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Sheet 2 of 2 U.S Scientific Investigations Map 2927 U.S. Department of the Interior Sheet 2 of 2 U.S. Geological Survey Pamphlet and CD-ROM accompany map 155° 115° 225° 190° L C M B A B A M 121°45’ 121°37’30” 121°30’ 121°22’30” 41°30’ 41°30’ SECTOR LOCATION MAP CORRELATION OF MAP UNITS Shaded relief map showing Medicine Lake volcano (magenta outline) divided into 13 radial sectors [Sector letters A-M indicate location of unit on map: see "Sector Location Map" for approximate azimuths of sector boundaries; on map, ends of sector boundaries are indicated by short lines adjacent to map area. (A-M). Approximate azimuths of sector boundaries are shown at end of each sector boundary line Units other than surficial deposits are arranged chronologically within each sector column; units present in more than one sector are shown in multiple sector columns; dashed lines at top and (or) bottom of unit (dot near center of Medicine Lake is starting point for each azimuthal direction). Sector letters indicate that upper and (or) lower chronologic position(s) of unit is (are) poorly constrained. Time division boundaries (dotted lines) are from Richmond and Fullerton (1986); interim ages (5, 13, 100, 180, 300, and indicate location of unit on map in “List of Map Units” and correspond to columns in “Correlation of Map Units.” 500 ka), which are approximate boundaries of five eruptive stages discussed in text (in accompanying pamphlet), are shown as thicker gray lines for reference. Argon-dated units are shown with asterisk (*); see BURNT "Description of Map Units" and table 1 (both in pamphlet) for unit ages. Note that, in sector columns J and K, units rmh, aib, and bmc are shown joined together because their argon ages overlap, but these units LAVA 330° 355° 10° 25° actually do not overlap in field and so their relative ages are unknown] FLOW 121°45' 121°15' 41°52'30" SURFICIAL DEPOSITS VOLCANIC ROCKS g L M Sector: A BCDEFGHI J K LM 115° 48° rgm rgm rlg* rlg rlg rlg p mpp mpp mcf mcf mcf H I rh rh rh G abl bbr abl Holocene J byb dpc dpc HARRIS dm dm dm dm 5 ka MOUNTAIN 11.5 ka bv5 bvc bvc bvc C F K bgc bgc mgf btm bdh bdh brf 295° 13 ka B 75° bwc bwc bup bec bma mna 225° t DERA R bgd bgd bc AL IM C ms bmc* bmc* bmc* rmh* aib* bmc* rmh* aib* bmc* aib* E bwh bwh buc Medicine Lake L msm bci 260° D mts asb* PORCUPINE BUTTE bpa Sheet 1 byb* beb byb* byb* C 41°30' 245° Sheet 2 bl* bl* bl* bl* bl* bt bt Late Pleistocene B M 115° bls* drs* drs* 100 ka anr* anr* anr* anr* anr* anr* anr* A bu 225° l asm bsc asm rng* asr* asr* asr* asr* asr* asr* bnf bsl bsl bsl aac* aac* AREA OF MAP brh brh awl awl bac bac bac bac mnm mnm mnm as bpw as mel mhi mhi bts bts men* men* bnp bnp mfh* mfh* m1 132 ka 121° 45’ 41°15' bdp 121°45' awb awb ama bng bng bnb 190° 41°22’30” 41°22’30” muc a1 aug aug m16 awf blh* Base from U.S. Geological Survey 1:24,000-scale quadrangles: Captain Jacks Stronghold, Red 155° aut aut m2 m2 Rock Lakes, 1985 (provisional eds.); Bonita Butte, Copic, Garner Mountain, Little Glass Mountain, g bdb* bdb* bnw Schonchin Butte, Sharp Mountain, Tulelake, 1988 (provisional eds.); Border Mountain, Hambone, Horse Peak, Snag Hill, 1990 (provisional eds.); Caldwell