Publications
Laboratory related Publications are listed below.
Filter Total Items: 73
Late Quaternary stream piracy and strath terrace formation along the Belle Fourche and lower Cheyenne Rivers, South Dakota and Wyoming Late Quaternary stream piracy and strath terrace formation along the Belle Fourche and lower Cheyenne Rivers, South Dakota and Wyoming
Stream piracy substantially affected the geomorphic evolution of the Missouri River watershed and drainages within, including the Little Missouri, Cheyenne, Belle Fourche, Bad, and White Rivers. The ancestral Cheyenne River eroded headward in an annular pattern around the eastern and southern Black Hills and pirated the headwaters of the ancestral Bad and White Rivers after ~ 660 ka. The
Authors
John F. Stamm, Robert R. Hendricks, J. Foster Sawyer, Shannon Mahan, Brent J. Zaprowski, Nicholas M. Geibel, David C. Azzolini
Late Pleistocene and Holocene uplift history of Cyprus: implications for active tectonics along the southern margin of the Anatolian microplate Late Pleistocene and Holocene uplift history of Cyprus: implications for active tectonics along the southern margin of the Anatolian microplate
The nature of the southern margin of the Anatolian microplate during the Neogene is complex, controversial and fundamental in understanding active plate-margin tectonics and natural hazards in the Eastern Mediterranean region. Our investigation provides new insights into the Late Pleistocene uplift history of Cyprus and the Troodos Ophiolite. We provide isotopic (14C) and radiogenic...
Authors
R.W. Harrison, E. Tsiolakis, B. D. Stone, A. Lord, J. P. McGeehin, S. A. Mahan, P. Chirico
Geochronologic evidence for a possible MIS-11 emergent barrier/beach-ridge in southeastern Georgia, USA Geochronologic evidence for a possible MIS-11 emergent barrier/beach-ridge in southeastern Georgia, USA
Predominantly clastic, off-lapping, transgressive, near-shore marine sediment packages that are morphologically expressed as subparallel NE-trending barriers, beach ridges, and associated back-barrier areas, characterize the near-surface stratigraphic section between the Savannah and the Ogeechee Rivers in Effingham County, southeastern Georgia. Each barrier/back-barrier (shoreline)...
Authors
H. W. Markewich, M.J. Pavich, A. P. Schultz, S. A. Mahan, W. B. Aleman-Gonzalez, P.R. Bierman
Low footwall accelerations and variable surface rupture behavior on the Fort Sage Mountains fault, northeast California Low footwall accelerations and variable surface rupture behavior on the Fort Sage Mountains fault, northeast California
The Fort Sage Mountains fault zone is a normal fault in the Walker Lane of the western Basin and Range that produced a small surface rupture (
Authors
Richard W. Briggs, Steven G. Wesnousky, James N. Brune, Matthew D. Purvance, Shannon Mahan
Paleontology and geochronology of the Long Beach core sites and monitoring wells, Long Beach, California Paleontology and geochronology of the Long Beach core sites and monitoring wells, Long Beach, California
The U.S. Geological Survey's Focus on Quaternary Stratigraphy in Los Angeles (FOQUS-LA) project was a cooperative coring program between Federal, State, and local agencies. It was designed to provide a better understanding of earthquake potentials and to develop a stratigraphic model of the western Los Angeles Basin in California. The biostratigraphic, geochronologic, and paleoecologic...
Authors
Kristin McDougall, John Hillhouse, Charles Powell, Shannon Mahan, Elmira Wan, Andrei M. Sarna-Wojcicki
The influence of upper-crust lithology on topographic development in the central Coast Ranges of California The influence of upper-crust lithology on topographic development in the central Coast Ranges of California
A fundamental geological tenet is that as landscapes evolve over graded to geologic time, geologic structures control patterns of topographic distribution in mountainous areas such that terrain underlain by competent rock will be higher than terrain underlain by incompetent rock. This paper shows that in active orogens where markedly weak and markedly strong rocks are juxtaposed along...
