Shannon A. Mahan
Geosciences and Environmental Change Science Center, Denver, CO
Activity
2025
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CHARACTERIZATION OF THE AGES OF SEDIMENT IN STINKING WATER CREEK, RIO BLANCO COUNTY, COLORADO, 2020-2021: INFORMATION ABOUT THE TIMING OF ARROYO CUTTING RELATIVE TO PERIODS OF LAND-USE CHANGE USING LUMINESCENCE
3 Geomorphology, Geoarchaeology, Soils, Surface Processes and Paleoclimate IMonday, 19 May 20258:00 AM - 9:45 AMCascade C
2024
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PEEKING UNDER BOULDERS IN PURSUIT OF DEBRIS FLOW GEOCHRONOLOGY AT WHISKEYTOWN NATIONAL RECREATION AREA
T230 Dating the Quaternary: Development and Application of Geochronological Tools in Geomorphology and ArchaeologyWednesday, 25 September 20248:00 AM - 12:00 PM212A
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REVISITING QUATERNARY FAULTING IN THE CENTRAL RIO GRANDE RIFT
T278 The Rio Grande Rift: Exploring Connections between Deformation, Magmatism, Metamorphism, Sedimentation, Mineralization, and Mantle-to-Surface Processes during Continental ExtensionWednesday, 25 September 20241:30 PM - 5:30 PM304A
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CONTROLS ON A ~50 M LATE PLEISTOCENE LAKE IN THE SALTON TROUGH
T181 Advances in Arid Lands Geomorphology (Posters)Tuesday, 24 September 20248:00 AM - 5:30 PMHall D
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SURPRISINGLY DECENT RESULTS AND LIKELY PALEOSEISMOLOGICAL HYPOTHESES (RALPHS) FROM SOME LESS THAN IDEAL SITES IN OREGON AND PUERTO RICO
T142 Faults and Floods in Western North America: In Memory of the Outstanding Contributions of Dr. Ralph E. KlingerMonday, 23 September 20241:30 PM - 5:30 PM210B
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USING SOIL DEVELOPMENT, SEDIMENTARY FACIES, AND LUMINESCENCE CHRONOLOGY TO INTERPRET DEBRIS-FLOW ALLUVIAL FAN DYNAMICS IN THE STRATIGRAPHIC RECORD
T142 Faults and Floods in Western North America: In Memory of the Outstanding Contributions of Dr. Ralph E. KlingerMonday, 23 September 20241:30 PM - 5:30 PM210B
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LATE HOLOCENE MULTI-FAULT RUPTURES ALONG THE PINTO MOUNTAIN AND MESQUITE LAKE FAULTS, EASTERN CALIFORNIA SHEAR ZONE, SOUTHERN MOJAVE DESERT, CALIFORNIA
T60 Earth Surface Processes in Tectonically Active and Unstable Regions IISunday, 22 September 20241:30 PM - 5:30 PM210B
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LUMINESCENCE SAMPLING OF PALEONTOLOGICAL SITES: WHAT TO KNOW BEFORE, DURING, AND AFTER
21 Paleontology in the West: Fossils, Localities, Research, and Education in the Rocky Mountain and Cordilleran RegionsThursday, 16 May 20248:00 AM - 12:00 PMMeeting Room 1
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LEAVE NO STONE UNTURNED: PRELIMINARY OSL DATES FROM BENEATH A GIANT ERRATIC BOULDER, NORTHEAST IOWA
27 D1. Recent Advances in Geoscience and Geoscience EducationThursday, 16 May 20241:30 PM - 5:30 PMMeeting Room 1
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THE CORRELATION OF RECENT SEISMICITY WITH THE TOKUL CREEK, CHERRY CREEK, MONROE, AND CARPENTER CREEK FAULTS MAPPED IN THE MONROE AND FALL CITY REGION OF THE CASCADE FOOTHILLS--KING AND SNOHOMISH COUNTY AREA OF WEST CENTRAL WASHINGTON
10 Using Geologic and Geophysical Data to Unravel Neotectonics and Long-term Deformation across Cascadia (Posters)Wednesday, 15 May 20249:00 AM - 5:30 PMGrand Ballroom
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DECODING THE PALIMPSEST: GEOMORPHOLOGY, SEDIMENTS, AND SOILS OF THE IOWAN EROSION SURFACE
27 Pleistocene-Age Continental Deposits Beyond the Glacial BorderTuesday, 23 April 202410:00 AM - 12:00 PMCoco Ballroom, Oasis CC
