Nbmg Map Of035_rev

Prepared as part of the STATEMAP component of the National Cooperative Geologic Mapping Program in cooperation with the U.S. Geological Survey and with support from the Bureau of Land Management through the Southern Nevada Public Land Management Act (SNPLMA)

NEVADA BUREAU OF MINES AND GEOLOGY

114°40'0"W 3903 000m. N

713000m. E

14

114°37'30"W 16

15

17

18

720 114°35'0"W

19

21

Qai

66

88

Tgs

Xgn

Tgs

90 Tgs

75

72

67

Tgs

16 Tgs 46

2 35

Tgs

48

65

69

73 57 37

51

Tgs

19

56 40 Tgs 32

Tgs

01

58

52

44

53

Tgs

Tgs 23 42

79

48

Qaa

73

3900

Qai

35 Tgs

62

Tdi

Tgs

Qai

Tgs

Tgs

60 63 Td

Ts

52

Qay

Qai

56

65

27

99

Qai

Qaa

41 Ta

43

55 Xgn

Ta Qai

Qai

Qaa

73

18 60

31

Ydg

Xgn

Td

Ta 33

25

Ta

Qai 76 29

25

47 48

40 43 Ts 75

64 51 72 73

Ydg

Ydg9 61

19

80 18

71

32

72

57 80

55

39

83

Ydg

54 59 42 Ydg 13 Tbay 40 45

Qai Qai

Tc 8

5

Ydg

33

Qai

64

Qai

Qai

Qai1

Qai

96

72

51 63

Ydg 55 56 Ydg

50

Ydg

Ydg

Qay

Qchm

46

42

64

Qai1

67

60

69 78

70 49

73

45

42 Tp Tdo

54

49

Ydg 62 44

Ydg 45

23 16

Qai2

30

Qai2

26 17

22

23 27

Tp

Tdb

Tvbr

Dacite breccia; Volcanic breccia

Qcts

Late Pleistocene terrace gravel and sand of the Colorado River

Tp

Peach Springs Tuff

Qce

Older late Pleistocene terrace gravels, sand, and minor mud of the Colorado River (Emerald alluvium of House et al., 2005).

Tst

Tuffaceous sedimentary rocks

Qch

Late Pleistocene gravel, sand, and mud of the Colorado River (Chemehuevi beds of House et al., 2005)

Tdo

Dacite lavas

Qchs

Sand-dominated facies of the Chemehuevi beds ('upper sands' of House et al., 2005)

Tts1

Qchm

Mud-dominated facies of the Chemehuevi beds ('lower muds' of House et al., 2005)

Tcc

Qchg

Basal, gravel-dominated facies of the Chemehuevi beds

Trl

Trl

QTa/Tfb

QTa

5 Qay 10

2

Basal, local-gravel dominated facies of the Bullhead alluvium

Tbi

Basalt and basaltic andesite dikes

Tbo

Early Pliocene lacustrine mud and sand (Bouse Formation of Metzger, 1968).

Tbsc

Scoriaceous basalt related to Tbi

Tpg

Late Miocene boulder conglomerate (Pyramid gravel of House et al., 2005)

Tri

Tbri

Tng

Late Miocene channel gravels (Newberry paleochannel gravel of House et al., 2008)

Trib

Boitite rhyolite dikes

Tai

Andesite dikes

Trdi

Rhyodacite dikes

Tdi

Diorite dikes

Tgdi

Porphyritic biotite granodiorite dikes

Tcv

Calcite veins

Tqv

Quartz veins

Tgm

Mirage Pluton

Tgs

Spirit Mountain pluton

Tgu

Tgs and lesser Xgn undifferentiated

Ydb

Pegmatite dikes and pods

Tfn

Qai2

QTa

8

5

Tcv

Tqv

QTa

Tfb

Vein, emplaced along fault Showing dip

10

Qai2 Qai2

95

QTa/Tfb

Qay

Tfb

Tcb

25

Qai2

QTa

Qay

60

Tfb

Qaa

Qai2 Qay Qay Qai2

Qai3

QTa

Qai2 Qay

Qai3 QTa

Qx Qay

Qai3

Qai2

Tfb

Tcb

Tfb

Tcb

93 5

Qcts

Qai2

Inclined minor antiform, showing bearing and plunge of hingeline.

