Shannon Mahan

Biography

I graduated from Adams State University (Colorado) with a B.S. in Geology in 1987.  I immediately began work at the USGS with the Isotope Branch of Geology/Yucca Mountain Project as a Physical Science Technician. In 1991 I was converted to Geologist, in 1994 to Hydrologist, in 1999 back to Geologist, and in 2006 to Research Geologist.  From 1987 to 2017 I have worked with Radiogenic Isotopes, Thermoluminescence (TL), Optically Stimulated Luminescence (OSL), Radiation Dosimetry, and maintaining a sense of humor.  I have been the USGS Luminescence Geochronology Lab Director since 1997 and routinely work on 20 to 30 projects during the year throughout the USGS mission areas.

Over the past 35 years, luminescence dating has become a key tool for dating sediments of interest in paleoseismic research. The data obtained from luminescence dating has been used to determine timing of fault displacement, calculate slip rates, and estimate earthquake recurrence intervals. Luminescence is also used to date paleontology sites, fluvial terraces (including paleoflood deposits), eolian deposits, and is increasingly used to calibrate wildfire temperatures and thermochronology. The flexibility of luminescence is a key complement to other chronometers such as radiocarbon or cosmogenic nuclides. Careful sampling and correct selection of sample sites exert two of the strongest controls on obtaining an accurate luminescence age. Factors such as partial bleaching and post-depositional mixing should be avoided during sampling and special measures may be needed to help correct for associated problems. Like all geochronologic techniques, context is necessary for interpreting and calculating luminescence results and this can be achieved by supplying participating labs with associated trench logs, photos, and stratigraphic locations of sample sites. (Taken from Gray et al, 2015 paper GUIDE TO LUMINESCENCE DATING TECHNIQUES AND THEIR APPLICATION FOR PALEOSEISMIC RESEARCH).

I provide age constraints on Quaternary deposition for a variety of eolian, fluvial, alluvial and lacustrine systems by dating sediment grains of alkali potassium feldspar (preferably orthoclase, microcline, and sanidine) using infrared stimulated luminescence (IRSL) or quartz using blue light stimulated luminescence (OSL).  As the only USGS luminescence dating specialist, I am an integral part of multi-disciplinary, multi-agency, and multi-institutional projects that provide chronologic control for Quaternary field studies in the continental United States.  I have supervised the growth and development of the USGS Luminescence Geochronology Lab (established in 1990) by mentoring many students, expanding corroborative and collaborative projects with private companies and universities, instituting new work with state geological surveys via STATEMAP or EDMAP, organizing workshops for both USGS and non-USGS personnel, and hosting distinguished foreign scientists.

As well as doing routine dating for a variety of USGS projects, I have provided luminescence expertise for many larger USGS efforts with a dramatic increase in real-time data availability and publication of results (i.e. new technology with a portable OSL reader). I have provided detailed analyses, evaluations, and/or reviews of OSL data to such entities as the National Science Foundation (NSF), The Army Research Office, the Army Corps of Engineers, The Bureau of Reclamation, The National Park Service, and many state geological surveys and departments of natural resources.  I have also initiated collaborative work and grants with other luminescence dating labs in the US by providing expert review on grant proposals, second-opinion elemental dosimetry regarding possible disequilibrium, and first refusal for many novel or cutting applications as applied to luminescence dating (which helps provide outside funding).  Other scientists routinely seek my advice in luminescence dating and I receive at least ten inquiries a week related to questions of luminescence dosimetry, usually via the USGS luminescence dating website. http://gec.cr.usgs.gov/projects/lumlab/ 

Publications 2016-2008:

Sherrod, B.L., Blakely, R.J., Lasher, J.P., Lamb, A., Mahan, S.A., Foit, F.F., Barnett, E.A., 2016, Active faulting on the Wallula fault zone within the Olympic-Wallowa Lineament, Washington State, USA, GSA Bulletin, in press.

Rengers, F. K., Tucker, G. E., and Mahan, S., 2016, Episodic bedrock erosion by gully-head migration, Colorado High Plains, USA, Earth Surface Processes and Landforms 41, (11), 1574–1582. DOI: 10.1002/esp.3929

Huckleberry, G., Ferguson, T.J., Rittenour, T., Banet, C., Mahan, S.A., 2016, Identification and dating of indigenous water storage reservoirs along the Rio San José at Laguna Pueblo, western New Mexico, USA, Journal of Arid Environments 127, p. 171-186.  doi:10.1016/j.jaridenv.2015.11.0

Ritz, J. F., Avagyan, A., Mkrtchyan, M., Nazari, H., Blard, P. H., Karakhanian, A., Philip, H., Balescu, S., Mahan, S.A., Huot, S., Münch, P., Lamothe, M., 2016, Active tectonics within the NW and SE extensions of the Pampak-Sevan-Syunik fault: Implications for the present geodynamics of Armenia, Quaternary International 395, p. 61-78. http://dx.doi.org/10.1016/j.quaint.2015.05.021

Zuniga de Leon, D., Kershaw, S., Mahan, S.A., 2016, Quaternary alluvial fans of Cuidad Juarez, Chihuahua, northern Mexico: OSL ages and implications for climatic history of the area, El Boletin de la Sociedad Geologica Mexicana 68 (1), p. 111-128. http://boletinsgm.igeolcu.unam.mx/bsgm/vols/epoca04/6801/(13)Zuniga.pdf

Burton, W.C., Harrison, R.W., Spears, D.B. Evans, N. H., Mahan, S.A., 2015, Geologic framework and evidence for neotectonism in the epicentral area of the 2011 Mineral, Virginia, earthquake. Special Paper of the Geological Society of America 509, p. 345-376. doi:10.1130/2015.2509(20)  

Dragovich, J.D.; Mahan, S.A.; Anderson, M.L.; MacDonald, J.H., Jr; Schilter, J.F.; Frattali, C.L.; Koger, C.J., Smith, D.T.; Stoker, B.A.; DuFrane, A.; Eddy, M P.; Cakir, R.; Sauer, K.B., 2015, Geologic map of the Lake Roesiger 7.5-minute quadrangle, Snohomish County, Washington: Washington Division of Geology and Earth Resources Map Series 2015-01, 1 sheet, scale 1:24,000, 47 p. text.   [http://www.dnr.wa.gov/publications/ger_ms2015-01_geol_map_lake_roesiger_24k.zip]

Pazzaglia, F.J., Carter, M., Berti, C., Counts, R., .Hancock, G., Harbor, D., Harrison, R., Heller, M., Mahan, S.A., Malenda, H., McKeon, R., Nelson, M., Prince, P., Rittenour, T., Spotila, J., Whittecar, R., 2015, Geomorphology, active tectonics, and landscape evolution in the Mid-Atlantic Region, Geological Society of America Field Guide 40, p. 109-169.