Butte, Egg Lake, Hollenbeck, Kephart, Medicine Lake, Mount Dome, Perez, Porcupine Butte, The Panhandle, West of Kephart, White msc msc Horse, 1993; East of Pondosa, Indian Spring Mountain, Timbered Crater, 1995 121° anh anh 22’ Lambert Conformal Conic projection 30” B bcb b4 A bei msp* msp* bwd adh* b9 121° mes mrs 190° 30’ aeg aeg aeg aeg btw ds* M b5 bco A ay mug* mug* mug* mug* m10 b6 bse 121° 155° bpb bpb m12 m12 a3 m9 m14 37’ 30” mdp mdp a5 a5 m7 m11 m11 bdc m5 bdc acc mwg mwc bcu m3 mhm mhm bgf mni bph bph asn bnr bwl 15° SCALE 1:50 000 Geology by J.M. Donnelly-Nolan 1979-1992 180 ka dta* dta* dta* dta* dta* dta* dta* dta* dta* 1 1/2 0 1 2 3 4 MILES Digital database and cartography by D.W. Ramsey, T.J. Felger, E. Lougee, and P. Bruggman 3000 0 3000 6000 9000 12000 15000 18000 21000 FEET dls* dls* bst bst QUATERNARY CALIF. Edited by Taryn A. Lindquist; digital cartographic production 1 .5 0 1 2 3 4 5 KILOMETERS by Kathryn Nimz bsp TRUE NORTH mrc mrc dec* dec* dec* mtc deg* MAGNETIC NORTH Manuscript approved for publication June 20, 2006 APPROXIMATE MEAN CONTOUR INTERVALS 5, 10, 20, AND 40 FEET MAP LOCATION DECLINATION, 2010 SUPPLEMENTARY CONTOUR INTERVALS 5, 10, AND 20 FEET mbp mbp mbp mc mnd a2 awh awh awh mph mph asc asc a4 beg b12 bsh a9 dac mwd a8 m19 m19 a7 LIST OF MAP UNITS b14 a6 [Map units are divided into surficial deposits, volcanic rocks, and units older than Medicine Lake volcano. Surficial deposit units are listed alphabetically by unit symbol. Volcanic rock units are subdivided into compositional b13 b15 categories, as indicated by first letter of unit symbol (b, basalt; m, basaltic andesite; a, andesite; d, dacite; r, rhyolite); within these categories, units are listed alphabetically by unit symbol; isolated cinder cones are shown with MAYFIELD anl anl anl stipple pattern; units that were erupted since last glaciation are shown with random "v" pattern. Units older than Medicine Lake volcano are subdivided into surficial deposits and volcanic rocks; within these categories, units are b11 msn m18 bss listed alphabetically by unit symbol. Sector letters indicate location of unit on map; see "Sector Location Map" for approximate azimuths of sector boudaries; see "Correlation of Map Units" for relative ages of units within each mtr mtr b17 sector. Argon-dated units are shown with asterisk (*); see "Description of Map Units" (in accompanying pamphlet) for complete unit descriptions and unit ages; see also, table 1 (in pamphlet) for argon ages] bh SECTOR(S) FAULT mlc SURFICIAL DEPOSITS bnb Basalt north of Burnt Lava Flow (middle Pleistocene) M m17 Basaltic andesite cone northeast of Cinder Cone (middle Pleistocene) B a6 Andesite cone southwest of Fourmile Hill (middle Pleistocene) F rh Rhyolite of “Hoffman flows” (Holocene) J, K, L b10 b10 b8 Middle Pleistocene g Gravel (Pleistocene) All except D, H, K bnf Basalt northeast of Fourmile Hill (late Pleistocene) H m18 Basaltic andesite cone south of Paint Pot Crater (middle Pleistocene) C a7 Andesite cone west of Crater Glass Flow (middle Pleistocene) F rlg Rhyolite of Little Glass Mountain (Holocene) C, D, E, F bet mlh b2 l Lake deposits (Holocene and Pleistocene) All bng Basalt northeast of Glass Mountain (middle? Pleistocene) J, K m19 Basaltic andesite of Six Shooter Butte (middle Pleistocene) A, B a8 Andesite cone south of Little Mount Hoffman (middle Pleistocene) D rmh* Rhyolite of Mount Hoffman (late Pleistocene) J, K dwm b3 p Pumice (Holocene) bel D, E, F, J, K, L bnp Basalt near Paint Pot Crater (late? Pleistocene) C, D mbp Basaltic andesite of Badger Peak (middle Pleistocene) E, F, G a9 Andesite cone southwest of Little Mount Hoffman (middle Pleistocene) D rng* Rhyolite northwest of Glass Mountain (late Pleistocene) K awm awm t Glacial till (late Pleistocene) A, B, C, E, F, J, L, M bnr Basalt north of railroad (middle Pleistocene) A mc Basaltic andesite south and southwest of Caldwell Butte (middle Pleistocene) J aac* Andesite of Alcohol Crater (late Pleistocene) L, M rse* Rhyolite at southeast edge of Callahan Flow (middle Pleistocene) H, I rcg dsk* b1 VOLCANIC ROCKS bnw Basalt north of Whitney Butte (middle Pleistocene) H mcf Basaltic andesite of Callahan Flow (Holocene) G, H, I abl Andesite of Burnt Lava Flow (Holocene) A, M rsl* Rhyolite south of Little Sand Butte (middle Pleistocene) K bp* mnl* mnl* BASALT bp* Basalt of Prisoners Rock (middle Pleistocene) J mdp Basaltic andesite of Doe Peak (middle Pleistocene) B, C acc Andesite of Cinder Cone (middle Pleistocene) B rwc* Rhyolite west of Callahan Flow (middle Pleistocene) G b7 arr b1 Basalt of Hardin Butte (middle Pleistocene) I bpa Basalt of The Panhandle (late Pleistocene) J mel Basaltic andesite east of Little Glass Mountain (late? Pleistocene) D adh* Andesite near Devils Homestead (middle Pleistocene) H UNITS OLDER THAN MEDICINE LAKE VOLCANO m17 mj b16 b2 Basalt cone at northeast edge of Sharp Mountain (middle Pleistocene) F bea bea bpb Basalt of Porcupine Butte and Timber Hill (middle Pleistocene) A, B men* Basaltic andesite of Eagle Nest Butte (late Pleistocene) H, I aeg Andesite east of Grasshopper Flat (middle Pleistocene) B, C, D, E SURFICIAL DEPOSITS mrr* mrr* m4 b3 Basalt cone at east edge of Sharp Mountain (middle Pleistocene) F bph Basalt of Papoose Hill (middle Pleistocene) A, B mes Basaltic andesite of East Sand Butte (middle? Pleistocene) K ael Andesite east of Lost Spring (middle Pleistocene) C og Older gravel deposits (middle and early Pleistocene) F, G 41°15’ 41°15’ m6 b4 Basalt of Caldwell Butte (middle? Pleistocene) J bpw Basalt near Pumice Stone Well (late Pleistocene) E mfh* Basaltic andesite of Fourmile Hill (late or middle Pleistocene) F, G aes* Andesite east of Six Shooter Pass (middle Pleistocene) F, G ol Older lake sediments (middle and early Pleistocene) G atm* atm* b5 Basalt cone southeast of Mammoth Crater (middle? Pleistocene) I VOLCANIC ROCKS m8 brf Basalt of ribbon flows (late Pleistocene) M mgf Basaltic andesite east of Grasshopper Flat (late Pleistocene) C aet Andesite east of Typhoon Mesa (middle Pleistocene) D m15 mtl mtl oag Older andesite of Garner Mountain (middle Pleistocene) E b6 Basalt cone at southeast end of Hidden Valley (middle Pleistocene) I brh Basalt of Red Hill (late Pleistocene) B, C mhi Basaltic andesite of Hippo Butte (late Pleistocene) H, I afr Andesite of Fisk Ridge (middle Pleistocene) C, D afr afr oap* Older andesite of
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