1
DEPARTMENT OF THE INTERIOR UNITED STATES GEOLOGICAL SURVEY Base from U.S. Geological Survey, 1956-62 ··' ; ,, a ,, i'l ., , it .f ~".;- ff /l&,f ~"'.,'- ff,;;,"} l~"~ I--~ ~~,f ,t~ i}·"'# ,r"'.:r " " .. ;;: ' ' . " ' ,•' " ,, h ,l:l".f J,~? §... ,l ;t p"/f ;,~ ~,ii •• "'i ~/ p "' ,f'#.i! l! MT HARVARD 1915 GARflHD '"' INDEX TO TOPOGRAPHIC MAPPING 1°X QUADRANGLE IN MONTROSE HUEN~ VISTA ·~ PO~CHA SPRltlGS "'' BOll ~N /A ,., , GLCNWOOQ 5f"r/jN~~ .",4 Ml PRELIMINARY MAP OF Roger B. Colton, CO N !"OU R INTERVAL 20 0 FEET \ VITH SUPPLEMENTA RY CONTOURS AT 100 FOOT INTERVA LS TRANSVERSE MERCATOR PR OJECTION 1%0 MAG NETI C U£CL IN .\ TI ON FOR TH I S '>HEET · ·~Rl [S rno r< !4° \5 ' EAOH PI .Y FOR THE c rnTER OF" THE \'/ EST o~ c, TO 13° 38' £ SS TElllY FOR THF CEN TF R (IT CH E L! A~T COGS MEAN ,\~NU" Cl l,\N GE ,,; c,0 0 WE<;T rnL Y LANDSLIDE DEPOSITS, MONTROSE By Penny E. Patterson, Jeffrey A. Holligan, 1975 110° 4 ,o QUADRANGLE, COLORADO and Larry W. Anderson 37° II 0 0 3 0' . \I , Ra "1, - -' ; a d C -' 1' 0' Data as of May 1975 102° I ----· --------- --------.------, 41° I VERNAL CRAIG GREELEY I MF- 696 MF-700 MF-704 I I ' I l I GRAND LEADVILLE DENVER I JUNCTION I MF-697 MF- 701 MF-705 I I ' I I I MOAB MONTROSE PUEBLO I MF-698 MF- 702 MF- 706 I I I I I I CORTEZ LA JUNTA I DURANGO TRINIDAD I MF- 699 MF- 703 MF-707 MF- 708 ' : --~i .... _______ 37° 102° -----------~--~-- 1°x QUADRANGLES INCLUDED IN LANDSLIDE STUDY MISCELLANEOUS FIELD STUDIES MAP MF-702 EXPLANATION Areas inferred to be underlain by landslide deposits resulting from landsliding, ava- lanching, block gliding, debris sliding or flowing , earthflows, mudflows, rocksliding, rockfal ls, rotational slides, slab or flake sliding, slumping, talus accumulation, and translational sliding. Rock glacier deposits, colluvium, and solifluction deposits are included in some areas. Some till is mapped with landslide deposits because distinguishing these two deposits from one another is diffi- cult. Furthermore, in some areas till has failed by landsliding and other, types of mass movements. Movement within the deposits varies from none to rapid; rates of movement may also be variable in any given landslide within the same year. Ages of deposits range from early Pleistocene to Holocene. FACTORS AFFECTING MAP ACCURACY* SUGGESTIONS FOR MAP USERS* Landslide deposits that formed since the aerial photographs were taken are not shown. Landslides are more difficult to recognize in heavily for- ested areas and consequently such areas are less accurately mapped- than nonforested areas. Map accuracy varies according to the quality of aerial photographs used. Haze, cloud cover, poor sun angle, and shadows make photointerpretation diffi- cult. Mapping of landslides by photointerpreta- tion presents many problems such as: distinction between terrace-shaped slump-type landslide de- posits and alluvial terrace deposits where bo th are adjacent to stream courses; recognitio_n of landslide deposit boundaries (the upslope bound- ary is commonly defined by an easily recognized scarp but the toe or downslope boundary is seldom well def ined and thus is difficult to locate exactly); recognition of stable masses of bedrock surrounded by landslide deposits, especially where only a small knob projects through; and separation of landslide deposits from glacial deposits. This map should not be used to determine the prob- ability of future landsliding, as geologic and climatic changes during the past few hundred thousand years have altered slope stability and because this map does not provide information regarding composition and type of movement of individual landslide deposits. Therefore, the map is not a substitute for careful detailed large-scale site investigations by engineering geologists and soils engineers. Areas suscep- tible to landslide and related activity should be carefully studied before any development begins. This map has been prepared to provide a regional context for interpreting detailed site investigations and should be used in conjunction with topographic, slope, surficial, bedrock, and soils maps, aerial photographs, and other available information. The limita- tions of this map should be obvious inasnruch as one inch (2.54 cm) on the map equals approximately 3.9 miles (6.4 km) on the ground. *Modifi ed from Nilsen, T. H., 1972 , Preliminary photointerpretation map of landslide and other surficial deposits of the Mount Hamilton quad- rangle and parts of the Mount Boardman and San Jose quadrangles, Alameda and Santa Clara Counties, California: U.S . Geo!. Survey Misc. Field Studies Map MF-339. 