1 1⁄2 0 1 MILE

1 0.5 0 1 KILOMETER

Geologic Map of the Castle Rock 7.5' Quadrangle, Arizona and California

By

P. Kyle House, Barbara E. John, Daniel V. Malmon, Debra Block, L. Sue Beard, Tracey J. Felger, Ryan S. Crow, Jonathan E. Schwing, and Colleen E. Cassidy

2018

SCALE 1:24,000 Bedrock geology compiled and modified from John (1987) and Miller and John (1999) by L.S. Beard and D.

Block. Surficial geology mapped by P.K House and D.V.

Malmon between 2008 and 2017

GIS support provided by E. Mennow

Edited by J.L Zigler

Manuscript approved for publication June 18, 2018

Base from U.S. Geological Survey Castle Rock and

Lake Havasu City North Digital Raster Graphics (DRGs)

Coordinate System: NAD 1983 UTM Zone 11N

Projection: Transverse Mercator

Datum: North American 1983

U.S. Department of the Interior

U.S. Geological Survey

Arizona

California

Nevada

MAP LOCATION

Scientific Investigations Map 3411

Pamphlet accompanies map

CONTOUR INTERVAL 40 FEET

DOTTED LINES REPRESENT 20-FOOT CONTOURS

Any use of trade, product, or firm names in this publication is for descriptive purposes only and does not

imply endorsement by the U.S. Government

This map was printed on an electronic plotter directly from digital files. Dimensional calibration may vary

between electronic plotters 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, 1–888–ASK–USGS

Digital files available at https://doi.org/10.3133/sim3411

Suggested Citation: House, P.K., John, B.E., Malmon, D.V., Block, D., Beard, L.S., Felger, T.J., Crow, R.S., Schwing, J.E., and Cassidy, C.E, 2018, Geologic map of the Castle Rock 7.5' quadrangle, Arizona and

California: Scientific Investigations Map 3411, pamphlet 15 p., scale 1:24,000, https://doi.org/10.3133/sim3411. ISSN 2329-132X (online)

https://doi.org/10.3133/sim3411

CORRELATIONOFMAPUNITS

MISCELLANEOU S

DEPOSITS

PIEDMONTALLU VIU M

OFTHEMOHAVEAND

CHEMEHU EVIMOU NTAINS

ALLU VIU MOFTHECOLORADORIVER

ANDRELATEDDEPOSITS

QU ATERNARY

Che me hu e viFormation

Bu llhe adAllu viu m

Bou se

Formation

Ple istoce ne

Plioce ne

Mioce ne

Che me hu e viMou ntains

Plu tonicSu ite of

JohnandWoode n(1990)

Whale Mou ntain

Se qu e nce

Olig oce ne ?

Holoce ne

PIEDMONTALLU VIU M OFTHEMOHAVEANDCHEMEHU EVIMOU NTAINS

ALLU VIU MOFTHECOLORADORIVERANDRELATEDDEPOSITS

Young piedmontalluvium,undivided(recenttoupper Pleistocene)

Unit4(low er Holocene(?)toupper Pleistocene)

Unit4a(upper Pleistocene)

Older piedmontalluvium(middlePleistocenetoupper Pliocene(?))

Intermediate-agepiedmontalluvium,undivided(low er Holocene(?)tomiddle(?)Pleistocene)

Unit3(upper Pleistocene)

Unit3b(upper Pleistocene)

Unit3a(upper Pleistocene)

Unit2(upper middletomiddle(?)Pleistocene)

Inactivepiedmontalluvium(middleHolocenetoupper Pleistocene)

Riversideterracesediments,undivided(upper Pleistocene)

Terrace3

Terrace2

Terrace1

Alluviumof Blythe,Lak eHavasudeltaicfacies(1938topresent)

ChemehueviFormation,undivided(upper Pleistocene)

Sand-dominatedfacies

Mud-dominatedfacies

Older sandandmuddeposits(upper Pleistocene)

Boulder cong lomerate(low er(?)PleistocenetoPliocene)

BouseFormation,undivided(low er Pliocene)

Clay,silt,andsand

Marl or limestone

Alluviumof CastleRock (upper Miocene)

Paleochannel-fill cong lomerate(low er Pliocenetoupper Miocene)

Older fang lomerate(upper Miocene)

Granite-clastfanglomerate(Miocene)

Granitemeg abreccia(Miocene)

Gneiss-clastmeg abreccia(Miocene)

ALLU VIALANDMEGABRECCIADEPOSITS(SYN-EXTENSIONAL)

LISTOFMAPUNITS

CENOZOICVOLCANICROCKSANDSEDIMENTS

Basalt(Miocene)

Sandstone(Miocene)

PeachSpring Tuff (Miocene)

V olcanicflow sandintrusions(MioceneandOlig ocene(?))

Tw o-micag ranodioriteandmonzog ranite(Cretaceous)

ChemehueviPeak g ranodiorite(Cretaceous)

Biotiteg ranodiorite(Cretaceous)

Porphyritichornblende-biotiteg ranodiorite(Cretaceous)

MESOZOICPLU TONICROCKS

Che me hu e viMou ntainsPlu tonicSu ite of JohnandWoode n(1990)

Whale Mou ntainSe qu e nce

Hornblende-biotitequartzdioriteandquartzmonzodiorite(Cretaceousor Jurassic)

Biotitemonzog ranitetosyenog ranite(Cenozoicor Mesozoic)

PROTEROZOICROCKS

Porphyriticmonzog ranite(Mesoproterozoic)

Gneissandmig matite(Paleoproterozoic)

Mylonitizedg neissandmigmatite(Paleoproterozoic)

V olcanic-clastfang lomerate(Miocene)

BullheadAlluvium(low er Pliocene)

MISCELLANEOU SDEPOSITS

Disturbedg round(recent)

EXPLANATIONOFMAPSYMBOLS

Fault—Showing dipvalu e anddire ction;solidwhe re locationis accu rate ;long dash

whe re locationis approximate ;dotte dwhe re locationisconce ale d

Detachmentfault—Hachu re sonu ppe rplate ;solidwhe re locationis accu rate ;

dotte dwhe re locationisconce ale d

Lineament

Fluvial terracescarp—Solidwhe re locationis accu rate ;dashe dwhe re locationis

approximate ;qu e rie dwhe re ide ntity ore xiste nce is u nce rtain

Shoreline—Contactarou ndope nwate rorpartially su b me rg e du nits su chas sandb ars and

marshe s;solidwhe re locationis accu rate ;dashe dwhe re locationis approximate

Eoliansanddeposits(Holocenetoupper(?)Pleistocene)

Gradational contact

[Se e De scriptionof MapU nits(inpamphle t)forcomple te u nitde scriptions.Some u nite xposu re sonthe printe dor

plotte dmapare toosmalltodisting u ishthe colorforu nitide ntification.The se u nitsare labe le dwhe re possible ,and

u nlab e le du nits are attrib u te dinthe database ]

U nconformity

Te rtiary or

Cre tace ou s

CRETACEOU S

PROTEROZOIC

Cre tace ou s

and(or)Ju rassic

V olcanic-clastmeg abreccia(Miocene)

Horizontal bedding

Inclinedbedding —Showing strike anddip

Inclinedmetamorphicfoliation—Showing strike anddip

Inclinedmyloniticfoliation— Showing strike anddip

Inclinedalig ned-mineral lineation—Showing b e aring andplu ng e .May b e comb ine d

withothe rsymb ols

V ertical flow banding ,lamination,layering ,or foliationin

ig neous rock —Showing strike

Inclinedflow banding ,lamination,layering ,or foliationin

ig neous rock —Showing strike anddip

Rive rside te rrace

se dime nts

Goldeng ravel facies

Sandstoneandcong lomerate(Miocene)

BASIN-FILLSEDIMENTS

(POST-EXTENSIONAL)

BASIN-FILLSEDIMENTS(POST-EXTENSIONAL)

ALLU VIALANDMEGABRECCIADEPOSITS

(SYN-EXTENSIONAL)

CENOZOICVOLCANICROCKS

ANDSEDIMENTS

35

23

50

15

47

Activepiedmontalluvium(upper tomiddleHolocene)

PeachSpring Tuff-clastmeg abreccia(Miocene)

Sedimentary breccia(Miocene)

Alluviumof PaloV erdeMesa(low er(?)Pleistocene)

Gneiss-clastfang lomerate(Miocene)

Unit4b(low er Holocene(?)toupper Pleistocene)

Allu viu mof Blythe

Gravel facies

Allu viu mof

PaloVe rde Me sa

Late

Ple istoce ne

Historical

Early Plioce ne

Normal fault—Barandb allondownthrownb lock;solidwhe re locationis accu rate ;

dotte dwhe re locationisconce ale d

Fluvial transportdirection

Sedimenttransportdirectiondeterminedfromimbrication

Sedimenttransportdirectiondeterminedfromflutecasts

Microfossil samplelocality—Showing sample nu mb e r

Goldensandfacies

Contact—Solidwhe re locationis accu rate ;long dashwhe re locationis approximate ;

shortda shwhe re locationis infe rre d;dotte dwhe re locationisconce ale d;

qu e rie dwhe re ide ntity ore xiste nce is u nce rtain

TERTIARY

Mf12892

Geochronolog y samplelocality—Showing sample nu mb e randag e

MESOZOICPLU TONICROCKS

PROTEROZOICROCKS

CMT-17

15.24±0.02 Ma

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1000 0 1000 2000 3000 4000 5000 6000 7000 FEET

John (1987a)

Miller and John (1999)

INDEX MAP SHOWING PUBLISHED GEOLOGIC MAPPING

SOURCES FOR THE CASTLE ROCK 7.5' QUADRANGLE

Mf12892

Mf12895

CMT-17

15.24±0.02 Ma

CMT-4

13.9±0.1 Ma

92JM25

15.54±0.03 Ma

3

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20

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39

27

30

23

25 14

8

4

9

46

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10

60

30

5

7 2

70

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16

22

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65

80

16

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45

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75

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70

10

25

7

50

70

60

75

25 50

22

10

14

40

35

30

5

5

15

32

20

24

70

30

35

12

40

20

40

32

32

32

30

22

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41

10

21

45

40

11

15

60

40

16

41

46

22 15 36

46

46

55

55

10

56

30

18

30

70 37

52

32

35

10

46

31

40

30

51

43

33

41

41

25

25

35

36

40

30

30

55

25

16

44

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75 45

34

42

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25

75

70

38

45

32

65

20

62

38

83

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34

19

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11

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58

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114°22'30"

114°22'30"

114°30'

114°30'

34°37'30" 34°37'30"

34°30' 34°30'

114°22'30"

114°22'30"

114°25'

114°25'

114°27'30"

114°27'30"

34°37'30"

34°35' 34°35'

34°32'30" 34°32'30"

114°30'

34°37'30"

34°30" 34°30'

114°30'

APPROXIMATE MEAN

DECLINATION, 2018

MAGNETIC NORTH

TRUE NORTH 11°

M

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