Tcb

Tcb

Qai2

Qcts

Vertical

Qai2 Qay

Qai3

Qx

Qai2

Horizontal

Stipple pattern indicates areas of significant disturbance due to agricultural, residential, commercial, or industrial development.

Tfb Qai2

Qay

Tcb Qaa Qx

Biotite schist

Qai2

Qcy1

Qai1

Xs

Folds

Qay

Qx Qay

Gneiss

Vertical

Inclined

2

Qai2

Qaa

Xgn

Vertical

Inclined

Qai2

94 Qai1

Megacrystic Davis Dam granite

Strike and dip of joints 35°10'0"N

Qchm

Qai2

Qay

Ydg

Strike and dip of metamorphic foliation; arrow shows trend of stretching lineation.

QTa

80

Qchm Qai1

Finer-grained felsic phase of Davis Dam granite

Metzger, D.G., 1968, The Bouse Formation (Pliocene) of the Parker-Blythe-Cibola area, Arizona and California: U.S. Geological Survey Professional Paper 600-D, p. D126-D136.

Inclined

Qai2

Qcy2

Ydgf

Strike and dip of flow bands in lava or intrusion

Qai2 Tcb

Qx

Granitic dikes

House, P.K., Pearthree, P.A., Howard, K.A., Bell, J.W., Perkins, M.E., Faulds, J.E., and Brock, A.L., 2005, Birth of the lower Colorado River: Stratigraphic and geomorphic evidence for its inception near the conjunction of Nevada, Arizona, and California, in Pederson, J., and Dehler, C.M., eds., Interior Western United States: Geological Society of America Field Guide 6, p. 357-387.

Inclined

QTa

Qaa

Qai2

Ygi

Tfb

Tcb Qai2

Qch

Overturned

55

Qay

Tfb

Qai2

Qch?

Aplite dikes

Strike and dip of compact foliation in ash-flow tuff

QTa/Tfb

Tfb

87

Inclined

Qai2

Qai2

Qcr

Yap

House, P.K., Pearthree, P.A., and Perkins, M.D., 2008, Stratigraphic evidence for the role of lakespillover in the birth of the lower Colorado River in southern Nevada and western Arizona, in Reheis, M.C., Hershler, R., and Miller, D.M., eds., Late Cenozoic Drainage History of the Southwestern Great Basin and Lower Colorado River Region: Geologic and Biologic Perspectives: Geological Society of America Special Paper 439, p. 333-351.

61

QTa

Qai3

Tcbl?

Mylonitized Davis Dam granite

References

Tfb Qchm

Tcb

Ymy

Moderately to steeply dipping normal fault showing dip Solid where certain and location accurate, long- dashed where approximate, short-dashed where inferred, dotted where concealed; ball on downthrown side; showing strike and dip of fault plane and trend of fault striae.

Vein

Qchm

Qai2

Qai1

Qay

Diabase dikes

61

Qai2

96

Qchm

Qcy

Qchg

YTpg

QTa

Tfb

Qai2

Tfb

5

Rhyolite dikes; Rhyolite dike breccia

Gently dipping normal fault showing dip Solid where certain and location accurate, long- dashed where approximate, short-dashed where inferred, dotted where concealed; hachures on downthrown side.

2

Qchs

Tfn

Tcat

Arkosic conglomerate; Nonwelded tuff and tuffaceous sedimenta

Tcbl

35

Trl

Tfb

Tfb

Qchm

Basaltic andesite lavas

Tca

Lithologic contact Solid where certain and location accurate, long-dashed where approximate, short dashes indicate approximate contact interpreted from aerial photo, dotted where concealed. 97

Tfb

Tuff of Cook Canyon

Early Pliocene alluvium of the Colorado River (Bullhead alluvium of House et al., 2005)

18

15

4

22

Tuffaceous rocks; Volcanic breccia

Tcb

Symbology (per FGDC-STD-013-2006)

