GEOLOGIC INVESTIGATIONS SERIES IÐ2592 U.S. DEPARTMENT OF THE INTERIOR SHEET 2 of 2 U.S. GEOLOGICAL SURVEY Pamphlet accompanies map

DARRINGTON-DEVILS MOUNTAIN A FAULT ZONE A' A" STRAIGHT CREEK FAULT ZONE METERS Granite Lakes METERS 2500 Knu Hidden 2500 Kmf TKhl Lake dan Creek 2000

2000 r Kns (Keds) Kjl Deer Creek Ked Higgins Creek Higgins RINKER Jo

BEND IN Kmd SECTION 1500 FRAILEY Tsh Cascade River 1500 TKhg TKhs Tbs Ked RIDGE Kns ENTIAT TKns MOUTAIN Qg Kes North Fork River Stillaguamish Illabot Creek TKev Deer Creek Qg Tbs Tbr Tbs Krs Kes FAULT 1000 Qa Qg Ked TKns 1000 TKhm Sauk River Kes TKev TKhm 500 Qg Qg Qa 500 TKhm Tbs SEA LEVEL SEA LEVEL Tbr PDcs 500 TKcs 500 SHUKSAN 1000 THRUST FAULT TKcs 1000 1500 1500

STRAIGHT CREEK DARRINGTON-DEVILS MOUNTAIN FAULT ZONE ENTIAT B B' SNOWKING B" FAULT ZONE FAULT CASCADE MOUNTAIN CREST METERS METERS SEGELSON 2500 WHEELER MOUNTAIN Tmbt TKcc 2500 BEND IN RIDGE SECTION Kchm TKmm TKcs Illabot Creek 2000 South Fork Cascade River 2000 Kindy Creek TKmd TKcc TKcs Middle Fork Cascade River Grade Creek Grade Kbl Boulder River (Kes) SHUKSAN Kchb

ug Lake Kcl Jim Creek Kes Kca Kns TKcs J Sauk River Kns 1500 TKhm TKhf NORTH THRUST Kes Kcl Tmbt Tdt 1500 MOUNTAIN Tss Tdt Qg Tbs Kes FAULT Kem Qg TKcs TKt North Fork River Stillaguamish 1000 TKt TKws Qg 1000 Qg TKtg (Keds) Krs Ked Ked Qg TKt TKwph TKev TKew TKhm Qg 500 Qa Qg Qg Tbs Qg Ked Qg Kes 500 Qa Qa Kes Qa SEA LEVEL TKws SEA LEVEL PDcs 500 500

1000 1000 1500 1500

DARRINGTON-DEVILS MOUNTAIN STRAIGHT CREEK C FAULT ZONE FAULT ZONE C'

HELENA MEADOW LIME RIDGE METERS Ksg METERS RIDGE MOUNTAIN 2500 2500 LIBERTY Ksmf Kdc Lime Creek Kca Kblg 2000 GREEN Ksmm MOUNTAIN Goodman Creek Kng Ksmm 2000

MOUNTAIN Tbs Helena Creek TKhf Tcpl Sauk River Clear Creek Tbv 1500 Suiattle River Tst PDcs 1500 orthy Creek TKec Tbsv Tbs TKhm Tbv Ksc Kns TKwph Ked KJb River White Chuck 1000 River Pilchuck W South Fork River Stillaguamish TKt Ked Kes Kng TKev Kes PDcs Kns 1000 Thl TKws Tbv PDcs Qg TKws Qg Qg Qg 500 Qg Qg 500 Tss SEA LEVEL SEA LEVEL TKhm Kcm 500 500 TKwph TKwg Ksc 1000 Knu 1000

1500 1500 bmg 2000 2000

DARRINGTON-DEVILS MOUNTAIN D FAULT ZONE D' GAMMA RIDGE

ista Glacier METERS METERS DICKERMAN Ptarmigan Glacier V 2500 BALD MOUNTAIN 2500 MALLARDY Qgd Qgd Qgd Sauk River Sauk River

MOUNTAIN Camp Creek Qgd 2000 RIDGE Kng 2000

Blackjack Creek Blackjack Tgrv Tbv Tbr Kdm South Fork Boardman Creek Boardman North Fork Ksmm Suiattle River Kng River White Chuck Qgd 1500 PILCHUCK RIVER FAULT TKwu TKev CREEK FAULT STRAIGHT Qgd 1500 Tbs Tbv Kng Kng Ksc Qgwf Ktd Qgsf Pilchuck River Pilchuck bmg bms TKec TKwph TKev South Fork River Stillaguamish Tbr 1000 TKws TKws Ked Ksc Kca Kns 1000 Qg Qg Tsrd Qg Kch Tcpl Tfs Qg 500 Qg Kca Tcpd 500 SEA LEVEL bmg Tsbt Tbs Tbs Kng SEA LEVEL TKws 500 TKhm 500 TKhm 1000 (TKev) 1000 1500 1500 500 meters = 1640.4 feet Qa, simplified unconsolidated non-glacial deposits, Qmv, Qyal, Qa, Ql, Qf, and Qglh Qg, simplified glacial deposits, Qvt, Qvr, Qag, Qvrs, Qvi Qgp and small areas of unconsolidated deposits not shown

