VALLEY

THRUST

TH RUST

VALLEY

GASS

GASS

PEAK

THR UST

YUCCA FOREST

FAULT

MORMON

PASS

FAULT

G

AS

S

S

PRING

FAULT

CORN CREEK SPRINGS

FAULT

DEER CREEK THRUST

DEE

R

CREEK

THRUS

LEE

T

CANYON

THRUST

LA

MADRE

GRIFFITH

FAULT

FAULT

KEYSTONE

THRUST

KEYSTONE

THRUST

BIRD SPRING THRUST RED SPRING THRUST

RED 

THRUST

SPRING

WHITNEY MESA FAULT

FRENCHMAN

FAULT

MOUNTAIN

CASHM AN FAULT

DECATUR FAULT

VALLEY VIEW FAULT

TURTLEHEAD MOUNTAIN

FAULT

HIDDEN

VALLEY

FAULT

FOSSIL RIDGE FAULT

LAS

VEGAS

VALLEY

SHEAR

ZONE

LAS

VEGAS

VALLEY

SHEAR

ZONE

BOX CANYON

FAULT

BROWNSTONE

FAUL

K

T

EYSTON

E

T

H

R

UST

T

MACKS

CANYON

THRUST

EGLINGTON

FAULT

RED

SPRING

THRUST

LAS

VEGAS

VALLEY

SHEAR

ZONE

KEYSTONE 

THRUST

?

?

?

?

?

?

? ?

?

? ? ? ?

?

? ?

?

?

?