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COASTAL SUSTAINABILITY REFLECTED IN THE HOLOCENE EVOLUTION OF THE CENTRAL SOUTH CAROLINA COASTAL AREA
45 Past, Present, and Future Sea-level and Landscape Change on the U.S. Coast and Continental ShelfTuesday, 16 April 20241:30 PM - 5:30 PMSwannanoa
2023
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USING LUMINESCENCE DATING, COSMOGENIC DATING, AND SOIL STRATIGRAPHY TO PROVIDE CONTEXT FOR PALEOCLIMATE ARCHIVES FROM LAMINATED PEDOGENIC CARBONATE RINDS, CAPITOL REEF NATIONAL PARK REGION, UTAH (USA)
T221 Sedimentary Archives of Mountain Building from the Fault-Scarp to the Range-Front: Interpreting Colluvial Wedge and Alluvial Fan SystemsWednesday, 18 October 20238:00 AM - 12:00 PM321
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A MORE COMPLETE PALEOSEISMIC RECORD FOR THE WASATCH URBAN CORRIDOR– NEW DATA AND CHALLENGES FROM THE WEST VALLEY FAULT ZONE, SALT LAKE CITY, UTAH
T243 Sedimentary Archives of Mountain Building from the Fault-Scarp to the Range-Front: Interpreting Colluvial Wedge and Alluvial Fan Systems (Posters)Wednesday, 18 October 20238:00 AM - 5:30 PMHall B
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GEOCHRONOLOGY PERSPECTIVES AT THE FEDERAL LEVEL: MOTIVATION, AGES, PROGRESS (MAPS) ACROSS THE GLACIATED REGIONS OF THE UNITED STATES
T199 Quaternary Glaciations of the Great Lakes Region: Progress in Understanding Sediments, Landforms, Chronology, and Landscape Evolution through Space and TimeTuesday, 17 October 20231:30 PM - 5:30 PM317 / 318
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QUATERNARY PERMAFROST-FLUVIAL AND LACUSTRINE SEDIMENTS DEPOSITED DURING GLACIAL INTERVALS IN THE WATER SINKS DEPRESSION, A PROMINENT KARST SINKHOLE IN SILURIAN-DEVONIAN LIMESTONE, HIGHLAND COUNTY, VIRGINIA
T177 Karst Sedimentary, Paleoclimate, and Historical Records (Posters)Tuesday, 17 October 20238:00 AM - 5:30 PMHall B
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THE HARTWOOD MORAINE AND ASSOCIATED LANDFORMS IN SOUTHEASTERN NEW YORK STATE: A PREVIOUSLY UNRECOGNIZED HUDSON LOBE ICE-MARGIN OF THE LAURENTIDE ICE SHEET
T199 Quaternary Glaciations of the Great Lakes Region: Progress in Understanding Sediments, Landforms, Chronology, and Landscape Evolution through Space and TimeTuesday, 17 October 20231:30 PM - 5:30 PM317 / 318
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SANDS AND GRAVELS IN BUTLER CAVE (BATH COUNTY, VIRGINIA) ARE FLUVIAL FLOOD-PULSE DEPOSITS THAT ACCUMULATED IN PERMAFROST ENVIRONMENTS ~ 108,000–104,000 YEARS AGO (MIS 5D) AND ~ 52,000–27,000 YEARS AGO (MIS 3)
T85 Karst Hydrology and HydrogeologyMonday, 16 October 20238:00 AM - 12:00 PM303
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ACTIVE SHORTENING AND DIFFERENTIAL UPLIFT ACROSS THE SOUTHERN CASCADIA FOREARC: GEOMORPHIC EVIDENCE FOR PLEISTOCENE DISPLACEMENT ALONG THE ILLINOIS RIVER VALLEY FAULT
15 From High Grade to Low Grade: Honoring the Contributions of J. Douglas Yule Towards Understanding the Growth and Active Deformation of Western North AmericaThursday, 18 May 20238:00 AM - 12:00 PMWhitney Peak Ballroom 2
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STRATIGRAPHIC AND CHRONOLOGIC CONSTRAINTS FOR THE MAXIMUM AGE OF MIS 2 GLACIAL ONSET IN UPSTATE NEW YORK STATE, USA
2 Recent Advances in Glacial Geology, Geomorphology, Sedimentology, and Chronology IThursday, 4 May 20238:00 AM - 12:00 PMEC 311
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GEOLOGIC AND PALEOLIQUEFACTION CONSTRAINTS ON PAST SEISMICITY IN THE EPICENTRAL AREA OF THE 9 AUGUST 2020 M5.1 SPARTA, NORTH CAROLINA, EARTHQUAKE
