Document 10907317
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NEW MEXICO BUREAU OF GEOLOGY AND MINERAL RESOURCES 107°45'0"W 245000 246000 NMBGMR Open-file Geologic Map 229 Last Modified January 2013 A DIVISION OF NEW MEXICO INSTITUTE OF MINING AND TECHNOLOGY 247000 107°42'30"W 248000 249000 250000 107°40'0"W 251000 252000 254000 253000 256000 255000 g g g g g o Tirp o o o Tirp g g o Qsa o o g 31 Tia Qayh 34 Pa 35 o Qayh o Qao2 Trp g g Qao2 o o Tia Qayh Qao1 Trrc Qao2 20 Qah Qah g g af af Qao2 Qayh Qao3 Tkn 3697 000 Qao2 g g g g g o o g o Qao2 Tvt Qagf ȱ ȱ ěȮLight-gray to gray to tan to pink, poorly-to moderately-welded, ¢ȬȱȬĚ ȱěǯȱŘŖ–ŚśƖȱ¢ȱȱĵǰȱǰȱǰȱȱǯȱ ¢ȱ£ǰȱ ȱȱȱĵȱȱȱȱȱǰȱȱȱȱ biotite toward the top. Erupted form the Emory caldera, SSW of the quadrangle; single-crystal sanidine ŸŴAr/ŷŽArȱȱȱřśǯřŚƹŖǯŗŖȱȱǻȱȱǯǰȱŗşşŗǼǯ ěȱ¢ȱȮȱȱ ǰȱęȬȱȱ Ȭȱȱȱĵȱ ȱ ǯȱ ȱ ȱ ¢¢ȱ ȱ ȱ ȱ ȱ ȱ ĵǰȱ sanidine, plagioclase, and minor biotite. Includes purple to blue-gray siltstones, and a basal conglomerate. Poorly-consolidated and exposed. ěȱ ȱ ȱ ȱ ¢ȯModerately-to poorly-welded, moderately-crystal-rich ȬĚ ȱěǯȱŗŖ–20% phenocrysts of subequal sanidine and plagioclase, and 1–2% biotite. Common small (1.5–Řȱ ȱ Ǽȱ ęȱ ǯȱ ȱ ȱ ȱ ǯȱ ȱȱȱȱȱŚȱěȱ¢ȱȦȱȱȱȱDzȱȬ¢ȱȱ ŚŖȦřşȱȱȱřśǯŚŗƹŖǯŖŞȱȱǻȱȱǯǰȱŗşşŗǼǯ ěȱȱȱȮModerately-to densely-welded, lithic-rich, pumice-rich, crystal-poor ȬĚ ȱěǯȱȱȱŗŖƖȱ¢ȱȱǰȱǰȱȱǯȱŘŖ–40% subangular lithic fragments of red and gray-black aphanitic lavas, up to 6 cm across. May correlate to the ěȱȱȱȱȱȱěȱȱȱȱǻȱȱǯǰȱŗşşŗǼǰȱȱ¢ȱȱȱȱȱ (Harrison, 1990). As much as 100 m thick. ȱ ȱ ǰȱ ȱ Ȯȱ ƹȱ ȱ ƹȱ ¢¡ȱ ȱ ¢¢ȱǯȱȱĚ ȱ¢ȱȱȱĚ ȱȱȱ ȱȱȱǯ _b ȱ ȮȬ¢ȱ ȱ Ȭ Ȭ¢ȱ ¢ȱ ĵȬȱ ǰȱ ȱ ȱ basal section of oolitic hematite. 38 m thick (Jahns et al., 1978). p_u ǰȱȮȱęȬȱȱ¢ȱȬ¢ȱȱȬȱ to coarse-grained amphibolite (Jahns et al., 1978, 2006). ȱ Tgim ȱȱȱȮȬ¢ȱȱǰȱęȬȱȱĵȬȬȱ ȱ ǯȱ Ȭǰȱ ȱ ĵȱ ȱ ǰȱ ȱ ȱ ǯȱ Coarsest at north end, with crystals just over 1 mm across. Trrp ¢ȱȱ¢ȱȮȱȱ¢ǰȱęȬȱȱȱ¢ȱǯȱȱǻŗşŞŜǼȱ described thin sections with spherulitc to trachytic textures, with plagioclase as the main microphenocryst and accessory biotite, titanite, epidote, muscovite, hematite, amphibole, apatite, and magnetite. Tir ¢ȱ ȮDark-gray ęȬĵȱ¢ǯ Tirp ¢ȱ¢¢ȱȮDark-gray to greenish-gray, weathering pink and reddish-brown, ĵȱƹȱȱ¢ǯȱȱȱȱȱȱȱȱ¢ǯ Tia ȱ ȮDark-green to dark-gray to black, aphanitic