LEGEND

SURFICIAL ROCKS

GEOLOGICAL

CHARLES D.WALCOTT , DIRECTOR

l08°oo'

38°oo'fr < — r

SYMBOL

Alluvium

/h f///' and rire-rdepositsJ

TO

Tin

COLORADO

TELLURIDE QUADRANGLE

107°4538°oo'

Wl/ipple Mt.

G1 a (xalT) owldei-deposit

SEDIMENTARY ROCKS

SHEET SECTIONSYMBOL SYMBOL

San. Mig u.elformation

/ /'cnilh/rui’r/ih’ /mordantingpebbles of granite,schistquartzite,, limestone,and/ sandstone J

above sea level1

//A //

above sea. level.

sKmci

een ba/dk

oTk.Mme

MancossLale

(includes the Benton and.JHobrara, formations and■part ofthePierre)

erld

Rgg ie T

Dakotatbimatioii

(mainly sandstone, with/shale and impure coed

Tun n

> Bullion

Mc.Eimoformation

(alternating sandstonesand shales J

Diamond Hill

JnnctLO

ex* TTrn

' '-J&C*.

Tellurite | sPeak

La Platasandstone

i (two white sandstone bedsV with dark. lime stone between)

Deerc+ra i

uWlWitLO

/ J5T7yCicLO VeO/.

(FaH

Doloresformation

(sandstone, { grit,conglomerate,andscrmeshalefprevailingcolor red)

S 1 1 yer-La ke QIcasin "S

Balia

QuartziteIGNEOUS ROCKS

Jack

ellie Min

SHEET SECTIONSYMBOL SYMBOL

Bald Mt

ancxi \

Wasatch

Basic dikes

(basalt and severed otherdark/denserocks)

joa/uin

Andesite

f decomposed-relation toother andesites notlcnowrv)

Graniteporphyry

regular intrusive bodies J

' NAed

1L dm

v ^ v~ //

Wilson PeA -^Silver Pick Mine

Gabbro-diorite

(stocks and cLSSooiataddilces or sheets)

G/dnrTx'A

Kroc

Dioxitexaonzonite

(stocks and associateddilces or sheets)

Kmc

wm®m

mmmm

South

Monzonite

( large. stock)

Dionte-poiplryry

(laccoliths, sheets, anddihes)

Rhyolite

(volcanic plugs piercingCretaceous shale)

Grizzly Pk. \

. o Ta rptO o|f^l;opsv^ ‘ = » y.;

Sea - level —

prh

Poto si rhyoliticseries

(several flows andvariable tufPbeds)

is

is

mMM

Tuteiinediaie

series

(commingled andesiticandihjydutie flows,tuff)breccia/, and agglomerate)

s j

mil

San Juanseries

(bedded tuff) breccia,and agglomerate ofandesitic material)

Landslides

(San Miguel formation/ andSon Juan and higher volcanicseries in confused relation/)

37 45'

37°45

108°oo'

pi Henry Gannett, Chief Topographer .

E .M .Douglasjopographer i n chargeTriangulation by Hayden Survey.Topography by Frank Tweedy.Surveyed in 1894.

Scale 62500

iP

5 Kilometers

Areal Geology by Whitman Cross.

Assisted by H.S.Gane,E.C.E.Lord,and A.C.Spencer.Economic Geology by Chester W.Purington.Surveyed In I895“96.

07 45'

Older

rhyolite

(associated ivithAfgankian quartzite)

faults

Landslide boundaries

^ Gold, quartz rains shotringdip and str'tke

-Jition of.July 1899.

I

Known

roductive

‘ormations

Crewel sorneivTiatazcrvferoits

ALGONKIAN EOCENE AND NEOCENE ALGONKIAN JURATRIAS CRETACEOUS EOCENE? PLEISTOCENE