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DILLON 1.3 MI.R. 77 W.

°

68

65

15

53

12

17

16

50

27

29

12

22

39

16

18

20

32

10 15

22

24

18

820

20

16

32

56

38

23

4544

42

24 27

20

27

24

29 17

9

23

20

55

68

39

18

1210

813

12 20

18

15

1825

23

73

14

30

15 40

12

23

43

7

10

10

2

17

19

12

21

15

30

20

23

23

3078

58

27

30

77

22

32

2339

32

26

40

25

37

21

27

80

20

20

34

20

27

2440

14

29

31

20

28

24 18 20

25

2234

26

20

27

20

3724

41

25

3530

40

13

35

30

28

28

31

1926

33

21

23

15

23

39

63

15

12

34

41

40

42

52

60

5472

33

35

43

42

42

40

80

64

42

50

45

33

30

45

55

57

62

65

64

50

53

59

44

53

35

45

10

22

55

23

47

5562

59

76

41

8072

75

7

66

7

7

63

80

65

6065

60

7

61

78

62

70 72

69

87

61

72

80

87

78

33

70

5278

77

7260

85

50

85

65 60

54

79

7260

75

88 75

69

82

74

80

67

20

66

37

75

69

75 65

88

48

67

76

33 50

28

254533

26

38

72

32

25

22

45

48

20

30

20

7

23

5631

15

5

42

34

22

3438

25

81

44

LIST OF MAP UNITS

af

dt

Qal

Qw

Qav

Qry

Qr

Qf

Qt

Qc

Qac

Qls

Qls (Kb)

Qg

Qop

Qtp

Qtb

Qgo

QTd

QTgm

SCALE 1:24 0001/ 21 0 1 MILE

1 KILOMETER1 .5 0

CONTOUR INTERVAL 40 FEETNATIONAL GEODETIC VERTICAL DATUM OF 1929

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QTls

Kpm

Kps

Kpl

Kn

Jm

Kb

Kd

Je

��cm

YXu

YXdi

YXp

Xgg

Xgd

Xmg

Xhpg

Xbg

Xum

Artificial fill (recent)

Dredge tailings (recent)

Alluvium (Holocene)

Wetland deposits (Holocene)

Avalanche deposits (Holocene)

Active rock-glacier deposits (Holocene)

Travertine (Holocene)

Inactive rock-glacier deposits (Holocene and upper Pleistocene)

Fan deposits (Holocene and upper Pleistocene)

Talus (Holocene and upper Pleistocene)

Colluvium (Holocene and upper Pleistocene)

Alluvium and colluvium, undivided (Holocene and upper Pleistocene)

Younger landslide deposits (Holocene and upper Pleistocene)

Large landslide deposit composed entirely of Benton Shale

Terrace gravel (Holocene to middle Pleistocene)

Pinedale outwash deposits (upper Pleistocene)

Till of Pinedale glaciation (upper Pleistocene)

Till of Bull Lake glaciation (middle Pleistocene)

Older outwash gravel (middle or lower Pleistocene)

Diamicton (middle Pleistocene to Pliocene?)

Older landslide deposits (middle Pleistocene to Pliocene)

Bouldery gravel of Mesa Cortina ("Buffalo placers") (middle Pleistocene to Pliocene?)

Bouldery gravel of Gold Run (middle or lower Pleis-tocene to Pliocene)

Quartz monzonite porphyry (Eocene)

Hornblende-biotite monzonite porphyry (Eocene)

Pierre Shale (Upper Cretaceous)

Shale and sandstone member

Kremmling Sandstone Member

Lower shale member

Niobrara Formation (Upper Cretaceous)

Benton Shale (Upper Cretaceous)

Dakota Sandstone (Lower Cretaceous)

Morrison Formation (Upper Jurassic)

Entrada Sandstone (Middle Jurassic)

Chinle (Upper Triassic) and Maroon Formations (Lower Permian to Middle Pennsylvanian), undivided

MIDDLE AND LOWER PROTEROZOIC ROCKS

Middle and Lower Proterozoic rocks, undivided— Shown on cross sections only

Diorite (Middle and Lower Proterozoic)

Pegmatite (Middle and Lower Proterozoic)

LOWER PROTEROZOIC ROCKS

Routt Plutonic Suite

Granitic gneiss

Granodiorite

Migmatite

Amphibolite and hornblende-plagioclase gneiss

Biotite gneiss

Ultramafic rock

Contact—Dashed on map where approximately located; dotted where concealed

Normal fault—Dashed where approximately located; dotted where concealed. Bar and ball ondownthrown side

Thrust fault—Dashed where approximately located;dotted where concealed. Teeth on upper plate

Strike-slip fault—Showing relative movement; dashedwhere approximately located

Anticline or antiform—Showing trace of axial plane

Syncline or synform—Showing trace of axial plane

Strike and dip of beds

Inclined

Strike and dip of jointing

InclinedStrike and dip of foliation

Inclined

Vertical

Strike and dip of foliation and bearing and plunge of lineation—Lineation defined by aligned mineral grains, mullion structures, and small fold axes. Inmost cases, lineation interpreted to be stretchingdirection during ductile deformation

