Cs

Cs

Cs

Qai

Qay

Qay

Qao

Qao

Qao

Qai

Om

Cs

m

m

m

m

m

Jm

Jm

Jm

Jm

Jm

Jm

Jm

Jm

Jm

Jm

Kn

Kp

Kl Kf

Kb

Jm

Pl Kd

Jmr

Pl

Pl

Kd

Jmr

KJdm

KJdm

Kb

Kb

Kn

Kb

Kn

Kd

Kb

Kp

Kp

Kp

Kp

Kp

Ksvs

Kp

Kp

Kp

Kp

Kp

Kb

Kf

Kf

Kb

Kn

Kb

Kb

Kb

Kd

Kd

Kd

Kd

Pg

Pg

Kd

Ku

Ku

Kd

Kn

Kd

Tmp

Tqp

Tqp

Tqp

Tqp

Tqp

Tmp

Tmp

Kd

Knb

Kd

Qa

Qa

Qdf

Qa

Qa

Qa

Qa

Qa

Qa

Qa

Qa

Qa Qa

Qa

Qa

Qa

Qa

Qa

Qa

Qa

Qa

Qa

Qa

Qa

Qa

Qa

Qa

YgP

YgP

YgPqg

YgPqg

YgPqg

YgPqg

YgP

YgP

YgP

YgP

YgP

YgPcp

Qa

Qa

Qa

Qa

Kn

Kf

Tsl

Tsl

Kf

Kl

Kl

Kl

QNr

QNr

YXgd

Kl

Kn

Kn

Knb

Knb

Qls

Kp

Kp

M Mlw

Pf

Pf

Pf

Mlw

Mlw

Om

Om

Pf

Pf

Pm

Pm

Pm

Pm

Pm

Pm

Pm

Pmm

Pg

Pg

Pl

Pl

QNr

Qa

Qa

Qac

Qac

Qa

Qa

Qa

Qa

Qa

Qa

Qa

Qa

Qa

Qa

Qa

Qa

Qa

Qa

Qa

Qa

Qbc

Qlo

Qlo

Qa

Qv

Qv

Qv

Qv

Qv

Qs

Qs

Qs

Qs

Qa

TKda

TKda

TKda

Qs

Qc Qs

Qa

Qa

Qac

Qac Qao

Qao

Qac

Qac

Qac

Qac

Tg

Qac

Qac

Qac

Qac

Qac

TKsr

TKsr

TKsr

TKsr

Qac

Qac

Qac

Qac

Qac

Qai

YgRf

YgRf YgRm

YgRg

YgRg

YgRp

YgRp

YgRg

Qai

Qai

Tpb

Tpb

Qai

Qai

Qai

Qai

Qai

Qai

Qai

Qai

Qai

Qai

Qao

Qao

Qao

Qao

Qao

Qao

Qao

Qao

Qao

Qao

Qao

Ta

Ta

Ta

Ta

Qpl

Qay

Qsw Qay

Qsw

Qsw

Qsw

Qsw

Tdg

Qay

Qay Qay

Qay

Qay

Qay

Qay mw

mw

mw

mw

Qay

Qay

Qay

Tsc

Tsc

Tsc

Tsc

Tsc

Tsc

Tsc

