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la

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unmapped

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000m

. N

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0101

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0404

0505

0606

0707

08

38o 54' 41" N118o 43' 27" W

38o 54' 36" N118o 50' 22" W

38o 46' 44" N

118o 47' 10" W

38o 46' 48" N118o 40' 15'' W

4241

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 SurveyOPEN-FILE REPORT 09-13

PRELIMINARY GEOLOGIC MAP OF THE SOUTHERN PART OF THE LOWER WALKER RIVER AREA, MINERAL COUNTY, NEVADA

94

Qe

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Qrdh1Qrdh2Qrdh3Qrdh4Qrdh5

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Qrh1Qrh2Qrh3Qrh4Qrh5

Qxla Walker Lake

Active gravel bars

Beach gravel deposits

Miscellaneous depositsHolocene playa sediments

Late Pleistocene beach gravel

Holocene alluvial fan deposits

Historical lacustrine sediments

Active delta of the Walker River

Late Holocene lacustrine sedimentsLate Pleistocene lacustrine sediments

Disturbed area / anthopogenic deposits

Late Pleistocene alluvial fan depositsMiddle 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 Qrdh5Intermediate 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

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Histor

ical p

eriod

(ca.

1888

-2008

)

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ocen

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Fluvial Deposits of the Walker River

Channel andterrace deposits Delta deposits

Lacustrine Deposits of Walker Lake and Lake Lahontan

Sand andmud

Beach gravel

Piedmont Deposits of the Wassuk and Gillis Ranges

Miscellaneous Deposits

Playa Eolian Lake Disturbed

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1 Hussman Spring2 Schurz3 Gillis Canyon NW4 Hu-Pwi Wash5 Buck Brush Spring6 Reese River Canyon7 Gillis Canyon8 Ghost Dance Ridge9 Butler Mtn.10 Cooper Canyon11 Walker Lake12 Ryan Canyon

Adjoining 7.5'quadrangle names

1 2

5 7

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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

kilometer0 0.5 1

mile0 0.5 1

feet0 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

õ õ õ õ õ õ õ õ õ õ õ õ õ õ õ õ õ õErosional 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 2008-2009Supported 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 publicationEdited by XXXXXXXXXXXXXXXXXCompilation by P. Kyle HouseCartography and map production in ESRI ArcGIS v9.3 (ArcGeology v1.3) by Heather ArmenoFirst Edition, October 2009Printed by Nevada Bureau of Mines and GeologyThis 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; nbmgsales@unr.edu 2058

PRELIMINARY GEOLOGIC MAP OF THE SOUTHERN PART OF THE LOWER WALKER RIVER AREA, MINERAL COUNTY, NEVADA

P. Kyle House and Kenneth D. Adams2009