3 Geological, Seismological, and Paleoseismological Research into Eastern North American EarthquakesFriday, 17 March 20238:00 AM - 10:00 AMLake Audubon
2022
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QUANTIFYING MODIFICATIONS IN HOLOCENE ALLUVIAL FAN MORPHOLOGY TO DETERMINE PALEOSEISMICITY OF THE PANAMINT VALLEY TRANSTENSIONAL RELAY (ECSZ)
175 D29. Recent Advances in Quaternary Geology and GeomorphologyTuesday, 11 October 20221:30 PM - 5:30 PM506
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HOW CHRONOSTRATIGRAPHIC DATA IMPROVES STREAM CLASSIFICATION IN WHITE CLAY CREEK, PA AND OTHER MID-ATLANTIC WATERSHEDS
T181 Physical and Biological Processes, Interactions, and Restoration in River SystemsTuesday, 11 October 20221:30 PM - 5:30 PM503
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COMING DOWN THE MOUNTAINS: INTERPRETATIONS OF TERRACE DEPOSITS AND DEBRIS FLOW SEDIMENTS IN CLEAR CREEK WATERSHED, WHISKEYTOWN NATIONAL RECREATION AREA, CALIFORNIA
T179 Quaternary Climate from the Great Plains to the Great Basin: Geomorphic and Sediment Records across “Great” LandscapesTuesday, 11 October 20221:30 PM - 5:30 PM505
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INVESTIGATING SLOW-MOVING, COMPLEX FAULTS WITH A COMBINATION OF GEOMORPHOLOGY, BEDROCK, AND SUBSURFACE DATASETS: AN EXAMPLE FROM THE SACRAMENTO – SAN JOAQUIN DELTA, NORTHERN CALIFORNIA
T149 What’s in a Slip Rate?Tuesday, 11 October 20228:00 AM - 12:00 PM407
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ROCK AVALANCHE RECORDS IN ZION NATIONAL PARK: TOWARD A BETTER UNDERSTANDING OF POTENTIALLY HAZARDOUS EROSION IN ZION CANYON
T179 Quaternary Climate from the Great Plains to the Great Basin: Geomorphic and Sediment Records across “Great” LandscapesTuesday, 11 October 20221:30 PM - 5:30 PM505
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FLUVIO-GLACIAL TERRACES OF THE UPPER GREEN RIVER BASIN SPANNING THE PAST ~2 MA: NEW DETRITAL-SANIDINE, COSMOGENIC-BURIAL, AND LUMINESCENCE AGE CONSTRAINTS
T164 Quaternary Climate from the Great Plains to the Great Basin: Geomorphic and Sediment Records across “Great” Landscapes (Posters)Tuesday, 11 October 20229:00 AM - 1:00 PMExhibit Hall F
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SURFICIAL GEOLOGY AND QUATERNARY FAULT MAP OF THE LAS VEGAS VALLEY, NEVADA
T93 Geologic Maps and Their Derivatives (Posters)Monday, 10 October 20229:00 AM - 1:00 PMExhibit Hall F
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DECODING THE RECORD OF SEDIMENT AVAILABILITY FROM BARRIER ISLAND GEOMORPHOLOGY AT FIRE ISLAND, NEW YORK
T122 Advances and New Voices in Marine and Coastal GeoscienceMonday, 10 October 20221:30 PM - 5:30 PM407
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TECTONOGEOMORPHIC MAPPING REVEALS THE LATE HOLOCENE RUPTURE HISTORY OF THE ASH HILL FAULT (ECSZ) AND POTENTIAL FOR SEISMOGENIC STRAIN TRANSFER
T3 Crustal Deformation: How and When? Linking Long-Term Landscape Signatures with Earthquakes and Seismic HazardSunday, 9 October 20228:00 AM - 12:00 PM507
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ADVANCES IN UNDERSTANDING THE RECENCY OF ACTIVITY AND POST-MIOCENE SLIP HISTORY OF THE NORTHWESTERN “PALOMAS” SECTION OF THE SAN GABRIEL FAULT, BLACK MOUNTAIN AND ALAMO MOUNTAIN 7.5’ QUADRANGLES, SOUTHERN CALIFORNIA
24 Cryptic and Slow-Moving Quaternary-Active Faults in the Western United States (Posters)Wednesday, 16 March 20228:30 AM - 6:00 PMStudent Union Ballroom A/B
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PLIOCENE DEVELOPMENT AND MIS-4 FRESHWATER LAKE DEPOSITS OF DEEP SPRINGS VALLEY, WESTERN GREAT BASIN, INYO COUNTY, CALIFORNIA: IMPLICATIONS FOR REGIONAL TECTONICS AND PALEOCLIMATE
11 Geology of Death Valley: Old versus New Ideas, Hypotheses, and TheoriesTuesday, 15 March 20221:30 PM - 5:30 PMCBC-A 110
