GEOLOGIC MAPSOUTHERN PART OF THEPUEBLO MOUNTAINS

HUMBOLDT COUNTY, NEVADA0 0 0 b0 0 0 y

Rollins BurnomI I Oregon Stale University

970

2000 000 0 2000 4000 6000 e000 FEETII ii I I I I I

Cnntour IntevuI 40 Feet- Datum is mean Sea Level

Approvimate Mean :. Declinatian 965

R. 28 E . R 29 E. R 30 E.

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E

T47N

A

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rf

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fl V

U

ExPL:::TioN

0

----;v _ I I ° L. Undifferentia t e d Slumped and Slide Areos

m \ \ - 1 : ,//r I r

c:ee1 Pi / Lseaetrine, fluvial, and Colion.

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T 46N. 7

LATE TERTIARYw OS m.

///Middle Miocene to Pliocene

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.

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--.

>Tr 4i 4/ Dissected Grovel Deposits

._.v.!.I i::._ ii / /t 1 / Uncovsvlidated, poorly sortnd nebble lv boulder

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J,///_J/,

.J/nive gravels composed at volcanic canstduents.

St 2 j 23

Q° /\7't D5) .

C 0 N T I N E N T AL/

F///// ZAKE / H-- Al4l

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Tii tY.v.i 7\ 4

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L A K K

,,Sedimentary- Pyroclostic Unit

m ( 'r I,, Poorly to rnoderolly cvnsalidaled valcanic con

cv ' I. I glonnnraten , sandstones, and o11y mudotanes with

' \ '.. ./' \\ I irterbedded pumice flows and vitric welded tufts

2 8 '"? J 2 6

of rhyolitic and Irachylic compositicn ; welded tufts

&OL 9lt 0 \ I mapped as members Al, A2, B, C, and 0.

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yye-' /

___ / . El'L;

ILII ,_,.l1J_/' Rhyclite Unit

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/7 //7 breccia c:m:e

dense , flaw banding ond flow

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<K- :r El

\ \ \ \_ Basalt Unit

\

\ M A P SY M B 0 LS interbed

\ ded or fall tufts, welded and nan-welded ash

\ .n\ -. - - - 0 _ __ flow tufts , cinder beds , and volcanic sandstones;

\

\ \ ::: where approirnatelynfrodnd by sngIe d,obase dike IdI.

\\ _______?_... JURASSIC-CRETACEOUS\ Fault ; dashed where approsimately

boated , dotted where projected

I1C\ dcubtful

maPP:: units, queried where JKbd

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Dor*Po:k: dot d

40

qoortzvein.contains ,sineralioed

Strike and dip of schistosity111111 4PERMO-TRIASSIC

0 5 Trends of lineatianu lying inplanes of schistosity Pm

Strikw and dip of jointing Metosedimentary Unit

Light gray quartz-muscovite and greenish grayquartz- chlorite -muucooite schists With minor

Axial trend of minor folds tao small mntaquartzite; unit oantains mineralized quartzto pint indiaidually veins.

Plate I