Tsc

Qay

Qay

Qay

Qc

Qc

Qc

Qc

Qtp

Qc

Qc

Qc

Qc

Qc

Qc

Qtb

Qc Qt

Qt

Qt

Qt

Qtb

Qt

Qlso Qc

Qc

Qc

Qc Ts

Tt

Qc

Qc

Qc

Qc

Qc

Qc

Qc

Qc

Qdf

Qdf

Qdf

Qdf

Qf

Qf

Qf

Qf

Qf

Qf

Qf

Qf

Qf

Qf

Qf

Qf

Qf

Qf

Qf

Qf

Qf

Qf

Qf

Qf

Qls

Qls

Qls

Qls

Qls

Qls

Qls

Qls

Qls

Qls

Qtb

Qpl

Qpl

Qpl

Qpl

Qrg

Qti

Qti

Qti

Qti

Qti

Qti

Qrg

Qrg

Qrg

Qsw

Qsw

Qsw

Qsw

Qsw

Qsw

Tsf

Twm

Qsw

Qsw

Qsw

Qsw

Qsw

Qsw

Qsw

Qsw

Ttc

Qsw

Qtp

Qtp

Qtp

Tan

Tan

Twm

Tw

Tw

Twm

Tan

Tg

Tg

Tg

Tg

Tg

Tg

Tg

Tg

Tg

Tg

Tg

Tg

Tmp

Tsf

Tsf

Tsf

Txc

Txc

Txc

Txc

Tsf

Tsf

Tsf

Tsf

Tsl

Twm

Twm

Twm

Twm

Twm

Twm

Xb

Yg

Yg

Yg

Xb

Xbh

Xbm

Xpgd

Xbm

Xbh

Xb

Xb

YXmr

YXmr

YXmr

YXmr YXmr

YXmr

YXmr

Xca

Xb

Xgg Xgg

Xb

Xb

Xb

Xb

Xqd

Xqd

Xqd

Xqd

Xqd Xb

Xb

Xb

Xb

Xb

Xh

Xh

Xbs

Xb

Xb

Xbs

Xbs

Xbs

Xbs

Xbs

Xbs

Xbs

Xf

Xbs

Xbs

Xbs

Xf

Xf

Xf

Xf

Xf

Yg Xf

Yg

Yg

Yg

Yg

Yg

Yg

Yg

Yg

Yg

Yg

YgPf

Yg

Yg

Yg

Yg

Xf

YXp

Xfh

Xfh

Xf

Xgg

Xgg

Xgg Xqg

Ka

Ka

Xgg

Xgg

Xh

Xhq

Xh

Xhc

Xqd

Xh

Xh

Xh

Xh

Xh

Xh

Xh

Xh

Xh

Xh

Xhc

Xhc

Xqg

Xqg

Xqg

Xqg

Xqg

Xqg

Xqg

Xqg

Xqg

Xqg

Xqg

Xqg

Xqg

Xqg

Xqg

YXp

YXp

YXp

YXp

YXqgm

YXqgm

YXqgm

YgPf

YgPf

YgPf

YgPf

YgPs

YgPs

YgPs

YgPfp

YgPfp

YgPfp

YgPfp

YgPf

YgPf

YgPf

YgPf

YgPf

YgPfp

Qa

Qa

Qa

Qa

A

A'

B B'

C

C'