15 122°00' 121°00' 122°00' 17 121°00' 122°00' 121°00' 48°30' 48°30' 48°30' 11 43 44 2 Rockport 29 Rockport 18 Rockport 9 21 Mount 48 Mount S S S a Formidable 53 49 a a Snowking u Snowking u 42 u Formidable 33 k k k Mountain 12 Mountain R R R 50 Snowking i i i v v v 28 e e Mount e r r Mountain r 4 Formidable 26 Mount 47 Su ia Misch 41 tt le Mount Misch 11 Mount Misch R i v 16 e r 10 38 amish River River k Stillaguamish River Fork Stillagu rk Stillaguamish North For North Sui North Fo 50 22 attleR 35 Suiattle iv Riv 36 Whitehorse Darrington er 13 er Mountain 23 S S S 25 au S 1 uiatt 15 a k uiatt 3 le uk 30 Suiattle R le Riv R iv Riv 6 er iv R 48 46 er er Sa Whitehorse e 31 iv 6 u W r er Whit k hite C Wh e Ch 39 huc Mountain ite C uck R k 14 huc 34 iv R k R e iv 20 40 ive r er 15 r Glacier Glacier 31 15 R 45 i 52 v Peak Glacier Peak e outh Fork Stillag 6 South Fork Stillagua r South Fork Stillag 42 S uamish mish uamis Peak Ri R 8 27 h R ver iver Granite Granite Granite Big Falls Tenpeak Falls 32 24 Tenpeak Falls Tenpeak Pilchuck Big Pilchuck Four Pilchuck Mountain 19 Mountain Mountain A Mountain Four B Mountain C Mountain Big 41 5 15 7 37 Four 48°00' 48°00' 48°00' 41 51 Map A Map B Map C 1. Booth (1989) 7. Baum (1968, Pl. I) 18. Dougan (1993) 26. Jones (1959, Pl. II) 36. Bittenbender (1991, Pl 1) 45. Menzer (1966, fig. 1) 2. Brown and others (1982, fig. 2) 8. Beach (1962, map 4) 19. Dungan (1974, Pl. 3) 27. Longtine (1991, Pl. l) 37. Carithers and Guard (1945, Pl. I) 46. Miers (1970, Pl. I) 3. Crowder and others (1966) 9. Bechtel, Inc. (1979, Appendix 20. A.B. Ford, W.H. Nelson, R.A. 28. Milnes (1976, Pl. I) 38. Kinder-Cruver (1981) 47. Miller (1979) 4. Tabor (1961, Pl. XXIV) H, Sheet 1) Sonnevil, R.A. Loney, Carl 29. Robertson (1981, Pl. I) 39. Ford (1959, Pl. 5) 48. Misch (1977b, figs. 1, 2, 3) 5. Tabor and others (1982b) 10. Boak (1977) Huie, R.A. Haugerud, and S.L. 30. Silverberg (1985, Pl. I) 40. Ford (1983) 49. Morrison (1977) 6. J. A. Vance (unpub. field maps 1959-1985) 11. Brown and others (1987) Garwin (unpub. U.S. 31. Vance (1957a, Pl. I) 41. Grant (1969, figs. 3, 22, 24) 50. Russel (1900, Pl. IX) 12. Brown and others (1994) Geological Survey geologic 32. Wiebe (1963, Pl. 1) 42. Grant (1982) 51. Spurr (1901) 13. Bryant (1955, Pl. XLVIII) map) 33. Reller (1986, Pl. 1) 43. Heller (1978) 52. Vance and others (1980, fig. 3) 14. Danner (1957, Pl. XII) 21. Fluke (1992) 34. Tabor and Crowder (1969, Pl.l) 44. McCleary and others (1978, fig. 13) 53. Wilson (1978) 15. Danner (1966, p. 290, 302, 22. Franklin (1974, Pl. 1) 35. D. F. Crowder (unpub. U.S. 312, 318, 326, 333) 23. Grant (1966) Geological Survey field maps, 16. Dotter (1977) 24. Heath (1971, Pl. I) 1963) 17. Dragovich (1989) 25. Jenne (1978, Pl. I)

Figure 1. Previous geologic studies within the Sauk River quadrangle, Washington. A, Much data used, with little to modest modification; B, Some data used; C, Consulted extensively but data not directly used on map.

GEOLOGIC MAP OF THE SAUK RIVER 30- BY 60-MINUTE QUADRANGLE, WASHINGTON By For sale by U.S. Geological Survey, Information Services, Box 25286, R.W. Tabor, D.B. Booth, J.A. Vance, and A.B. Ford Federal Center, Denver, CO 80225, or call 1–888–ASK–USGS

Printed on recycled paper 2002 Available on World Wide Web at http://geopubs.wr.usgs.gov/i-map/i2592