Qe Qe Qe Qe Qe Qe Qe Qe Qe Qe Qe Qe Qe Qe Qe Qe Qe Qe Qe Qe Qe Qe Qe Qfi Qfi Qfi Qfi Qfi Qfi Qfi Qflp Qflp Qflp Qflp Qflp Qflp Qflp Qflp Qflp Qflp Qflp Qflp Qflp Qflp Qflp Qflp Qfo Qfo Qfo Qfo Qfo Qfo Qfo Qfo Qfy Qfy Qfy Qfy Qfy Qfy Qfy Qfy Qfy Qfy Qfy Qfy Qfy Qfy Qfy Qfy Qfy Qfy Qfy Qfy Qfy Qfy Qfy Qfy Qfy Qfy Qfy Qfy Qfy Qfy Qfy Qfy Qfy Qfy Qfy Qfy Qfy Qfy Qfy Qfy Qfy Qfy Qfy Qfy Qfy Qfy Qfy Qfy Qfy Qfy Qfy Qfy Qfy Qfy Qfy Qfy Qfy Qfy Qfy Qfy Qfy Qfy Qfy Qfy Qfy Qfy Qfy Qfy Qfy Qfy Qfy Qfy Qfy Qfy Qfy Qfy Qlgh Qlgh Qlgh Qlgh Qlgh Qlgh Qlgh Qlgh Qlgh Qlgh Qlgh Qlgh Qlgh Qlgh Qlgh Qlgh Qlgh Qlgh Qlgh Qlgh Qlgh Qlgh Qlgh Qlgh Qlgh Qlgh Qlgh Qlgh Qlgh Qlgh Qlgh Qlgh Qlgh Qlgh Qlgh Qlgi Qlgi Qlgi Qlgy Qlgy Qlgy Qlgy Qlgy Qlgy Qlgy Qlgy Qlgy Qlgy Qlgy Qlgy Qlh Qlh Qlh Qlh Qlh Qlh Qlh Qlh Qlh Qlh Qlh Qlh Qlh Qlh Qlh Qlh Qlh Qlh Qlh Qlh Qlh Qli Qli Qli Qli Qli Qli1 Qli1 Qli2 Qli2 Qli2 Qli2 Qli2 Qli2 Qpy Qra2 Qrda Qrdh1 Qrdh1 Qrdh1 Qrdh1 Qrdh1 Qrdh2 Qrdh2 Qrdh3 Qrdh3 Qrdh3 Qrdh3 Qrdh3 Qrdh3 Qrdh4 Qrdh5 Qrdh5 Qrdh5 Qrdh5 Qrdh5 Qrdh5 Qrdh5 Qrdh5 Qrdh5 Qrdh5 Qrdh5 Qrdh5 Qrdh5 Qrdh5 Qrdh5 Qrdh5 Qrdh5 Qrdh5 Qrh Qrh Qrh Qrh Qrh3 Qrh3 Qrh4 Qrh4 Qrh4 Qrh4 Qrh4 Qrh4 Qrh4 Qrh4 Qrh4 Qrh5 Qrh5 Qrh5 Qrh5 Qx la unmapped unmapped 41 42 43 3 43 000m. E 44 44 45 45 46 46 47 47 48 48 49 49 3 50 3 50 51 51 52 52 53 53 54 54 42 94 000m. N 95 95 96 96 97 97 98 98 99 99 43 00 43 00 01 01 02 02 03 03 04 04 05 05 06 06 07 07 08 38 o 54' 41" N 118 o 43' 27" W 38 o 54' 36" N 118 o 50' 22" W 38 o 46' 44" N 118 o 47' 10" W 38 o 46' 48" N 118 o 40' 15'' W 42 41 08 NEVADA BUREAU OF MINES AND GEOLOGY Prepared as part of the STATEMAP components of the National Cooperative Geologic Mapping Program in cooperation with the U.S. Geological Survey OPEN-FILE REPORT 09-13 PRELIMINARY GEOLOGIC MAP OF THE SOUTHERN PART OF THE LOWER WALKER RIVER AREA, MINERAL COUNTY, NEVADA 94 Qe Qfi Qflp Qfo Qfy Qlgh Qlgi Qlgy Qlh Qli Qli1 Qli2 Qlo Qly Qpy Qra1 Qra2 Qrda Qrdh1 Qrdh2 Qrdh3 Qrdh4 Qrdh5 Qrh Qrh1 Qrh2 Qrh3 Qrh4 Qrh5 Qx la Walker Lake Active gravel bars Beach gravel deposits Miscellaneous deposits Holocene playa sediments Late Pleistocene beach gravel Holocene alluvial fan deposits Historical lacustrine sediments Active delta of the Walker River Late Holocene lacustrine sediments Late Pleistocene lacustrine sediments Disturbed area / anthopogenic deposits Late Pleistocene alluvial fan deposits Middle to early(?) Pleistocene fan deposits Holocene to late Pleistocene eolian sediments Historical channels, bars and terraces, undivided Undivided lacutrine sediments, mainly mud and sand Active river channel river channel and emergent bars Late Holocene beach gravel and related shoreline features Older pre-1997 fluvial deposits, possibly coeval with Qrdh2 Historical delta deposits of the Walker River (ca. 1882-1900) Historical delta deposits of the Walker River (ca. 1900-1919) Historical delta deposits of the Walker River (ca. 1919-1925) Historical delta deposits of the Walker River (ca. 1925-1946) Historical delta deposits of the Walker River (ca. 1946-1997) Youngest pre-1997 fluvial deposits, coeval with part of Qrdh5 Intermediate pre-1997 fluvial deposits, coeval with part of Qrdh4 Channels and bars related to flooding and channel migration in 1997 Late Pleistocene fan-pediment / lacustrine platform veneer sediments Oldest historical channel deposit in map area, possibly coeval with Qrdh2 Middle to early(?) Pleistocene lacustrine sediments (cf. Reheis et al., 2002) Late Pleistocene lacustrine sediments. Includes Sehoo highstand of Lake Lahontan Piedmont deposits of the Wassuk and Gillis Ranges (based in part on Demsey, 1987) Lacustrine Deposits of Walker Lake and Lake Lahontan (based in part on Demsey, 1987) Fluvial channel, bar, and terrace deposits of the Walker River (based in part on Adams, 2007) Historical beach gravel and related shoreline features. Age ranges from 