2021
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VALLES CALDERA, NEW MEXICO, USA: DATING AND DEFINING THE RATE OF FORMATION OF SOILS AND WILDFIRE ACTIVITY USING LUMINESCENCE
T88 Advances in Geomorphology: Understanding How Interactions among Climatic, Tectonic, Fluvial, and Hillslope Processes Drive Topographic Change (Posters)Monday, 11 October 20219:00 AM - 1:00 PMExhibit Hall A
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THE ACTIVE WARWICK STRIKE-SLIP FAULT AND THE COLUMBIA HILLS THRUST FAULT OF THE YAKIMA FOLD AND THRUST BELT ACCOMMODATE VERTICAL-AXIS ROTATION IN THE CASCADIA BACKARC
T36 Recent to Long-Term Slip Histories of Active Faults and Folds in CascadiaSunday, 10 October 20211:30 PM - 5:30 PMA107–A109
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THE PACE OF DEGLACIATION AND POSTGLACIAL LANDSCAPE RESPONSE IN YOSEMITE VALLEY, CALIFORNIA
8 Understanding the Sierra Nevada Through New Regional Geologic and Geophysical Syntheses IIThursday, 13 May 20218:30 AM - 12:30 PMUNR Centers for Transformative Monitoring Programs (CTEMPS) Room
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LUMINESCENCE DATING OF SAND IN BUTLER CAVE (BURNSVILLE COVE, BATH AND HIGHLAND COUNTIES, VIRGINIA) REVEALS A SEDIMENTARY RECORD FROM THE LAST GLACIATION
20 Landscape Disturbances from Pleistocene to Present: A Look at Geomorphic Resiliency and Response in the Northeast U.S.Monday, 15 March 20211:30 PM - 5:30 PMTalcott
2020
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ON THE RELATIVE CONTRIBUTION OF LEGACY SEDIMENTS TO SOME MID-ATLANTIC VALLEY FILL DEPOSITS
T187 Anthropocene Sedimentology: Exploring Human-Sediment InteractionsThursday, 29 October 202010:00 AM - 12:00 PMMeeting Rooms
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COMPARISON OF TERRACE LEVELS, PALEO CLIMATE INCISION RATES, AND ARCHEOLOGICAL SITES NEAR MONTROSE, COLORADO
20 Geomorphic and Paleoclimate Records from the Intermountain WestTuesday, 5 May 20201:25 PM - 4:30 PMCascades E
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BRINGING THE ROCKY MOUNTAIN REGION TO LIGHT: A SUMMARY OF THE USGS LUMINESCENCE GEOCHRONOLOGY LAB SHARED PROJECTS, RESEARCH, AND NEW UTILITIES OF THE TECHNIQUE IN FEDERAL AND STATE COLLABORATIONS
14 Federal and State Geologists of the Rocky Mountain Section: Who Are They, What Are They Working On, and How Can Everyone Collaborate? (Posters)Tuesday, 5 May 20208:30 AM - 4:30 PMBallroom A
2017
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LATE HOLOCENE PALEOFLOODS ON THE MIDDLE FORK WILLAMETTE RIVER: IMPROVING HYDROLOGIC LOADING INPUT FOR USACE DAM SAFETY EVALUATIONS
T211 The Geological Signature of Natural Hazard Events ITuesday, 24 October 20178:00 AM - 12:00 PMChelan 5
2016
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LATE QUATERNARY LOESS AND SOILS ON UPLANDS IN THE CANYONLANDS AND MESA VERDE AREAS, UTAH AND COLORADO
T339 Aeolian Processes in Time and Space: Evidence from Landforms and Sediments (Posters)Wednesday, 28 September 20169:00 AM - 6:30 PMExhibit Hall E/F
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GEOLOGICAL DATING OF INDIGENOUS RESERVOIRS AND ADJUDICATION OF WATER RIGHTS, LAGUNA, NEW MEXICO
T198 Quaternary Geochronometers: Applications of Multi- Technique Approaches in Geomorphology and ArcheologyTuesday, 27 September 20168:00 AM - 12:00 PMRoom 405
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A COMPILATION OF OSL GEOCHRONOLOGY COLLECTED BY THE U.S. GEOLOGICAL SURVEY FROM SOUTHERN CALIFORNIA: WHAT THE DATES TELL US AND HOW THEY WILL BE USED