Authors
A.F. Garcia, Shannon Mahan
Holocene dune formation at Ash Meadows National Wildlife Area, Nevada, USA Holocene dune formation at Ash Meadows National Wildlife Area, Nevada, USA
Small isolated dune fields in the northern Mojave Desert are important centers of biodiversity and archaeological occupation sites. Currently dunes at Ash Meadows, Nevada, are stabilized by vegetation and are experiencing erosion of their upwind margins, indicating a negative sediment budget. New OSL ages from dunes at Ash Meadows indicate continuous eolian accumulation from 1.5 to 0.8...
Authors
Nicholas Lancaster, Shannon Mahan
Basin-floor Lake Bonneville stratigraphic section as revealed in paleoseismic trenches at the Baileys Lake site, West Valley fault zone, Utah Basin-floor Lake Bonneville stratigraphic section as revealed in paleoseismic trenches at the Baileys Lake site, West Valley fault zone, Utah
Recent paleoseismic trenching on the Granger fault of the West Valley fault zone in Salt Lake County, Utah, exposed a nearly complete section of late Pleistocene Lake Bonneville deposits, and highlights challenges related to accurate interpretation of basin-floor stratigraphy in the absence of numerical age constraints. We used radiocarbon and luminescence dating as well as ostracode
Authors
Michael D. Hylland, Christopher B. DuRoss, Greg N. McDonald, Susan S. Olig, Charles G. Oviatt, Shannon A. Mahan, Anthony J. Crone, Stephen Personius
Building on previous OSL dating techniques for gypsum: a case study from Salt Basin playa, New Mexico and Texas Building on previous OSL dating techniques for gypsum: a case study from Salt Basin playa, New Mexico and Texas
The long term stability and reliability of the luminescence signal for gypsum has not been well documented or systematically measured until just recently. A review of the current literature for luminescence dating of gypsum is compiled here along with original efforts at dating an intact and in-situ bed of selenite gypsum at Salt Basin Playa, New Mexico and Texas. This effort differs...
Authors
Shannon Mahan, John Kay
Using luminescence dating of coarse matrix material to estimate the slip rate of the Astaneh fault, Iran Using luminescence dating of coarse matrix material to estimate the slip rate of the Astaneh fault, Iran
In this paper, we present optically and infrared stimulated luminescence (OSL and IRSL) ages for four samples from alluvial fan surfaces in the Astaneh Valley. This valley is located in the north-east part of the Alborz range in Iran. Our morphologic interpretations recognize at least three generations of fans in the study area, all of which have been displaced along the left-lateral...
Authors
M. Rizza, Shannon A. Mahan, J.-F. Ritz, H. Nazari, J. Hollingsworth, R. Salamati
Barrier island response to late Holocene climate events, North Carolina, USA Barrier island response to late Holocene climate events, North Carolina, USA
The Outer Banks barrier islands of North Carolina, USA, contain a geologic record of inlet activity that extends from ca. 2200 cal yr BP to the present, and can be used as a proxy for storm activity. Optically stimulated luminescence (OSL) dating (26 samples) of inlet-fill and flood tide delta deposits, recognized in cores and geophysical data, provides the basis for understanding the...
Authors
D. J. Mallinson, C. W. Smith, S. Mahan, S.J. Culver, K. McDowell
The angus mammoth: A decades-old scientific controversy resolved The angus mammoth: A decades-old scientific controversy resolved
The Angus Mammoth site in south-central Nebraska has been controversial since its discovery in 1931 when a fluted artifact was reported to be associated with the mammoth. For nearly 80 years it has not been known if Angus was a paleontological site predating the human occupation of North America as has been asserted by some geologists and paleontologists, or an archaeological site dating...
Authors
Steven R. Holen, D.W. May, Shannon A. Mahan