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Sim Kellogg Sheet2 CC U.S. Department of the Interior Scientific Investigations Map XXXX U.S. Geological Survey Sheet 2 of 2 Pamphlet accompanies map CORRELATION OF MAP UNITS LIST OF MAP UNITS UPPER EOCENE VOLCANIC ROCKS PROTEROZOIC ROCKS OF BUFFALO PEAKS CENTER INTRUSIVE ROCKS [As used in this report, the terms “stream alluvium” and “fluvial deposits” refer to SURFICIAL DEPOSITS an Andesite sediment transported by running water confined to channels, whereas the terms “sheet- Yla Lamprophyre and andesite dikes (Mesoproterozoic?) wash alluvium” and “sheetflood alluvium” refer to sediment transported by running water vb Volcanic breccia MASS- YXp Pegmatite (Mesoproterozoic and Paleoproterozoic) not confined to channels. The terms “colluvium” and “mass-movement deposits” refers to EOLIAN MOVEMENT tu Upper tuff rock and sediment transported downslope chiefly by gravity. Map units that include Granitic rock, undivided (Mesoproterozoic or Paleoproterozoic) ALLUVIAL AND MASS- AND AND (OR) YXgr debris-flow deposits, such as some of the surficial map units in the map area, probably a Air-fall and ash-flow tuff ANTHROPOGENIC GLACIAL MASS-MOVEMENT MOVEMENT ALLUVIAL GLACIAL WETLAND YXhm Hornblende monzodiorite (Mesoproterozoic or Paleoproterozoic) also include hyperconcentrated-flow deposits. These latter deposits have bedding and DEPOSITS ALLUVIAL DEPOSITS DEPOSITS DEPOSITS DEPOSITS DEPOSITS DEPOSITS DEPOSITS la Lahar deposit sorting characteristics intermediate between those of stream-flow and debris-flow YXhd Hornblende diorite (Mesoproterozoic or Paleoproterozoic) deposits. tl Lower tuff Ygdh Granodiorite of Mount Harvard (Mesoproterozoic) afpt mw ss Qa In descriptions of surficial deposits, the term “clasts” refers to granules and larger bal Basal andesite Qtr Qw Qp Qr particles (>2 millimeter per year [mm] in diameter), while the term “matrix” refers to Ygl Langhoff Gulch Granite (Mesoproterozoic) sand and finer particles (≤2 mm in diameter). The terms “soil” and “soils”, used in this TERTIARY AND Yglf Strongly foliated facies ? report, refer to pedogenic soils formed in surficial deposits. Soil-horizon designations are LATE CRETACEOUS INTRUSIVE ROCKS Qpf Qf those of the Soil Survey Staff (1999) and Birkeland (1999). All colors for soil horizons, ROCKS ASSOCIATED WITH Yge Elephant Rock Granite (Mesoproterozoic) Qgp Qtp sediments, and bedrock in this report are informal field designations] Qpfo EARLY RIO GRANDE RIFTING Ygef Strongly foliated facies Qac Qc Qt Qes SURFICIAL DEPOSITS Late rhyolite porphyry dikes and plugs of Mount Princeton region (late rp Yhy Hybrid mix of Langhoff Gulch Granite and Elephant Rock Granite ANTHROPOGENIC DEPOSITS Oligocene) (Mesoproterozoic) l Olivine-augite lamprophyre dike (late Oligocene?) Ybp Browns Pass Granite of Fridrich and others (1998) (Mesoproterozoic) Qgby Qls af Artificial-fill deposits (latest Holocene) dt Microtonalite (Oligocene?) Qgb ? Qtb QUATERNARY pt Placer-tailings deposits (latest Holocene) Ygrg Granite of Granite (Mesoproterozoic) Qfo Qd Pleistocene rc Hypabyssal rhyolite of Clear Creek (late Oligocene) Qgbo mw Mine-waste deposits (latest Holocene) Ygdm Granodiorite of Mount Elbert (Mesoproterozoic) ? ? ? ? Leucogranite Suite of Mount Antero ss Smelter-slag deposits (latest Holocene) Yqd Quartz diorite (Mesoproterozoic) Qg4 ar Rhyolite dike (early? Oligocene) ALLUVIAL DEPOSITS Ygm Granite of Music Mountain (Mesoproterozoic) Qapb ap Border phase (early Oligocene) Qg3 Qgpb Qpbf Qa Young stream-channel and overbank alluvium (Holocene) Ygs St. Kevin Granite (Mesoproterozoic) ag Main phase (early Oligocene) Qtpb Qgp Outwash gravel of Pinedale glaciation (late Pleistocene) Xgk Kroenke Granite (Paleoproterozoic) Qg2 cg Leucogranite of the California Mine (early Oligocene) Qpf Younger flood gravel and channel deposits of Pinedale glaciation (late Xgy Granite of Mount Yale (Paleoproterozoic) ? ? BASIN-FILL Pleistocene) PRE-RIFT INTRUSIVE ROCKS Qg1 ? DEPOSITS Qpfo Older flood gravel and channel deposits of Pinedale glaciation (late Xdi Diorite (Paleoproterozoic) Granite and granite dikes of North Fork (early Oligocene) QNg Pleistocene) nf ? Xgd Henry Mountain? Granite (Paleoproterozoic) Qgb Outwash gravel of Bull Lake glaciation, undivided (late and middle qmd Quartz monzodiorite (early Oligocene) Nda Xdk Nd Pleistocene) Denny Creek Granodiorite (Paleoproterozoic) Pliocene tm Porphyritic latite dike of Shannon (1988) (early Oligocene?) Ndc Qgby Younger outwash gravel of Bull Lake glaciation (late and middle? and Neogene Xgdm Granodiorite of Methodist Mountain (Paleoproterozoic) Nds Miocene Pleistocene) Rocks of The Mount Aetna Caldera TERTIARY AND LATE Qgbo Older outwash gravel of Bull Lake glaciation (late? and middle (Early Oligocene or Late Eocene) Xgg Foliated granodioritic augen gneiss and granitic gneiss (Paleoproterozoic) CRETACEOUS INTRUSIVE ROCKS Pleistocene) Nb Quartz latite porphyry ring dike Xlg Leucogranite gneiss (Paleoproterozoic) Outwash gravel of pre-Bull Lake age (middle and early Pleistocene) ma OLIGOCENE AND EOCENE VOLCANIC Xgb Gabbro (Paleoproterozoic) ROCKS ASSOCIATED ib Intrusive breccia AND MIXED VOLCANIC, VOLCANICLASTIC, Qg4 Outwash gravel of pre-Bull Lake age, level 4 (middle Pleistocene) WITH EARLY RIO GRANDE RIFTING PALEOPROTEROZOIC ROCKS OF THE AND SEDIMENTARY ROCKS m Monzonite and latite dikes (early Oligocene or late Eocene) ? ? Qapb Gravelly stream alluvium of pre-Bull Lake age (middle Pleistocene) GUNNISON-SALIDA VOLCANO-PLUTONIC BELT l dt lw Late white porphyry (late Eocene) bf rp rc Qgpb Outwash gravel of pre-Bull Lake age, undivided (middle and early? VOLCANIC ROCKS ? ? Xgs Metagabbro of the Gunnison-Salida volcano-plutonic belt Leucogranite Suite of Mount Antero Oligocene Pleistocene) lu Little Union Quartz Latite (late Eocene) ASSOCIATED WITH EARLY nr Xba PRE-RIFT Qg3 Metabasalt ar ap ag Outwash gravel of pre-Bull Lake age, level 3 (middle Pleistocene) RIO GRANDE RIFTING cg Rocks of the Mount Princeton Batholith nt ? INTRUSIVE ROCKS Xvs Metavolcanic rocks, metasedimentary rocks, and metagabbro sills, Qpbf Flood gravel of pre-Bull Lake age (middle Pleistocene) mp Granitic rock of Mount Princeton batholith, undivided (late Eocene) undivided qmd Qg2 Xms bt Rocks of the Mount Aetna Caldera nf Outwash gravel of pre-Bull Lake age, level 2 (middle or early Pleistocene) bqm Aluminous gneiss and schist, calc-silicate gneiss, and quartzite tm Boulder