Sneed, M., Orlando, P.P., Borchers, J.W., Everett, R.T, Solt, M., McGann, M., Lowers, H., Mahan, S.A., 2015, Lithostratigraphic, borehole-geophysical, hydrogeologic, and hydrochemical data from the East Bay Plain, Alameda County, California, U.S. Geological Survey Data Series 890, 56 p. http://dx.doi.org/10.3133/ds890

Cyr, A.J., Miller, D.M., Mahan, S.A., 2015, Paleodischarge of the Mojave River, southwestern United States, investigated with single-pebble measurements of 10Be, Geosphere 11 (4), p. 1158-1171. http://dx.doi.org/10.1130/GES01134.1

DeJong, B.D., Bierman, P., Newell, W.L., Rittenour, T.M., Mahan, S.A., Balco, G., Hood, D.R., 2015, Pleistocene relative sea levels in the Chesapeake Bay region and their implications for the next century, GSA Today 25 (8), p. 4-10.  http://www.geosociety.org/gsatoday/archive/25/8/article/i1052-5173-25-8-4.htm

Kendrick, K.J., Matti, J.C., Mahan, S.A., 2015, Late Quaternary slip history of the Mill Creek strand of the San Andreas Fault in San Gorgonio Pass, southern California: The role of a subsidiary left-lateral fault in strand switching, GSA Bulletin 127 (5-6), p. 825-849.  http://dx.doi.org/10.1130/B31101.1

Nelson, M., Gray, H., Johnson, J.A., Rittenour, T.M., Feathers, J., Mahan, S.A., 2015, User guide for luminescence sampling in archaeological and geological contexts, Advances in Archaeological Practice 3 (2), p. 166-177. http://dx.doi.org/10.7183/2326-3768.3.2.166

Mahan, S.A., Nelson, M., Rittenour, T. M., Hanson, P. R., and Rhodes, E.G.., 2015, The 9th New World Luminescence Dating Workshop: aim of the community and scope of the conference proceedings, USA, Quaternary International 362, 1-2. [Link]

Mahan, S. A., Donlan, R.A. and Kardos, B., 2015, Luminescence dating of anthropogenic features of the San Luis Valley, Colorado: from stone huts to stone walls, Quaternary International 362, 50-62. [Link]

Gray, H.G. and Mahan, S.A.2015, Variables and potential models for the bleaching of luminescence signals in fluvial environments, Quaternary International 362, 42-49. [Link]

Ellwein, A. L., Mahan, S.A. and MacFadden, L.D., 2015, Black Mesa revisited: Climate change impacts on sand supply and availability as well as the formation and stability of late Quaternary sand sheets and Falling Dunes, southern Colorado Plateau, USA, Quaternary International 362, 87-107. [Link]

Counts, R. C., Murari, M., Owen, L. A., Mahan, S., Greenan, M., 2015, Landscape development, paleoenvironmental change, and a ~130 ka chronostratigraphic framework from terraces and alluvium of the lower Ohio River, southwestern Indiana and western Kentucky, USA. Quaternary Science Reviews 110, 72-91. [Link]

Rizza, M., Ritz, J-F., Prentice, C., Vassallo, R., Baruacher R., Larroque, C., Arzhannikova, A., Arzhannikova, S., Mahan, S., Massault, M., Michelot, J-L., Todbileg, M., ASTER Team, 2015, Earthquake Geology of the Bulnay Fault (Mongolia), Bulletin of Seismological Society of America 105 (1), 72-93. [Link]

Gray, H.J.Mahan, S.A., Rittenour, T., and Nelson, M., 2015, Guide to luminescence dating techniques and their applications for paleoseismic research, proceeding in Lund, W.R., editor, 2015, Proceedings volume, Basin and Range Province Seismic Hazards Summit III (BRPSHSIII): Utah Geological Survey Miscellaneous Publication 15-xx, variously paginated, http://ugspub.nr.utah.gov/publications/misc_pubs/mp-15-5/mp-15-5_invited_paper.pdf.

Garcia, A.F. and Mahan, Shannon A., 2014, The notion of climate-driven strath-terrace genesis assessed via dissimilar stream-process response to late Quaternary climate, Geomorphology 214, 223-244. [Link]

Peek, K.M., Mallinson, D.J., Culver, S.J., and Mahan, S.A., 2014. Holocene geologic development of the Cape Hatteras region, Outer Banks, North Carolina, USA, Journal of Coastal Research 30 (1), 41-58. [Link]

Garcia, Anna L, Knott, Jeff R., Mahan, Shannon A., Bright, Jordan, 2014, Geochronology and paleoenvironment of pluvial Harper Lake, Mojave Desert, California, USA, Quaternary Research 81, 305-317. [Link]

Mahan, Shannon A., Gray, Harrison J., Pigati, Jeffrey S., Wilson, Jim, Lifton, Nathaniel A., Paces, James B., and Blaauw, Maarten, 2014, A geochronologic framework for the Ziegler Reservoir fossil site, Snowmass Village, Colorado, Quaternary Research 82 (3), 490-503. (includes extensive supplemental info). [Link]

Gold, R., Briggs, R., Personius, S., Crone, A.J., Mahan, S., Angster, S., 2014, Distributed dextral shear near the Mohawk Valley fault zone, northern Walker Lane, California, Journal of Geophysical Research-Solid Earth 119 (6), 5014-5032. [Link]

