8/14/2019 NBMG of074

1/1

11832'30"W

11832'30"W

11835'0"W

11835'0"W

11837'30"W

11837'30"W

3927'30"N 3927'30"N

3925'0"N 3925'0"N

FallonFormation

Wyemaha Formation

Eetza Formation

Bunejug Formation

Sehoo Formation

Young lakedeposits

EaglesHouse rhyolite

Ephemeral playadeposits

Daciteof Rainbow Mountain

Beach and shoreline deposits

Remnantalluvialfan surfaces

Tertiarysediments,undifferentiated

Young fan alluvium, undifferentiated

Young alluvium of recentlyactive washes

Subaerialsilt, sand, and gravel deposits

Youngest fan alluvium of lateHolocene age

Youngest alluvium of recently activewashes

Olivine basaltflows with minorbasaltictuff

Basaltof Rainbow Mountain with basalticdikes

Young fan alluvium ofmiddle to early Holoceneage

Lacustrine silt sand,and mud of theupperSehoo Fm

Youngerfan alluvium of lateto middle Holocene age

Lacustrine silt,sand, and mud ofthemiddle Sehoo Fm

Shallow lakesedimentsoflate to middle Holoceneage

Beach and shoreline depositsof theEetza lacustral cycle

Lacustrine silt,sand, and mud oftheEetza lacustral cycle

Eolian sand derived from lacustrinedeposits of lateto middle Holocene age

Tufa-bearing beach and shorelinedeposits of the middleSehoo lacustral cycle

Lacustrine silt,sand, and mud and locally beach gravel of the lower Sehoo Fm

Lacustrine silt,sand, and mud ofthelower and middleSehoo Fm, undifferentiated

Massivedendriticand lithoid tufa associated with the middleSehoo lacustral cycle

Beach and shoreline depositsassociated with principal middle Sehoo lacustral cycle

Subaerialsand and alluvialfan gravel depositsseparating theSehoo and Eetza lacustral cycles

Qsu

Ql

QTb

QTs

Qai3

Qay1

Qay2

Qe

Qeg

Qfe

Qfs

Qfy

Qfy1

Qfy2

Qfy3

Qlb

Qp

Qsl

Qslm

Qsm

Qsmb

Qsmd

Qsmt

Qws

Teh

Trb

Trd

Ts

Alluvial and aeolian (subaerial) deposits Lacustrine deposits

Bedrock units

QUATERNARY

TERTIARY

Mioceneto

Pliocene

middle/early

Pleistocene

late

Pleistocene

Holocene

Qsu

Ql

QTb

QTs

Qai3

Qay1

Qay2

Qe Qeg

Qfe Qfs

Qfy

Qfy1

Qfy2

Qfy3

Qlb

Qp

Qsl

Qslm

Qsm

QsmQsmbQsmd Qsmt

Qws

Teh

Trb

Trd

Ts

PRELIMINARY GEOLOGIC MAP OF THE LAHONTAN MOUNTAINSQUADRANGLE, CHURCHILL COUNTY, NEVADA

John W. Bell, P. Kyle House, and S. John Caskey2007

Preparedas part of theSTATEMAPcomponent of theNational CooperativeGeologic MappingProgram in cooperationwith the U.S.GeologicalSurveyNEVADABUREAUOF MINESANDGEOLOGY OPENFILEREPORT 07-4 PRELIMINARYGEOLOGICMAP OF THE LAHONTANMOUNTAINSQUADRANGLE,CHURCHILLCOUNTY, NEVADA

1 2

4 6

7

1 Indian Lakes2 Stillwater3 FoxtailLake4 GrimesPoint5 LahontanMountains6 DiamondCanyon7 CarsonLake8 BunejugMountains9 Fourmile Flat

Adjoining 7.5'quadrangle names

3

5

8

118o30'0"W

39o22'30"N

118o30'0"W

39o30'0"N39o30'0"N

39o22'30"N

Strikeand dipof flow bandingor flow foliationin volcanicrocks

I nc li ne d V er ti ca l 33

Beach ridge

Fieldwork donein 2006-2007Supportedby theU.S. GeologicalSurvey STATEMAPProgram(AgreementNo.06-HQ-AG-0021)

DRAFTPreliminary geologic mapHas not undergoneofficeor field reviewWill be revisedbefore publication

EditedbyDickMeeuwigCompilationby JohnW.Bell,P.KyleHouse,andS.JohnCaskeyCartographyandmap production in ESRIArcGIS v9.2

by JordanHastings,Elizabeth Crouse,and Matthew RichardsonFirstEdition, July 2008Printedby NevadaBureauof Mines and Geology

Thismapwas printed on an electronicplotter directly fromdigital files.Dimensional calibration mayvary between electronic plottersand Xand Ydirectionson the same plotter, and paper maychangesize;therefore, scale and proportions maynot be exact on copies of thismap.

For saleby:NevadaBureau ofMines and GeologyUniversityofNevada,Reno/178Reno,Nevada 89557-0178ph.(775) 784-6691,ext. 2www.nbmg.unr.edu;nbmgsales@unr.edu

1899

Base map:U.S. Geological Survey GrimesPointandLahontan Mountains 7.5'quadrangles (1985)

Projection:UniversalTransverse Mercator, Zone 11,North AmericanDatum1927 (m)

Scale1:24,000

CONTOURINTERVAL40 FEET

kilometer0 0.5 1

mile0 0.5 1

feet0 1000 2000 3000 4000 5000

1954 Earthrupture Solidwhere certain and locationaccurate,long-dashedwhere approximate,short-dashed whereinferred.

Symbology (per FGDC-STD-013-2006)

9

Normal fault, moderately to steeplydipping Solidwherecertain and locationaccurate, long-dashed where approximate,short-dashedwhere inferred,dotted where concealed; queriedifidentity or existence uncertain. Dip ofcontactshown locally.

%25

? ? ?

Contact Solidwhere certain and locationaccurate,long-dashed whereapproximate, short-dashed where inferred.

Shoreline Thickat 1332m Sehoo highstand,thin atrecessionalscarps.Hachurespoint toward water body.

Strikeanddipof bedding

Inclinedo41