35

40

10

43

19

26

21

15

10 9

16

40

65

43

24

32

40

18

19

31

66

75

45

31

30

50

70

38

48

18

16

30 23

16 30

25

43

5

5

7

7

4

11

8

8

8

13

7

11

5

6

20

33

20

50 19

38

65

35

25 20

33

70

89

65

75

22

9

35

25

57

85

17

24

44

26

8

28

41

22

30

21

15 25

28

37

17

33

77

15

75

75

26

29

30

26

23

25

33

31 38

18

20

49

37

16

24

22

28

25

31

36

34

44

34

46

37 48

65

36

42

36

40

34

20

25

26

32

26 28

41 20

40

50

40 28

34

25

34

32

15

8

28

53

40

20

35

12

23

10

15

13

15

15

12

15

10

10

10

15

9

9

8 7

39

62

38 60

16

3

13

10 19

8

8

6

4

12

11

8 9

8

3

9

10

10

10

8

8

9

8

12

13 18

10 68

36

25

32

22

27

18

34

41

38

34

42

37

42

23

22

25

20

72

30

20

11

32

26

42

18

12

20

5

23

6

16

26

20

44

20

10

21

40

12 9

40

27

16

25

18

61

5

5

16

15

10

34

17

25

55

18 32

77

75

60

20

60

53

44

22 17

68

22 35

27

45

33

23

25

27

8 38

73

68

47

72

40

35

74 85

65

78

10

28

23

26

20

9

12

28

8

12

16 34 25

40

5

10 15

15

15

8

8

12

12

75

55

40

35

55

55

20

34

32

22

17

18

55

75

31

26

40

38

41

14

18

17

22

23

54

44

40

25

49

38

35

35

38

36

41 34

17

44

39

40

26

46

24

45

37

35

32

39

28

28

46

28

26

35

10

20

20

23

12

15

15

25

25

25

50

23

81 84

79 74

30

75

75

85

85

75

82

12

65

80

85

74

15

5

10

80

36

36 35

31

20

36

20

21

27 25

31

26

14

29

26

24

24

23

3

8

20

17 15

24

17

18

36

19

11

21

10

10

20

28

45

35

63

29

5

15

18 7 10

33

24 25

21 31

24

46

33

66

31

24

36

20

18

22

25

33

23

59

40

45

53

45

44

62

16

26

25

31

34

31

18 15

10

7

66

10

30

22 44

10

22

4

10

62

34

35

20

50

40

22

15

30

6

12

7

27

60

30

46

60

25

22

53

20

20

66

17

20

20

45

15

20

28

20

15

20

12 15

12

25

30

8

10

15

12

12

35

24

20

10

20 50

65 75

18

18

62

62 65

63

25

50

20

30

30

25

16

13

17

18

15

18

25

13 20 12

18

21

5

7

13

10

10

12 8

30

25

25

25

35

4

30

30 27

15

15

25

25

20

15

10

10

10

12

25

18

55

22

60

60

45

45 60

30

40

25

25

15

37

28

20

60

40

20

40

20

45

45

45 40

30

20

10

30

60

45

45

45

72

53

47

44

34

10

30

72

40

66

56

71

86

17

57

50

65

55

55

30

25

35

45

55

55

75

35

25

55

75

40

15

15

20

60

23 45

55

80

55

45

55

55

88 51

50

76

72

63

52

36

72

81

70

84

50

56

58

88

68

47

55

44

45

7

63

75

45

38

35

46

42

60 25

17

24

65

70

60

35

70

65

65

55

50

50

50

40

40

35

35

10

15

15

60

45

45

25

38 8

42

30

40

35

15 40

60

40

15

40 10

10

20

10

30

35

15

30

20

15

40

12

15

15

35

20

15

5

13

30

30

25

20

10

5

15

10

15

15

15

15

15

30

30

20 15

18 15

25

15

15

15

35

7

50

30

55

45

5

15

10

15

15

32

10

10

25

25

20

45

20

30

55 5

65

73

80 55

50

55

45

40

47

60

55

65

35 30

20

25

40

25

40

15

15

20 35

49

30

25

25

25

45

45

45

35

15

14

20

20

5

15

35

65

10

60

14

15

12

25

15

20

15

25

30

10

60

75

10

30

30

10

15

5

15 25

5

55

60

50

55 55

6

82

44

24

27

50

38

28

27

25

60

66

17

28

28

27

22

41

22

47

40

35

30

14

19

21

26

65

41

15

28

38

55

42

37

39

22

36

41

35

21

36

37

24

18

42

50

32

84

33

30

17

61

24

45

43

70

26 14

11

16

19 28

41

31

4

40

15

35

25

34

18

43

15

15 21

24

20

38

24

59

61

41

66

36

39

34

42

26 40

23

17

85

16

20

37

30 20

25

26 30

53

50

27 32

36

10 25

20

33

62

30

28

76

27

BASIN

LV-29

LV-28

LV-16

TSQ-2

LV-14, 15

LV-13

LV-19, 20

LV-18

LV-17

LV-2 LV-3

LV-1

WM-1A LV-6

Qao

Qao

Qai

Qai

Qau

Qai

Qai

Qao

Qao

Qao

Qao

Qai

Qai

Th

Th

Th

Qai

Qai

Qai

Qai

ai

Qayy

Qayy

Qayy

Qay

DOm

Qay

Qay Qay

QTa

QTa

PMb

PMb

PMb

PMb

PMb

PMb

PMb

PMb

PMb

Qay

Pbu

Pbu

Pbu

Qay

PMbl

PMbl

PMbl

PMbl

PMbl

Qcf

Qcf

Qayo

Qayo

Qaiy

Qayo

Qayo

Qayo

Qscd

Qscd

Qscd

Qscd

Qscd

Qscd

Qscd

Qscd

Qsab

Qayo

Qayo

Qayo

Qayo

Qayo

Qayo

Qayo

Qayo

Qayo

Qayo

Qayo

Qayo

Qayo

Qayo

Qayo

Qayo

Qayo

Qayo

Qfy

Qfy

Qfy

Qfy

Qayo

Qayo

Qayo

Qayo

Qayo

Qayo

Qayo

Qayo

Qayo

Qayo

Qai

Qai Qai

Qai

Qai

Qai

Qai

Qai

Qai

Qai

Qcf

Qcf

ml

ml

mu

ml

ml

mu

mu

ml

ml

ml

ml

ml

mu

mu

mu

Qcf

Qcf

Qcf

Qcf

Qcf

Pkt

Qcf

Qcf

Pkt Qcf

Qcf

Qcf

Qcf Qcf

Qcf

Qcf

Qcf

Qcf

Qai