Gray, Harrison, Own, Lewis A., Dietsch, Craig, Beck, Richard, and Mahan, Shannon A., 2014, Quaternary landscape development, alluvial fan chronology, and erosion of Mecca Hills at the southern end of the San Andreas fault zone, Quaternary Science Reviews 105, 66-85. [Link]

Miller, I.M., Pigati, J.S., Anderson, R.S., Johnson, K.R., MahanS.A., Thomas A. Ager, Richard G. Baker, Maarten Blaauw, Jordan Bright, Peter M. Brown, Bruce Bryant, Zachary T. Calamari, Paul E. Carrara, Michael D. Cherney, John R. Demboski, Scott A. Elias, Daniel C. Fisher, Russell W. Graham, Harrison J. Gray, Danielle R. Haskett, Jeffrey S. Honke, Stephen T. Jackson, Gonzalo Jiménez-Moreno, Douglas Kline, Eric M. Leonard, Nathaniel A. Lifton, Carol Lucking, H. Gregory McDonald, Dane M. Miller, Daniel R. Muhs, Stephen E. Nash, Cody Newton, James B. Paces, Lesley Petrie, Mitchell A. Plummer, David F. Porinchu, Adam N. Rountrey, Eric Scott, Joseph J.W. Sertich, Saxon E. Sharpe, Gary L. Skipp, Laura E. Strickland, Richard K. Stucky, Robert S. Thompson, Jim Wilson, 2014, A high-elevation, multi-proxy biotic and environmental record of MIS 6–4 from the Ziegler Reservoir fossil site, Snowmass Village, Colorado, USA. Quaternary Research 82 (3), p. 618-634. [Link]

Hylland, M. D., DuRoss, C.B., McDonald, G. N., Olig, S. S., Oviatt, C. G., Mahan, S. A., Crone, A. J., and Personius, S.F., 2014, Late Quaternary paleoseismology of the West Valley fault zone-insights from the Baileys Lake trench site in DuRoss, C.B. and Hylland, M.D., Evaluating surface faulting chronologies of graben-bounding faults in Salt Lake Valley, Utah—new paleoseismic data from the Salt Lake City segment of the Wasatch fault zone and the West Valley fault zone—Paleoseismology of Utah, Volume 24, Utah Geological Survey Special Study 149, 41-76, 8 appendices, 1 plate, CD.

Sohn, Marsha, Knott, Jeffrey R., and Mahan, Shannon A.2014, Paleoseismology of the Southern Section of the Black Mountains and Southern Death Valley Fault Zones, Death Valley, United States, Environmental and Engineering Geoscience 20 (2), 177-198. [Link]

Dragovich, J. D.; Frattali, C. L.; Anderson, M. L.; Mahan, S. A.; MacDonald, Jr., J. H.; Stoker, B. A.; Smith, D. T.; Koger, C. J.; Cakir, R.; DuFrane, S. A.; Sauer, K. B., 2014, Geologic map of the Lake Chaplain 7.5-minute quadrangle, Snohomish County, Washington: Washington Division of Geology and Earth Resources Map Series 2014-01, 1 sheet, scale 1:24,000, 51 p. [Link]

Stamm, J., Hendricks, R., Sawyer, J.F., Mahan, S., Zaprowski, B., Geibel, N. and Azzolini, D., 2013, Late Quaternary stream piracy and strath terrace formation along the Belle Fourche and lower Cheyenne Rivers, South Dakota and Wyoming, Geomorphology 197, 10-20. [Link]

Swezey, C.S., Schultz, A.P., Gonzalez, W.A., Bernhardt, C.E., Doar, W.R., Garrity, C.P., Mahan, S.A., and McGeehin, J.P., 2013, Quaternary eolian dunes in the Savannah River Valley, Jasper County, South Carolina, USA, Quaternary Research 80 (2), 250-264. [Link]

Amos, Colin, Lutz, Andrew, Jayko, Angela, Mahan, Shannon, Fisher, G. B., Unruh, Jeffrey, 2013, Refining the southern extent of the 1872 Owens Valley earthquake rupture through paleoseismic investigations in the Haiwee Area, southeastern California, Bulletin of the Seismological Society of America 103 (2A), 1022-1037. [Link]

Briggs, R.W., Wesnousky, S.G., Brune, J.N., Purvance, M.D., and Mahan, S.A., 2013, Low Footwall Accelerations and Variable Surface Rupture Behavior on the Fort Sage Mountains Fault, Northeast California, Bulletin of Seismological Society 103 (1), 157-168. [Link]

Rizza, Magali, Vernant, Phillippe, Ritz, Jean-Francois, Peyret, Michel, Nazari, Hamid, Nankali, Hamid, Djamour, Yahya, Salamati Reza, Mahan, Shannon, Masson, F., 2013, Morphotectonics and geodetic evidences for a constant slip-rate over the last 45 kyr along the Tabriz Fault (Iran), Geophysical Journal International, June 2013 193 (3), 1083-1094. [Link]

Lail, Warren, Sammeth, David, Mahan, Shannon, and Nevins, Jason, 2013, A Non-Destructive Method for Dating Human Remains, Advances in Archeological Practice 1 (2), 91-103. [Link]

Madole, Richard, Mahan, Shannon A., Romig Joe H., 2013, Constraints on the age of the Great Sand Dunes, Colorado, from subsurface stratigraphy and OSL dates, Quaternary Research 80 (3), 435-446. [Link]

Markewich, H. W., Pavich, M. J., Shultz, A. P., Mahan, S.A., Aleman-Gonzalez, W. B., and Bierman, P. R., 2013, Geochronologic evidence for a possible MIS-11 emergent barrier/beach-ridge in southeastern Georgia, USA, Quaternary Science Reviews 60, 49-75. [Link]

Dragovich, J. D., H. A. Littke, S. A. Mahan, M. L. Anderson, J. H. MacDonald Jr., Recep Cakir, B. A. Stoker, C. J. Koger, J. P. Bethel, S. A. DuFrane, D. T. Smith, and N. M. Villeneuve, 2013, Geologic map of the Sultan 7.5-minute quadrangle, King and Snohomish Counties, Washington. 2013. 44 x 36 in. color plate, scale 1:24,000, with 52 p. text. [Link]

