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Sheet 1 of 2 U.S Scientific Investigations Map 3123 U.S. Department of the Interior Sheet 1 of 2 U.S. Geological Survey Pamphlet and CD-ROM accompany map 107° Iris NW (IW) 38°30' 106°52'30" Iris (IR) Gunnison River follows old paleovalley 106°45' that localized Tws deposition Tfcn Houston Gulch (HG) Tfcn Tcv 106°37'30" Doyleville (DV) Jm QTg Tws p_g 106°30' Sargents (SS) QTf Qc Qal Twsn Tcv Tfc p_m 106°22'30" Tsc Twsn p_m Tfc Tfc 38°30' Qc Jj Qc Tcuv Twsn Twsn Jm Jj Tcv Jj Tfc Tsc p_m Qc Tev Ql Tcr Qc QTg Qc p_g Kd QTg Tev COCHETOPA-NORTH PASS CALDERA MAP AREA BONANZA CALDERA STUDY AREA Tfc Kd p_g 38°30’ Twsn Tfc p_m Qc Jm Twsn p_g Jm Gunnison, QTf Tcr p_m Tfc Gunnison, sheet 5 Chaffee QTf p_m Jm sheet 4 QTf p_m Jj p_g Jm Jj Qt Qc Km Iris NW Iris Houston Gulch Doyleville Sargents Pahlone Peak Mount Ouray Poncha Pass Tcv Jm (IW) (IR) (HG) (DV) (SS) (PP) (MO) (PO) Qc Qc Qc Jj Jj Tfcn Jj Tcv Ql Olson, 1976c Olson, 1976b Olson, 1976a Tfc Tcv Saguache, sheet 2 Qc Tsc Tfc QTg Jm Qc Kd Ql Jm Tsc Km Sawtooth Razor Creek Qc QTf Tcr Ql Spring Hill Mountain (ST) West Baldy Sargents Mesa Chester Bonanza Whale Hill Qc p_g Kd Dome (RD) Qc Creek (SH) (WB) (SM) (CH) (BZ) (WH) Tcv Jm Jm Kd Bonanza Qc Ql p_g Hedland and Olson and Olson and Olsen, 1974 Steven, 1976a Steven, 1976b Saguache, sheet 1 Tfc Tcv Tcv Tfc p_g Caldera p_m Twsn Tfc Km Jj Km Cochetopa Park Tfc Tfc Jm Tcv Caldera Qc Qc Twsn Qc Tcuv Qc Rock Creek Cold Spring Cochetopa North Trickle Lake Mountain Klondike Mine Graveyard Gulch p_m Qc Park Park Park Pass Mountain Northeast (KM) (GG) Tfcn QTf Tws Jj Tcv Kd Tfc p_g Jj Jm Kd (RC) (CS) (CP) unmapped(NP) (TM) (LMNE) p_m Ql Tfc NP Jm Tfcn Tcv Jj Tcuv Tcv Kd Tcuv Tfc Jm Caldera Mesa-capping Tfc Qc Tcv Jm Tsc, at higher Qt Jj Tfc Tfcn Qc elevations than Qc younger Tfc Twsn Jj Tfcn Qc Tfcn Tcv Modern canyon at Qc Tcv Qc Iris NW (IW) Iris NW Tfcn Tsc Jj Tcv Qt Tcv right angle to volcanic-filled Tsc Kd Stewart Peak Elk Park Saguache Park Grouse Creek Lake Mountain Laughlin Gulch Saguache Hickey Bridge paleovalley Tcv (SP) (EP) (SA) (GC) (LM) (LG) (SG) (HB) Tsc unmapped N-trending post- Tscl QTg Qc Qal Tws paleovalley, Saguache, sheet 3 Saguache, sheet 4 (SS) Sargents filled with Tfc QTf Jm Qc Tcv? Jj Thick mesa cap of Tsc, previously Qc Tcv 38° Kd Tcv mapped as tuff of 107° 106° Cochetopa Creek Qal Tca Ql Tsc Tfc MAPPING CREDIT Tcv Jm CENTRAL SAN JUAN