14 Unraveling Structural Complexity along the San Andreas Fault Zone, Southern California: Using Geochronology in Conjunction with Geologic and Geomorphic MappingTuesday, 5 April 20168:30 AM - 12:30 PMMeeting Room 203 C
2014
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GREAT GULLY REVISITED: NEW CONSTRAINTS ON THE GLACIAL CHRONOLOGY OF THE CENTRAL NEW YORK FINGER LAKES
6 Glaciers, Sediments, and Landforms of Northeast North America and BeyondSunday, 23 March 20148:00 AM - 12:00 PMCommonwealth Salons 1-2
2013
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EROSIONAL HISTORY OF THE NORTH PLATTE RIVER, CASPER, WYOMING
39 Quaternary Geology and Geomorphology (Posters)Sunday, 27 October 20139:00 AM - 6:30 PMHall D
2012
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CAN THE SNOWMASTODON LACUSTRINE SEDIMENT BE DATED USING OPTICALLY STIMULATED LUMINESCENCE? A CASE STUDY FROM SNOWMASS, ZIEGLER RESERVOIR, COLORADO
T116 A Healthy Dose of Quaternary Geochronology at the Shoreline: Applications of Luminescence and Other Dating Techniques to Resolving the Timing of Coastal, Estuarine, and Lake Shore ProcessesMonday, 5 November 20123:45 PM - 5:30 PM201AB
2010
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THE CONTINUING STORY OF THE ANGUS MAMMOTH CONTROVERSY: IRSL DATING TO THE RESCUE
T73 Applications of Optically Stimulated Luminescence (OSL) Dating in Studies of the Mode, Timing, and Rate of Geomorphological ProcessesSunday, 31 October 20101:30 PM - 5:30 PMRoom 406
2007
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HOLOCENE CHRONOLOGY AND STRATIGRAPHY OF THE CASPER DUNE FIELD, CASPER, WYOMING, U.S.A
185 Quaternary Geology/GeomorphologyWednesday, 31 October 20078:00 AM - 12:00 PM
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THE BENEFITS AND DIFFICULTIES OF USING THE STRATIGRAPHY OF LARGE RIVERS TO IDENTIFY REGIONAL PALEOCLIMATE EVENTS: CASE STUDY LOWER COLORADO RIVER
T98 Long Records of Paleoclimate in the Southern Deserts of North AmericaMonday, 29 October 20071:30 PM - 5:30 PM
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ASSESSING THE CHRONOSTRATIGRAPHY OF LATE PLEISTOCENE AND HOLOCENE COASTAL LITHOSOMES USING OPTICALLY STIMULATED LUMINESCENCE TECHNIQUES: INTRIGUING RESULTS FROM NC AND FL
24 Coastal and Marine Sedimentary Geology in the Southeastern United States: A Session in Honor of Dr. V.J. "Jim" HenryFriday, 30 March 20078:00 AM - 5:20 PM
2005
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CLIMATE LINKAGE WITH HILLSLOPE PROCESSES, HURRICANE ESCARPMENT, NORTHWESTERN ARIZONA
T216 Recent Advances in Numerical Dating Techniques for Developing Quantitative Chronostratigraphies in Arid and Semi-Arid EnvironmentsWednesday, 19 October 20058:00 AM - 12:00 PM
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OPTICALLY STIMULATED LUMINESCENCE DATING OF LOESS AND SAND SHEETS IN THE ANTON SCARP TRENCH, NORTHEAST COLORADO
8 Quaternary Tectonics and Earthquake Hazards in the Rocky Mountain RegionMonday, 23 May 20051:00 PM - 4:00 PM
2004
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A COMPARISON OF OSL AND TL TECHNIQUES AND AGES WITHIN THE QUATERNARY STRATIGRAPHY OF THE WHITE RIVER BADLANDS
T176 Evolution of the Great Plains LandscapeTuesday, 9 November 20041:30 PM - 5:30 PM
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CLIMATE HISTORY OF THE PAST 140,000 YEARS IN THE NORTHERN ROCKY MOUNTAINS BASED ON LOESS DEPOSITION AND SOIL DEVELOPMENT IN SOUTHERN JACKSON HOLE, WYOMING
102 Quaternary Geology IIMonday, 8 November 20041:30 PM - 5:30 PM
Date Unknown
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BLACK MESA REVISITED: NEW OSL DATES PROVIDE EVIDENCE OF LATE FULL-GLACIAL AND EARLY HOLOCENE EOLIAN ACTIVITY ON BLACK MESA, NORTHEASTERN AZ
27 Quaternary Geology/Geomorphology (Posters)