Qai

Qai

Qai

Qai

Qai

Qai

Qai

Qai

Qai

Qai

Qai

Qai

Qai

Qai

Tm

Pkt

PMc

Pr

Qai

Qai

Qai

Qai

Tmd

Tpm

Tmd

Qai

Qai

Qai

Qai

Qai

Qai

Qai

Qai

Qai

Qai

Qai

Qai

Qai

Qai

Qai

Qai

Qayo

Qay

Qay

Qay

Qay

Qay

Qay

Pkt

Pr

Pr

Pr

Pr

Pr

Pr

Pr

Pkt

Pkt

Qay

Qay

Qay

Qd

Qfy Qse

Qse

Qse

Qse

Qse

Qse

Qfy

Qd

Qay

Qay

Qsu

Qsu

Qsu

Qay

Qao

Qao

Qao

Qao

Qao

Qao

Qao

Qao

Qsu

Qao

Qao

Qao

Qd

Qao

Qao

Qao

Qay

Qay

Qayy

Qayy

Qayy

Qayy

Qayy

Qayy

Qayy

Qayy

Qayy

Qayy

Qayy

Qayy

Qayy

Qayy

Qaiy

Qaiy

y

Qayy

Qayy

Qayy Qayy

Qayy

Qay

Qd

Qd

Qd

Qd

Qd

Qay

Qay

Qay

Qsyy

Qsy

Qay

Qay

Qay

Qay

Qay

Qay

y

QTa QTs QTa

QTa

QTa

QTa

Qay

Qay

Qay

Qay

Qay

Qay

Qay

Qay

Qay

Qfo

Qfo

Qfw

Qay

Qay Qay

Qay

Qay

Qay

Qay

Qay

Qay

Qay

Qay

Qay

Qau

Qau

Qau

Qau

Qau

Qau

Qau

Qau

Qao

Qao

Qao

Qao

Qao

Qao

Qao

Qao

Qao

o

Qao

Qau Qau

Qau

Qau

Qau

Qau

Qau

Qau

Qau

Qau

Qau

Qau

Qau

Qau

Pkt

Pkt

Mm

MDu

MDu MDu

MDu

Mm

Mm

Pr

Pr

Pr

Pkt

Pkt

Pkt

Pkt

Pkt

Qau

Qau

Qau

Qay

Qay QTs

QTs

QTs

QTs

QTs

QTs

QTs

QTs

QTs

QTs

Tm

Tm

Tm

QTs

QTs

QTs

Qay

Qay

Qso

Qso

Qso

Qso

Qay

Qay

Qay

QTa

QTa

QTa

QTa

Qay

Qau

Qau

Qau

Qau

Qao

Qau

Qau

Qau

Qay

Qay

Qay

Qay

Qay

Qay

Qay

Qay

Qayy

Qayy

Qayy

Qayy

Qayy

Qaiy

Qaiy

Qaoi

Qaoi

Qaoi

Qaoi

Qaoi

Qcf

Qaoi

Qaoi

Qaoi

Qaoi

Qaoi

Qaoi

Qaoi

Qaoi

Qaoi

Qaoi

Qaoi

Qaoi

Qaoi

Qaoi

Qaoi

Qaoi

Qaoi

Ja

Ja Ja

Jkc

Jkc

Jkc

Jkc

Ja

Ja

Qaoi

Qaoi

Th

Thb

Mm

MDu

MDu

Mm

Xg

PMc

PMc

Pbu

Pbu

Pbu

Pbu

Pbu

Pbu

Pbu

PMbl

PMbl

PMbl

PMbl

PMbl

PMbl

PMb PMb

Mm

Mm

Mm

MDu

DOm

DOm

DOm

DOm

DOm

DOm

DOm

DOm

DOm

MDu

MDu

MDu

MDu

MDu

Du

MDu

MDu

Du

MDu

DSu

Oes

O

p

O

p

O

p

O

p

O

p

Oes

Oes

Oe

Oe

Oe Oes

Oe

DSu

DSu

Dsi

Dsi

Mm

Mm

Mm

Mm

Mm

Mm

Mm

Mm

Mm

Mm

Mm

MDu

Mm

n

n

n

n

n

n

n

n

n

n

n

n

n

n

n

n

n

b

t

bk

bk

bk

bk

bk

bk

bk

bk

bk

bk

c

c

Zw

Zs

Zs

Zw

Zw

Zw

A

B'

CO TTO

NWOOD FAULT

A'

B

C'

TURTLEHEAD

MOUNTAIN

LA MADRE FAULT

FAULT

BROWNSTONE

BASIN

FAULT

BOX

CANYON

FAULT

COTTONWOOD

FAULT

RED SPRING

THRUST

RED SPRING

THRUST

36°15'

115°30'

36°00' 0 5 10 KILOMETERS

Figure 3

C. Structural model 2 of the eastern Spring Mountains

based on Matthews (1988, 1989).

EXPLANATION

Normal fault—Dotted where concealed. Ball and bar on downthrown sideThrust fault—Sawteeth on upper plate

Overturned syncline

Quaternary-Tertiary rocks, undividedKeystone thrust plate

Bird Spring thrust plate and semi-autochthonous rocks

BIRD SPR NI G THRUST

KEYSTONE THRUST

CENOZOIC

THRUST

TURTLEHEAD

MOUNTAIN

FAULT

LA MADRE

FAULT

BROWNSTONE

BASIN

FAULT

BOX

CANYON

FAULT

KEYSTONE

THRUST

RED SPRING

THRUST

RED SPRING

THRUST

KEYSTO NE THRUST

WILSON

CLIFFS T HRUST

36°15'

115°30'

36°00'

BIRD SPR NI G THRUST

COTTONWOOD

FAULT

0 5 10 KILOMETERS

Figure 3

B. Structural model 1 of the eastern Spring Mountains

based on Burchfiel and others (1997), Axen (1985), and Davis (1973).

EXPLANATION

Normal fault—Dotted where concealed. Ball and bar on downthrown sideThrust fault—Sawteeth on upper plate

Overturned syncline

Quaternary-Tertiary rocks, undividedKeystone thrust plate

Bird Spring, Wilson Cliffs, and Red Spring thrust plates and semi-autochthonous rocks

2

6

4

5

3

WHEELER 1

GRABEN

THRUST

LEE

TROUGH

SPRING

FAULT

LA

MADRE

FAULT

DEER

WEST SPRING MOUNTAINS FAULT ZONE

STATE LINE

FAULT ZONE

RED

SPRING

THRUST

REDSPRINGTHRUST

YUCCA FOREST FAULT

MORMON PASS FAULT GASS SPRING FAULT

GASS

PEAK

THRUST

VALLEY

THRUST East Pass

EGLINGTON

FAULT

CASHMAN F AULT

DECATUR FAULT

VALLEY VIEW FAULT

FRENCHMAN MTN. FLT.

WHITNEY MESA

FAULT

COTTONWOOD FAULT

WHEELER

PASS

WHEELER PASS THRUST

VALLEY

ANTICLINE

VALLEY SYNCLINE

CREEK THRUST

MACKS C A N YON THRUST

LEE CANY ON

THRUS T

THRUS T

CANYON

LT AU F GE RID SSIL FO

GRIFFITH

FAULT

LA

MADRE

FAULT

TURTLEHEAD

MOUNTAIN

FAULT

BROWNSTONE

BASIN

FAULT

BOX

CANYON

FAULT

KEYSTONE

THRUST

KEYSTONE

THRUST

STIRLING MINE FAULT

Pahrump

Valley

Mountains

Spring

Area of

figures 3B and 3

C

SheepRange

Las

Vegas

Range

Frenchman

Mountain

Las

Vegas

Valley

Yucca Forest

basin

Gass Peak

basin

Wilson Cliffs

La

Madre

Mou

ntain 36°15'

36°00'

36°30'

116°00' 115°45' 115°30' 115°15' 115°00'

0 5 10 KILOMETERS

Figure 3

A. Map showing major structures in the Las Vegas 30′ × 60′ quadrangle.

EXPLANATION

Measured sections in figure 2

Normal fault—Dotted where concealed.