MAP AREA p_g Tcv Ql Ql p_m Tsc (Lipman, 2006) Paleohill capped Km Tfc by Tsc, abutted Tcv Ql by Tfc Km Km Jm Twsn Tbc Qc Ql Tcv Tcv P. Lipman, P. Lipman, Pre-Tertiary geology modified Tbc Qc Tws Steep Tsc Tfc Km 2000–2007 1986–89, 1995–99 from published USGS maps Tfc Tsc Km Tsc unconformity, Tsc Qc Tscn (J. Olson and others, 1974–76) Qc Jj Kd Jm Tfc against Tws Qc In-place Tbc directly on Pzl, Tcv Figure 3. Northeastern San Juan region, showing areas of geologic mapping responsibilities, 7.5' topographic quadrangles (black lines), abbreviations just east of map Qc Kd Tcv Qf Tcv Qc Jm Jj Tscl Ql used on maps and in text, and 1:50,000-scale county maps (blue dashed lines and labels). Published USGS 7.5' geologic map quadrangles indicated by p_g Qfo citation below quadrangle name and abbreviation. In-progress study of the Bonanza caldera, east of this map area, provides documentation for some Qc High-standing Complex slumping paleohill of Tsc, Tsc on underlying p_g features referenced in this report. Qal abutted by Tfc Qc Mancos Shale (Km) Tfc Km Tcv Km Tbfa Jj Ql Tca Jm Tcv Tcv Qc Tca Tfcn Tcap Jj Tfc Tcd Qc Km p_m Ql Qc Tfc Tcv p_g Km Tca Km Tca Tcd Tca Ql Tcv Km Tfc Tca Jj Jm Tca Kd Qc Qc Ql Qc Tfc Qc Tcv Km Tbfa Km Ql Km Km Qf Qal Tca Tca Tfc Ql Kd Ql Qc Tca Jj Tca Tfc N-trending dikes, Kd similar in composition Tca Concentrated Tcap boulder float of Qc and age to Needle Cr 33.60± Pzl; no outcrop 15 Tbfa intrusion 0.09b Tci |l Qc 38°22'30" 32.27± Tsc Tbfa Tci Tcap 0.05 p_m Kd Tfc Qt Tcfr 5 34.28±0.18h Tcd 25 Large (to 0.5 m) Tbfc Tct Tca Qc 33.67± 32.29±0.05 pumice blocks p_g Km Tcv Ql Tcv Tcv 0.19b in Tscn Qc Tsc Tbfc 25 Qc 38°22'30" Ql 5 Ql Jm 29.85±0.04 Tcd Tca Jj Jm Jj Tfc Ql Tbfa Tcv QTg Jm Kd Km p_g Tev Qc Jj Jm Qc Tca Ql Tcv Tcd Tscn Jj Tca Tcap Kd Tfc Tcr Tca Qc Multiple ages p_g p_m Kd Qc (29.8, >34 Ma) Ql Km Km Ql of Tcfr? p_m Jm Tcv Tws? Tbfa Qc Tfc Tca Tev QTl Qal p_m Kd Km 29.63±0.06 Km Qc Km Qc Km p_g QTg? Tca Tcfr Tfc Tca Jj Qc Qlo Tfc Ql Ql Km Tcv Twm Jm Tsc Jm 34.39±0.23h QTg? Large blocks Tcr p_m Tcv Jj Tci (to 10 m), both Qc Jm Ql Tbd and Tsc Tca Low Jj Tbfc Tct Tct Tcv Thb? Tcv paleovalley Tcd Tcd Tci fill of Tbd Jj Ql p_g Tca Kd Abundant basalt Tcv Qc Qc Tcfr Qc Tfc Twsn Tcv fragments in 29.79±0.05 Tci Tfc Twm 27.14 rhyolite plug Tcv Tcv ±0.05 Qc Angular Tfc 20 Km Qc Qc 60 Tct Tca andesite Qc Kd Km Tbfc Qc Tcfr QTl Ql Qc Jm Jm Ql QTg? breccia Tcd Jj Twsn Kd Tcdi Ql