Trl

Tdo

Tbao

98

3

QTa/Tfb

Tvbr

31

Qaa

30

Qai1

Qcts Qai1

QTa QTa

Qai3 Tfn1

Qay

Qai2

Qai2 Qai2

92

Holocene alluvium of the Colorado River

Basaltic andesite lavas

33

Qai2

Qaa

Qcy1

18

Tp 17 7

Qchm

Qai1

Andesite lavas; Basaltic andesite lavas

Tfb

Tfp

Qai

Qai1

Tba

99

Tdo

Qai

Qay

26 27

Qchm

Qai1

Tgu

Ta

21 Tdo

Tdo

33

Tp 29 Tcc

5

Qch

Qai2

93

Recent (post-dam) alluvium of the Colorado River

33

Tdo

49

Tdo

Qai2

Tfb

Tfp

Qai1

Qai

Qcy2

Ryolite lavas; Ryolite breccia

35°12'30"N

2 Qaa

Qchm

Tcc

26

QTa/Tfb

24

25

23

Tfb

Tca

Tdo

30 Tcc Tdo

18

30

5

Tcc 19 23

24

58

Tp 20

Tfb

20

18

Tp

Qaa 65

11

15

35 Qai2

Tfb

Tp 23

29 35

QTa/Tfb

Tri

80

Qchg

Qai2

35°10'0"N

Dacite lavas

24

36

24 33

22 Tdo

26

84

19 26

23

67

Qai

25

26 78

75

Tri

Tai

38 Tri

Ydg

Tai

29

66

65 55

47

35 31

26

51 25

Qai

Ydg

Ydg

53

Ydg

Tcb

Qai3

Qe

94

Td

76

Tri 15

59

20

41 80 21 40

Tcc 45

73

48

11

22

Tai 28

16

68

Tri

Ydg

54

65

63

29

34

56

77

80

Ydg 2

Qaa Qai1

Qai1

Qai

Holocene alluvium of the Colorado River

37 Tai

5

Qaa

Tgu

Qcy

Strike and dip of bedding Qai1

Qaa

Tca 20

73

Qaa 50

Qai2

Qai2

Qai1

Qai1

Tuffaceous rocks

Tri 75 Tai 21 Tri

21 14 Tri 22

43

Ydg

81

57

15

27 30

42

70

Tfb

Qai1

Qai1

Tts

Tbr

25

Qai

Tri 9 76 Tca

37

37

55

Ydg

65

Tcb

90

Qay

Qai1

Pliocene to Miocene fanglomerate of the Pyramid hills

Tri 56 35

Tri 24

46

40 Tri Tri

Tri

Basaltic andesite megabreccia

Tfp

61

22 65 55

Tri

Ydg

Tai

90 Ydg 34

61

48 87

59

Ydg

59

Ydg 70

51 Ydg

Ydg

43

Ydg

62

60 79

81

82

45 Tri

90

70

28 41

Qai

63

Tfp

Qx

Tgu

95

Ydg

90

63

Ydg

Ydg 22 69 44 32

Tri 70

83

Ydg 57

Tbb

Tbay

39 00

51 61

77

Ydg

Qai

Qai Tgu

46

77 86 47

52 79

58 72

79

53 65

78

Qai

23

35

33

83

54 47

57

Tpg?

Qchs

Qay

Ydg

58

Ydg 39

Tfn

Qai

47 67

Ydg

55 69

80

75

55 61

Ydg

47

Ydg

47

62

73

66

64

Ydg

Qchs

85

Qai1

81

43

79

Ydg

83

Conglomerate and sandstone

78

69

Ydg 67

Ts

Pliocene to Miocene fanglomerate of the Black Mountains

Ydg

74 Ydg

32 67

77

61

64 Ydg

37

37

Ydg

49

Tcb

Qai

Qai

Ydg

Ydg Ydg

80

Qai1 Qai

Ydg

32

22

90

67

Ydg

69

Conglomerate megabreccia

80

87

Ydg

42

Ydg

51

70

Qaa

42 52 47 57

Ydg

76

80 Ydg

Pliocene to Miocene fanglomerate of the Newberry Mountains

Tbca

Tfb

65 69

79

Ydg

69

Ydg

Ydg

Ydg

Ydg

43 Ydg

53

50 Ydg

Ydg

Qai Qchm

Qai

Qcy

Tuff megabreccia

Trl

Ydg

Ydg

65

52

37

32

60

Ydg

Ydg

59

48

Ydg 35

Ydg

39

Ydg

75

79 73

41

74

Tpg?