to porphyritic, intermediate dikes. Phenocrysts of plagioclase and horneblende. ȱ ȱ ǰȱ ȱ ¢ȱ Ȯȱ Ƹȱ ȱ ƹȱ ¢¡ȱ ȱ¢¢ȱǯȱȱĚ ȱ¢ȱȱĚ ȱȱȱ ȱȱȱǯ to greenish-gray, largely aphanitic dikes. Sparse, Qca, Qsa angular unconformity Andesite of the Winston graben*, 18 Ma (3) Twa Tsfm Lower Santa Fe Group*, includes ȱ¢ȱěǰȱŘŝǯŝȱȱǻŗǼ Tsfl 28.9 Ma (1) Tvp Base of Tvp unexposed here, but is an angular unconformity to the south 29 Ma (2) Tgim Tir, Trrp Tirp Tsp Tpc Tkn Tcc Trrc 35.4 Ma (1) Tvt Ages of large instrustions unknown Trpa, Trph, Trpba Tia angular unconformity Kd (angular?) unconformity Pys Pa m s Mk Mlv Dp Do b u Qay Qao1 275+ m FIGURE 1—Upper Santa Fe Group (Tsfu), derived from the Black Range. Note the relative lack of matrix material, and only local lightening of the gravels by carbonate accumulation. Upper part is moderately bioturbated by Holocene biota. FIGURE 2—View of Iron Mountain (left) and Reilly Peak (right), from the south. Iron Mountain is underlain by Paleozoic limestones and locally sandstones. Reilly Peak is underlain by a rhyolitic intrusion, the Rhyolite of Reilly Peak. Hills in front of the mountains is underlain by Santa Fe Group sediments, mostly derived from the highland in the background, but in part also derived from the Black Range, off photo to the left. FIGURE 3—Upper Santa Fe Group (Tsfu) derived from the Sierra Cuchillo. Note abundance of matrix material and light color, possibly from the presence of carbonate in the matrix. Photo is looking south, and beds dip slightly to the west. FIGURE 4—Buried soils in Qay. Buried soils are marked by the slight darkening of the buried A horizons. Two are readily apparent in this picture. Also note the Stage I carbonate horizon development in lowest buried soil. 53 m 13 m 31 m 2.5 m Thicknesses (meters) from stratigraphic section of Jahns et al. (1978) 2m Sf 1m Om Oe 40 m 54 m 38 m Qagf Qao2 Qah af o Tkn 20 Tcc Tpc o 42 22 o 245000 o Tcc 22 Tcc Qah o Qah Qao2 Tkn 246000 Trrc Qsa Trrc 248000 250000 249000 107°42'30"W 251000 af af Qayh 253000 252000 107°40'0"W Qayh Qayh Qsa Qao2 Tsfu Trrc 247000 Qao2 af af Tcc Tkn Qayh Qagf af Qayh Tcc Trrc Qca Tkn Qayh 5 Qao2 25 (1) 40Ar/39Ar age from McIntosh et al. (1991); ages scaled upwards by 1.3% to ȱȱȱȱȱȱ¢ȱěȱȱȱǰȱȱŘŝǯŞŚȱ to 28.201 Ma (Kuiper et al., 2008) (2) K-Ar