Angular Qc Kd 27.08±0.05 Ql Qc Ql Tct andesite Tbrl 33.18 Tcv ±.06 Qc Qc Jj 34.42 Qc breccia Ql Tcv Tca ±0.21h Tcv p_m Qc Tca p_m p_g Qc Tcfr Tcd Coarse Tbd Tcv conglomerate, 33.19 Tscn Jm Tcv Qc Tct ±0.05 Tcv Km 33.98 Tca =g and Tca Tca 36.95±0.15gs, Qal Tca Tbfc Tir ±0.08 Qc boulders Tba? Tbd Tca 36.85±0.07 Km Tbfc Tbfc Tbrl Jj Tcv Qal Qc Ql Tct Tcd Twsn Thb? Km Tcfr Qc Tcv Thb? 20 Kd Qc Tca Qc Tcd Qc Tbrl Qal Tcv QTl Tbd Tbfa Jj Jm Tscn Twm Jm Kd Tcfr Qt Twm Qc Qc Ridge-capping Kd Twm Jj Ql Tci andesite; tentatively Tcdi Km Tca Qc 34.10±0.05 Qc Tbd 10 Qc Tbfa NEEDLE CREEK INTRUSION Tca Tca Thb (Olson and others, 1975) Jj Jm Tbfa Tca Qc Qc Jj Tbfa Tca Qc Tcv 30.08 Tcd Qc Twm Km Tca ±0.09 Tcfr Ql Tca? Tcfr Tbd Tfc Ql Tscc Tcv Tsc Jm 15 Qt Qc Kd Jj Tcv 20 Tca? Scabs of Tbd, Tcv Tcv Jm Kd Tca Tcfr banked high Tba Jj Tca Tcv Tca Km Tfc Tcv Km Tcv Tcd Qc on paleovalley Qc Tba Poorly exposed Ql Qc 29.83 wall 20 Tbd Qt Jm Tcv p_g Tca Qc ±0.05 Qc Tsc, seemingly Tca Tcfr Ql Tca Tfc overlain by Tca? Rheomorphic ramp Tcfr Tca Twm Ql structures in mesa- Qc Tid? Jm Tscn Tcv Jm Tci Qm Tca Jj capping Twn Qlo Tid? Ql Tcv 30 Ql Qc Tcv Tca? Qt Tbd Tcv Kd Qc Qc Tca Jj Outer caldera Tcv Alternatively, thick Ql Kd Jm fault(?); only Tcv Qc Km Qc Qm Tca Tca Tcv valley-filling lava Qc Tcd Tia Kd Tca modest dome? Jm Kd Qc Tcfr Tbd displacements 10 Tcr Tcfr Twm Kd Tfc Tcd 5 Tcv Jj Tca Km Tcv Tpcf Tca Tca Tca Tbfa Qc Jm Tca QTg? Tia Ql Jm Qc 5 Tcfr Tid Spring Hill Creek (SH) Tcv Tcd 15 Qc 5 Qt Qc Qc Tca Tbd Qc Tscl Twm Tpba? 5 p_g Tcd Qc Jj Kd Tpcf 30 Tcv 30 Qc Qc Qc Tca Tcv Kd Tcv Jj Slumped Tbd Qt Kd 15 40 Tcv Ql Tcv Tcht Tcht 15 35 Tca Tci Tbd Qt Mesa (SM) Sargents 25 Qc 33.01±0.10b Qc Kd Qc Tcv Qc Long Branch Ql 35 Jm Tpba Tca intrusion (at roof 32.98±0.21h Km 32.26 Qc Tpcf Qc Ql 5 25 Jm Qgo 5 Qc level) Tca ±0.07 25 Tcht Qc Tcfr Tca Qm 15 25 Tpba Qc Qc Tcfr Tcv Qc 70 Tca Tcv Kd Tbrl Tid Tca Tscn Tcfr Jj Tca Tpba Tca Tca 15 Qc Tca Qc Jm Tcht 40 20 15 Tca Qc Tcfr Tpcf 5 Tci Ql 50 45 25 Tpba 10 Qt 65 30 37.13 5 Tbd Tca 20 ±0.09 10 Qc Qc 381 Tcht Tcv Tca Tcd 50 10 Tcv Tcv Tca p_g Tci Km ±60 Qc Ql Qc Ql Tca 5 Kd 25 Tcv p_g Qc Qc Twsn Tcd Tcfr Tcv 10 Slumped SAWTOOTH Jm Qc 35 Tcd 10 Tcd Tca 20 brecciated slabs MOUNTAIN 60 Qc Coherent outer Tcfr Tpba Tcr Tca Kd p_g of andesite INTRUSION Ql caldera floor, and Tca Tcfr 30 Tpba Tca Tcv Qc Tca Tcv Jm Twm (or) downsagged 34.61 Tpcf Tcht Tci Tfc Tbd Jj ±16h caldera margin? Qc 