80

78 80

55

55

55

50

50 50

70 35

80

30

60

60

80 60

65

20

80

75

75

55

80 45

60

45 60 40

60

60

60

60

45

60

60

75

75 80

75

80

80

50

35

65

65

50

50 80

70

70

70

70

82

80

70 70

70

30

20

40

70

60 60 50

65

65

50

45

45

44

30 40 70 55

55

51

54

55

52 64

54

49

80

66

80

60

45

55

55

85

45 45 50 35

50

70

70

20

25

60

44

40 40

35 27 50 60

40

25

50 60 65

70

80

65

75

55

50

40

5

35

48

36

22 75

65

80

60

50

70

75

50

80

55

55

45

50

30

45

45

60

30

76

60 60

35

45

45

40

60

60

55 50

65

65

70

35

35

80

80

80

15

20

80

30

20

70

70

70 35

15

30

70

50

30

30

25

85

40

80

35

80

50

50 30

20

22

75

80

80

80

80

55

50

55

35 45

35

30

60

60

80

55

75

35 75

50

50

70

75 75

65

76

72

72

70

65

44

80

65

65

87

30

45

45

75

20

80 70

65

35

80

45

7

75

60

80

80

70

22

80

85

60

38

70

70

65

80

55

60

60

58

88

80

75

75

84

82

80

65 80

80

60

60

33

83

68 71

75 87

34

27

54

54

40

45

55

55

50

65

45

27

34 28

27 76

38

59

46

32

35

39

39

29

53

43

69

60

81

84

44

22

60

60

64

70 80

80

65

80 80

45 70

45

50

60

30

30

40

35

25

35

60

70

30

30

40

45

45

55

45

45

45

45

35 35

30

80

40

45

45 65

30

10

60

60

80

80

65

75

45

60

30

50

60

70

40 45

45 65

65

55 65

65

80

55

80

30

50

40

50

35

35

75

45

60

80

50

75

75

60

60 80

30

85

70

70

80

80

80

25

65

65

50

35

80

55 70 70

70

30

45

50

50

40

30 45

33

70

30

10

25

25

45

45

53

30 20

15

35 35

25

25

45

35 35

30

65

80

45

65

65 70 60

20 80

65

50

80

50

85

75

35

60

55 40

60

40

50

80

65

20

45

45

40

50

25

25

40

75

59

55

80

70

60

60

87

47 52

81

87

75

55 48

40

65

35

44

85

85

75

40

68

40 50

40

45

68

70

75

40

80

45

50

75

60

5

70

5 60

50

60

60

45

60

70

75

35

50

55

60 45

75

10 25

10

10

20

5 55

65

85

35

45 65

20

50

56

30 60

40

37

30

70

35

45 35

25

43 8

40

35

40

45

30

10

40

5

15

70

60

75

75

38

35

26

23

45

69

70

60 56 27

46

68

80

67

80

36

51

61

21 31 25

51

48

55

35 44

15

66

73

61

54

59

30

25

35

20

80

31

15

20

20

33

25

38

18

29

36

36

31

40

35

44

44

20

25

25

35

30

51

81

25

28 35

15

15

15

20

55

55

50

50

44

36 35

5 39

65 25 40

75

70

40

10

60 50

26

50 30

50

40

40

27 25

15

35

25

25

55

30

30

30

30

30

60

40

49

30

40

40

25

50

50 35

35

35

35

15

34

45

65

15

20

20

10

40

29

70

30

25

25

35

15 45

10

Contact

Fault—Dashed where approximately located; dotted where

 concealed

Normal—Dotted where concealed. Bar and ball on

 downthrown side

Thrust—Dashed where approximately located, dotted where

 concealed. Sawteeth on upper plate

EXPLANATION OF MAP SYMBOLS

Strike and dip of bedding

Faults

Inclined 50

78

Overturned

Strike and dip of foliation

Inclined 

Vertical

Dike—Sandstone

Diabase—Ordovician/Cambrian

80

3,000

2,000

1,000

Sea level

METERS FEET

C C’

10,000

8,000

6,000

4,000

2,000

No vertical exaggeration, surficial deposits not shown

-2,000

-4,000

Sea level

West East

-2,000

-1,000

Tsp

Kb Kd

Jm

Klf

Kp

Kd

Jm

Pg Tsp m –m Yg Xf Xb

Klf

Reinecker Ridge Elkhorn surface ELKHORN THRUST

Hunt No. 1-17

Tarryall Federal

test hole 

Proterozoic rocks,

undifferentiated

Proterozoic rocks,

undifferentiated

Kn Kp

Kb

Kn

M

3,000

2,000

1,000

Sea level

METERS FEET

B B’

10,000

8,000

6,000

4,000

2,000

No vertical exaggeration, surficial deposits not shown

Sea level

West East

Yg

Tsf

Tsc

Kl Kn Kb Kd

Jm

Kf

TKsr/Ksvs Kp

YXmr

Xh

Proterozoic rocks,

undifferentiated

Yg

Tpb

Tsf

Tsc

Kl

Kn

Kn Kb

Kd

Jm

Kf

TKsr/Ksvs

Kp

YXmr

Proterozoic basement rocks,

undifferentiated

3,000

2,000

1,000

Sea level

METERS FEET

A A’

Michigan Hill

syncline

10,000

8,000

6,000

4,000

2,000

No vertical exaggeration, surficial deposits not shown

Sea level

West East

Seymour (1962)

Bryant Reconn.