Garcia, A.F. and Mahan, S.A., 2012, The influence of upper-crust lithology on topographic development in the central Coast Ranges of California, Geomorphology 138, 243-262. [Link]

Mahan, S.A. and Kay, J., 2012, Building on previous OSL dating techniques for gypsum: A case study from Salt Basin Playa, New Mexico, Quaternary Geochronology 10, 345-352. [Link]

Lancaster, Nick and Mahan, Shannon A., 2012, Holocene Dune Formation at Ash Meadows National Wildlife Area, Nevada, Quaternary Research 78 (2), 266-274. [Link]

McDougall, Kristin, Hillhouse, John, Powell, Charles, Mahan, Shannon, Wan, Elmira, and Sarna-Wojcicki, Andrei (edited by Kristin McDougall), 2012, Paleontology and Geochronology of the Long Beach Core Sites and Monitoring Wells, Long Beach, California, USGS Open-File Report 2011-1274, 235 p., 18 plates. [Link]

Harrison, R.W., Tsiolakis, E., Stone, B., Lord, A., McGeehin, J.P., Mahan, S. A., and Chirico, P., 2012, Late Pleistocene and Holocene Uplift History of Cyprus: Implications for Active Tectonics along the Southern Margin of the Anatolian Microplate [Appearing in: Geological Development of the Anatolian Continent and the easternmost Mediterranean Region, Paper #Anat-115] Geological Society, London, Special Publications 372, also Geological Society Supplementary Publication No. SUP18533. [Link]

Hylland, Mike D., DuRoss, Christopher B., McDonald, Greg N., Olig, Susan S., Mahan, Shannon A., Oviatt, Charles, G., Basin-Floor Lake Bonneville stratigraphic section as revealed in paleoseismic trenches on the West Valley Fault Zone, Salt Lake Valley, Utah, 2012, Utah Geological Association Guidebook, "Selected Topics in Engineering and Environmental Geology of Utah", ed. By Kimm Harty and Mike Hylland, Utah Geological Association Publication 41 (CD), 335 pages.

Washington State Department of Natural Resources Open File Report 2012-1. Dragovich, J. D.; Anderson, M. L.; Mahan, S. A.; MacDonald, J. H., Jr.; McCabe, C. P.; Cakir, Recep; Stoker, B. A.; Villeneuve, N. M.; Smith, D. T.; Bethel, J. P., 2012, Geologic map of the Lake Joy 7.5-minute quadrangle, King County, Washington: Washington Division of Geology and Earth Resources Map Series 2012-01, 2 sheets, scale 1:24,000, 79 p. text. [Link]

Washington State Department of Natural Resources 2011-1. Geologic map of the Monroe 7.5-minute quadrangle, King and Snohomish Counties, Washington, 2011, J. D. Dragovich, M. L. Anderson,S. A. Mahan, C. J. Koger, J. H. Saltonstall, J. H. MacDonald Jr., G. R. Wessel, B. A. Stoker, J. P. Bethel, J. E. Labadie, Recep Cakir, J. D. Bowman, and S. A. DuFrane, 42 x 36 in. color sheet, scale 1:24,000, with 24 p. text. [Link]

Ellwein, A.L., Mahan, S.A., McFadden, L.D., 2011, New Optically Stimulated Luminescence ages provide evidence of MIS3 and MIS2 eolian activity on Black Mesa, Northern Arizona, USA, Quaternary Research, 75 (3), 395-398. [Link]

Mallinson, D.J., Smith, C.W., Mahan, S., Culver, S.J., McDowell, K., 2011, Barrier island response to late Holocene climate events, North Carolina, USA, Quaternary Research 76 (1), 46-57. [Link]

Pigati, Jeffrey, S., Miller, David, M., Bright, Jordan, E., Mahan, Shannon, A., Nekola, Jeffrey, C., and Paces, James, B., 2011, Chronology, sedimentology, and microfauna of ground-water discharge deposits in the central Mojave Desert, Valley Wells, California, The Geological Society of America Bulletin 123 (11-12), 2224-2239. [Link]

Rizza, M. Mahan, S., Ritz, J-F., Nazari, H., Hollingsworth, J., and Salamanti, R., 2011, Using luminescence dating of coarse matrix material to estimate the slip-rate of the Astenah fault, Iran, Quaternary Geochronology 6 (3-4), 390-406.

Pierce, K.L., Muhs, D.R., Fosberg, M.A, Mahan, S.A. Rosenbaum, J. G., Liccardi, J. M., and Pavich, M., 2011, A loess-paleosol record of climate and glacial hisotry over the past two glacial-interglacial cycles (~150 ka), southern Jackson Hole, Wyoming. Quaternary Research 76 (1), 119-141. [Link]

Washington State Department of Natural Resources Open File Report 2011-2. Analytical data from the Monroe 7.5-minute quadrangle, King and Snohomish Counties, Washington—Supplement to Open File Report 2011-1, by J. D. Dragovich, S. A. Mahan, M. L. Anderson, J. H. MacDonald Jr., G. R. Wessel, S. A. DuFrane, Recep Cakir, J. D. Bowman, and H. A. Littke. 61 p., 2 plates, and 2 Microsoft Excel files. [Link]

Open File Report 2010-5. Supplement to geologic maps of the Lilliwaup, Skokomish Valley, and Union 7.5-minute quadrangles, Mason County, Washington-Geologic setting and development around the Great Bend of Hood Canal, by Michael Polenz, T. A. Contreras, J. L. Czajkowski, Gabriel Legorreta Paulin, B. A. Miller, M. E. Martin, T. J. Walsh, R. L. Logan, R. J. Carson, C. N. Johnson, R. H. Skov, S. A. Mahan, and C. R. Cohan. 2010. 27 p. [Link]

Open File Report 2010-4. Geologic map of the Lilliwaup 7.5-minute quadrangle, Mason County, Washington, by T. A. Contreras, Gabriel Legorreta Paulin, J. L. Czajkowski, Michael Polenz, R. L. Logan, R. J. Carson, S. A. Mahan, T. J. Walsh, C. N. Johnson, and R. H. Skov. 2010. 27.5 x 36 in. color sheet, scale 1:24,000, with 13 p. text. [Link]