 Ball and bar on downthrown side Thrust fault—Dotted where concealed.

Sawteeth on upper plate

Red Spring blocks

6 Las Vegas Valley shear zone

Anticline

Syncline

Overturned anticline

Overturned syncline Fault strands of the Las Vegas Valley shear zone and State Line fault zone, based on geophysical methods

Quaternary-Tertiary rocks, undivided

Wheeler Pass and Gass Peak thrust plates

Macks Canyon, Lee Canyon, and Valley thrust plates

Deer Creek, Dry Lake, Keystone, and Red Spring thrust plates

Bird Spring thrust plate, semi-autochthonous rocks, and Frenchman Mountain

CORN CREEK SPRINGS FAULT

LAS VEGAS VALLEY SHEAR ZONE

DEE R CREEK THRUST

B RI D SPRING THRUST

MACKS CANYON THRUST

INCREASINGLY

AUTOCHTHONOUS

cted Paleozoic units in major thrust plates, Las Vegas 30′ × 60′ quadrangle. 

CRATONIC MARGIN

WHEELER PASS

THRUST PLATE

VALLEY

THRUST PLATE

SECTION 2 SECTION 3

31 km WNW

DEER CREEK

THRUST PLATE

SECTION 4 SECTION 5

43 km W 35 km WNW

KEYSTONE THRUST PLATE

15 km SE 18 km WSW SECTION 6

Base of Ely Springs Dolomite

Base of Ely

Springs Dolomite

METERS

300

200

100

0

e: N1/2 sec. 33 and 

Springs 7.5-min. 

own Dolomite measured, 

. Krumhardt, and W.R. 

 Harris and J.E. Repetski 

ses for Devonian units 

Composite section in northern Spring Mountains: secs. 16, 17, 20, and 21, T. 17 S., R. 55 E., Willow Peak 7.5-min. quadrangle (Ely Springs Dolomite into Mississippian and Devonian rocks, undivided [Guilmette Formation]) and SW1/4 sec. 4, T. 17 S., R. 56 E., Cold Creek 7.5-min. quadrangle (Narrow Canyon Formation to Dawn Limestone of Monte Cristo Group) measured, described, and sampled by W.R. Page, A.G. Harris, and A.P. Krumhardt, 1996–98; conodont analyses by A.G. Harris (see Harris and others, in press). Data for Monte Cristo Group above Dawn Limestone from Stevens and others (1996, loc. 20a, Indian Springs section)

Composite section in southern Las Vegas Range: secs. 23 and 24, T. 18 S., R. 61 E., Valley and Gass Peak NE 7.5-min. quadrangles (upper part Mississippian and Devonian rocks, undivided [uppermost Guilmette Formation], and Monte Cristo Group map unit including Battleship Wash Formation); measured, described, and sampled by A.G. Harris, A.P Krumhardt, and W.R. Page, 1998; conodont analyses by A.G. Harris (see Harris and others, in press). Data for Indian Springs Formation from Webster (1969, section K)

Composite section in Lucky Strike Canyon area, northeastern Spring Mountains: sec. 11, T. 19 S., R. 58 E., Corn Creek Springs NW 7.5-min. quadrangle (upper part Pogonip Group into lowermost Mississippian and Devonian rocks, undivided [lower Guilmette Formation]) measured, described, and sampled by W.R. Page, A.G. Harris, and A.P. Krumhardt, 1997; conodont analyses by A.G. Harris (see Harris and others, in press). Data for lower and middle Pogonip Group and Mississippian and Devonian rocks, undivided (Guilmette Formation and Crystal Pass Limestone), from W.R. Page (this report) and Bereskin (1982)

Composite section in Kyle Canyon area, eastern Spring Mountains: E1/2 sec. 16, T. 19 S., R. 59 E., Tule Springs Park and Grapevine Spring 7.5-min. quadrangles (uppermost Nopah Formation into Bullion Limestone of Monte Cristo Group) measured, described, and sampled by W.R. Page, A.G. Harris, and A.P. Krumhardt, 1996 and 1998; conodont analyses by A.G. Harris (see Harris and others, in press). Thickness of Mountain Springs Formation from Cooper (1987)

Composite section near La Madre Spring in the eastern Spring Mountains: Mountain Springs Formation between lat. 36°10'37.7"N., long. 115°31'01" W. (base) and lat. 