108° 39 0 5 P?,""/ 7 //// /// //// /// //// /// /// l/;;;;,i V /// )i '/ -".-".-". 'l 0 38 7 2 4 6 4 8 I 10 /// /// /// 15 r, /// / / -"./, / 12 107° 106° 3 18 16 4 18 18 17 9 II 13 14 //// (/// /// ////. //_/// > //////// ///////// /////////l ///////// ///////// ///////// //////////////1 ////////////// ////////////// /////////////// I //////////////2 ////////////// SOURCES OF INFORMATION Vertical and oblique ae rial photographs covering the entire quadrangle at various scales (1:60,000 and lar ger) and in various years were interpreted by R. B. Colton in 1975. Most aerial photographs used are small-scale (1:60,000) Army Map Service Project 137AV, 1954-55 (available from U.S. Geological Survey). PAR'{ //// ·1 d l"d //////Area of no known lan s 1 es and related ////// deposits, or area of minor landslides and related deposits too smal l to be shown at the present scale. 1. Dickinson, R. G., 1965, Ge olog ic map of the Cerro Summit quadrangle, Montrose County, Colorado: U.S. Geol. Survey Geol. Quad. Map GQ-486 [1966]. 2. Gaskill, D. L., and Godwin, L. H., 1966, Geologic map of the Marcellina Mountain quadrangle, Gunnison County, Co lorado: U.S. Geo!. Survey Geol . Quad. Map GQ-511. 3. Gaskill, D. L., Godwin, L. H., and Mutschler, F. E., 1967, Geologic map of the Oh-be-joyful quadrangle, Gunnison County, Colorado: U.S. Geo!. Survey Geo! . Quad. Map GQ -578. 4. Gaskill, D. L., 1974, unpub. data. 5. Ha il, W. J., Jr., 1972, Reconnaissance geologic map of the Cedaredge area, Delta County, Colorado: U.S. Geol. Survey Misc. Geol. Inv. Map I-697. 6. Hail, W. J., Jr., 1972, Reconnaissance geologic map of the Hotchkiss area, Delta and Montrose Counties, Colorado: U.S. Geol. Survey Misc. Ceol. Inv. Map 1-698. 7. Hansen, W. R. , 1968, Geologic map of the Bl ack Ridge quadrangle, Delta and Montrose Counties, Colorado: U.S. Geol. Survey Geol. Quad. Map GQ-747. 8. Hansen, W. R., 1971, Geologic map of the Black Canyon of the Gunnison River and vicinity, western Colorado: U.S. Geol. Survey Misc. Geol. Inv. Map I -584. 10. 11. 12. 13. 14. 15. 16. 17. 18. Hedlund, D. C., and Olson, J. C., 1973, Geologic map of the Carpenter Ridge quadrangle, Gunnison County, Colorado: U.S. Geol. Survey Geol. Quad. Map GQ-1070 [1974]. Hedlund, D. C., and Olson, J, C., 1974, Geologic map of the Iris NW quadrangle, Gunnison and Saguache Counties, Colorado: U.S. Geol. Survey Geo!. Quad. Map GQ-1134. Luedke, R. G., and Burbank, W. S., 1962, Geology of the Ouray quadrangle, Colorado: U.S. Geol. Survey Geol. Quad. Map GQ-152. Olson, J. C.~ 1975, Geologic ·m ap o{ the Iris quadrangle, Gunnison and Saguache Counties, Colorado: U.S. Geo!. Survey Open-file Report 75-63. Olson, J. C. , 1975, Geologic map of the Houston Gulch quadrangle, Gunniso n and Saguache Cou nties, Colorado: U.S. Geo!. Survey Open-file Report 75-62. Olson, J. C., and Hedlund, D. C., 1973, Geologic map of the Gateview quadrangle, Gunnison County, Colorado: U.S. Geol. Survey Geo!. Quad. Map GQ-1071 [1974 ]. Scott, G. R., 1975, Reconnaissance geologic map of the Buena Vista quadrangle, Chaffee and Park Counties, Colorado: U.S. Geo l. Survey Misc. Field Studies Map /J/J/- ) MF-657. (-<?;/ Scott, C. R., Van Alstine, R. E., and Sharp, W. N., 1975 , Geologic map of the Poncha Springs quadrangle, Chaffee Coun Colorado: U.S . Geo!. Survey Misc. Field Studies Map MF-658·. /') s- 9. Hedlund, D. C., 1974, Geologic map of the Big Mesa quad rangle, Gunnison County, Colorado: U.S. Geol. Survey Geol. Quad. Map GQ-1153 [1975]. Total area. Soule, J., 1975, unpub. maps of geologic hazards in Gunnison-Crested Butte area, Colorado: Colorado Geo!. Survey. Steven, T. A., 1974, unpub. data, M(200) M P-Pu C1 1111111:11i111111!111~111mm111~1111111111111:11~11111 3 1818 00180780 7 For sale by U. $. Geological Survey, price / '~ *U.S. GOVERNMENT PRINTING OHIU, 1975---6!/.340/~I I / 'y ';, Q-

