Shannon A Mahan

Datos Biográficos

ID4053814
NOMBREShannon A Mahan
NOMBRESShannon A
APELLIDOMahan
FIRMAMAHAN S A
AFILIACIONESUnited States Geological Survey
ORCID0000-0001-5214-7774
VERIFICADOSí
TOTAL DE OBRAS38
TOTAL DE CITAS29
TOTAL COMO AUTOR38
TOTAL COMO EDITOR0
PRIMER AÑO DE PUBLICACIÓN1997
AÑO MÁS RECIENTE DE PUBLICACIÓN2026
ÍNDICE H3

  • Geochronologic data reveal Late Pleistocene to Holocene debris-flow history and wildfire association within Whiskeytown National Recreation Area, Klamath Mountains, northern California

    Open AccessJohn R Wood, John R “Jack” Wood et al.ARTICLEQuaternary Research2026

    Understanding the local to regional history of extreme events such as debris flows and floods provides context to plan for and mitigate these hazards to life, property, and infrastructure. The Klamath Mountains of northwestern California have experienced both debris flows and devastating wildfires. Whiskeytown National Recreation Area (WHIS) is at the heart of this range and has a wealth of debris flow–related landforms. Gaining an understanding …

  • Age reassignment using luminescence dating for The Mammoth Site, Black Hills, South Dakota, USA

    Open AccessShannon A Mahan, Jim I Mead et al.ARTICLEQuaternary Research2026

    The Mammoth Site (MS) at Hot Springs, South Dakota, provides a unique opportunity to reconstruct paleoenvironmental conditions on the Northern Great Plains of the United States. Previous radiocarbon analyses of mammoth bone apatite suggested the MS sinkhole was deposited ∼42–23 cal ka BP. However, two U-series ages and one thermoluminescence (TL) age ranged between 150 and 101 ka, suggesting the bones were considerably older. We analyzed six samp…

  • Exploring the myth of Lake Saveh on the Iranian Plateau

    Open AccessHamid Nazari, Jean-François Ritz et al.ARTICLEThe Holocene2026Referencias: 18

    This study presents a multidisciplinary reconstruction of a paleolake’s Holocene evolution in Iran’s Central Plateau, synthesizing sedimentological, geochronological, archeological, and historical evidence. Our findings confirm the existence of a large paleolake (~16–14 ka) in the northern plateau, with episodic desiccation and recharge. Lake levels declined by 250 m between 11.5 and 8.2 ka, stabilizing at ~850 m elevation. The 8.2 ka climatic co…

  • Luminescence Dating of Stone Structures in the Northeastern United States

    Open AccessJ K Feathers, Shannon A MahanARTICLEAmerican Antiquity2025Referencias: 36

    There is no consensus on who built the numerous stone structures that dot the archaeological landscape in the northeastern United States. Professional archaeologists traditionally have attributed them to colonial farmers, but increasing numbers of archaeologists have joined many nonprofessional groups and Native Americans in arguing for Indigenous origins. Better understanding of these structures can be obtained by determining how old they are. T…

  • Pliocene–Pleistocene hydrology and pluvial lake during Marine Isotope Stages 5a and 4, Deep Springs Valley, western Great Basin, Inyo County, California

    Open AccessJ R Knott, Shannon A Mahan et al.ARTICLEQuaternary Research2023

    Deep Springs Valley (DSV) is a hydrologically isolated valley between the White and Inyo mountains that is commonly excluded from regional paleohydrology and paleoclimatology. Previous studies showed that uplift of Deep Springs ridge (informal name) by the Deep Springs fault defeated streams crossing DSV and hydrologically isolated the valley sometime after eruption of the Pleistocene Bishop Tuff (0.772 Ma). Here, we present tephrochronology and …

  • Luminescence ages and new interpretations of the timing and deposition of Quaternary sediments at Natural Trap Cave, Wyoming

    Open AccessShannon A Mahan, John R Wood et al.ARTICLEQuaternary International2023

    Natural Trap Cave, located in the Big Horn Mountains of north-central Wyoming, has a history of trapping and preserving a range of North American fauna that plummeted into the deep vertical entrance. These animal remains were buried and preserved within sediments of the main chamber and, in turn, have helped elucidate the procession of faunal dynamics during the latest glacial cycle. The cave location, south of the Laurentide and Cordilleran Ice …