age from C. E. Chapin, pers. comm., cited in Harrison (1990) (3) K-Ar age from Seager et al. (1984) (4) 40Ar/39Ar age from McLemore et al. (in press) Qao1 Qao2 Tkn Tpc Tkn Trrc 79 107°45'0"W Tia o 79 af Tsfu Qao1 Qah £ȱ ǰȱ ȮInterbedded light-to medium-gray limestones and medium- to dark-gray siltstones. Commonly highly altered and faulted. Dominantly Madera Limestone, with a sequence of thinner older units apparent in measured section. Includes 54 m of El Paso Limestone, 40 m of Montoya Formation, 1 m of Fusselman Formation, 2 m of Oñate Formation, 2.5 m of Percha Formation, 31 m of Lake Valley Formation, 13 m of Kelly Limestone, 53 m of Sandia Formation, and at least 275 m of Madera Limestone (Jahns et al., 1978). Oe*m Qay 26 Trpa Qao1 Qao1 af Tcc Qagf Qao2 Qao2 Trrc Trrc 21 Qayh Qagf af af Tcc Qayh Trrc Trpa Tkn 10 Qao1 Qao2 71 Qao2 Qao1 g 3697000 Trrc Qagf Qay g Trp Qayh g Qah Tvt Qao1 g Tcc Trpba Trp af Qah Tsfu Tkn 19 Qao2 Qao2 Trrc Tcc Qao1 Qao3 21 28 Tkn g 36 Qah Qao3 Trrc g Tkn 28 o o 25 af Qao3 Qao3 Qayh g 72 g 80 3698 000 g Qao2 g Tvt Tsfu Qsa Qao2 Tia Qao2 Qao3 g Qao2 Qao1 af Qao2 Qao2 ȱ ȮRed, maroon, and yellowish-to reddish-brown siltstones, mudstones, and sandstones, with thin interbeds of fossiliferous gray silty limestone in the lower 30 m ("transition beds" of Jahns et al., 1978). Measured thicknesses of 315 m by Jahns et al. (1978). Pa Tsfu Qao2 Qao2 Tkn Trpba Qao3 af ȱ ȱ ȱ ¢ȱ ȮGray-to dark-gray, aphanitic-to sparsely-porphyritic basaltic andesites. As much as 10% phenocrysts of plagioclase, pyroxene, and rare biotite, generally under 1 mm across. Belongs to the widespread SCORBA suite of Cameron et al. (1989). Includes rare interbedded volcaniclastic rocks. ȱȱȱȱȮInterbedded-variegated yellowish, greenish, and reddish sandstone and siltstone, and medium-to dark-gray fossiliferous limestone. Measured thicknesses of 233 m for the Yeso, and at least 213 m for the San Andreas (Jahns et al., 1978). Pys Trp me Qao3 ¢ȱ ȱ ȱ ȯDark-red-brown porphyritic alkali rhyolite lavas. 