36°10'46"N., long. 115°30'54"W. (top), La Madre Spring 

7.5-min. quadrangle, measured, described, and sampled for conodonts by Miller and Zelinsky (1981) and by W.R. Page, A.G. Harris, and A.P. Krumhardt, 1996-98; conodont analyses by A.G. Harris and J.E. Repetski (see Harris and others, in press). Lower part Sultan Limestone, south side of roadcut at Mountain Springs Pass, NE1/4 SE1/4 sec. 19, T. 22 S., R. 58 E., Mountain Springs 7.5-min. quadrangle, measured, described, and sampled by A.G. Harris and A.P. Krumhardt, 1997; conodont analyses by A.G. Harris. Thickness of Crystal Pass Limestone Member from Langenheim and Webster (1979) and of formations in Monte Cristo Group as well as conodont age near top of Bullion Limestone from Stevens and others (1996)

K. patula Zone

Pt. celloni or Pt. amorpho- gnathoides Zone

Pt. celloni Zone

up. H. sinuosa

or H. holodentata

H. sinuosa Zone?

H. sinuosa ZoneH. altifrons Zone

A. deltatusO. costatus Zone

M. dianae Zone

"Low diversity" interval

R. manitouensis Zone

C. minutus Subzone

Eoconodontus Zone

GUILMETTE

FORMATION

LAKETOWN 

DOLOMITE

(DSu)

Sevy Dolomite equiv.

ELY SPRINGS

DOLOMITE (Oes)

SIMONSON

DOLOMITE (Dsi)

ANTELOPE

VALLEY

LIMESTONE

GOODWIN

LIMESTONE

NOPAH

FORMATION

(part)

(n)

YELLOWPINE LS.

BULLION LS.

DAWN LS.

NARROW

CANYON FM.

EUREKA

QUARTZITE (Oe)

INDIAN SPRINGS FM.

(PMb, pt,)

BATTLESHIP

WASH FM.

YELLOWPINE

LIMESTONE

BULLION

LIMESTONE 

ANCHOR

LIMESTONE

DAWN

LIMESTONE 

GUILMETTE(?) FORMATION

GUILMETTE

FORMATION

late Chesterian (Webster, 1969)

Rh. nevadensis Zone (Webster, 1969)

late Meramecian

Sc. anchoralis-

 D. latus Zone

early-middle Osageanlatest Famennian-

 earliest Osagean

Lower Cavusgnathus Zone

G. homopunctatus- Upper

G. texanus Zone

Po. mehli-Lower

G. texanus Zone

Sc. anchoralis- D. latus Zone

late Kinderhookian

middle Kinderhookian

Up. Pa. crepidaUp. Pa. postera Zones

Stringocephalus sp.

H. holodentata-Ph.

H. holodentata Zone

polonicus Zones

"Low diversity" to M.

dianae Zones

C. proavus to C.

intermedius Zones

uppermost

Eifelian-Givetian

F?

mid. Eden.-mid. Mays.

H. holodentata Zone

H. sinuosaH. holodentata

 Zones

T. laevis-lower

H. altifrons Zones

BULLION LS.

ANCHOR LS.

DAWN LS.

BULLION LS.

YELLOWPINE LS.

ANCHOR LS.

DAWN LS.

CRYSTAL PASS

LS. MBR.

VALENTINE

AND

IRONSIDE

MEMBERS

CRYSTAL PASS

LS. MBR.

VALENTINE

AND

IRONSIDE

MEMBERS

Sc. anchoralis-

 D. latus Zone

Si. praesulcata to

Si. sulcata Zones

Lower(?) Si. praesulcata

 Zone 

Cl. elongatus

Subzone of Co. proavus Zone

GUILMETTE

FORMATION

SIMONSON DOLOMITE

ELY SPRINGS

DOLOMITE (Oes)

EUREKA

QUARTZITE

(Oe)

POGONIP

GROUP

(Op)

Po. mehli- Lower G. texanus Zone

T. australus-Po. ensensis Zones

T. australus-T. kockelianus Zones

Po. c. costatus-T. kockelianus Zones

Eifelian

mid. Eden.-mid. Mays.

low. O. communis Zone

O. costatus-A. deltatus Zone

R. manitouensis Zone

CAMBRIAN

(part)

ORDOVICIAN

SILURIAN

DEVONIAN

(part)

MISSISSIPPIAN

(part)

MISS. AND DEVONIAN

ROCKS, UNDIV. (MDu)

GIV. FAM. KIND. OSAGEAN

MONTE CRISTO

GROUP (Mm)

MISS. AND DEVONIAN

ROCKS, UNDIV. (MDu)

OSAGEAN

MONTE CRISTO GROUP

(Mm)

FAMENNIAN

KIND.

MERA. CHES.

LLANDOV.

LOWER MID U MID

MISS. AND DEVONIAN

ROCKS, UNDIV. (MDu)

MISS. LOW

FAM. KIND CRYSTAL PASS LIMESTONE

Du

LOW U

LOW U MID UPPER LOWER (part)

FAM. KIND. OSAGEAN

MTN. SPRINGS FM. (DOm) MISS. AND DEVONIAN

ROCKS UNDIV. (MDu)

MONTE CRISTO

GROUP (Mm)

SULTAN LS.

MISS. AND DEVONIAN

ROCKS UNDIV. (MDu)

SULTAN LS.

LOWER U MIDDLE

KIND. OSAGEAN EIFEL.

L

POGONIP GROUP (Op)

U

(pt.)

SIMONSON

DOLOMITE equiv. SIMONSON DOLOMITE equiv.

Ely Springs Dolomite

equiv.

Ely Springs

Dolomite equiv.