10 Qt Qt Qt Qc Tws Tcv Ql Tca 20 Tca Tca Tcht Tcv Qc Tca? Tcdi Jj Qm Slumped Tpba Tca Tcv brecciated Ql Tca Tcd Jj Jj Tfc Tca slabs of Tpcf Qc 27.07±0.06 Qc 10 Tcfr andesite Tcv Tcht 25 Tcfr Qc Tcd Tcfr Qc Ql Tpbf Clasts of Tbrl Qc Tci Qf Qc Qc Deep Precambrian Tcv paleovalleys Tca rocks to Qal Qc 50 Qc Tpcf fill of Tbd Twsn Tws Tca Tcv Tfcn Tcv 0.5 m, in 55 unit Tcht Tpba? Tca Tpbr Ql Tcv 15 32.00+0.09b Tci Qgo 60 Tpba Tfcn Tpbr? 25 p_g Qc Tpba Tca 15 Tpba 20 Qf Jj Qc 20 Qg Qc Qc Tcv Qc Tca Broad paleovalley Tpbs Conspicuous knob: unclear Tpcf fill (Tfc, Tcr) Tcd Tscn Tpba Qt Qc Qc whether Tpbf or in-place Tca Tcfr Kd Tca Tpcf Tpff Qm Tca Ql Deposition of Tca Ql Tci Tci Qf brecciated Tfc? Tcd Tcv thick-welded 50 Ql Tca Tbd Qc Ql 25 Tfc Tws controlled Qc Tcv Tcv Tca Tscn Tcr Kd Jm Kd by N-trending Tpcf Tpt Tpt Qc Tpba Tpbf Tcfr Tcv paleovalley Tpcf Tsc Tcfr Tcv Tpbm Tcfr Qc Tcd Tcd Qfo Tcv Jj Qc 5 Tca Tbd Tca Tca Tfc Tpbf Qc Tcv Tpba Qg Tcfr Ql Tws Qc Tpt Tscn Tcfr Tcv Tcfr Tca Tfc 35 45 Tpbf p_g Tfc Qc Tcv Qc 20 Tpt Tcfr Tcv Jj Tca Tca Tpcf 80 Tpt Tpcf Tscn Tcd Qc 80 55 Qfo Tca Tpcf? Qc 38°15'30" Ql Tpt 50 Qf Qc Qc 70 Tcd Tcr Qc Qc Tpcf Tpba Tca 32.40±0.05 Ql Tcv Tpt 10 50 Tpt Tca Tcfr Tca Tcdm Tts Tws Tcd Qc Qfo Qc Tcv Tcfr Tca 60 20 Tcd Tfc Rheomorphic Qf Tpcf 5 Tpt 75 Qf Tpff Tpba Tca Tpbd Qf Tpt Tts, banked Tcv 38°15'30" Tca Qc Qc Qt Tcdu Qt against steep Tts Ql Tbd Qc 50 Qc Qc Qc Tcv Tca Tcsa Qg Near-vertical paleotopo- Tcv Qc 30 Tpt Tca 20 ramp structures, Meter-size graphy May include 20 Qc 10 20 Tpbf Tcd Tscl Megablock near top of blocks of Tcr Tpba? some slumped Tcd 32.55 Qc Qc 40 Qt 70 ±0.05 Tcfr slabs of Qf Tcdm flow 50 30 in landslide Tfc deposit Tpbm Tts Tca Tfc Tcv dacite 45 45 5 32.14±0.05 Tlr Tca Tbd 25 15 Tbd Tcd Ql Qg 60 20 Qc Tca Tcv 30 85 Tcd 32.07±0.17b 32.48±0.05 25 Tsc Tscl Tcd Black obsidian 45 40 20 Tca Qt 25 5 20 80 Tcv Tst? 30 Tpt Qg nodules (Apache 25 50 Tca Tpt 60 30 65 10 tears) in Tcdu Tpt Qf Tpcf 20 Tpbm Tcv Tcfr Tca basal perlite 5 Qt Tcdm 40 50 15 Tpcf 45 5 20 65 Tcdx 27.48 Tcd Tscl 5 ±0.05 Tca Tcv Tpbf 75 5 Qc Tci Tca Tcv Tfc Tcdm Tcd Tcv Tcv Tcfr Tcfr 20 Qc 15 20 Tca Paleolandslide of Tsc Tsc Qc Tpt 50 Tca Tca Tnpd Tsc Tcv Qgo 45 Tcdu 45 Tpt Tst into same valley as Tsc Qt 30 Tbd Tca 40 Tct Tsc earlier localized Tbd 35 Tsc Tca Tpcf Qal Qc 40 20 50 Tpbf 26.91±0.20ob 5 50 Tnpd Tcr 45 Topographically
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