 (1971–1976)

Barker and Wyant

(1976)

Robinson and others

(1974)

Bryant (1976) Bryant (1974) Peterson (1964) Scott (1963a; 1963b)

Navas (1966)

Singewald (1951)

Widmann and others 

(2005)

Wyant and Barker

(1976)

Johnson (1961)

Trimble and Machette

(1979)

Navas (1966)

Widmann and others

(2006)

Sawatzky (1967)

Ruleman and Bohannon

(2008)

Bohannon

and Ruleman

(2009)

Lozano (1965)

Bryant Reconn.

(1971–1976)

Wobus (1976)

Hawley and Wobus

(1977)

Hawley and Wobus

(1977)

Singlewald (1943)

Temple and others

(2007)

Barker and others

(1975)

Bryant Reconn.

(1971–1976)

Bryant and Wobus

Reconn.

1971–1976

Bryant and Wobus

Reconn.

1971–1976

Bryant Reconn.

(1971–1976)

Bryant Reconn.

(1971–1976)

Bryant Reconn.

(1971–1976)

Bryant Reconn.

(1971–1976)

Bryant Reconn.

(1971–1976)

Bryant Reconn.

(1971–1976)

Bryant Reconn.

(1971–1976)

Bryant Reconn.

(1971–1976)

Lozano (1965)

Kirkham and others

(2006)

SOURCES OF GEOLOGIC DATA

Temple and others

 (2008)

Harms (1959)

Boreas Pass Jefferson Mount Logan Shawnee Bailey Pine Platte Canyon Kassler

Como Milligan Lakes Observatory Rock Topaz Mountain Windy Peak Green Mountain Deckers Devils Head

Fairplay East Elkhorn Eagle Rock Farnum Peak McCurdy Mountain Cheesman Lake Westcreek Dakan Mtn

Garo Hartsel Sulphur Mtn Glentivar Tarryall Hackett Mtn Signal Butte Mount Deception

106°00’ 

39°30’ 

105°00’ 

39°00’ 

mw

Qa

Qay

Qai

Qs

Qv

Qao

QNr

Qbc

Qpl

Qsw

Qac

Qf

Qc

Qdf

Qls

Qlso

Qt

Qrg

Qtp

Qtb

Qti

Qlo

Tg

Tdg

Tw

Ts

Tt

Ta

Ttc

Twm

Tan

Tpb

Tqp

Tmp

Txc

Tsl

Tsc

TKsr

Ksvs

TKda

Ka

Kl

Kf

Klf

Mine-waste (latest Holocene)

Young alluvium (late Pleistocene)

Post-Piney Creek alluvium and Piney Creek Alluvium, undivided, and youngest

 alluvium in mountain valleys and South Park (Holocene and late Pleistocene?)

Intermediate alluvium (late middle? Pleistocene)

Slocum Alluvium (middle Pleistocene)

Verdoe Alluvium (middle Pleistocene)

Old alluvium (middle and early? Pleistocene)

Rocky Flats Alluvium (early Pleistocene and late Pliocene?)

Bog clay and peat (Holocene and late Pleistocene)

Water-Laid and Lacustrine Deposits

Alluvial and Mass-Movement Deposits

Mass-Movement and Glacial Deposits

Artificial-Fill Deposits

Alluvial Deposits

SURFICIAL DEPOSITS

TERTIARY SEDIMENTARY AND VOLCANIC ROCKS

OF SOUTH PARK

TERTIARY SEDIMENTARY ROCKS

OF THE FRONT RANGE

INTRUSIVE ROCKS OF THE BERTHOUD PLUTONIC SUITE

(MESOPROTEROZOIC)

INTRUSIVE ROCKS OF UNCERTAIN AGE

(MESOPROTEROZOIC OR PALEOPROTEROZOIC)

INTRUSIVE ROCKS OF THE ROUTT PLUTONIC SUITE

(PALEOPROTEROZOIC)

METASEDIMENTARY AND METAIGNEOUS ROCKS

(PALEOPROTEROZOIC)