Open File Report 2010-3. Geologic map of the Skokomish Valley and Union 7.5-minute quadrangles, Mason County, Washington, by Michael Polenz, J. L. Czajkowski, Gabriel Legorreta Paulin, T. A. Contreras, B. A. Miller, M. E. Martin, T. J. Walsh, R. L. Logan, R. J. Carson, C. N. Johnson, R.H. Skov, S. A. Mahan, and C. R. Cohan. 2010. 42 x 36 in. color sheet, scale 1:24,000, with 21 p. text. [Link]

Open File Report 2010-2. Supplement to the geologic map of the Carnation 7.5-minute quadrangle, King County, Washington-Geochronologic, geochemical, point count, geophysical, earthquake, fault, and neotectonic data, by J. D. Dragovich, M. L. Anderson, J. H. MacDonald Jr., S. A. Mahan, S. A. DuFrane, H. A. Littke, G. R. Wessel, J. H. Saltonstall, C. J. Koger, and Recep Cakir. 2010. 42 p. with 8 digital appendices. [Link]

Open File Report 2010-1. Geologic map of the Carnation 7.5-minute quadrangle, King County, Washington, by J. D. Dragovich, H. A. Littke, M. L. Anderson, G. R. Wessel, C. J. Koger, J. H. Saltonstall, J. H. MacDonald Jr., S. A. Mahan, and S. A. DuFrane. 2010. 42 x 36 in. color sheet, scale 1:24,000, with 21 p. text. [Link]

Miller, David M., Schmidt, Kevin M., Mahan, Shannon A., McGeehin, Jack P., Owen, Lewis A., Barron, John A., Lehmkuhl, F., Löhrer, R., 2010, Holocene landscape response to seasonality of storms in the Mojave Desert: Quaternary International 215 (1-2), 45-61.

Halfen, A.F., Fredlund, G.G., and Mahan, S.A., 2010, Holocene Stratigraphy and chronology of the Casper dune field, Casper, Wyoming, USA, Holocene 20 (5), 773-783.

Holen, Steve, May, David, and Mahan, Shannon, 2010, The Angus Mammoth: a decades old controversy resolved, American Antiquity, 56-62.

Personius, S.F., Crone, A.J., Machette, M.N., Mahan, S.A., and Lidke, D.J., 2009, Moderate ranges of late Quaternary slip along the northwestern margin of the basin and range Province, Surprise Valley fault, northeastern California, Journal of Geophysical Research B: Solid Earth 114 (9), Art. No. B09405.

Mahan, S., Noe, David, C. and McCalpin, J.P., 2009, Use of OSL dating to establish the stratigraphic framework of Quaternary eolian sediments, Anton scarp upper trench, Northeastern Colorado High Plains, USA: Quaternary International 199, 92-103.

Pigati, J.S., Bright, J.E., Shanahan, T.M., and Mahan, S.A., 2009, Late Pleistocene paleohydrology near the boundary of the Sonoran and Chihuahuan Deserts, southeastern Arizona, USA: Quaternary Science Reviews 28, 286-300.

Garcia, A. F. and Mahan, S.A.2009, Sediment storage and transport in Pancho Rico Valley during and after the Pleistocene-Holocene transition, Coast Ranges of central California (Monterey County): Earth Surface Processes and Landforms 34, 1136-1150.

Mallinson, D., Mahan, S., Moore, C., 2008, High resolution shallow geologic characterization of a late Pleistocene eolian environment using ground penetrating radar and optically stimulated luminescence techniques: North Carolina, USA, Southeastern Geology 45 (3), 161-177.

Burkhart, P.A., Livingston, J., Rawling, E. J., Hanson, P.R., Mahan, S., Benton, R., Heffron, E., Jahn, M., Anderson, T. and Page, B, 2008, Late Pleistocene through Holocene landscape evolution of the White River Badlands, South Dakota, GSA Field Guide 10: Roaming the Rocky Mountains and Environs: Geological Field Trips: Geological Society of America, p. 235-248.

Lundstrom, S., Mahan, S., Paces, J., Hudson, M., House, K., Malmon, D., Blair, J.L., and Howard, K., 2008, Late Pleistocene aggradation and degradation of the lower Colorado River: perspectives from the Cottonwood area and other reconnaissance below Boulder Canyon: Geological Society of America Special Bulletin 439, 411-432.

Personius, S.F., Crone, A.J., Machette, M.N., Lidke, D.J., Bradley, L., and Mahan, S.A.2008, Logs and Scarp Data from a paleoseismic investigation of the Surprise Valley fault Zone, Modoc County, California: U.S. Geological Survey Scientific Investigations Map 2983. [Link]

Mallinson, Dave, Burdette, Kevin, Mahan, Shannon, and Brook, George, 2008, Optically stimulated luminescence age controls on late Pleistocene and Holocene coastal lithosomes, North Carolina, USA: Quaternary Research 69 (1), 97-109.

 PREVIOUS PUBLICATIONS 1990-2007

1).  Marshall B.D., Peterman Z.E., Futa K., Stuckless J.S., Mahan, S.A., Downey J.S., and Gutentag E.D., 1990, Origin of carbonate deposits in the vicinity of Yucca Mountain, Nevada: Preliminary results of strontium-isotope analyses: High Level Radioactive Waste Management Proceedings, vol.2, p. 921-923.

2).  Peterman Z.E., Spengler R.W., Futa K., Marshall B.D., and Mahan, S.A., 1991, Assessing the natural performance of felsic tuffs using the Rb-Sr and Sm-Nd systems study of the altered zone in the Topopah Spring Member, Paintbrush Tuff, Yucca Mountain, Nevada: Materials Research Society Symposium Proceedings, vol. 212, p. 687-694.

3).  Sims P. K., Peterman Z.E., Hildenbrand, T.G., and Mahan, S.A., 1991, Precambrian Basement map of the Trans-Hudson Orogen and Adjacent Terranes, northern Great Plains, USA: U.S. Geological Survey Miscellaneous Investigations Series, Map I-2214.