MTN. SPRINGS FM. (DOm)

INNER MIOGEOCLINE 

Re. andinus Zone

 Re. andinus Zone

Re. andinus

Zone

Re. andinus Zone

ANCHOR

LIMESTONE

Sevy Dolomite equivalent

Base of Ely Springs Dolomite

LOW

DEVONIAN

(part)

MISSISSIPPIAN

(part)

CAMBRIAN

(part) ORDOVICIAN DEVONIAN

(part)

CAMBRIAN

(part)

ORDOVICIAN

ORDOVICIAN

DEVONIAN

(part)

MISSISSIPPIAN (part)

CAMBRIAN

(part)

DEVONIAN

(part)

MISSISSIPPIAN

(part)

LOWER LOWER (part) UPPER (part) MIDDLE UPPER LOWER MIDDLE UPPER (part) 

LOWER (part) UPPER (part) UPPER (pt)

UPPER UPPER (part) 

UPPER (part) 

UPPER

(part) 

NOPAH

FORMATION

(part)

(n)

POGONIP

GROUP

equiv

POGONIP

GROUP

equiv

NOPAH

FORMATION

(part)

(n)

NOPAH

FORMATION

(part)

(n)

MONTE CRISTO

GROUP (Mm)

1. Columns, from left to right, indicate system, series and stage (if latter is determined), and map unit (letter symbol).2. Tie line for sections is base of Ely Springs Dolomite which represents a relatively rapid transgression.3. General westward increase in thickness of the Re. andinus Zone reflects general 

westward increase in thickness of most stratigraphic units in these sections.4. A lithologic column for each section and analyses of all conodont collections (including species identification and relative 

EXPLANATION

abundance, conodont color alteration index, and biofacies) are given in Harris and others (in press).5. Abbreviations: Eden., Edenian; Maysvil., 

Maysvillian; Llandov., Llandoverian; 

Wen., 

Wenlockian; Giv., Givetian; Eifel., Eifelian;Fam., Famennian; Kind., Kinderhookian; 

Mera., Meramecian; Ches., Chesterian; F, fault. Conodont collection; age of diagnostic collection given at right of column

Biostratigraphically diagnostic brachiopod identification 

See figure 3a for geographic and tectonic position of sections; all sections are 

composite; sources given below column

O

p

O

p

O

p

n n

n

n

n

bk

bk

PMb

Mm

Mm Mm

Mm

MDu

MDu

MDu

MDu

MDu Mm

QTu

QTu QTu QTu QTu

QTu

Oe

Du

DOm

DOm

pre-

bk pre-

bk

Oes

Ja

Jkc

Pkt

Pkt

Pr

Pr

Pr

Pr

Pkt Pkt

Pkt

Lee

Canyon

thrust

Deer

Creek

thrust

Kyle

Canyon

thrust

Keystone

thrust

Bird Spring

thrust

C'

PMb PMb

PMb

PMb PMb

PMb

PMb



m



m

BEND IN

SECTION

BEND IN

SECTION

BEND IN

SECTION

?

?

?

0 (Sea level)

1000

200030004000

-1000

METERS

QTu QTu

QTu

Du

DOm

MDu

Mm

DOm

bk

bk

bk

Mm

DSu

Pbu

DSu

MDu

QTu

Oe

Oe

Oe

1000

2000

METERS

3000

0 0 (Sea level)

1000

2000

3000

METERS

B B'

Las Vegas Range

Valley thrust

Sheep Range

Mormon

Pass

fault

FossilRidge Gass Peak

Gass Spring thrust

fault

FossilRidge

fault

Mm

Yucca

Forest

fault

-1000-2000

-1000-2000

Zw

Zw

Zw

bk

bk

bk

bk

n

c

c

n

n

n

Pbu Mm

Mm

MDu

MDu

Oe

Oe Oes

Oes

QTu

O

p

O

p O

p

O

p

O

p

O

p

Oes

DSu

DSu

DSu

MDu QTu QTu

Zs

Zs

PMbl

PMbl

Mm

PMbl

Oes

Oes

Dsi

O

p

QUATERNARY AND TERTIARY ROCKS

Gravelly alluvium, predominantly of alluvial fans

Young fan alluvium (Holocene and latest Pleistocene)Youngest alluvium (Holocene) Older young alluvium (Holocene and latest Pleistocene) Younger intermediate fan alluvium (late Pleistocene) Intermediate fan alluvium (late and middle? Pleistocene) Undivided young and intermediate alluvium (Holocene and late Pleistocene)Old alluvium (Pleistocene) Undivided Pleistocene alluviumGravelly basin-fill alluvium (Pleistocene to late Miocene?)

Footslope colluvium and alluvium

Hillslope colluvium and alluvium (Holocene and Pleistocene)

Fine-grained deposits

Dune sand (late Holocene) Modern playa sediment (late Holocene) Youngest spring deposits (late Holocene) Intermittently active fluvial fine-grained alluvium (late Holocene) Older fine-grained deposits (Holocene) Unit E—Young fine-grained deposits associated with past ground-water 

discharge (early Holocene to latest Pleistocene) 

Undivided young spring deposits (Holocene and late Pleistocene)Units C and D—Intermediate fine-grained deposits associated with past 

ground-water discharge (late Pleistocene) 

Undivided young and intermediate fine-grained deposits associated with past 

ground-water discharge (early Holocene and late Pleistocene) 

Units A and B—Older fine-grained deposits (late? to middle Pleistocene) Old fine-grained spring deposits (middle Pleistocene)Basin fill of Browns Spring (Pleistocene and Pliocene?) 

