 March 2019 – BlueWater Resort & Casino, Parker, AZ, USA)
The Bouse Formation, a controversial Neogene archive of the evolving Colorado River: a scientific drilling workshop report (28 February–3 March 2019 – BlueWater Resort & Casino, Parker, AZ, USA) Open
Neogene deposits of the lower Colorado River valley, especially the Miocene(?) and early Pliocene Bouse Formation, have been the focus of intense debate regarding the early paleoenvironmental history of this important continental-scale riv…
View article: THOMPSON FIELD FORUM REPORT: Age and Carving of Grand Canyon: Toward a Resolution of 150 Years of Debate
THOMPSON FIELD FORUM REPORT: Age and Carving of Grand Canyon: Toward a Resolution of 150 Years of Debate Open
Grand Canyon, in the western USA, have been debated since J.
View article: Insights into post-Miocene uplift of the western margin of the Colorado Plateau from the stratigraphic record of the lower Colorado River
Insights into post-Miocene uplift of the western margin of the Colorado Plateau from the stratigraphic record of the lower Colorado River Open
The spatial and temporal distribution of Pliocene to Holocene Colorado River deposits (southwestern USA and northwestern Mexico) form a primary data set that records the evolution of a continental-scale river system and helps to delineate …
View article: Birth and evolution of the Virgin River fluvial system: ∼1 km of post–5 Ma uplift of the western Colorado Plateau
Birth and evolution of the Virgin River fluvial system: ∼1 km of post–5 Ma uplift of the western Colorado Plateau Open
The uplift history of the Colorado Plateau has been debated for over a century with still no unified hypotheses for the cause, timing, and rate of uplift. 40Ar/39Ar and K/Ar dating of recurrent basaltic volcanism over the past ∼6 Ma within…
View article: Timing of Laramide deformation onset in northern Arizona-New Mexico and its tectonic implications
Timing of Laramide deformation onset in northern Arizona-New Mexico and its tectonic implications Open
Observations from the southern Laramide region (Arizona-New Mexico) have figured prominently in deducing the tectonic processes that culminated in the formation of classic Colorado Plateau and Rocky Mountain basement-involved structures ~9…
View article: Carving Grand Canyon’s inner gorge: A test of steady incision versus rapid knickzone migration
Carving Grand Canyon’s inner gorge: A test of steady incision versus rapid knickzone migration Open
A recent study posits that much of the 240-m-deep inner gorge of Grand Canyon was carved between 500 and 400 ka via passage of a migrating knickzone with incision rates of ∼1600 m/Ma during that time period; this was based on dating of a c…
View article: Geologic map of the Castle Rock 7.5' quadrangle, Arizona and California
Geologic map of the Castle Rock 7.5' quadrangle, Arizona and California Open
First posted August 21, 2018 For additional information, contact: Director,Geology, Minerals, Energy, & Geophysics Science CenterFlagstaff, ArizonaU.S. Geological Survey2255 N. Gemini DriveFlagstaff, AZ 86001-1600 The Castle Rock quadrangl…
View article: The Colorado River and its deposits downstream from Grand Canyon in Arizona, California, and Nevada
The Colorado River and its deposits downstream from Grand Canyon in Arizona, California, and Nevada Open
First posted February 5, 2018 For additional information, contact: Director,Geology, Minerals, Energy, & Geophysics Science CenterMenlo Park, CaliforniaU.S. Geological Survey345 Middlefield RoadMenlo Park, CA 94025-3591 Understanding the e…
View article: Cenozoic incision history of the Little Colorado River: Its role in carving Grand Canyon and onset of rapid incision in the past ca. 2 Ma in the Colorado River System
Cenozoic incision history of the Little Colorado River: Its role in carving Grand Canyon and onset of rapid incision in the past ca. 2 Ma in the Colorado River System Open
This paper documents a multi-stage incision and denudation history for the Little Colorado River (LCR) region of the southwestern Colorado Plateau over the past 70 Ma. The first two pulses of denudation are documented by thermochronologic …