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Page 1: GLCNWOOQ 5fr/jN~~ .,4 Ml

DEPARTMENT OF THE INTERIOR UNITED STATES GEOLOGICAL SURVEY

Base from U.S. Geological Survey, 1956-62

··' ; ,, a

,, i'l .,, it .f ~".;- ff /l&,f ~"'.,'- ff,;;,"}

l~"~ I--~ ~~,f ,t~ i}·"'# ,r"'.:r " " .. ~~ ;;: ' ' .

" ' ,•' " ,, h ,l:l".f ~~ ~· J,~? § ... ,l ;t p"/f ~~~;- ;,~ ~,ii ••

"'i ~/

p

"' ,f'#.i!

l!

MT HARVARD 1915

GARflHD

'"'

INDEX TO TOPOGRAPHIC MAPPING 1°X 2° QUADRANGLE IN MONTROSE

HUEN~ VISTA ·~

PO~CHA SPRltlGS

"''

BOll~N / A ,.,,,

GLCNWOOQ 5f"r/jN~~ .",4 Ml

PRELIMINARY MAP OF

Roger B. Colton,

CON !"OU R INTERVAL 20 0 FEET

\VITH SUP PL EMENTA RY CO NTOURS AT 100 FOOT I NTERVA LS

TR ANSVER SE M ERCATOR PR OJECTION

1%0 MAG NETI C U£CL IN .\ TI ON FOR TH IS '>HEET ··~Rl [ S rno r< !4° \5 ' EAOH PI .Y FOR THE c rnTER OF" THE \'/ EST o~c, TO 13° 38' £ SS TElllY FOR THF CEN TF R (IT CH E L! A~T COGS MEAN ,\~NU" Cl l,\N GE ,,; c,0 0 2· WE<;T rnL Y

LANDSLIDE DEPOSITS, MONTROSE

By

Penny E. Patterson, Jeffrey A. Holligan,

1975

110°

4 ,o

QUADRANGLE, COLORADO

and Larry W. Anderson

37° II 0 0

30'

.\I ~

, Ra " 1,

- -' ; a d C -' 1' 0'

