Publications
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Retreat and regrowth of the Greenland Ice Sheet during the Last Interglacial as simulated by the CESM2-CISM2 coupled climate–ice sheet model
During the Last Interglacial, approximately 129 to 116 ka (thousand years ago), the Arctic summer climate was warmer than the present, and the Greenland Ice Sheet retreated to a smaller extent than its current state. Previous model-derived and geological reconstruction estimates of the sea-level contribution of the Greenland Ice Sheet during the Last Interglacial vary widely. Here, we conduct a tr
Authors
Aleah Sommers, Bette L. Otto-Bliesner, William Lipscomb, Marcus Lofverstrom, Sarah Shafer, Patrick J. Bartlein, Esther C. Brady, Erik Kluzek, Gunter Leguy, Katherine Thayer-Calder, Robert Tomas
Downhill from Austin and Ely to Las Vegas: U-Pb detrital zircon suites from the Eocene–Oligocene Titus Canyon Formation and associated strata, Death Valley, California
In a reconnaissance investigation aimed at interrogating the changing topography and paleogeography of the western United States prior to Basin and Range faulting, a preliminary study made use of U-Pb ages of detrital zircon suites from 16 samples from the Eocene–Oligocene Titus Canyon Formation, its overlying units, and correlatives near Death Valley. The Titus Canyon Formation unconformably over
Authors
Elizabeth L. Miller, Mark Raftrey, Jens-Erik Lundstern
Magmatism, migrating topography, and the transition from Sevier shortening to Basin and Range extension, western United States
The paleogeographic evolution of the western U.S. Great Basin from the Late Cretaceous to the Cenozoic is critical to understanding how the North American Cordillera at this latitude transitioned from Mesozoic shortening to Cenozoic extension. According to a widely applied model, Cenozoic extension was driven by collapse of elevated crust supported by crustal thicknesses that were potentially doub
Authors
Jens-Erik Lundstern, Elizabeth L. Miller
Evidence of glacial activity during MIS 4 in the Rocky Mountains, Colorado, USA
The Ziegler Reservoir fossil site near Snowmass Village, Colorado, provides a rare opportunity to examine environmental conditions in the Rocky Mountains during marine isotope stage (MIS) 4 (71–57 ka). Although recognized as a global-scale cold event, MIS 4 is typically absent from Rocky Mountain glacial chronologies because the geologic evidence was covered or destroyed during the subsequent, and
Authors
Jeffrey S. Honke, Jeffrey S. Pigati, J. Michael Daniels
Were humans and mammoths on the Channel Islands at the same time?
No abstract available.
Authors
Daniel R. Muhs
Growth of the wildland-urban interface within and around U.S. National Forests and Grasslands, 1990-2010
The wildland-urban interface (WUI), where housing is in close proximity to or intermingled with wildland vegetation, is widespread throughout the United States, but it is unclear how this type of housing development affects public lands. We used a national dataset to examine WUI distribution and growth (1990–2010) in proximity to National Forests and created a typology to characterize each Nationa
Authors
Miranda H. Mockrin, Dave Helmers, Sebastian Martinuzzi, Todd Hawbaker, Volker C. Radeloff
Concentration-discharge relationships of dissolved rhenium in Alpine catchments reveal its use as a tracer of oxidative weathering
Oxidative weathering of sedimentary rocks plays an important role in the global carbon cycle. Rhenium (Re) has been proposed as a tracer of rock organic carbon (OCpetro) oxidation. However, the sources of Re and its mobilization by hydrological processes remain poorly constrained. Here we examine dissolved Re as a function of water discharge, using samples collected from three alpine catchments th
Authors
Robert Hilton, Jens M. Turowski, Matthew Winnick, Mathieu Dellinger, Patrick Schleppi, Kenneth H. Williams, Corey Lawrence, Katharine Maher, Martin West, Amanda Hayton
Geologic and hydrogeologic characteristics of the White River Formation, Lance Formation, and Fox Hills Sandstone, northern greater Denver Basin, southeastern Laramie County, Wyoming
In cooperation with the Wyoming State Engineer’s Office, the U.S. Geological Survey studied the geologic and hydrogeologic characteristics of Cenozoic and Upper Cretaceous strata at a location in southeastern Laramie County within the Wyoming part of the Cheyenne Basin, the northern subbasin of the greater Denver Basin. The study aimed to improve understanding of the aquifers/aquifer systems in th
Authors
Timothy T. Bartos, Devin L. Galloway, Laura L. Hallberg, Marieke Dechesne, Sharon F. Diehl, Seth L. Davidson
Tectonic influence on axial-transverse sediment routing in the Denver Basin
Detrital zircon U-Pb and (U-Th)/He ages from latest Cretaceous–Eocene strata of the Denver Basin provide novel insights into evolving sediment sourcing, recycling, and dispersal patterns during deposition in an intracontinental foreland basin. In total, 2464 U-Pb and 78 (U-Th)/He analyses of detrital zircons from 21 sandstone samples are presented from outcrop and drill core in the proximal and di
Authors
Glenn R Sharman, Daniel F. Stockli, Peter Flaig, Robert Raynolds, Marieke Dechesne, Jacob A Covault
How will baseflow respond to climate change in the Upper Colorado River Basin?
Baseflow is critical to sustaining streamflow in the Upper Colorado River Basin. Therefore, effective water resources management requires estimates of baseflow response to climatic changes. This study provides the first estimates of projected baseflow changes from historical (1984 – 2012) to thirty-year periods centered around 2030, 2050, and 2080 under warm/wet, median, and hot/dry climatic condi
Authors
Olivia L. Miller, Matthew P. Miller, Patrick Cullen Longley, Jay R. Alder, Lindsay A. Bearup, Tom Pruitt, Daniel Jones, Annie L. Putman, Christine Rumsey, Tim S. McKinney
Rapa Nui (Easter Island) Rano Raraku crater lake basin: Geochemical characterization and implications for the Ahu-Moai Period
Rano Raraku, the crater lake constrained by basaltic tuff that served as the primary quarry used to construct the moai statues on Rapa Nui (Easter Island), has experienced fluctuations in lake level over the past centuries. As one of the only freshwater sources on the island, understanding the present and past geochemical characteristics of the lake water is critical to understand if the lake coul
Authors
Elena Argiriadis, Mara Bortolini, Natalie Kehrwald, Marco Roman, Clara Turetta, Shahpara Hanif, Evans Osayuki Erhendi, José Miguel Ramirez Aliaga, David B. McWethy, Amy E. Myrbo, Anibal Pauchard, Carlo Barbante, Dario Battistel
Lessons learned from development of natural capital accounts in the United States and European Union
The United States and European Union (EU) face common challenges in managing natural capital and balancing conservation and resource use with consumption of other forms of capital. This paper synthesizes findings from 11 individual application papers from a special issue of Ecosystem Services on natural capital accounting (NCA) and their application to the public and private sectors in the EU and
Authors
Kenneth J. Bagstad, Jane Carter Ingram, Carl D. Shapiro, Alessandra La Notte, Joachim Maes, Sara Vallecillo, Clyde F. Casey, Pierre D. Glynn, Mehdi Heris, Justin A. Johnson, Chris Lauer, John Matuszak, Kirsten L. L. Oleson, Stephen M. Posner, Charles Rhodes, Brian Voigt