Upper part (middle Pleistocene) Middle white limestone (middle Pleistocene) Lower part (middle and early? Pleistocene to Pliocene?) 

Fine-grained sediments of Whitney Mesa (middle Pleistocene) Undivided fine-grained sediments of the Las Vegas Valley (Quaternary and 

Tertiary?) 

Undifferentiated fan alluvium and basin-fill deposits (Quaternary to Miocene?) 

Basin-fill deposits

Muddy Creek Formation (Pliocene and upper Miocene) Horse Spring Formation, undivided (Miocene and Oligocene)Basalt unit of Horse Spring Formation (Miocene)

Qay

Qayy 

Qayo 

Qaiy 

Qai 

Qau

Qao Qaoi

QTa

Qcf

Qd 

Qpy 

Qsyy 

Qfy 

Qfo 

Qse 

Qsy

Qscd 

Qsu 

Qsab 

Qso 

Qby 

Qbw 

QTbo 

Qfw 

QTs 

QTu 

Tm 

Th

Thb

Volcanic rocks

Mount Davis Volcanics (Miocene) Patsy Mine Volcanics (Miocene) 

MESOZOIC, PALEOZOIC, AND PROTEROZOIC ROCKS

Aztec Sandstone (Jurassic) Kayenta Formation (Lower Jurassic), Moenave Formation (Lower Jurassic), 

and Chinle Formation (Upper Triassic), undivided

Moenkopi Formation (Middle? and Lower Triassic) 

Moenkopi Formation, undivided (Middle? and Lower Triassic)Upper red member (Middle? and Lower Triassic)Lower unit (Lower Triassic)

Kaibab and Toroweap Formations, undivided (Lower Permian) Lower Permian redbedsCallville Limestone (Permian, Pennsylvanian, and Mississippian)Bird Spring Formation (Lower Permian to Upper Mississippian)

Upper member (Leonardian and uppermost Wolfcampian)Lower member (upper Wolfcampian to Chesterian)

Bird Spring Formation, undivided (Lower Permian to Upper Mississippian)Monte Cristo Group (Upper and Lower Mississippian) Mississippian and Devonian rocks, undivided (Lower Mississippian and Upper 

and Middle Devonian)

Simonson Dolomite (Middle Devonian) Devonian rocks, undivided (Middle and Lower Devonian)Devonian and Silurian rocks undivided (Lower Devonian and Lower Silurian)Mountain Springs Formation (Middle Devonian, Upper Ordovician, and 

Lower Ordovician)

Ely Springs Dolomite (Upper Ordovician) Eureka Quartzite (Middle Ordovician)Pogonip Group (Middle Ordovician to Upper Cambrian)Nopah Formation (Upper Cambrian) Bonanza King Formation (Upper and Middle Cambrian) Carrara Formation (Middle and Lower Cambrian) Bright Angel Shale (Middle and Lower Cambrian) Tapeats Sandstone (Lower Cambrian) Wood Canyon Formation (Lower Cambrian and Late Proterozoic) Stirling Quartzite (Late Proterozoic) Johnnie Formation (Late Proterozoic) Gneiss (Early Proterozoic)

Tmd Tpm 

Ja 

Jkc



m

mu

ml

Pkt 

Pr

PMc

Pbu

PMbl

PMbMm 

MDu

Dsi 

Du

DSu

DOm

Oes 

Oe

O

p

n 

bk 

c 

b 

t 

Zw 

Zs 

Zj 

Xg

LIST OF MAP UNITS

[Detailed descriptions of map units are in the accompanying pamphlet.]

Bedrock geology mapped and compiled by William R. Pageand surficial geology mapped and compiled by Scott C. Lundstromin 1995–99. (See fig. 1 for sources of geologic map data.)GIS map database compiled by D. Paco VanSistine, Jeremiah B.Workman, Karen S. Morgan, Elijah C. Kempton, Owen D. Young,and Esther Castellanos

Edited by Craig BrunsteinDigital map layout and cartography by Gayle M. DumonceauxColor and pattern selections on geologic map by Bill SowersManuscript approved for publication, January 12, 2004Any use of trade names in this publication is fordescriptive purposes only and does not implyendorsement by the U.S. Geological SurveyPDF and GIS files of this publication are available athttp://cpg.cr.usgs.gov/pub/sim.htmlFor sale by U.S. Geological Survey Information ServicesBox 25286, Federal Center, Denver, CO 80225

GEOLOGIC AND GEOPHYSICAL MAPS OF THE LAS VEGAS 30

′

× 60

′ QUADRANGLE, CLARK AND NYE COUNTIES, NEVADA, AND INYO COUNTY, CALIFORNIA

By

William R. Page,

1 Scott C. Lundstrom,

1 Anita G. Harris,

1 Victoria E. Langenheim,

2 Jeremiah B. Workman,

1 Shannon A. Mahan,

1

James B. Paces,

1 Gary L. Dixon,3 Peter D. Rowley,

4 B.C. Burchfiel,

5 John W. Bell,

6 and Eugene I. Smith

7

2005

CONTOUR INTERVAL 50 METERS

NATIONAL GEODETIC VERTICAL DATUM OF 1929

1 012 4 3 56 789 10 KILOMETERS

SCALE 1:100 000

1 0 1 234567 8 MILES

1U.S. Geological Survey, Denver, CO2U.S. Geological Survey, Menlo Park, CA3Southwest Geology, Inc., Blackfoot, ID4Geologic Mapping, Inc., New Harmony, UT5Massachussetts Institute of Technology, Cambridge, MA6Nevada Bureau of Mines and Geology, Reno, NV7University of Nevada, Las Vegas, NV

