Publications
Publications related to National Cooperative Geologic Mapping Program and its Components.
Filter Total Items: 167
Middle Pleistocene formation of the Rio Grande Gorge, San Luis Valley, south-central Colorado and north-central New Mexico, USA: Process, timing, and downstream implications
The Rio Grande is the fourth longest river in North America extending over 3,000 km from the Rocky Mountains to the Gulf of Mexico. The Pleistocene evolution of this river from individual subbasins into a coalesced fluvial system has been long debated. Herein, we constrain the middle Pleistocene evolution of the northernmost and largest Rio Grande basin, the San Luis basin, and the timing of incis
Authors
Chester A. Ruleman, Adam M. Hudson, Ren A. Thompson, Daniel P. Miggins, James B. Paces, Brent M. Goehring
A river is born: Highlights of the geologic evolution of the Colorado River extensional corridor and its river: A field guide honoring the life and legacy of Warren Hamilton
The Colorado River extensional corridor, which stretched by a factor of 2 in the Miocene, left a series of lowland basins and intervening bedrock ranges that, at the dawn of the Pliocene, were flooded by Colorado River water newly diverted from the Colorado Plateau through Grand Canyon. This water and subsequent sediment gave birth, through a series of overflowing lakes, to an integrated Colorado
Authors
Keith A. Howard, Kyle House, Barbara E John, Ryan S. Crow, Philip A Pearthree
Mesozoic to Cenozoic sedimentation, tectonics, and metallogeny of Sonora, Mexico
We will embark on a five-day journey through northern, western, and central
Sonora, in which we will see excellent examples of mostly Mesozoic to Cenozoic tectonics,
sedimentation, and metallogeny. On Day 1, we will visit the porphyry copper
deposit at Ajo, Arizona, and several Pleistocene cinder cones and maar craters in
the Pinacate Biosphere Reserve. On Day 2, we will see L- and L-S tectonites
Authors
Jason Price, Thierry Calmus, S. Bennett, Lucas Ochoa-Landín
One hundred and sixty years of Grand Canyon geological mapping
No abstract available.
Authors
Karl Karlstrom, Laura Crossey, Peter W. Huntoon, George Billingsley, Michael Timmons, Ryan S. Crow
Geochronologic, isotopic, and geochemical data from igneous rocks in the Lane Mountain area, San Bernardino County, California
We present new geochronologic, isotopic, and geochemical data for selected igneous rocks in the Lane Mountain area, California. We determined SHRIMP-RG U-Pb zircon ages for the following units: (1) Larrea complex (~253 Ma and ~149–146 Ma); (2) Daisy granodiorite (~151 Ma); (3) Jack Spring quartz monzonite (~85–82 Ma); (4) unnamed porphyritic dikes and stocks (~80–73 Ma); and (5) Lane Mountain volc
Authors
Paul Stone, Howard J. Brown, M. Robinson Cecil, Robert J. Fleck, Jorge A. Vazquez, John A. Fitzpatrick, Jose J. Rosario
Effects of infiltration characteristics on the spatial-temporal evolution of stability of an interstate highway embankment
Infiltration-induced landslides are among the most common natural disasters threatening modern civilization, but conventional methods for studying the triggering mechanisms and predicting the occurrence of these slides are limited by incomplete consideration of underlying physical processes and the lack of precision inherent in limit-equilibrium analyses. To address this problem the spatial-tempor
Authors
Eric Hinds, Ning Lu, Benjamin B. Mirus, Alexandra Wayllace
The Appalachian Geo-STEM Camp: Learning about geology through experiential adventure recreation
The inaugural Appalachian Geo-STEM Camp (AGC) was a partnership between West Virginia University (WVU), the U.S. Geological Survey (USGS) and the West Virginia Geological and Economic Survey (WVGES). Designed to engage high school students in geoscience-oriented Science, Technology, Engineering and Mathematics (STEM) activities through adventure-based outdoor recreation, the inaugural AGC took pl
Authors
Robert Burns, Mark W. Carter, John Brock, Jonas Leveque, Emily Bunse, Monica Palaseanu-Lovejoy, Gerald F. Guala, Nathan Harlan, Mitchel Blake, Jasmine Moreira, Jim Britton, Kenny Ashton, Barnes Nugent, Michael Marketti
Birth and evolution of the Virgin River fluvial system: ∼1 km of post–5 Ma uplift of the western Colorado Plateau
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 the Virgin River drainage system, southwest Utah, northwest Arizona, and southern Nevada, provides a way to reconstruct paleoprofiles and quantify differential
Authors
Cory Walk, Karl Karlstrom, Ryan S. Crow, Matt Heizler
A stratigraphic approach to inferring depositional ages from detrital geochronology data
With the increasing use of detrital geochronology data for provenance analyses, we have also developed new constraints on the age of otherwise undateable sedimentary deposits. Because a deposit can be no older than its youngest mineral constituent, the youngest defensible detrital mineral age defines the maximum depositional age of the sampled bed. Defining the youngest `defensible' age in the fac
Authors
Samuel Johnstone, Theresa M. Schwartz, Christopher S. Holm-Denoma
North-south dipole in winter hydroclimate in the western United States during the last deglaciation
During the termination of the last glacial period the western U.S. experienced exceptionally wet conditions, driven by changes in location and strength of the mid-latitude winter storm track. The distribution of modern winter precipitation is frequently characterized by a north-south wet/dry dipole pattern, controlled by interaction of the storm track with ocean-atmosphere conditions over the Paci
Authors
Adam M. Hudson, Benjamin J. Hatchett, Jay Quade, Douglas P. Boyle, Scott D. Bassett, Guleed Ali, Marie G. De los Santos
A supervolcano and its sidekicks: A 100 ka eruptive chronology of the Fish Canyon Tuff and associated units of the La Garita magmatic system
Establishing temporal constrains on major volcanic eruptions is limited by the precision of existing geochronometers. Prior work on the La Garita caldera, created by the eruption of the Fish Canyon Tuff, failed to resolve temporal differences between pre-, syn-, and post-collapse eruptive units. Here, we report 40Ar/39Ar geochronologic data supporting a ca. 100 ka eruptive history of the La Garita
Authors
Leah E. Morgan, Samuel Johnstone, Amy K. Gilmer, Michael A. Cosca, Ren A. Thompson
Characterizing the catastrophic 2017 Mud Creek Landslide, California, using repeat Structure-from-Motion (SfM) photogrammetry
Along the rugged coast of Big Sur, California, the Mud Creek landslide failed catastrophically on May 20, 2017 and destroyed over 400 m of scenic California State Highway 1. We collected structure-from-motion (SfM) photogrammetry data using airborne platforms that, when combined with existing airborne lidar data, revealed that the area exhibited significant topographic change and displacement befo
Authors
Jonathan Warrick, Andrew C. Ritchie, Mark E. Reid, Kevin M. Schmidt, Joshua B. Logan