Ydg

66

63

60 Ydg 42 61

52 40

75

77

47 71 Ydg 50 73 57

55

77 90

58

Qai1

Qai1

62

Ydg 53

49

25

57

39

Qai

Ydg

47 58 46 62

Qai 13

Tri

Qai

61

13

68

7

Qai1

Qai

Qai3 76

40

84 41

43 Ydg

Tfb

23

36

34

53

Qai

65

46

79

60

20

70

63

Ydg 47 35

57

77

45

Qaa Qxd

26

Ydg 45 71

31 53

57

Ydg 61 44 90

42 Ydg

49

69

Ydg 58

Qai

30

Ydg 70

40 Ydg

Ydg 72

Ydg 52 49 59 Ydg 67 57 30 Ydg

46

52 33 51 Ydg

5364

Ydg

73

79 40

57

76

47

38

73 79

43

55 Ydg 76 61 Qai3 87 60

57

Ydg 43

42 53

42

74

QTa

35

Qai

60 55 Ydg 35 66 67

50 41 32

66 64

Ydg 15

49

30

Ydg

Ydg

Qai

36

Ydg 62

67

61

57 Ydg

Ydg

46

Ydg

66

44

Ydg

45 62

34 43

29

54

73

Ydg

37 49 41 75

Tbay

4

Ydg

50 45

78

87 70

Ydg

57 35

85

55

Ydg

Ydg

77

25

41 41

59

50

Ydg

48 49 43

44

64 50 44

Ydg

58

58

59

41

37

43

63 43 62

37

Qchs

Tbt

Late Miocene fanglomerate of the Newberry Mountains

Qai3

Ydg

Ydg

Ydg

60 55

68

75

43

63

61

44

64 42

58

51

Ydg 66

80 Tc

50

60

59

Ydg

13

45

55

57 49

62

62

43

Ydg

57

37

85 Ydg 70 56

73 65 67

Ydg

51

40

44 Ydg 59

Oldest late to middle Pleistocene piedmont alluvium

83

82 73

Ydg Ydg

57

Ydg 47 49 Ydg 45 53

Ydg

69 79

Ydg

55

Ydg

Ydg

59 64

77

69

65

53

39

Qai 11 Tc

46 Ydg

Ydg

53

Ydg 78 61

79 81 64 80

Ydg 85

66

30

80

47

Ydg

Ydg 59 90 74 Ydg 43 84

Ydg

15

Ydg 79 65

31 Ydg

80

53 Ydg

65

Ydg

79

58

77 74

58

47

Qai1

Tfn1

01

Ydg 72

75

67

23

77

78

48

69

55 79

Qchs

85

Ydg

Ydg

Ydg

84

Qai

80

59

51 Ydg 76

Ydg

Ydg

59 65 70

Qcts

71

45 55 Ydg 82 70 81 59 62 Ydg 59

Qai

70

Ydg 45 59 Ydg

Ydg

68

Qai

Ydg 58

83 75 40

81

88 Ydg

Qai

69

84

31

50 37

53

Tc

Tc

15

49 85

52

Qai

Tgu

22 76 69

20Ydg

40

Qai

77

70

Ydg

75

76 86 67 70 79

Qchm

71

Tts

8

Qai

81

Ydg

62

64 70

Qai3

Tc

Qai

Qaa

67

11 11

42

70

Ydg

Qai

Tc

70 73

71

80 66 Ydg 27 60 90 Ydg

73

83

Ydg 72

86

Ydg

65

73

57

Ydg

Tbay

Tc 16

Qai

54

Ydg

51

48

17

10

Ts Tc

Qay 75 60

Qai Tgu

85

59

50

57

Tc 15

Ts 19

37 39

Qai

Ydg

49

15 15

55

54

45 24

Ta

68 Tca 52

65

7 Tc

32

31 55

11

Ts 30

62

10 Tgu 16

20 78 44 53 54

41

58

10 Ts

Qai 33

54

Tc

84

90 83

Qai

69

Qai

72

90

64

85 84

59

Ydg 63 Ydg 70 57

82

Ydg 65 Ydg

Qai3

Qchs

Qay 58

66 60

Dacite megabreccia