Data as of May 1975

102°

I ----· --------- --------.------, 41° I

VERNAL CRAIG GREELEY I MF- 696 MF-700 MF-704 I I

' I

l I GRAND

LEADVILLE DENVER I JUNCTION I MF-697 MF- 701 MF-705

I I

' I I I

MOAB MONTROSE PUEBLO I MF-698 MF- 702 MF- 706 I I

I I

I I

CORTEZ LA JUNTA I DURANGO TRINIDAD I

MF- 699 MF- 703 MF-707 MF- 708

' : --~i.... _______ 37°

102° -----------~--~--1°x 2° QUADRANGLES

INCLUDED IN LANDSLIDE STUDY

MISCELLANEOUS FIELD STUDIES MAP MF-702

EXPLANATION

~ Areas inferred to be underlain by landslide deposits resulting from landsliding, ava­lanching, block gliding, debris sliding or flowing , earthflows, mudflows, rocksliding, rockfalls, rotational slides, slab or flake sliding, slumping, talus accumulation, and translational sliding. Rock glacier deposits, colluvium, and solifluction deposits are included in some areas. Some till is mapped with landslide deposits because distinguishing these two deposits from one another is diffi­cult. Furthermore, in some areas till has failed by landsliding and other, types of mass movements. Movement within the deposits varies from none to rapid; rates of movement may also be variable in any given landslide within the same year. Ages of deposits range from early Pleistocene to Holocene.

FACTORS AFFECTING MAP ACCURACY* SUGGESTIONS FOR MAP USERS*

Landslide deposits that formed since the aerial photographs were taken are not shown. Landslides are more difficult to recognize in heavily for­ested areas and consequently such areas are less accurately mapped- than nonforested areas. Map accuracy varies according to the quality of aerial photographs used. Haze, cloud cover, poor sun angle, and shadows make photointerpretation diffi­cult. Mapping of landslides by photointerpreta­tion presents many problems such as: distinction between terrace-shaped slump-type landslide de­posits and alluvial terrace deposits where both are adjacent to stream courses; recognitio_n of landslide deposit boundaries (the upslope bound­ary is commonly defined by an easily recognized scarp but the toe or downslope boundary is seldom well def ined and thus is difficult to locate exactly); recognition of stable masses of bedrock surrounded by landslide deposits, especially where only a small knob projects through; and separation of landslide deposits from glacial deposits.

This map should not be used to determine the prob­ability of future landsliding, as geologic and climatic changes during the past few hundred thousand years have altered slope stability and because this map does not provide information regarding composition and type of movement of individual landslide deposits. Therefore, the map is not a substitute for careful detailed large-scale site investigations by engineering geologists and soils engineers. Areas suscep­tible to landslide and related activity should be carefully studied before any development begins. This map has been prepared to provide a regional context for interpreting detailed site investigations and should be used in conjunction with topographic, slope, surficial, bedrock, and soils maps, aerial photographs, and other available information. The limita­tions of this map should be obvious inasnruch as one inch (2.54 cm) on the map equals approximately 3.9 miles (6.4 km) on the ground.

*Modified from Nilsen, T. H., 1972 , Preliminary photointerpretation map of landslide and other surficial deposits of the Mount Hamilton quad­rangle and parts of the Mount Boardman and San Jose quadrangles, Alameda and Santa Clara Counties, California: U.S . Geo!. Survey Misc. Field Studies Map MF-339.

108° 39 0

5

P?,""/ 7 //// ///

//// ///

//// /// ///

l/;;;;,i V /// )i '/ -".-".-". 'l

0 38

7

2 4

6

4

8

I 10

/// /// /// 15

r, /// / / -"./, /

12

107° 106°

3 18

16

4 18 18

17

9 II 13 14

//// (/// ///

////. //_///

> //////// /////////

/////////l ///////// ///////// /////////

//////////////1 ////////////// ////////////// ///////////////

I //////////////2 //////////////

SOURCES OF INFORMATION

Vertical and oblique aerial photographs covering the entire quadrangle at various scales (1:60,000 and larger) and in various years were interpreted by R. B. Colton in 1975. Most aerial photographs used are small-scale (1:60,000) Army Map Service Project 137AV, 1954-55 (available from U.S. Geological Survey).