Quartz vein—Commonly vuggy, showing multiple growth stages; as wide as about 5 m; locally contains sulfide minerals

60

5631

��cm

50

70

GEOLOGIC MAP OF THE FRISCO QUADRANGLE, SUMMIT COUNTY, COLORADO

By Karl S. Kellogg, Paul J. Bartos, and Cindy L. Williams

2002

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9,000

10,000

11,000

12,000

13,000

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Tenmile Range

SE

CT

ION

BE

ND

IN

14,000

8,000

9,000

10,000

11,000

12,000

13,000

FEET14,000

E E'

E

E'

TENMILE CREEK NORTH TENMILECREEK

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10,000

9,000

8,000

7,000

ThrustWilliams Range

SE

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11,000 11,000

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FEETFEET

SNAKERIVERARMDILLON

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9,000

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D D'

Gold Run Gulch

Galena Gulch

D

D'

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

106°07'30"39°30'

106°07'30"39°37'30"

Base from U.S. Geological Survey 1970Photorevised 1987 Polyconic projection; longitude of central meridian 105.5°North American Datum of 1927; 10,000-foot grid based on Colorado coordinate system, central zone;1000-meter grid ticks, zone 13

13 / 12

APPROXIMATE MEANDECLINATION, 2001

TRU

E N

OR

TH

MA

GN

ETIC

NO

RTH

Any use of trade names in this publication is fordescriptive purposes only and does not imply endorsement by the U.S. Geological Survey

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

This map was produced on request, directly from digital files, on an electronic plotter. It is also available as a PDF file at http://geology.cr.usgs.gov

Geology mapped 1997-98; assisted in the field by A.M. Licamelli. Sharon Smith, R.G. Kuehn, and K.S. Morgan assisted with preparation of the digital filesDigital cartography layout by William E. SowersPreparation of GIS files for map layout by Nancy Shock

Manuscript approved for publication June 20, 2000

106°00'39°30'

39°37'30"106°30'

Unconformity

Intrusive contact

Unconformity

Unconformity

Unconformity

YXu

YXdi

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YXp

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Qls Holocene

Pleistocene

Pliocene

Eocene

Upper Cretaceous

Upper Jurassic

Middle Jurassic

MIDDLE PROTEROZOIC

Lower Cretaceous

Upper Triassic to MiddlePennsylvanian

QUATERNARY

TERTIARY

CRETACEOUS

JURASSIC

TRIASSIC TO PENNSYLVANIAN

LOWER PROTEROZOIC

CORRELATION OF MAP UNITS

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Qls (Kb)

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MISCELLANEOUS FIELD STUDIES MAP MF–2340 Version 1.0

Pamphlet accompanies map

COLORADO

Map Area

0 5 10 KM CO

LO

RAD

OF

RO

NT

RA

NG

E

BLU

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RIV

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Dillon

Interstate 70

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TECTONIC LOCATION MAP

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Breckenridge

DillonReservoir

GO

RE

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E

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RA

NG

E

FRISCOQUADRANGLE

39°30'

39°45'

106°00'

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land

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INDEX MAP SHOWING SURROUNDING QUADRANGLES

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Jm

Je

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(BOREAS PASS)

(DILLON)

(VA

IL P

AS

S)

(KEY

STO

NE)

32'30"32'30"

4379

4378

4377

4374

4373000m.N.

4380

4381`

4382

4383

4385

4386

6500FEET

35'

T. 5 S.

T. 6 S.

4144134122'30" 1 850000 FEET410406405404000m.E.

4377

4376

4375

4374

4373

610 000FEET

404 405 1 830 00 FEET 406 407 408 409 2'30" 411 412 413000m.E.

LOV

ELA

ND

PA

SS

12M

I.G

EOR

GET

OW

N 2

7 M

I.LI

NC

OLN

7 M

I.

0.4 Mi. TO COLO. 9 DILLON 1.1 MI.

4379

4378

VAIL

24

MI.

WH

EELE

R J

UN

CTI

ON

(CO

LO. 9

1) 5

MI.

4386000m N.

4385

4384

4383

4383

35"

BRECKENRIDGE 1.2 MI.

Qtr

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Xhpg

Xhpg

Xhpg

Qtr

Kn

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Jm

Jm

CONVERSION FACTORS

Multiply By To obtain

centimeters (cm) 0.3937 inches (in.)meters (m) 3.281 feet (ft)kilometers (km) 0.6214 miles (mi)

Multiply By To obtain

inches (in.) 2.54 centimeters (cm)feet (ft) 0.3048 meters (m)miles (mi) 1.609 kilometers (km)

Xbg

Xgd

Jm

COLORADO

QUADRANGLE LOCATION

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