Publications
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Paleoseismology of the Southern Section of the Black Mountains and Southern Death Valley Fault Zones, Death Valley, United States Paleoseismology of the Southern Section of the Black Mountains and Southern Death Valley Fault Zones, Death Valley, United States
The Death Valley Fault System (DVFS) is part of the southern Walker Lane–eastern California shear zone. The normal Black Mountains Fault Zone (BMFZ) and the right-lateral Southern Death Valley Fault Zone (SDVFZ) are two components of the DVFS. Estimates of late Pleistocene-Holocene slip rates and recurrence intervals for these two fault zones are uncertain owing to poor relative age...
Authors
Marsha S. Sohn, Jeffrey R. Knott, Shannon Mahan
A geochronologic framework for the Ziegler Reservoir fossil site, Snowmass Village, Colorado A geochronologic framework for the Ziegler Reservoir fossil site, Snowmass Village, Colorado
The Ziegler Reservoir fossil site near Snowmass Village, Colorado, provides a unique opportunity to reconstruct high-altitude paleoenvironmental conditions in the Rocky Mountains during the last interglacial period. We used four different techniques to establish a chronological framework for the site. Radiocarbon dating of lake organics, bone collagen, and shell carbonate, and in situ...
Authors
Shannon Mahan, Harrison J. Gray, Jeffrey S. Pigati, Jim Wilson, Nathaniel A. Lifton, James B. Paces, Maarten Blaauw
The notion of climate-driven strath-terrace production assessed via dissimilar stream-process response to late Quaternary climate The notion of climate-driven strath-terrace production assessed via dissimilar stream-process response to late Quaternary climate
Previous research results from the Gabilan Mesa are combined with new optically stimulated luminescence (OSL) age estimates and sedimentological analyses with the aim of identifying factors that inhibit climate-driven strath-terrace production, and factors that make possible strath-terrace production independent of climate forcing. The factors are revealed by comparing the...
Authors
Antonio F. Garcia, Shannon Mahan
U.S. Geological Survey Science for the Wyoming Landscape Conservation Initiative: 2012 annual report U.S. Geological Survey Science for the Wyoming Landscape Conservation Initiative: 2012 annual report
Southwest Wyoming contains abundant energy resources, wildlife, habitat, open spaces, and outdoor recreational opportunities. Although energy exploration and development have been taking place in the region since the late 1800s, the pace of development for fossil fuels and renewable energy increased significantly in the early 2000s. This and the associated urban and exurban development...
Authors
Zachary H. Bowen, Cameron L. Aldridge, Patrick J. Anderson, Timothy J. Assal, Carleton R. Bern, Laura Biewick, Gregory K. Boughton, Natasha B. Carr, Anna D. Chalfoun, Geneva W. Chong, Melanie L. Clark, Bradford C. Fedy, Katharine Foster, Steven L. Garman, Steve Germaine, Matthew G. Hethcoat, Collin G. Homer, Matthew J. Kauffman, Douglas Keinath, Natalie Latysh, Daniel J. Manier, Robert R. McDougal, Cynthia P. Melcher, Kirk A. Miller, Jessica Montag, Christopher J. Potter, Spencer Schell, Sarah L. Shafer, David B. Smith, Michael J. Sweat, Anna B. Wilson
Carnivore distributions across chaparral habitats exposed to wildfire and rural housing in southern California Carnivore distributions across chaparral habitats exposed to wildfire and rural housing in southern California
Chaparral and coastal sage scrub habitats in southern California support biologically diverse plant and animal communities. However, native plant and animal species within these shrubland systems are increasingly exposed to human-caused wildfires and an expansion of the human–wildland interface. Few data exist to evaluate the effects of fire and anthropogenic pressures on plant and...