4).  Marshall B.D., Whelan J. F., Peterman Z. E., Futa K., and Mahan, S.A. and Stuckless, J.S., 1992, Isotopic studies of fracture coatings at Yucca Mountain, Nevada, USA IN Kharaka, Y.K. and Maest, S. ed., Water-Rock Interactions: A.A. Balkema, Rotterdam, vol. 1, p. 737-740.

5).  Peterman Z.E., Stuckless J. S., Mahan, S., Marshall B.D., Gutentag E. D., and Downey J. S., 1992, Strontium isotope characterization of the Ash Meadows ground-water flow system, southern Nevada, USA IN Kharaka, Y.K. and Maest, S. ed., Water-Rock Interactions: A.A. Balkema, Rotterdam,  vol. 1, p. 825-829.

6).  Peterman Z.E., Stuckless J. S., Marshall, B.D., Mahan, S.A. and Futa K., 1992, Strontium isotope geochemistry of calcite fracture fillings in deep core, Yucca Mountain, Nevada--A Progress report: International High-Level Radioactive Waste Management 3: American Nuclear Society, vol. 2, p. 1582-1586.

7).  Peterman Z.E., Widmann B.L., Marshall, B.D., Aleinikoff J.L., Futa K., and Mahan, S.A., 1994, Isotopic tracers of Gold Deposition in Paleozoic Limestones, southern Nevada, International High-Level Radioactive Waste Management 5: American Nuclear Society, vol. 3, p. 1316-1323.

8).  Marshall B.D. and Mahan, S.A., 1994, Strontium Isotope Geochemistry of Soil and Playa Deposits near Yucca Mountain, Nevada, International High-Level Radioactive Waste Management 5: American Nuclear Society, vol. 4, p. 2685-2691.

9).  Lundstrom S.C., Whitney J.W., Paces J.B., Mahan, S.A. and Ludwig, K.R, 1995, Preliminary surficial deposits map of the southern half of the Busted Butte 7.5 quadrangle, Nye County, Nevada: U.S. Geological Survey Open-File Report 95-311, 2 sheets.

10).  Lundstrom S.C., Mahan, S.A. and Paces, J.B., 1995, Preliminary surficial deposits map of the northwest quarter of the Busted Butte 7.5 quadrangle, Nye County, Nevada: U.S. Geological Survey Open-File Report 95-133, 2 sheets.

11).  Muhs D.R., Bush C.A., Cowherd S. D., and Mahan, S.A., 1995, Geomorphic and geochemical evidence for the source of sand in the Algodones dunes, Colorado desert, southeastern California in Vatche P. Tchakerian, Desert Aeolian Processes, Chapter 3: Chapman and Hall, London, p.37-74.

12).  Paces J.B, Mahan, S.A., Kwak, L., Neymark, L.A., McConnaughey, E.A, and Bush, C.A., 1995, Preliminary Age Estimates for Late Pleistocene Ground-water Discharge Deposits near Yucca Mountain, Nevada: U.S. Geological Survey Open-File Report 94-703, 89 p.

13).  Paces J.B, Mahan, S.A., Ludwig, K.R., Kwak, L., Neymark, L.A., Simmons, K.R., Nealy, L.D., Marshall, B.D. and Walker, A., 1995, Progress Report on Dating Quaternary Surficial Deposits: 1995 Milestone report 3GCH510M.

14).  Singer, F.T., Dickerson, R.P., Olsten, M.J., and Mahan, S.A., 1995, Geochemistry of borehole samples from USW G-1 and USW G-3/GU-3, Yucca Mountain, Nevada: U.S. Geological Survey Open-File Report 95-54, 133 p.

15).  Herwitz, S.R., Muhs, D.R., Prospero, J. M., Mahan, S.A. and Vaughn, B., 1996, Origin of Bermuda’s clay-rich Quaternary Paleosols and their Paleoclimatic Significance: Journal of Geophysical Research, vol. 101, no. D18, p. 23,389-23,400.

16).  Menges, C. M., Oswald, J.A., Coe, J. A., Lundstrom, S. C., Paces, J. B., Mahan, S. A. and Widmann, B., 1996, Paleoseismic Investigations of Stagecoach Road fault, Southeastern Yucca Mountain, Nye County, Nevada: U.S. Geological Survey Open-File Report 96-417, 212p.

17).  Muhs D.R., Stafford, T.W., Cowherd S.D., Mahan, S.A, Kihl, R., Maat P.B., Bush C.A., Dunkin, J., and Nehring, Jennifer, 1996, Origin of the Late Quaternary dune fields of Northeastern Colorado: Geomorphology, vol. 17, p. 129-149.

18).  Crone, Anthony J., Machette, Michael, N. Bradley, Lee-Ann and Mahan, Shannon A., 1997, Late Quaternary Surface Faulting on the Cheraw Fault, Southeastern Colorado: U.S. Geological Survey Investigations Map and Pamphlet I-2591.

19).  Menges, C.M., Taylor, E.M., Vadurro, G., Oswald, J.A., Cress, R., Murray, M., Lundstrom, S.C., Paces, J.B. and Mahan, S.A., 1997, Logs and Paleoseismic Interpretations from Trenches 14C and 14D on the Bow Ridge Fault, Northeastern Yucca Mountain, Nye County, Nevada: U.S. Geological Survey Miscellaneous Field Studies Map MF-2311, 4 plates.

20).  Muhs D.R., Stafford, T.W., Been, J., Mahan, S.A., Burdett J., Skipp, G. and Rowland, Z.M., 1997, Late Holocene eolian sand deposition in the Minot Dune Field, North Dakota: Canadian Journal of Earth Sciences, vol. 34, no. 11, p. 1442-1459.

21).  Muhs, D.R., Stafford, T.W., Swinehart, J.B., Mahan, S.A., Cowherd, S.D., Bush, C.A., Madole, R.F. and Maat, P.B., 1997, Late Holocene Eolian activity in the mineralogically mature Nebraska Sand Hills: Quaternary Research, vol. 48, p. 162-176. 

22).  Paces, J.B., Whelan, J.F., Forester, R.M., Bradbury, J.P., Marshall, B.D. and Mahan, S.A., 1997, Summary of Discharge Deposits in the Amargosa Valley: U.S. Geological Survey Administrative Milestone Report SPC333M4 to DOE. 