10% ¢ȱȱȱȱȱȱŗǯśȱȱǯȱȱȱȱĵǯȱȱǰȱ discontinuous pyroclastic rocks. ǻǵǼȱ ȮȬȱ ĵȱ ǯȱ Ȭȱ Ȭǰȱ ȱ ȱ Ȭęǯȱ ȱ ȱ ȱ Ŗ–8 m; commonly missing due to early Tertiary erosion. Kd unconformity, angular to south Qao2 Qao2 Qay Qao2 Qayh ȱ ȱ ěȯLight-gray to light-brown, massive, moderately-to densely-welded, ¢Ȭȱ ȬĚ ȱ ěǯȱ ¢ȱ ȱ ȱ ǻŗ–řƖǼȱ ȱ ȱ ĵǯȱ ȱ conspicuous, large, elongate pumices, most of which bear a granular texture from vapor-phase mineralization and recrystallization. Erupted from the Nogal Canyon caldera, NE of quadrangle; single-crystal sanidine ŸŴAr/ŷŽȱ ȱ ȱ ŘŞǯşřƹŖǯŗŘȱ ȱ ǻȱ ȱ ǯǰȱ 1991). Basalt of Tabletop Mountain*, 4.5-5.0 Ma (3,4) Tbtm Qao3 Qayh Qao2 Trpba 3698000 Qay Tkn g 3699 000 Qao2 Qao2 Qao2 af Trp Qay Qayh Qah af Qao1 Tkn 85 70 Qao2 Qah Qagf Qay Qao3 Qao2 Qao1 35.3 Ma (1) Qah Qao2 Qao2 Tpc Trpba Qao2 Qao2 Qayh Qao3 Ȭ unconformity Qao3 Qsa Qao2 af Qao3 af Qao2 Trph ? Qao2 g Tkn Qao2 Qao2 Qao2 af af Tpc Qao2 Qayh g g g g Trp Tvt Qay Qayh Trp Qao2 Qao2 Qao3 Trph Qao3 Qao2 Qay Qah Trp 3699000 Qao2 Qao2 Qao2 e Qayh Qayh Qao2 Tkn 3700 000 79 Qao2 Qao3 Trp Qao2 Qay Tsfu Qayh Qah Trpa Qao Qao2 Qao2 Qao2 Qayh 81 Tcc Qao2 33°25'0"N Qao2 g 18 g 75 o Tpc Trrp 50 Qayh Qao2 20 Tkn Qao2 Qah g Trp Qao3 Qao3 g 19 Omm Qao2 g o 78 Trp Qao2 o g o Tpc Tsfu g o 10 e Qao2 Qsa Qayh Trrc Tia Trrc Trpa Qca 58 Tkn Trrc g g Tpc Tcc Qao2 Qao3 Qayh af Qao2 35 Qao3 Tirp Qayh Tkn Trrp g o Trpa Qao2 3701 000 af Qayh Qao2 Tkn 33°25'0"N Qah Qayh 5 Qao2 Qao2 8 Qao3 Trrc Tpc 78 ¡ȱȱȱȱȮExotic blocks of Pennsylvanian limestone surrounded by ȬĚ ȱȱȱ ȱȱȱǯ *me Correlation of Map Units g Trrc g 15 3701000 6 o g o16 23 g o Tvt 21 Tsfu Qao2 ȱ ȱ ǰȱ ȱ Ě Ȭȱ ȮVolcaniclastic conglomerates. ¢ȱ ǰȱ ǰȱ ¡Ȭȱ ȬĚ ȱ ǰȱ ȱ ȱ ȱ boulders of aphanitic and porphyritic intermediate volcanic rocks. Interbeds with sandstones to the south. Surrounds landslide blocks of limestone (me). Trp Qao2 af af 29 Tvt Tcc 3700000 Qay Tia 31 Trp Qay Trpa Trph Qayh g Trrc g 56 Tkn Trrc Qay Qao3 Tkn o 65 Qah o Trrc Tkn 56 24 Tcc o Trrc Qao2 Tvt 3702 000 Qao2 g 27 Omm Qao2 o Qayh 79 62 Tsfu g o Tkn Qao3 Qao2 Pa Qayh 6 Qao Qca Qao Tkn Qao 9 Qao2 Qao2 Qayh Qayh g Tcc Trrc 47 Tkn Trrc 28 Qay Qah 64 Qao2 o Trp o 20 o o g 21 1 Qayh 3 Qayh g 14 Qao Trpa Omm Qao2 Qah Qayh o Qao o o Tia Trrc o Trrc 60 Omm Trrp Qao2 o 4 Tcc Qah Qao2 o Tkn Qca Trp Tcc Qao3 Qayh 4 3703 000 g Qao1 Qca Qao2 o o11 Trrc 3 Qay 29 Qao2 Qao2 Qah Qao2 Tcc 3702000 Qay Qca Qao2 Pa o o o g Qao2 Qao2 Qao2 Qao2 2 o g Qayh Tsfu Qao2 Qah o Qao2 Qay 28 o Qao2 Tirp Trrp o Qao2 Trpa o14 e g af Trpa Qao2 Qao2 Qao2 o Tia af Tsfu ȱ ȱ ȱ ȯȱ ¢ȱ ȱ ȱ ȱ ȱ ¢ȱ ȱ ęȱ ȱ Winston graben. Derived from both the Black Range to the west and Sierra Cuchillo to the east. Western gravels are volcaniclastic, matrix-poor, generally poorly cemented, but with local carbonate accumulations up to Stage III as buried soils. Gravels are mainly andesite porphyries, with lesser rhyolites, aphyric lavas, and sparse limestone. Eastern gravels typically contain more matrix material with lighter colors, as well as more abundant limestone, felsic phaneritic and porphyritic rocks, and red siltstones. At the surface, the eastern and western facies meet at the Deep Well fault, a continuous scarp that may be an erosional feature. Local southward pebble imbrications along this trend suggest a southward axial drainage. Tsfu 5 Qao2 Tsfu Qao2 af Qao2 51 Trrc Santa Fe Group Tirp o Tia Qayh 41 Qayh o Qao2 af o Qao2 Tia Tcc Qao2 Qay g Trp 5 Tcc TERTIARY Omm af o Qah Tkn 3703000 Qayh Qao2 Qayh Qao2 3 8 o Tsfu Tsfu Qayh Qay Qah o 35 Qah Tirp Tir o g o o 28 Trpba 58 14 o Qca 70 Tkn Trrc 74 g Qao1 Qao2 67 Trrp Tirp Qao2 Qao2 Trrc g Trrc Trrc 3704 000 o Trrc 63 Qao2 Tkn Qay Qayh g 3704000 Tkn Tkn 84 g Trrc Qayh g Trp Tkn ȱ ǰȱ ȯȱ ȱ ęȱ ȱ ȱȱȱȱȱǯȱ 0–3 m thick. Qao Qah ȱ ȱ ȱ ȯȬȱ ¢. Rhyolite pebble to cobble conglomerates, ěȱ ǰȱ ȱ ěǯȱ ȱ ȱ ŘŝǯŝřƹŖǯŗŚȱ ȱ ȱ ¢ȱ ěǰȱ ȱ erupted from the Mt Withington caldera to the NNE of the quadrangle (Harrison, 1990, 1994; age from McIntosh et al., 1991). Where exposed to the south, unit is variably incised into the ȱȱěȱǻ ȱȱǰȱŘŖŗŘǼǰȱȱȱȱ ȱȱȱȱȱȱ cross-section. Trpba ȱ ȱǰȱȱȯPoorly exposed gravels underlying terrace treads inset upon by those of Ř. Pebbles and cobbles underlying treads 25–40 m above local channels, decreasing upstream. 0–8? m thick. Qao1 Tia 18 Qao2 Qao2 o Tir Qao2 o Trrc Qay Tsfu o o o 33°27'30"N 27 2 Qao2 Tpc Trrc af 3705 000 35 37 Tir 22 bOe Qayh Qao2 Qay Tcc Omm o 1 Qao1 Tkn Tcc 6 Qayh Tsfu Trpa Qca Trrc Qayh g Trp Trrc Tirp Qca Tkn g Tpc 31 Qao2 Qsa 32 Tirp Qao2 Qao2 g 3705000 2 Qay ȱǰȱȱȮSandy pebbles and cobbles with well developed soils underlying terrace treads 6–25 m above local channels. Tread height increases downstream from mountain fronts. Dominantly medium pebbles, with a few percent cobbles. Carbonate £ȱ ȱ ȱ ȱ ȱ ǰȱ ȱ ȱ ȱ ¢ȱ ęȱ ȱ ȱ ȱ ȱ carbonate horizon. Rare buried soils with carbonate horizon development up to Stage II. Colors as red as 5YR 5/4, typically 7.5YR 7/2 to 7/3. 