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111°00'31°45'

111°07'30"31°37'30"

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Arizona Geological SurveyDigital Geologic Map 13, Plate 1 of 2

Arizona Geological SurveyDigital Geologic Map 13, Plate 1 of 2

SURFICIAL GEOLOGIC MAPS AND GEOLOGIC HAZARDS OF THE AMADO-TUBAC AREA,

SANTA CRUZ AND SOUTHERN PIMA COUNTIES,ARIZONA

November, 2001

Arizona Geological Survey Digital Geologic Map 13citation for this map:

Youberg, A., and Helmick, W R., 2001 Surficial geologic maps and geologic hazards of the Amado-Tubac Area, Santa Cruz and Pima Counties, Arizona:Tucson, Arizona Geological Survey Digital Geologic Map 13 (DGM-13), scale 1:24,000 (2 sheets), with 17 pages of text.

Research supported by the Arizona Geological Survey and the U.S. Geological Survey, National Cooperative Geologic Mapping Program,under USGS award #00HQAG0149. The view and conclusions contained in this document are those of the author and should not be

interpreted as necessarily representing the official policies, either expressed or implied, of the U.S. Government.

Not to be reproduced for commercial purposes

ByAnn Youberg and Walter R. Helmick

Plate 1 - Amado 7.5' Quadrangle

#Y

#Y

#Y

#Y

#Y

#Y

Tumacacori Mountains

Green Valley

Patagonia

Nogales

Arivaca Tumacacori

Amado

PIMA COUNTYSANTA CRUZ COUNTY

MEXICO

!D

5À1n

!D

5½

TUBAC

AMADO

Coronado

National

Forest

Santa

Cru

z Rive

r

Ariva

ca Road

Ruby Roa d

Sierri

ta Mo

untai

ns

Santa

R

ita

Mou

ntains

Patagonia Mountains

Coronado

National

Forest

CoronadoNationalForest

MAP OF THE AMADO-TUBAC AREAShowing the location of the Amado and Tubac Quadrangles

INDEX MAP OF ARIZONA

@DU Normal fault (solid where accurate, D on the downthrown side;

dashed where approximate; queried where uncertain)

Depositional contact (solid where accurate, dashed where approximate)

Geologic Contacts

Other UnitsHolocene and Pleistocene hillslope colluvium QcBedrock, undifferentiatedR

Geology Map Units

Piedmont AlluviumLate Holocene alluvium (<2 ka)Qy£Holocene alluvium (~2 to 10 ka)Qy¢

Undifferentiated Holocene alluvium (<10 ka)QyHolocene to Late Pleistocene alluvium (<130 ka)QlyLate Pleistocene alluvium (~10 to 130 ka)Ql

Latest Pleistocene member (~10 to 20 ka)Ql£

Late Pleistocene member (~75 to 130 ka)Ql¢Middle Pleistocene alluvium (~130 to 500 ka)Qm

Early Pleistocene alluvium (~1 to 2 Ma)Qo

Early Pleistocene to Pliocene alluvium (~1 to 5 Ma)QTs

River DepositsModern river channel deposits (<150 Years)Qyc×

Holocene floodplain and terrace deposits, undifferentiated (<10 ka)Qy×Holocene to Late Pleistocene terrace deposits (<130 ka)Qly×Late Pleistocene terrace deposits (~10 to 130 ka)Ql×

Early Pleistocen terrace deposits (~1 to 2 Ma)Qo×Middle Pleistocene terrace deposits (~130 to 500 ka)Qm×

MAP EXPLANATION

N

1 0 1 Miles

1000 0 1000 2000 3000 4000 5000 6000 7000 Feet

1 0 1 Kilometers

LAYOUT SCALE 1:24,000