PRELIMINARY GEOLOGIC MAP OF THE WEST HALF OF THE HAZEN QUADRANGLE, LYON AND CHURCHILL COUNTIES, NEVADA

James E. Faulds and Alan R. Ramelli2009

OPEN-FILE REPORT 09-11PRELIMINARY GEOLOGIC MAP OF THE WEST HALF OF THE HAZEN QUADRANGLE, LYON AND CHURCHILL COUNTIES, NEVADA

Prepared as part of the STATEMAP component of the National Cooperative Geologic Mapping Program in cooperation with the U.S. Geological Survey

Symbology (per FGDC-STD-013-2006)

NEVADA BUREAU OF MINES AND GEOLOGY

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Projection: Universal Transverse Mercator, Zone 11, North American Datum 1927 (m)Base map: U.S. Geological Survey Hazen 7.5' Quadrangle (1985)

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 publication

Compilation by James E. Faulds and Alan R. RamelliCartography and map production in ESRI ArcGIS v9.3 (ArcGeology v1.3) by Matthew Richardson and Irene SeeleyFirst 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 2108

Scale 1:24,000

CONTOUR INTERVAL 10 METERS

kilometer0 0.5 1

mile0 0.5 1

feet0 1000 2000 3000 4000 5000

1 Two Tips2 Eagle Rock3 Soda Lake NW4 Fernley East5 Hazen6 Soda Lake West7 Silver Springs North8 Lahontan Dam9 Sheckler Reservoir

Map location

119o 07’ 30” W39o 37’ 30” N

119o 00’ 00” W

39o 30’ 00” N

119o 07’ 30” W

39o 30’ 00” N

119o 00’ 00” W

39o 37’ 30” N

Contact Long-dashed where approximate, short-dashed where inferred, queried if identity or existence uncertain.

Normal fault Long-dashed where approximate, dotted where concealed; queried if identity or existence uncertain. Showing dip; Ball on downthrown side.

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Other Units

Calcite veins (late Miocene)MIOCENE INTRUSIONS

Colluvial deposits

Mine waste (recent)

QUATERNARY DEPOSITS

Tephra (late Miocene)

Siltstone (late Miocene)Limestone (late Miocene)

Spring deposits (recent)

Silicified muds and silts

Quaternary Lacustrine Deposits

Basaltic breccia (late Miocene)

MIOCENE - EARLY PLIOCENE STRATA

Anthropogenic deposits (recent)

Piedmont and Hillslope Deposits

Basalt intrusions (late Miocene)

Basaltic andesite (late Miocene)

Diatomaceous shale (late Miocene)

Alluvial fan deposits (undivided)

Siltstone and tuffs (late Miocene)Basaltic conglomerate (late Miocene)

Middle Sehoo member (late Pleistocene)

Altered yellowish basalt (late Miocene)

Young alluvial fan deposits (undivided)

Playa deposits (recent to late Holocene)

Eetza member (late? to middle Pleistocene)

Porphyritic basaltic andesite (late Miocene)

Silicified diatomaceous shale (late Miocene)

Young alluvial flat deposits (late Holocene)

Younger aphanitic basalt lavas (late Miocene)

Eolian reworked diatomite mine waste (recent)

Aphanitic basalt lavas and breccia (late Miocene)

Basalt-dominated alluvial fan deposits (undivided)

Massive, commonly tuffaceous sandstone (late Miocene)

Middle Sehoo member, tufa deposits (late Pleistocene)

Middle Sehoo member, silt deposits (late Pleistocene)

Upper Sehoo member, beach deposits (late Pleistocene)

Young alluvial fan deposits (late to middle Holocene)

Silicified ledges, commonly jasperoidal (late Miocene)

Middle Sehoo member, beach deposits (late Pleistocene)

Young alluvial fan deposits (middle to early Holocene)

Middle Sehoo member, gravel deposits (late Pleistocene)

Upper Sehoo member (early Holocene? to late Pleistocene

Middle Sehoo member, silicified sands (late Pleistocene)

Diatomaceous shale, limestone, and siltstone (late Miocene)

Roundstone fluvial gravels (late Miocene to early Pliocene)

Eetza member, silicified sands (late? to middle Pleistocene)

Alluvium in recently active washes (late Holocene to historic)

Diatomaceous shale and lesser sandstone, siltstone (late Miocene)

Basalt lavas and lesser sedimentary rocks, undivided (late Miocene)

Sandstone and lesser fluvial gravels (late Miocene to early Pliocene)

Middle Sehoo member, tufa capped dendritic terrace (late Pleistocene)

Eolian deposits of the Fallon alloformation (late to middle Holocene)

Alluvial fan deposits of the Wyemaha alloformation (late Pleistocene)Alluvial fan deposits of the Paiute alloformation (middle to early Pleistocene)

Roundstone gravels with abundant large dacite boulders (late Miocene to early Pliocene)

Adjoining 7.5'quadrangle names

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Strike-slip fault Dotted where concealed. Arrows show relative motion.

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Strike and dip of foliation in igneous rocksInclined¦33

Strike and dip of beddingInclinedo41

Strike and dip of jointsÄVertical

Former shoreline Long-dashed where approximate.I I I I I I I I I I

SpringATufa moundk

Geothermal wellWell