Mountain monzogranite porphyry of Shannon (1988) (early Qg1 Outwash gravel of pre-Bull Lake age, level 1 (early Pleistocene) Oligocene or late Eocene) Xmc bc rd ? ? Muscovite-cordierite schist ib QNg mpf Finer-grained facies ? ma Very old alluvial gravel of Arkansas River (early Pleistocene? or INTERMIXED METASEDIMENTARY tc ab m lw TERTIARY Pliocene) mpk Alkali-feldspar monzogranite AND METAVOLCANIC ROCKS ? rs lu GLACIAL DEPOSITS mpm Equigranular biotite-hornblende monzogranite interior facies YXm PRE-RIFT VOLCANIC, Rocks of the Intermixed metasedimentary and metaigneous rocks (Mesoproterozoic ? ? Qr Rock-glacier deposits (early Holocene and latest Pleistocene?) VOLCANICLASTIC, AND Mount Princeton Batholith and Paleoproterozoic) cn Paleogene mpp Augite-bearing granodiorite porphyry SEDIMENTARY ROCKS Till (late to early Pleistocene) Xb Biotite gneiss mpb Border phase Eocene and Xhc Hornblende gneiss, amphibolite, and calc-silicate gneiss wm UPPER EOCENE bqm mpf mpk mpm mpp Qtp Till of Pinedale glaciation (late Pleistocene) Eocene and Paleocene mp Paleocene Intrusive ? VOLCANIC ROCKS OF Intrusive Intermediate and Felsic Rocks Xhg Hornblende gneiss and amphibolite tr mpb Intermediate and Felsic Rocks Qtb Till of Bull Lake glaciation (late and middle Pleistocene) sb BUFFALO PEAKS CENTER Eocene ? ? ? ai Intrusive andesite (late Eocene?) an Qtpb Till of pre-Bull Lake age (middle and early Pleistocene) ra cr ql va vb tu ? ? ? ALLUVIAL AND MASS-MOVEMENT DEPOSITS gp Gray porphyry group, undivided (Eocene or Paleocene) la a ai Qf Fan deposits (Holocene and late Pleistocene) gj tl Johnson Gulch Porphyry (Eocene) bal a ? gj gs er Qac Alluvium and colluvium, undivided (Holocene to middle? Pleistocene) gs Sacramento Porphyry (Eocene) Regional ? md Qfo Old fan deposits (late and middle Pleistocene ) er Eagle River Porphyry (Eocene?) Paleogene And wf di Late Cretaceous Rocks ? MASS-MOVEMENT DEPOSITS gl gl Lincoln Porphyry (Eocene or Paleocene) gp Qc Colluvium (Holocene to middle? Pleistocene) ? di Diorite of Buckskin Gulch (Eocene? or Paleocene?) gt Qt Talus deposits (Holocene to middle? Pleistocene) ? ? ? Paleocene Km tlg wf Felsic plutons and dikes of Fridrich and others (1998) (Eocene) Qls Landslide deposits (Holocene to early? Pleistocene) md Monzodiorite porphyry (Eocene?) Kdi Kwg EOLIAN AND ALLUVIAL DEPOSITS Kw Kd Late Kad Cretaceous CRETACEOUS Qes Eolian sediments and alluvium, undivided (Holocene to middle? Regional Paleogene and ? ? ? ? Pleistocene) PALEOZOIC SEDIMENTARY ROCKS Late Cretaceous Intrusive Rocks Unconformity MASS-MOVEMENT AND (OR) GLACIAL DEPOSITS gt Granite porphyry of Tumble Hill (Paleocene) Qtr Talus and rock-glacier deposits, undivided (Holocene and late tlg Twin Lakes Granodiorite (Paleocene) PERMIAN Pleistocene) Lower Permian Figure 9. View to north of Buffalo Peaks, which are composed mostly of Pm Qd Diamicton (Pleistocene) Early white porphyry group (Paleocene or Late Cretaceous) Upper Pennsylvanian Kw andesite flows, andesite breccias, lahars, and welded tuff deposited on WETLAND DEPOSITS Kdi Diorite sill (Paleocene or Late Cretaceous) Mesoproterozoic granite. The peak on the left is West Buffalo Peak (4,062 m; Qw Wetland
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