LARAMIDE AND POST-LARAMIDE SEDIMENTARY AND ROCKS OF THE PIKES PEAK BATHOLITH (MESOPROTEROZOIC)

VOLCANIC ROCKS OF SOUTH PARK AND

THE FRONT RANGE

PRE-LARAMIDE SEDIMENTARY ROCKS

OF THE DENVER BASIN AND SOUTH PARK

Playa deposits (Holocene and late Pleistocene)

Sheetwash deposits (Holocene and late Pleistocene)

Alluvium and colluvium, undivided (Holocene and late Pleistocene)

Fan deposits (Holocene and late Pleistocene)

Colluvium (Holocene to middle? Pleistocene)

Debris-flow deposits (Holocene to middle? Pleistocene)

Landslide deposits (Holocene to late Pleistocene)

Older landslide deposits (Holocene and middle? Pleistocene)

Talus deposits (Holocene to middle? Pleistocene)

Rock-glacier deposits (Holocene and latest Pleistocene)

Till of Pinedale age (late Pleistocene)

Till of Bull Lake age (late middle Pleistocene)

Till of Pinedale, Bull Lake, and pre-Bull Lake age, undivided

 (late and middle Pleistocene)

Loess (late and middle? Pleistocene)

Gravel deposits (Pliocene? and Miocene?)

Gravel at Divide (Miocene)

Wagontongue Formation (Miocene)

Sedimentary rocks of Fairplay paleovalley (Oligocene)

Glacial Deposits

Eolian Deposits

Tuff (Oligocene)

Antero Formation (Oligocene)

Tallahassee Creek Conglomerate (Oligocene)

Wall Mountain Tuff (Eocene)

Andesitic flow breccia, ash-flow tuff, and related intrusive rocks (Eocene)

Biotite quartz latite porphyry (Eocene)

Monzogranite of Boreas Mountain, Mount Guyot, and

 Bald Mountain (Eocene)

Monzogranite porphyry (Eocene)

Syntectonic conglomeratic unit (Paleocene)

South Park Formation, undivided (Paleocene and Upper Cretaceous),

 shown in cross section C–C’ only, consisting of Tsf, Tsl, Tsc, and TKsr

Tsf Fine-grained arkosic member (Paleocene)

Link Spring Tuff Member (Paleocene)

Conglomerate member (Paleocene)

Reinecker Ridge Volcanic Member (Paleocene and Upper Cretaceous)

Lower volcaniclastic member (Upper Cretaceous)

Dawson Arkose (Paleocene and Upper Cretaceous)

Thin Cretaceous Andesite Dikes (Upper Cretaceous?)

Laramie Formation (Upper Cretaceous)

Fox Hills Sandstone (Upper Cretaceous)

Laramie Formation and Fox Hills Sandstone, undivided (Upper Cretaceous),

 shown in cross section C–C’ only

LIST OF MAP UNITS

YgP

YgPf

YgPqg

Yg

YXp

Xqg

Xbm

Xqd

Xgg

Xpgd

Xb

Xbh

Xbs

Xca

Xf

Xfh

Xh

Xhc

Xhq

YgPcp

YgPfp

YgPs

YXgd

Kp

Kn

PROTEROZOIC INTRUSIVE ROCKS

ORDOVICIAN(?), CAMBRIAN(?), OR NEOPROTEROZOIC(?)

INTRUSIVE ROCKS

ROCKS OF THE PIKES PEAK BATHOLITH AND RELATED ROCKS

OF THE REDSKIN STOCK (MESOPROTEROZOIC)

Pierre Shale (Upper Cretaceous)

Niobrara Formation (Upper Cretaceous)

Benton Group (Upper Cretaceous)

Niobrara Formation and and Benton Group, undivided (Upper Cretaceous)

Pierre Shale, Niobrara Formation, and Benton Group, undivided

 (Upper Cretaceous)

Dakota Group or Dakota Sandstone (Lower Cretaceous)

Kb

Knb

Ku

Kd

Jm

Jmr

KJdm

Pl

Pl

Pg

Pf

Pm

m

Mlw

Om

s

M

OZd

YgRf

YgRp

YgRg

Pmm

YgRm

Morrison Formation (Upper Jurassic)