Prepared in cooperation with the

SOUTHERN NEVADA WATER AUTHORITY

NEVADA

MAP LOCATION

MAP A. GEOLOGIC MAP

SCIENTIFIC INVESTIGATIONS MAP 2814

Pamphlet accompanies map

SHEET 1 OF 2

Contact—Dashed where approximately located.

Hachure with number indicates dip direction anddip angle of contact

Strike and dip of bedding

Inclined beddingVertical beddingOverturned beddingHorizontal bedding

Inclined foliationHigh-angle faults

High-angle normal fault—Dashed where approximately

located, dotted where concealed. Ball and bar ondownthrown side. Arrow and number show directionand amount of dip. Queried where inferred

Oblique-slip and (or) strike-slip fault—Dashed where

approximately located, dotted where concealed. Ball and baron downthrown side. Arrows show relative direction oflateral offset. Queried where inferred 

EXPLANATION

40

10

75

22

75

20

45

Low-angle fault—Slip surface at base of gravity-slide

masses and low-angle normal faults; dashed whereapproximately located, dotted where concealed.Hachures on upper plate. Arrow and number showdirection and amount of dip. Queried where inferred

Thrust fault—Includes reverse faults; sawteeth on upper

plate; dashed where approximately located, dotted whereconcealed. Arrow and number show direction and amountof dip. Queried where inferred

Geophysically inferred fault strands of the Las Vegas Valley

shear zone and State Line fault zone—Ball and bar ondownthrown side. Arrows show relative direction oflateral offset

Anticline—Showing axis and direction of plunge; dashed

where approximately located, dotted where concealed

Syncline—Showing axis and direction of plunge; dashed

where approximately located, dotted where concealed

Overturned anticline—Showing axis and direction of plunge;

dashed where approximately located, dotted where concealed

Overturned syncline—Showing axis and direction of plunge;

dashed where approximately located, dotted where concealed

Monocline—Showing axis; dashed where approximately

located. Arrow indicates dip direction of steep limb

Sample locality for thermoluminescence data (table 1 in 

pamphlet) and for uranium-series data (table 2 inpamphlet)

LV-1

QUATERNARY

late

early

late 

middle

early

Holocene

PleistocenePliocene

MioceneOligocene

TERTIARY

Upper TriassicMiddle Triassic

Lower Triassic

JURASSIC

TRIASSIC

PENNSYLVANIAN

MISSISSIPPIANPERMIANDEVONIANSILURIANORDOVICIANCAMBRIAN

PROTEROZOIC

Lower Permian

Upper to Lower

Pennsylvanian

Upper to Lower

Mississippian

Upper to Middle

Devonian

Lower Devonian

Lower Silurian

Upper Ordovician

Middle Ordovician

Lower OrdovicianUpper Cambrian Middle Cambrian Lower Cambrian 

Late Proterozoic

Early Proterozoic

Disconformity

Unconformity

Unconformity

FOOTSLOPE COLLUVIUM

AND ALLUVIUM

GRAVELLY ALLUVIUM,

PREDOMINANTLY FANS

NORTHWEST SPRING

MOUNTAINS

AND SOUTHERN SHEEP

RANGE

Disconformity

Oe

Zs

Zj

Mm

MDu

Dsi

DSu

Oes

Qaiy

Qai

Qao

Qau

Qay

Qayy

Qayo

Qaoi

QTa

Qcf

Tmd

Tpm

FINE-GRAINED DEPOSITS

CORRELATION OF MAP UNITS

VOLCANIC

ROCKS

?

Dune sand

Qd Qpy

Qsu

Qse

Qscd

Qsab

Qsy

Qsyy Qfy

Qfo

QTs

Qso

Qby

Qbw

QTbo

Qfw

Map units associated with past

ground-water discharge indicated with asterisk (*)

TERTIARY

BASIN-FILL

DEPOSITS

Tm

Thb

Th

QTu

??

?

?

?

Disconformity

Disconformity

LAS VEGAS

RANGE

Pbu

Mm

MDu

PMb PMbl

CENTRAL SPRING

MOUNTAINS

Disconformity





Du

Du

Du







p



 	

Disconformity

Unconformity

Unconformity

Unconformity

Unconformity

Disconformity

Unconformity

Disconformity

EASTERN SPRING

MOUNTAINS

Mm

MDu

Pr

Pkt

Ja

n

bk

n

bk

PMb

DOm

DOmDOmDOm



m

mu

ml

Jkc

Unconformity

Unconformity

Disconformity

Disconformity

FRENCHMAN

MOUNTAIN

Disconformity

Mm

MDu

Pr

Pkt

Xg

n

bk

b

t

PMc

O

p

n

bk

c

Zw

* *

* *

*

*

*

*

**