23).  Lundstrom, S.C., Page, W.R., Langenheim, V.E., Young, O.D., Mahan, S.A. and Dixon, G.L., 1998, Preliminary Geologic Map of the Valley Quadrangle, Clark County, Nevada: U.S. Geological Survey Open-File Report 98-508, 2 sheets.

24).  Lundstrom, S.C., Paces, J.B. and Mahan, S.A., 1998, Late Quaternary History of Fortymile Wash in the area near the H-Road Crossing, Field Trip Guide for Quaternary Geology of the Yucca Mountain Area, Southern Nevada: 1998 annual meeting of the Friends of the Pleistocene, Pacific Cell, Oct. 9-11, 1998, p. 63-67.

25).  Menges, C.M., Oswald, J.A., Coe, J.A., Lundstrom, S.C., Paces, J.B., Mahan, Shannon A., Widmann, B. and Murray, M., 1998, Paleoseismic Investigations of Stagecoach Road Fault, Southeastern Yucca Mountain, Nye County, Nevada: U.S. Geological Survey Open-File Report 96-417, 3 plates.

26).  Forester, R.M., Bradbury, J.P., Carter, C., Elvidge-Tuma, A.B., Hemphill, M.L., Lundstrom, S.C., Mahan, Shannon A., Marshall, B.D., Neymark, L.A., Paces, J.B., Sharpe, S.E., Whelan, J. F and Wigand, P.E., 1998, The Climatic and Hydrologic History of Southern Nevada During the Late Quaternary: U.S. Geological Survey Open-File Report 98-635, 57 p.

27).  Lundstrom, S.C., Paces, J.B., Mahan, S. A., Page, W. R. and Workman, J.B., 1999, Quaternary Geologic mapping and geochronology of the Las Vegas 1:100,000 sheet and Yucca Mountain area-Geomorphic and Hydrologic response to climate change near Death Valley: U.S. Geological Survey Open-File Report 99-153, p. 110-111.

28).  Muhs, Dan R., Aleinikoff, J. N., Stafford, T. W., Kihl, R., Been, J., Mahan, S. A., and Cowherd, S., 1999, Late Quaternary loess in northeastern Colorado: Part 1-Age and Paleoclimatic Significance: GSA Bulletin, December 1999, vol. 111, no. 12, p. 1861-1875.

29).  Muhs, D. R., Swinehart, J. B., Loope, D. B., Been, J., Mahan, S. A., and Bush, C. A., 2000, Geochemical Evidence for an Eolian Sand Dam across the North and South Platte Rivers in Nebraska: Quaternary Research, vol. 53, p. 214-222.

30).  Personius, Stephen F., Eppes, M., and Mahan, S., Love, D. W., Mitchell, D.M. and Murphy, A., 2000, Log and Data from a trench across the Hubbell Spring Fault Zone, Bernalillo County, New Mexico: U.S. Geological Survey Miscellaneous Field Studies Map MF-2348, 3 plates.

31).  Personius, Stephen F. and Mahan, Shannon A., 2000, Paleoearthquake Recurrence on the East Paradise Fault Zone, Metropolitan Albuquerque, New Mexico: Bulletin of the Seismological Society of America, vol. 90, no. 2, p. 357-369.

32).  Personius, Stephen F. and Mahan, Shannon A., 2003, Paleoearthquakes and Eolian-Dominated Fault Sedimentation along the Hubbell Springs Fault Zone near Albuquerque, New Mexico: Bulletin of the Seismological Society of America, vol. 93, no. 3, p. 1355-1369.

33).  Rawling, J. Elmo, Fredlund, Glen. G., and Mahan, Shannon A., 2003, Aeolian cliff-top deposits and buried soils in the White River Badlands, South Dakota, USA: The Holocene, vol. 1, no. 13, p. 121-129.

34).  Lundstrom, Scott C., Mahan, Shannon A., Blakely, Richard J., Paces, James B., Young, Owen, D., Workman, Jeremiah B. and Dixon, Gary L., 2003, Geologic Map of the Mound Spring Quadrangle, Nye and Clark Counties, Nevada, and Inyo County, California: U.S. Geological Survey Miscellaneous Field Studies Map MF-2339, 1 sheet.

35).  Harrison, R.W., Newell, W.L., Bathani, H., Panayides, I., McGeehin, J.P., Mahan, Shannon A., Ozhur, A., Tsiolakis, E., and Necdet, M., 2004, Tectonic framework and Late Cenozoic tectonic history of the northern part of Cyprus: Implications for earthquake hazards and regional tectonics: Journal of Asian Earth Sciences, vol. 23 (2), p. 191-210.

36).  Wearyi, David, J., Harrison, Richard W., Wright, Maria, P., Jacobson, Robert B., Pavich, Milan J., Mahan, Shannon A. and Wronkiewicz, David J., 2004, Constraints on the geologic history of the Karst System in southern Missouri, U.S.A. provided by radiogenic, cosmogenic and physical/chemical characteristics of Doline Fill: Acta Carsologica, vol. 33 no. 2, p. 207-217.

37).  Mayer, James H. and Mahan, Shannon A., 2004, Late Quaternary stratigraphy and geochronology of the western Killpecker Dunes, Wyoming, USA: Quaternary Research, vol. 61, p. 72-84.

38).  Mayer, James H. and Mahan, Shannon A., 2004, Reply to the letter to the editor from Huntley, D.J.: Quaternary Research, vol. 21, p. 111-112.

39).  Bavec, Milos, Tulaczyk, Slawek, Mahan, Shannon A. and Stock, Greg, 2004, Late Quaternary glaciation of the Upper Soca River Region, (Southern Julian Alps, NW Slovenia): Sedimentary Geology, vol. 165, p. 265-283.

40).  Personuis, Stephen F., Anderson, Richard E., Okumura, Koji, Mahan, Shannon A. and Hancock, David A., 2004, Logs and data from an investigation of the Orovada trench site, Santa Rosa range fault zone, Humboldt County, Nevada: U.S. Geological Survey Scientific Investigations Map 2815. http://pubs.usgs.gov/sim/2005/2815.