Morrison Formation and Ralston Creek Formation, undivided

 (Upper Jurassic)

Dakota Group (Lower Cretaceous) and Morrison Formation (Upper

 Jurassic), undivided

Lykins Formation (Triassic? and Permian)

Lyons Sandstone (Cisuralian)

Garo Formation (Permian)

Fountain Formation (Cisuralian and Pennsylvanian)

Maroon Formation (Cisuralian and Middle Pennsylvanian)

Minturn Formation (Middle Pennsylvanian)

Maroon and Minturn Formations, undivided (Cisuralian and

 Middle Pennsylvanian)

Leadville Limestone and Williams Canyon Formation, undivided (Mississippian)

Manitou Formation (Lower Ordovician)

Sawatch Formation (Upper Cambrian)

Leadville Limestone and Williams Canyon Formation (Mississippian),

 Manitou Formation (Lower Ordovician), and Sawatch Formation 

 (Upper Cambrian), undivided

Diabase

Redskin granite fine-grained facies 

Redskin porphyritic granite facies

Redskin equigranular granite facies 

Gabbro and monzogranite associated with Redskin stock and Pikes Peak

 batholith

Pikes Peak Granite

Pikes Peak coarse-grained prophyritic phase

Pikes Peak fine-grained granite

Pikes Peak fine-grained porphyritic granite

Pikes Peak monzogranite to granodiorite 

Syenite and fayalite granite of Pikes Peak batholith

Monzogranite and granite

Pegmatite and aplite

Mixed metamorphic and igneous rocks

Mixed metamorphic and igneous rocks 

Granodiorite and monzogranite of unknown age

Monzogranite and granodiorite

Mixed metamorphic and igneous rocks

Quartz diorite

Granitic gneiss

Porphyritic biotite granodiorite gneiss

Biotite gneiss

Interlayered biotite gneiss and schist, hornblende-plagioclase gneiss, 

 and amphibolite

Biotite-sillimanite gneiss and schist

Calc-silicate gneiss, marble, and amphibolite

Quartz-feldspar gneiss

Quartz-feldspar gneiss and hornblende gneiss

Hornblende-plagioclase gneiss and amphibolite

Hornblende gneiss and calc-silicate gneiss

Amphibolite, marble, and quartzite

YXqgm

YXmr

Tsp

mw

Qti Qlo

Qtp

Qtb

Qt

Qls Qrg

Qc Qdf

Qbc Qpl Qsw Qac Qf

Qa

Qay

Qa

Qs

Qv

QNr

Qlso

? ? ? ? ?

?

?

?

?

Tqp

Tmp

Ka

Xqg Xpgd Xgg Xbm Xqd Xb Xbh Xbs Xca Xf

YXp YXmr YXqgm YXgd

Yg

YgP YgPcp YgPf YgPfp YgPs YgPqg

OZd

?

YgRf YgRp YgRg YgRm

Pl

TKda

Tg

Tdg

Ts

Tw

Ta Tt Ttc

Tan Twm Tpb

Txc

Tsf

TKsr

Ksvs

Tsc

Tsl

?

?