1868-1882 to the present Delta deposits of the Walker River (approximate age ranges adapted from Blair and McPherson, 1994) Youngest late Pleistocene lacustrine sediments. Includes gravel deposits related to stable lake level at 1310-1315 m Qrdh5 Qrda Qly Qlgy Holocene Qfy Qfi Historical period (ca. 1888-2008) Pleistocene Fluvial Deposits of the Walker River Channel and terrace deposits Delta deposits Lacustrine Deposits of Walker Lake and Lake Lahontan Sand and mud Beach gravel Piedmont Deposits of the Wassuk and Gillis Ranges Miscellaneous Deposits Playa Eolian Lake Disturbed Qe Qflp Qfo Qlgh Qlgi Qlh Qli Qli1 Qli2 Qlo Qpy Qra1 Qra2 Qrdh1 Qrdh2 Qrdh3 Qrdh4 Qrh Qrh1 Qrh2 Qrh3 Qrh4 Qrh5 Qx la 1 Hussman Spring 2 Schurz 3 Gillis Canyon NW 4 Hu-Pwi Wash 5 Buck Brush Spring 6 Reese River Canyon 7 Gillis Canyon 8 Ghost Dance Ridge 9 Butler Mtn. 10 Cooper Canyon 11 Walker Lake 12 Ryan Canyon Adjoining 7.5' quadrangle names 1 2 5 7 9 3 6 10 11 4 8 12 Map location Projection: Universal Transverse Mercator, Zone 11, North American Datum 1983 (m) Base map: U.S. Geological Survey Schurz 7.5' Quadrangle (1988), Gillis Canyon NW 7.5' Quadrangle (1988), Reese River Canyon 7.5' Quadrangle (1988), Gillis Canyon 7.5' Quadrangle (1988) Scale 1:24,000 CONTOUR INTERVAL 10-40 FEET kilometer 0 0.5 1 mile 0 0.5 1 feet 0 1000 2000 3000 4000 5000 Internal contact Solid where certain and location accurate. Contact Solid where certain and location accurate, long-dashed where approximate, short-dashed where inferred, dotted where concealed; queried where uncertain. ? Wave-modified fault scarp õõõõõõõõõõõõõõõõõõ Erosional shoreline Solid where certain and location accurate; queried where uncertain. Triangles point onshore. Lacustrine spit or bar Solid where certain and location accurate; queried where uncertain. Fault Solid where certain and location accurate, long-dashed where approximate, short-dashed where inferred, dotted where concealed; queried where uncertain. ? ? ? References Adams, K. D., 2007, Late Holocene sedimentary environments and lake-level fluctuations at Walker Lake, Nevada, USA: Geological Society of America Bulletin, v. 119, no. 1/2, p. 126—139. Blair, T. C., and McPherson, J. G., 1994, Historical adjustments by Walker River to lake-level fall over a tectonically tilted half-graben floor, Walker Lake Basin, Nevada: Sedimentary Geology, v. 92, p. 7—16. Demsey, K., 1987, Holocene Faulting and Tectonic Geomorphology Along the Wassuk Range, West-Central Nevada [M.S. thesis]: University of Arizona, 64 p. Reheis, M. C., Sarna-Wojcicki, A. M., Reynolds, R. L., Repenning, C. A., and Mifflin, M. D., 2002, Pliocene to Middle Pleistocene lakes in the western Great Basin: Ages and connections, in Hershler, R., Madsen, D. B., and Currey, D. R., eds., Great Basin Aquatic Systems History: Washington, D.C., Smithsonian Institution Press, p. 53—108. Field work done in 2008-2009 Supported by the U.S. Geological Survey STATEMAP Program (Agreement No. 08-HQ-AG-0053) DRAFT Preliminary geologic map Has not undergone office or field review Will be revised before publication Edited by XXXXXXXXXXXXXXXXX Compilation by P. Kyle House Cartography and map production in ESRI ArcGIS v9.3 (ArcGeology v1.3) by Heather Armeno First Edition, October 2009 Printed by Nevada Bureau of Mines and Geology This map was printed on an electronic plotter directly from digital files. Dimensional calibration may vary between electronic plotters and X and Y directions on the same plotter, and paper may change size; therefore, scale and proportions may not be exact on copies of this map. For sale by: Nevada Bureau of Mines and Geology 2175 Raggio Pkwy. Reno, Nevada 89512 ph. (775) 784-6691, ext. 2 www.nbmg.unr.edu; [email protected] 2058 PRELIMINARY GEOLOGIC MAP OF THE SOUTHERN PART OF THE LOWER WALKER RIVER AREA, MINERAL COUNTY, NEVADA P. Kyle House and Kenneth D. Adams 2009