LEGEND

LEGEND

3NE0US ROCKS

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Olderrhyolite

('associated with,TgonJdeab quartzite)

Faults

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U.S. GEOLOGICAL SURVEY

CHARLES D.WALCOTT , DIRECTOR

108° oo'

38'oo'n

COLORADO

SURFICIAL ROCKS

/Areas of Stcrficidlrocks are shoitm 7>ypatterns of dotsand circles.)

slide ho lindanesSections

37°45'

TELLURIDE QUADRANGLE

I07°45'38°00

> A. Z+ *{ " -

Allavxum

flake, and river deposits)♦.'•’LvA

GlaeialLo^dderdeposit

SEDIMENTARY ROCKS

(Areas of Sedimentaryrocks are shownby patterns ofparallel lines.)

quartzite, hmestone,and sandstone)

Mancosstale

fincludes fheHentorvanddvobrara -formations andpart offheHerre)

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Dakotaformation

(meanly sandstone, withshale- and- impure- cocd-J J

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Mc.Elmoformation

(alternating sandstonesand shales)

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s&Saaste

(two white sandstone bedswith, dark, Hmestone between)

Doloresformation

(sandstone,grit, conglomerate,and'SomesTidlefprevailingcolor red)

QuartziteIGNEOUS ROCKS

(.Areas of Igneous rooks are shown lypatterns of trianglesand rhombs J

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Basic dikes

f basalt and several other

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Andesite

A deearnposed-relatioTt toother andesites notlcnownJ

Granite-porpkyry

(irregularintrusivc bodies)

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Gahhro-dioidte

Cstocks and associateddikes or sheets j

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Diorite-mouzouite

f stoefes and associated,dikes or sheets)

Monzonite

( Targe stock-)

Dioiate-

porphyry

(laccoliths, sheets, anddikes)

RJiyoiite

fvolcanic plugs piercingCretaceous shale)

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Poto si rhyolitic

senes

A several flows andaridble tuff beds)

Inteime diate

sexa.es

(commingled andesiticcmdThyoatio flows, Pdf breccias, and agglomerate)

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sexaes

( bedded tuff breccia,and agglomerate ofandesitic material)

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37 45'

Scale 62500

108°00'

) Henry Gannett,ChiefTopographer .E.M .Douglas,Topographer in chargiV Triangulation by Hayden Survey.

Topography by Frank Tweedy.Surveyed in I894--

107°45'

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“9£>.

CoiitoiLi-iiilervBl 100 fe et.

Datum is mean sea level.

Edition of Mar 1899 .

Landslides

(San Higuel formation, andSanJiuxnand higher volcanicseries in contused j elation)

Deg&rvd/ is corvtdrvuedowfhe left margin/.

EOCENE AND NEOCENE ALGONKIAN JURATRIAS CRETACEOUS EOCENE? PLEISTOCENE