Kl

Klf

Kf

Kp

Kn

Kb

Kd

Knb

Ku

KJdm

Jmr

Jm

Pl

Pg

Mlw

Om

Pf

s

M

m

Pm

Pmm 

Xfh Xh Xhc Xhq

Laramide rocks

South Park

Formation

Post-Laramide rocks

Sedimentary and volcanic rocks

of South Park

Sedimentary rocks

of the Front Range Intrusive rocks

BEDROCK DEPOSITS

SURFICIAL DEPOSITS

CORRELATION OF MAP UNITS

Metamorphic rocks

Eolian

deposits

Glacial

deposits

Mass-movement

and glacial

deposits

Alluvial and

mass-movement

deposits

Lacustrine

deposits

South Park

alluvium

Colorado

Piedmont

alluvium

Minewaste

QUATERNARY

TERTIARY

CRETACEOUS

JURASSIC

TRIASSIC

PERMIAN

PENNSYLVANIAN

MISSISSIPPIAN

ORDOVICIAN

CAMBRIAN

NEOPROTEROZOIC

MESOPROTEROZOIC

PALEOPROTEROZOIC

Paleogene

Neogene

Holocene

Pleistocene

Pliocene

Miocene

Oligocene

Eocene

Paleocene

Upper Cretaceous

Lower Cretaceous

late

middle

early

late

early

Qao

Qai

Tsp

Scientific Investigations Map 3156

Pamphlet accompanies map

U.S. Department of the Interior

U.S. Geological Survey

Any use of trade names is for descriptive purposes only 

and does not imply endorsement by the U.S. Government

For sale by U.S. Geological Survey Information Services

Box 25286, Federal Center, Denver, CO 80225

1-888-ASK-USGS

ArcInfo coverages and a PDF for this map are available at 

http://pubs.usgs.gov/sim/3156/

Suggested citation:

Ruleman, C.A., Bohannon, R.G., Bryant, Bruce, Shroba, R.R.,

and Premo, W.R., 2011, Geologic map of the Bailey 30’ x 60’

quadrangle, North-Central Colorado: U.S. Geological Survey

Scientific Investigations Map 3156, scale 1:100,000,

pamphlet, 38 p.

Geologic Map of the Bailey 30' × 60' Quadrangle, North-Central Colorado

By

Chester A. Ruleman, Robert G. Bohannon, Bruce Bryant, Ralph R. Shroba, and Wayne R. Premo

2011

CONVERSION FACTORS

Multiply By To obtain

inches (in.)

feet (ft)

miles (mi)

2.54

0.3048

1.609

centimeters (cm)

meters (m)

kilometers (km)

See “Sources of Geologic Data” 

Digital map database prepared by

Paco R. Van Sistine

Editing and digital cartography by

Gayle M. Dumonceaux

Denver Science Publishing Network

Manuscript approved for

publication March 13, 2011

Base from U.S. Geological Survey, 1983

Projection and 10,000-meter grid, zone 13

Universal Transverse Mercator

25,000-foot grid ticks based on Colorado

coordinate system, central zone

1927 North American Datum

QUADRANGLE LOCATION

COLORADO

1 0 1 2 43 5 6 7 8 9 10 KILOMETERS

SCALE 1: 100 000

1 0 1 2 3 4 5 6 7 8 MILES

CONTOUR INTERVAL 50 METERS

NATIONAL GEODETIC VERTICAL DATUM OF 1929

APPROXIMATE MEAN

DECLINATION, 1983

12°

TRUE NORTH

MAGNETIC NORTH

41°

109° 102°

37°

109°

LOCATION MAP OF BAILEY QUADRANGLE

1 0 1 2 43 5 6 7 8 9 10 KILOMETERS

SCALE 1:100 000

1 10 2 3 4 5 6 7 8 MILES Structural setting of the Bailey, Colo. 1:100,000-scale geologic map. Individual 7.5’ quadrangles listed and outlined in yellow. Black

faults show faults and shear zones of Proterozoic and (or) Laramide age, with teeth on the hanging wall of thrust faults. Orange lines

show faults of Neogene age and probable late Neogene age. Red faults are faults with evidence of Quaternary faulting.

105 00’

39 00’

106 00’

39 30’

Elkhorn Surface

Elk

h

o

rn

fa

ult

Tarryall Mountains

Platte River Mountains

Kenosha Mountains

Tarryall

Creek

Manitou Park

South

Platte

River

North

Fork South

Platte

River

South

Platte

River

Williams Range thrust fault

South Park

Rampart Range

Colorado piedmont

Mount Logan

Hogback

belt

Mount Guyot

Signal Butte

Antero

Reservoir

Farnum 

Peak

Michigan Hill

Tarryall Creek

Puma Hills

Pine

Junction

Kassler

Fairplay

GEOLOGIC STRUCTURE MAP