Qaf Artificial fill (Holocene)

Qs

Qf

Qg1

Qa1

Stream-channel alluvium (Holocene)

Floodplain or ponded deposits (Holocene)

Young terrace-gravel deposits (Holocene)

Young alluvial fan deposits (Holocene)

Qc

Qv

Ql

Qg2

Qa2

Qg3

Qt

Colluvial deposits (Holocene and Pleistocene)

Valley-fill deposits (Holocene and Pleistocene)

Talus deposits (Holocene and Pleistocene)

Landslide deposits (Holocene and Pleistocene)

Young intermediate terrace-gravel deposits (Holocene and Pleistocene)

Young intermediate alluvial fan deposits (Holocene and Pleistocene)

Old intermediate terrace-gravel deposits (Pleistocene)

Qa3

Qg4

Qa5

QTa

Old intermediate alluvial fan deposits (Pleistocene)

Old terrace-gravel deposits (Pleistocene)

Old alluvial fan deposits (Pleistocene)

Oldest alluvial fan deposits (Pleistocene)

Quaternary and Tertiary alluvium (Pliocene and Pleistocene)

VOLCANIC ROCKS

SURFICIAL DEPOSITS

Poverty Mountain Basalt (Pliocene)

Intrusive dike

Pyroclastic deposits

Basalt flows

Basalt of the Shivwits Plateau (Miocene)

Intrusive rocks

Pyroclastic deposits

Basalt flows

Tpi

Tpp

Tpb

Tsi

Tsp

Tsb

Intrusive rocks in Pigeon Canyon (Miocene)Ti

SEDIMENTARY ROCKS

^ms

^mm

^mv

^ml

^mt

Moenkopi Formation (Lower Triassic)

Shnabkaib Member (Lower Triassic)

Middle red member (Lower Triassic)

Virgin Limestone Member (Lower Triassic)

Lower red member (Lower Triassic)

Timpoweap Member (Lower Triassic)

Kaibab Formation (Lower Permian)

Harrisburg Member (Lower Permian)

Fossil Mountain Member (Lower Permian)

Toroweap Formation (Lower Permian)

Woods Ranch Member (Lower Permian)

Brady Canyon Member (Lower Permian)

Seligman Member (Lower Permian)

Hermit Formation (Lower Permian)

Supai Group (Lower Permian and Upper Pennsylvanian)

Esplanade Sandstone (Lower Permian)

Pakoon Limestone (Lower Permian)

Supai Group, undivided (Upper Pennsylvanian)*s

Pkl

Pe

Ph

Pts

Ptb

Ptw

Pkf

Pkh

Qa4

Qaf Qs Qf Qg1

Qg2

Qg3

Qg4

Qa1

Qa2

Qa3

Qa5

Unconformity

Unconformity

Unconformity

QTa

Tpp

TpbTpi

Tsp

Tsb

TsiTi

Unconformity

VOLCANIC ROCKS

SEDIMENTARY ROCKS

^ms

^mm

^mv

Unconformity

^ml

^mt

Unconformity

Pkh

Pkf

Unconformity

Ptw

Ptb

Pts

Unconformity

Unconformity

Ph

Pe

Pkl

*s

Qc Qv Qt

SURFICIAL DEPOSITS

Holocene

Pleistocene

Pleistoceneand Pliocene

Pliocene

Miocene

LowerTriassic

LowerPermian

UpperPennsylvanian

QUATERNARY

QUATERNARYand TERTIARY

TERTIARY

TRIASSIC

PERMAIN

PENNSYLVANIAN

CORRELATION OF MAP UNITS

Qa4

Ql

U.S. DEPARTMENT OF THE INTERIORU.S. GEOLOGICAL SURVEY

Prepared in cooperation with theNATIONAL PARK SERVICE and

BUREAU OF LAND MANAGEMENTPamphlet accompanies map

MISCELLANEOUS FIELD STUDIES MF-2387

Base from U.S. Geological Survey, 1:24000, Last Chance Canyon, Mustang Point, Poverty Spring, Wildcat Ranch, Arizona 1971

Universal Transverse Mercator Projection1927 North American DatumClark 1866 Ellipsoid, Zone 12

Geology mapped in 1997-1998 by G.H. BillingsleyDigital database by J.L. Wellmeyer, M.L. Harr, and S.S. Priest

Manuscript approved for publication February 8, 2002

GEOLOGIC MAP OF THE HIDDEN HILLS AND VICINITY, MOHAVE COUNTY, NORTHWESTERN ARIZONA

By George H. Billingsley, Jessica L. Wellmeyer, Michelle L. Harr, and Susan S. Priest

2002

TR

UE

NO

RT

H

MA

GN

ET

IC N

OR

TH

APPROXIMATE MEAN

DECLINATION, 1997

13.5O

1 1/2 0 1 MILE

1 .5 0 1 KILOMETER

SCALE 1:31,680

CONTOUR INTERVAL 20 AND 40 FEET

ARIZONA

MAP LOCATION

This map was printed on an electronic plotter directly from digital files. Dimensional calibration may vary between electronicplotters and between X and Y directions on the same plotter, and paper may change size due to atmospheric conditions;therefore, scale and proportions may not be true on plots of this map.

For sale by U.S. Geological Survey, Information Services, Box 25286, Federal Center, Denver, CO 80225

Available on World Wide Web at http://geopubs.wr.usgs.gov/map-mf/mf2387/

Any use of trade, firm, or product names in this publication is for descriptive purposes only and does not imply endorsementby the U.S. Government

Printer set upMiro

portrait32W x 52H

Contact

Syncline

Anticline

Strike and dip of beds

Doubly plunging syncline

Fault—Dashed where inferred or approximately located; dotted where concealed; bar and ball on downthrown side. Faults shown as bounding alluvium do not offset alluvium. Number is estimated separation displacement in meters

Landslide Scarp—Headward scarp of landslide; hachures point in direction of slide

Folds—Showing trace of axial surface and direction of plunge; dotted where concealed

Monocline

Inclined—Measured in the field

Implied—Interpreted from aerial photographs, dip amount not determined

Strike of vertical and subvertical joints

Collapse Structure—Circular collapse structures characterized by strata dipping inward towad central point. On Kaibab Formation surface, (Pkh, Pkf) may reflect collapse of deep-seated breccia pipe that originated in Redwall Limestone

Sinkhole—Enclosed depression or cave

Flow direction of basalt

Volcanic Vent

14

C

LIST OF MAP UNITS

12

36°30'00"

T. 36 N.T. 35 N.

113°45'00"

T. 35 N.T. 34 N.

T. 34 N.T. 33 N.

T. 35 N.T. 34 N.

T. 34 N.T. 33 N.

T. 36 N.T. 35 N.

36°27'30"

36°25'00"

36°22'30"

36°20'00"

36°17'30"

36°15'00"113°45'00" 113°42'30" 113°40'00" 113°37'30" 113°35'00" 113°32'30" 113°30'00"

36°30'00"

36°27'30"

36°25'00"

36°22'30"

36°20'00"

36°17'30"

36°15'00"

113°42'30" 113°40'00" 113°37'30" 113°35'00" 113°32'30" 113°30'00"R. 12 W. R. 11 W.R. 14 W. R. 13 W.

R. 12 W. R. 11 W.R. 14W. R. 13 W.

EXPLANATION

58

12

37

6

40

12

37

25

24

23

60

55

12

38

37

4.5

45

45

6 6

12

18

6

52

36

12

24

30

43

2

2

3

2

5

4

3

12

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2

6 7

5

C

4

4

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1

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2

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402

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