PAR'{ //// ·1 d l"d //////Area of no known lan s 1 es and related ////// deposits, or area of minor landslides and

related deposits too smal l to be shown at the present scale.

1. Dickinson, R. G., 1965, Geologic map of the Cerro Summit quadrangle, Montrose County, Colorado: U.S. Geol. Survey Geol. Quad. Map GQ-486 [1966].

2. Gaskill, D. L., and Godwin, L. H., 1966, Geologic map of the Marcellina Mountain quadrangle, Gunnison County, Co lorado: U.S. Geo!. Survey Geol . Quad. Map GQ-511.

3. Gaskill, D. L., Godwin, L. H., and Mutschler, F. E., 1967, Geologic map of the Oh-be-joyful quadrangle, Gunnison County, Colorado: U.S. Geo!. Survey Geo! . Quad. Map GQ -578.

4. Gaskill, D. L., 1974, unpub. data. 5. Ha i l , W. J., Jr., 1972, Reconnaissance

geologic map of the Cedaredge area, Delta County, Colorado: U.S. Geol. Survey Misc. Geol. Inv. Map I-697.

6. Hail, W. J., Jr., 1972, Reconnaissance geologic map of the Hotchkiss area, Delta and Montrose Counties, Colorado: U.S. Geol. Survey Misc. Ceol. Inv. Map 1-698.

7. Hansen, W. R. , 1968, Geologic map of the Black Ridge quadrangle, Delta and Montrose Counties, Colorado: U.S. Geol. Survey Geol. Quad. Map GQ-747.

8. Hansen, W. R., 1971, Geologic map of the Black Canyon of the Gunnison River and vicinity, western Colorado: U.S. Geol. Survey Misc. Geol. Inv. Map I -584.

10.

11.

12.

13.

14.

15.

16.

17.

18.

Hedlund, D. C., and Olson, J. C., 1973, Geologic map of the Carpenter Ridge quadrangle, Gunnison County, Colorado: U.S. Geol. Survey Geol. Quad. Map GQ-1070 [1974]. Hedlund, D. C., and Olson, J, C., 1974, Geologic map of the Iris NW quadrangle, Gunnison and Saguache Counties, Colorado: U.S. Geol. Survey Geo!. Quad. Map GQ-1134. Luedke, R. G., and Burbank, W. S., 1962, Geology of the Ouray quadrangle, Colorado: U.S. Geol. Survey Geol. Quad. Map GQ-152. Olson, J. C.~ 1975, Geologic ·map o{ the Iris quadrangle, Gunnison and Saguache Counties, Colorado: U.S. Geo!. Survey Open-file Report 75-63. Olson, J. C. , 1975, Geologic map of the Houston Gulch quadrangle, Gunnison and Saguache Counties, Colorado: U.S. Geo!. Survey Open-file Report 75-62. Olson, J. C., and Hedlund, D. C., 1973, Geologic map of the Gateview quadrangle, Gunnison County, Colorado: U.S. Geol. Survey Geo!. Quad. Map GQ-1071 [1974 ]. Scott, G. R., 1975, Reconnaissance geologic map of the Buena Vista quadrangle, Chaffee and Park Counties, Colorado: U.S. Geol. Survey Misc. Field Studies Map /J/J/- ) MF-657. (-<?;/ Scott, C. R., Van Alstine, R. E., and Sharp, W. N., 1975 , Geologic map of the Poncha Springs quadrangle, Chaffee Coun Colorado: U.S . Geo!. Survey Misc. Field Studies Map MF-658·.

/') s-

9. Hedlund, D. C., 1974, Geologic map of the Big Mesa quad rangle, Gunnison County, Colorado: U.S. Geol. Survey Geol. Quad. Map GQ-1153 [1975]. Total

area.

Soule, J., 1975, unpub. maps of geologic hazards in Gunnison-Crested Butte area, Colorado: Colorado Geo!. Survey. Steven, T. A., 1974, unpub. data,

M(200) MP-Pu

C1

1111111:11i111111!111~111mm111~1111111111111:11~11111 3 1818 00180780 7

For sale by U. $. Geological Survey, price / '~ *U.S. GOVERNMENT PRINTING OHIU, 1975---6!/.340/~I

I / 'y ';, Q-