Pliocene fanglomerate of the Newberry Mountains

Ydg

77

Ydg

61

39

40 9

67 60

77 Ydg

83 Qchm

41

64

Ydg

42

56

41 13 26 45

8

48 25

Qai

10

9

8

79

97

Tc

26 56

Qai

62

77

86

79

39

Tp 57 55

33

75 Qai

19

17

68 54

Qaa

Tp 70 44

18

28 Qaa 16

59 Tc 23

69

51 23 13 39 54 26

44 Qay Tc 32

Tc

Ts

43

53

Tri

Ts

Ydg

Qai

35°12'30"N

55 43

27 87 Ydg

5

12

81

Ydg

Tbd

Tfn2

Qai3

69 82

80

Ydg

67

Older late Pleistocene piedmont alluvium

Qai3

Ydg

Qai3 80

80

Qai2

02

Ydg 80

Ydg

Qchm/Tfb

69

79 Ydg

59 76

Volcanic megabreccia Granitic megabreccia

Tfn

79

83

63

64

Tbv

Qai2

81

80

78

20

71 57 Qaa

68

Td

46 62 46

Tgs

64 63

52

47

75

10 28 39

9 73 90 43 35 80 84 49 Ydg 33 53

Ydg 60 73 85 70

44 71 45 40

37 Td

8481

Qai3

Ydg 85 87 77 Ydg 76 73 46 86 Ydg 86 55 77 80 Ydg 81 60 56 76

64 83

Ydg

79

61 56

29

42

53

72

60

Ta

70

67 77

58 61 29 41 61 32 71 61 38 45 45 62 78 39 61 77 49

Qai

Qai

84

Ydg

Qchs

49

77

72

76

41

51 76 46 72

80 66 79

55

Qai

Tgs

50 62

Conglomerate containing clasts of Spirit Mountain pluton

Tbg

Pleistocene to Pliocene piedmont alluvium

Qai2

50

70 46 71 Ydg

75

Pleistocene piedmont alluvium

QTa

Qai3

76

72

Qay

56 58

Qaa

Qai

58 Tgs

Tgs

67 Qai

Tgs

77

Ydg

Tc

Late Pleistocene piedmont alluvium

Qay

Qai2/Qchm

Ydg

Ydg

Qaa

Tfbr

54

30 55

Tgs

Ydg

Qai

Tgs

Tgs

Tgs

Qai

39

43 Tgs

Tgs

2

Tgs

61

76

70 90 75

Fault breccia along Newberry detachment fault

Qai3

37

Qai

Qaa

Holocene alluvium of piedmont washes and alluvial fans

56

Qxmt

58

Qaa

Ydg

41

31

Trib

QTa

Qai3

Qaa 59 Qaa 43 24 Tgs 35 Tgs

65 62

Trib

Qchm

Qai

Qaa

Qaa

Qai3

Tri

Tfb

47

54

Qai3 49

85

24

87 42

Qai2

45

Qchs

Ydg

Qai

Qay

Tfbr

41

Qai2/Qchm

65

Qai 79

Tfbr

Recent to late Holocene alluvium of active piedmont washes and alluvial fans

Qai

Qai2

Ydg

Ydg

40 72 61

18 Tgs 62 58

Qai2

Qai2

66

32

25

Qaa

Tri

Qtr Qaa

Qchm

81 Ydg

03

80

60

Tri

Qai2/Qchm

Qai

Tdi

Ydg

79

57 62

47

Qchs

Qai2 47

Qai2

Ydg

72

66

Qai2

Qai2

Qai2

33 54

74

Qai3

QTa

80

60 Qai

67 59

Qay

90

Xgn 64

45

Qai2

QTa

72

66

Tgs

114°30'0"W

27

69

74 Ydg

PRELIMINARY GEOLOGIC MAP OF THE DAVIS DAM QUADRANGLE, AND THE EASTERN PART OF THE BRIDGE CANYON QUADRANGLE, CLARK COUNTY, NEVADA, AND MOHAVE COUNTY, ARIZONA