Authors
P.A. Schuette, J.E. Diffendorfer, D.H. Deutschman, S. Tremor, W. Spencer
Replacement cost valuation of Northern Pintail (Anas acuta) subsistence harvest in Arctic and sub-Arctic North America Replacement cost valuation of Northern Pintail (Anas acuta) subsistence harvest in Arctic and sub-Arctic North America
Migratory species provide economically beneficial ecosystem services to people throughout their range, yet often, information is lacking about the magnitude and spatial distribution of these benefits at regional scales. We conducted a case study for Northern Pintails (hereafter pintail) in which we quantified regional and sub-regional economic values of subsistence harvest to indigenous
Authors
Joshua H. Goldstein, Wayne E. Thogmartin, Kenneth J. Bagstad, James A. Dubovsky, Brady J. Mattsson, Darius J. Semmens, Laura López-Hoffman, James E. Diffendorfer
Mapping mountain pine beetle mortality through growth trend analysis of time-series landsat data Mapping mountain pine beetle mortality through growth trend analysis of time-series landsat data
Disturbances are key processes in the carbon cycle of forests and other ecosystems. In recent decades, mountain pine beetle (MPB; Dendroctonus ponderosae) outbreaks have become more frequent and extensive in western North America. Remote sensing has the ability to fill the data gaps of long-term infestation monitoring, but the elimination of observational noise and attributing changes
Authors
Lu Liang, Yanlei Chen, Todd Hawbaker, Zhi-Liang Zhu, Peng Gong
Modeling the influence of organic acids on soil weathering Modeling the influence of organic acids on soil weathering
Biological inputs and organic matter cycling have long been regarded as important factors in the physical and chemical development of soils. In particular, the extent to which low molecular weight organic acids, such as oxalate, influence geochemical reactions has been widely studied. Although the effects of organic acids are diverse, there is strong evidence that organic acids...
Authors
Corey R. Lawrence, Jennifer W. Harden, Kate Maher
Validating a method for transferring social values of ecosystem services between public lands in the Rocky Mountain region Validating a method for transferring social values of ecosystem services between public lands in the Rocky Mountain region
With growing pressures on ecosystem services, social values attributed to them are increasingly important to land management decisions. Social values, defined here as perceived values the public ascribes to ecosystem services, particularly cultural services, are generally not accounted for through economic markets or considered alongside economic and ecological values in ecosystem...
Authors
Benson C. Sherrouse, Darius J. Semmens
Pluvial lakes in the Great Basin of the western United States: a view from the outcrop Pluvial lakes in the Great Basin of the western United States: a view from the outcrop
Paleo-lakes in the western United States provide geomorphic and hydrologic records of climate and drainage-basin change at multiple time scales extending back to the Miocene. Recent reviews and studies of paleo-lake records have focused on interpretations of proxies in lake sediment cores from the northern and central parts of the Great Basin. In this review, emphasis is placed on...
Authors
Marith C. Reheis, Kenneth D. Adams, Charles G. Oviatt, Steven N. Bacon
Methodological developments in US state-level Genuine Progress Indicators: toward GPI 2.0 Methodological developments in US state-level Genuine Progress Indicators: toward GPI 2.0
The Genuine Progress Indicator (GPI) has emerged as an important monetary measure of economic well-being. Unlike mainstream economic indicators, primarily Gross Domestic Product (GDP), the GPI accounts for both the benefits and costs of economic production across diverse economic, social, and environmental domains in a more comprehensive manner. Recently, the GPI has gained traction in...
Authors
Kenneth J. Bagstad, Gunseli Berik, Erica J. Brown Gaddis
Natural uranium and strontium isotope tracers of water sources and surface water-groundwater interactions in arid wetlands: Pahranagat Valley, Nevada, USA Natural uranium and strontium isotope tracers of water sources and surface water-groundwater interactions in arid wetlands: Pahranagat Valley, Nevada, USA
Near-surface physical and chemical process can strongly affect dissolved-ion concentrations and stable isotope compositions of water in wetland settings, especially under arid climate conditions. In contrast, heavy radiogenic isotopes of strontium (87Sr/86Sr) and uranium (234U/238U) remain largely unaffected and can be used to help identify unique signatures from different sources and...
Authors
James B. Paces, Frederic C. Wurster