41).  Page, William R., Lundstrom, Scott C., Harris, Anita G, Langeheim, Victoria E., Workman, Jeremiah, B., Mahan, Shannon A., Paces, James B., Dixon, Gary, L., Rowley, Peter D., Burchfiel, B.C., Bell, John W. and Smith, Eugene, I., 2005, Geologic and Geophysical Maps of the Las Vegas 30 x 60 Quadrangle, Clark and Nye Counties, Nevada, and Inyo County, California: U.S. Geological Survey Scientific Investigations Map 2845. http://pubs.usgs.gov/sim/2005/2814.

42).  Machette, Michael N., Haller, Kathleen M., Ruleman, Cal A., Mahan, Shannon A., and Okumura, Koji, 2005, Geologic evidence for late Quaternary movement on the Clan Alpine Fault, west-central Nevada-trench logs, scarp profiles, location maps, and sample and soil descriptions: U.S. Geological Survey Scientific Investigations Map 2891http://pubs.usgs.gov/sim/2005/2891/

43).  Crone, Anthony J., Kyung, Jai-Bok, Machette, Michael N., Lidke, David J., Okumura, Koji and Mahan, Shannon A., 2005, Data related to late Quaternary surface faulting on the Eastgate Fault, Churchill County, Nevada: U.S. Geological Survey Scientific Investigations Map 2893. http://pubs.usgs.gov/sim/2005/2893/

44).  Personius, Stephen F. and Mahan, Shannon A., 2005, Unusually low rates of slip on the Santa Rosa Range Fault Zone, Northern Nevada: Bulletin of the Seismological Society of America, vol. 95, no. 1, p. 319-333.

45).  Oviatt, Charles G., Miller, David M., McGeehin, John P., Zachary, Cecile and Mahan, Shannon A., 2005, The Younger Dryas phase of the Great Salt Lake, Utah, USA: Palaeogeography, Palaeoclimatology, Palaeoecology, vol. 219, p. 263-284

Crone, Anthony J.; Machette, Michael N.; Bradley, Lee-Ann; Mahan, Shannon A., 2006. Data Related to Late Quaternary Surface Faulting on the Sangre de Cristo Fault, Rito Seco Site, Costilla County, Colorado. Scientific Investigations Map 2955, map, 74 x 38 inches. [Link]

Personius, Stephen F.; Crone, Anthony J.; Machette, Michael N.; Kyung, Jai Bok; Cisneros, Hector; Lidke, David J.; Mahan, Shannon A., 2006. Trench Logs and Scarp Data from an Investigation of the Steens Fault Zone, Bog Hot Valley and Pueblo Valley, Humboldt County, Nevada. Scientific Investigations Map 2952, map, 82 x 36 inches. [Link]

Machette, Michael N.; Crone, Anthony J; Personius, Stephen F.; Mahan, Shannon A.; Dart, Richard L.; Lidke, David J.; Olig, Susan S., 2007. Paleoseismology of the Nephi Segment of the Wasatch Fault Zone, Juab County, Utah - Preliminary Results From Two Large Exploratory Trenches at Willow Creek. Geological Survey (U.S.) Scientific Investigations Map 2966, 2 Sheets: Sheet 1 - 30 x 30 inches, Sheet 2 - 52 x 31 inches. [Link]

Personius, Stephen F.; Crone, Anthony J.; Machette, Michael N.; Lidke, David J.; Bradley, Lee-Ann; Mahan, Shannon A.2007. Logs and Scarp Data from a Paloseismic Investigation of the Surprise Valley Fault Zone, Modoc County, California. Geological Survey (U.S.) Scientific Investigations Map 2983, 2 Map Sheets - Sheet 1: 64 x 36 inches, Sheet 2: 68 x 36 inches. [Link]

Ponti, Daniel J.; Ehman, Kenneth D.; Edwards, Brian D.; Tinsley, John C., III; Hildenbrand, Thomas; Hillhouse, John W.; Hanson, Randall T.; McDougall, Kristen; Powell, Charles L., II; Wan, Elmira; Land, Michael; Mahan, Shannon; Sarna-Wojcicki, Andrei M., 2007. A 3-Dimensional Model of Water-Bearing Sequences in the Dominguez Gap Region, Long Beach, California. Open-File Report 2007-1013, iv, 34 p. [Link]

Cole, J.C., Mahan, S., Stone, B.D., Shroba, R.R., 2007, Ages of Quaternary Rio Grande terrace-fill deposits, Albuquerque area, New Mexico: New Mexico Geology 20 (4), 122-132.

Owen, L.A., Bright, J., Finkel, R.C., Jaiswal, M.K., Kaufman, D.S., Mahan, S., Radtke, U., Schneider, J.S., Singhvi, A.S., Sharp, W., and Warren, C.N., 2007, Numerical Dating of a Late Quaternary spit-shoreline complex at the northern end of Silver Lake Playa, Mojave Desert, California: A comparison of the applicability of radiocarbon, luminescence, terrestrial cosmogenic nuclide, electron spin resonance, U-series and amino acid racemization methods: Quaternary International 166 (1), 87-110.

Sohn, M., Mahan, S.A., Knott, J.K., and Bowman, D.D., 2007, Luminescence ages for alluvial-fan deposits in southern Death Valley: Implications for climate-driven sedimentation along a tectonically active mountain front.: Quaternary International 166 (1), 49-60.

Mahan, S.A., Miller, D.M., Menges, C.M., and Yount, J.C., 2007, Late Quaternary stratigraphy and luminescence geochronology of the northeastern Mojave Desert: Quaternary International 166 (1), 61-78.

Mahan, S.A. and Brown, D.J., 2007, An optical age chronology of Late Quaternary extreme fluvial events recorded in Ugandan dambo soils: Quaternary Geochronology 2 (1-4), 174-180

Navarro-Gonzalez, R., Mahan, S., Singhvi, A.K., Navarro-Aveces, R., Rajot, J.L., McKay, C., Coll, P. and Raulin, F., 2007, Paleoecology reconstruction from trapped gases in a fulgurite from the Late Pleistocene of the Libyan Desert: Geology 35 (2), 171-174.