83

37

Ydg

64

44 34

26

82

44

Xgn

42

02

25

Qai2/Qchm

80

Ydg

24

Qai2/Qchm

65

Tgs

1

3

85

81

45

76 71

28 68

Tgs

66

73

50

65

84

Qai

80 64

Qai

Qaa 75

114°32'30"W

23 87

80 61 Qai

Tgs

98

22

OPEN FILE XX-X

Qai3

Qai2

Qai2

Qai2

Qx

Qai2

Qai2

Qai3

Qai3 Qch

Qay

Qay

Tcb Qay Qai2

92

Qay

Qai1

Qx

Qx

Qai3 Tcb

Qcts

Qai2

Qai2 Qai2

Qai2

Qai3

Qai2

Qai3

Qay

Qay Qay

Qx

Qch

Qaa

QTa

Qai2

Scale 1:24,000

Qai2

QTa

91

Tfb

Qx

Qai2

Tgm

Tfb

Qch

Qay

Tcbl

Qay Qai2

Qai1

0

Qai2

Tcb

Tcbl

Qcts

Qai3

Qaa

Qai2

Tcb

Qai1

0.5

1

mile

0

Qcy

Qay

Tpg

Qch

2000

3000

4000

5000

feet

Qai2

Tcb

Qaa

1000

Qai2

Tcb

Tpg

Qai3

3890

Qai3

0

Tfb

Qch

Qai3

91

Qcy

Qai3

Qai2 Qay

Qay

Qai3 Qx

Qay

1 kilometer

QTa

Qch

Qcts

0.5

Qay

Qaa

114°40'0"W

QTa

Tfb

Qai2

Tcbl

Qay

Qai2

Qay

Qaa

QTa

Qai3

Qai2

Qay

Qaa

Qx

CONTOUR INTERVAL 40 FEET

Qay

Qai3

Qai3

Qaa

Qce

35°7'30"N 13

14

15

Qx

16

114°37'30"W

17

Qch

Qai2

Qai2

Qay

Qce

Qce

Qce

18

19

Qce

Tcb

Qaa

Qch?

Qcy

Qch

Qx Qay

Qcy

Qch?

Qchg

Qay

Qaa

Qay

Qchg

Qay

QTa Qbr

Tfb

Qai2

QTa

Qai2

QTa

Qay

38

Qay

Qay

Qce 720

114°35'0"W

Qay

Qch?

21

22

23

Qai2

QTa

Qai3

Qch

Qcy2

Tcb

Qai3

24 114°32'30"W

90000m. N

Qai3

Qai2

25

26

727000m. E

Base map: U.S. Geological Survey Davis Dam, Ariz.-Nev. 7.5' quadrangle (1981) Projection: Universal Transverse Mercator, Zone 11, North American Datum 1927 (m)

114°30'0"W

PRELIMINARY GEOLOGIC MAP OF THE DAVIS DAM QUADRANGLE, AND EASTERN PART OF THE BRIDGE CANYON QUADRANGLE, CLARK COUNTY, NEVADA, AND MOHAVE COUNTY, ARIZONA James E. Faulds, P. Kyle House, Philip A. Pearthree, John W. Bell, and Alan Ramelli 2008

Adjoining 7.5' quadrangle names

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Spirit Mountain Spirit Mountain SE Burns Springs Bridge Canyon Davis Dam Union Pass Mount Manchester Davis Dam SE Oatman

Field work done in 2000-2006 Supported by the U.S. Geological Survey STATEMAP Program (Agreement No. 99-HQ-AG-0058) and the Bureau of Land Management (Agreement No. FAA070026) DRAFT Preliminary geologic map Has not undergone office or field review Will be revised before publication Edited by Dick Meeuwig Cartography and map production in ESRI ArcGIS v9.2 (ArcGeology v1.2) by Heather Armeno, Robert Chaney, and P. Kyle House First Edition 2004, Second Edition July 2008 Printed by Nevada Bureau of Mines and Geology This map was printed on an electronic plotter directly from digital files. Dimensional calibration may vary between electronic plotters and X and Y directions on the same plotter, and paper may change size; therefore, scale and proportions may not be exact on copies of this map.

For sale by: Nevada Bureau of Mines and Geology University of Nevada, Reno / 178 Reno, Nevada 89557-0178 ph. (775) 784-6691, ext. 2 www.nbmg.unr.edu; [email protected]

1957