  • An age-depth model and revised stratigraphy of vertebrate-bearing units in Natural Trap Cave, Wyoming

    Open AccessDavid M Lovelace, Cory M Redman et al.ARTICLEQuaternary International2023

    Excavations at Natural Trap Cave (NTC) began in the mid-1970's and quickly yielded evidence of a diverse steppe fauna that existed during the Last Glacial Maximum (MIS 2) along the western slope of the Bighorn Mountains in north central Wyoming. NTC is a karst pit cave with a 24.5 m vertical drop into a roughly 43 m wide bell-shaped ‘Main Chamber’ and during the course of early excavations a plugged entrance to a fossil-bearing ‘Lower Chamber’ wa…

  • The Geochronological and Geoarchaeological Context of the Clovis-Age La Prele Mammoth Site (48CO1401), Converse County, Wyoming

    Sarah A Allaun, Todd A Surovell et al.ARTICLEPaleoAmerica2023Referencias: 20

    The La Prele Mammoth site (48CO1401), located in Converse County, Wyoming, contains a Clovis-age occupation associated with the remains of a subadult mammoth (Mammuthus columbi). In this paper, we present the geochronological and geoarchaeological context of the site. The La Prele Mammoth site is buried in an alluvial terrace of La Prele Creek, a tributary of the North Platte River, which acts as an important migration corridor through the Rocky …

  • Confirming a Cultural Association at the La Prele Mammoth Site (48CO1401), Converse County, Wyoming

    Open AccessMadeline E Mackie, Todd A Surovell et al.ARTICLEAmerican Antiquity2020Citada por: 13Referencias: 58

    Archaeologists have long subjected Clovis megafauna kill/scavenge sites to the highest level of scrutiny. In 1987, a Columbian mammoth (Mammuthus columbi) was found in spatial association with a small artifact assemblage in Converse County, Wyoming. However, due to the small tool assemblage, limited nature of the excavations, and questions about the security of the association between the artifacts and mammoth remains, the site was never included…

  • Late Quaternary loess and soils on uplands in the Canyonlands and Mesa Verde areas, Utah and Colorado

    Open AccessMarith C Reheis, Harland L Goldstein et al.ARTICLEQuaternary Research2018

    Thin loess deposits on the uplands of the southeastern Colorado Plateau have previously not been well studied. We sampled deposits and soils from trenches on Hatch Point (HP) mesa near Canyonlands National Park, Utah, and from two outcrops in Mesa Verde National Park, Colorado. At HP, the oldest buried unit yielded 2 optically stimulated luminescence (OSL) ages of 10,370 and 7555 yr; the middle unit yielded 10 OSL ages from 6220 to 1385 yr; and t…

  • The Carolina Sandhills

    Open AccessChristopher S Swezey, Bradley A Fitzwater et al.ARTICLEQuaternary Research2016

    The Carolina Sandhills is a physiographic region of the Atlantic Coastal Plain province in the southeastern United States. In Chesterfield County (South Carolina), the surficial sand of this region is the Pinehurst Formation, which is interpreted as eolian sand derived from the underlying Cretaceous Middendorf Formation. This sand has yielded three clusters of optically stimulated luminescence ages: (1) 75 to 37 thousand years ago (ka), coinciden…

  • Impacts of climate change on the formation and stability of late Quaternary sand sheets and falling dunes, Black Mesa region, southern Colorado Plateau, USA

    Open AccessAmy L Ellwein, Shannon A Mahan et al.ARTICLEQuaternary International2015

  • Dynamic response of desert wetlands to abrupt climate change

    Open AccessKathleen Springer, Craig R Manker et al.ARTICLEQuaternary International2015

  • Luminescence dating of anthropogenic features of the San Luis Valley, Colorado

    Open AccessShannon A Mahan, Rebecca A Donlan et al.ARTICLEQuaternary International2015

  • Variables and potential models for the bleaching of luminescence signals in fluvial environments

    Open AccessHarrison J Gray, Shannon A MahanARTICLEQuaternary International2015

  • The Pleistocene climate record in alluvial fans of the Mojave desert

    Open AccessDavid M Miller, Andrew Cyr et al.ARTICLEQuaternary International2015

  • The 9th New World Luminescence Dating Workshop

    Open AccessShannon A Mahan, Michelle S Nelson et al.ARTICLEQuaternary International2015

  • User Guide for Luminescence Sampling in Archaeological and Geological Contexts

    Open AccessM S Nelson, Harrison J Gray et al.ARTICLEAdvances in Archaeological Practice2015Citada por: 10Referencias: 16

    Luminescence dating provides a direct age estimate of the time of last exposure of quartz or feldspar minerals to light or heat and has been successfully applied to deposits, rock surfaces, and fired materials in a number of archaeological and geological settings. Sampling strategies are diverse and can be customized depending on local circumstances, although all sediment samples need to include a light-safe sample and material for dose-rate dete…

  • Geochronology and paleoenvironment of pluvial Harper Lake, Mojave Desert, California, USA

    Open AccessAnna L Garcia, J R Knott et al.ARTICLEQuaternary Research2014

    Accurate reconstruction of the paleo-Mojave River and pluvial lake (Harper, Manix, Cronese, and Mojave) system of southern California is critical to understanding paleoclimate and the North American polar jet stream position over the last 500 ka. Previous studies inferred a polar jet stream south of 35°N at 18 ka and at ~ 40°N at 17–14 ka. Highstand sediments of Harper Lake, the upstream-most pluvial lake along the Mojave River, have yielded unca…

  • A geochronologic framework for the Ziegler Reservoir fossil site, Snowmass Village, Colorado

    Open AccessShannon A Mahan, Harrison J Gray et al.ARTICLEQuaternary Research2014

    The Ziegler Reservoir fossil site near Snowmass Village, Colorado (USA), 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 cosmogenic 10 Be and 26 Al ages on a boulder on the cres…

  • Summary of the Snowmastodon Project Special Volume A high-elevation, multi-proxy biotic and environmental record of MIS 6–4 from the Ziegler Reservoir fossil site, Snowmass Village, Colorado, USA

    Open AccessIan M Miller, Jeffrey S Pigati et al.ARTICLEQuaternary Research2014

    In North America, terrestrial records of biodiversity and climate change that span Marine Oxygen Isotope Stage (MIS) 5 are rare. Where found, they provide insight into how the coupling of the ocean–atmosphere system is manifested in biotic and environmental records and how the biosphere responds to climate change. In 2010–2011, construction at Ziegler Reservoir near Snowmass Village, Colorado (USA) revealed a nearly continuous, lacustrine/wetland…

  • Constraints on the age of the Great Sand Dunes, Colorado, from subsurface stratigraphy and OSL dates

    Open AccessRichard F Madole, Shannon A Mahan et al.ARTICLEQuaternary Research2013

    The age of the Great Sand Dunes has been debated for nearly 150 yr. Seven ages ranging from Miocene to late Holocene have been proposed for them. This paper presents new information–chiefly subsurface stratigraphic data, OSL dates, and geomorphic evidence–that indicates that the Great Sand Dunes began to form in the latter part of the middle Pleistocene. The dunes overlie a thick wedge of piedmont-slope deposits, which in turn overlies sediment o…

  • Quaternary eolian dunes in the Savannah River Valley, Jasper County, South Carolina, USA

    Open AccessChristopher S Swezey, Arthur P Schultz et al.ARTICLEQuaternary Research2013

    Sand hills in the Savannah River valley in Jasper County (South Carolina, USA) are interpreted as the remnants of parabolic eolian dunes composed of sand derived from the Savannah River and stabilized by vegetation under prevailing climate conditions. Optically stimulated luminescence ages reveal that most of the dunes were active ca. 40 to 19 ka ago, coincident with the last glacial maximum (LGM) through early deglaciation. Modern surface winds …

  • A Non-Destructive Method for Dating Human Remains

    Open AccessWarren Lail, David M Sammeth et al.ARTICLEAdvances in Archaeological Practice2013Referencias: 17

    The skeletal remains of several Native Americans were recovered in an eroded state from a creek bank in northeastern New Mexico. Subsequently stored in a nearby museum, the remains became lost for almost 36 years. In a recent effort to repatriate the remains, it was necessary to fit them into a cultural chronology in order to determine the appropriate tribe(s) for consultation pursuant to the Native American Grave Protection and Repatriation Act …

  • Holocene dune formation at Ash Meadows National Wildlife Area, Nevada, USA

    Open AccessNicholas Lancaster, Shannon A MahanARTICLEQuaternary Research2012

    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 ka, with further accumulation around 0.2 ka. Prior studies (e…