3 to 8 m thick. Qao2 o Qao2 af g Qsa Pys Pa u af Qao2 o g af Qca 35 Tsfu Qao1 Tsfu o37 84 af Qao1 63 Qay 10 o g Qah Qao1 33°27'30"N Tgim Qao2 Tpc 66 o Tsfu Qao2 me 22 Tia Trp Qao1 Tpc ȱǰȱ¢ȱȮVery-poorly-exposed gravels underlying terrace treads inset upon treads of Ř. Surfaces dominated by pebbles with rare carbonate coats. Tread heights are 3–ŗŖȱȱȱȱȱĚǰȱȱǯȱŖ–2 m thick. Qao3 41 bOe Trp 3706 000 o g g o36 28 44 82 Trp o Qao2 25 Tirp Tsfu 52 Qayh Tirp o o Omm Tsp ȱ ȱ ȱ ǰȱ ȮCombination of units and ¢. See individual descriptions for more detail. Miocene g Tirp 9 af Tirp 34 Oligocene g g g u 11 Tirp g 3706000 g Tirp af g 86 Trp Tirp Eocene g 30 Pys o 29 Tirp o Tgim 30 o 53 me me Trp Pys g ȱ ȮInterbedded pebbly silty sands and pebbly channels, with weak soil development. Weak buried soils are common, and distinguished by darkened A horizons. Carbonate horizon development up to Stage I+ in active and buried soils. Colors of 10YR 4/2 to 6/3 common, local 7.5YR hues. Underlies terrace treads up to 3 m above local channels. 0–4? m thick. Qay 3707 000 39 Pys 48 Omm af g me 77 71 me o Trp Qao Tvp Pys g ȱ ȱ ȱ ȯModerately-dipping pebble to cobble conglomerates locally exposed in the Havill embayment. Dominantly consists of poorly-sorted andesitic lava clasts with lesser limestone gravels. Variably cemented, with a light-brown to light-pink color. ȱ ȱȱǰȱȱȱȮDark, aphanitic, intermediate lavas. Multiple Ě ȱ¢ȱȱȱĚ ȱȱȱ ȱȱȱǯ Mogollon Group ¢Ȭȱ ȮGravel, sand, and silt associated with active gully-mouth fans. No soil development. 0–1 m thick. Qagf Trp Trpa 21 60 Qao Tirp Tsfl Pg 32 g g 34 64 Tirp Qao g o Tpc me 3707000 Tsfu Qca 24 49 Qah ȱȱǻŖȬśŖŖȱ¢ȱǼȮǰȱǰȱȱȱȱ ȱȱĚ ȱȱ ȱ ǯȱ ȱ ȱ ȱ ȱ ȱ ŗȱ ȱ ȱ ȱ ȱ Ěǰȱ ȱ ȱ ȱ development. 0-2 m thick. 3708 000 Pys Tsfm 64 52 af g Tvp 49 Tirp o af Tsp 83 Tirp Tirp 48 52 Qao g g Trpba Qayh af Qsa ȱ ȮSilt and lesser sand forming low-gradient aprons that conceal ¢ȱ ȱ ǯȱ ȱ ȱ ęȬȱ ǰȱ ǰȱ ȱ ȱ gully-transported material. 0–1 m thick. 32 46 Trp Tgim g o o o g 35 48 Qao g 3708000 Tsfm Omm g me Qca 45 af o g QUATERNARY Plio. Pleistocene Holo. TERTIARY CRET. g Tsfm ȱ ȱ ǰȱ ȮGravel, sand, and silt burying geologic features. Includes gravity-, slopewash-, and minor channel-transported material. 0–2 m thick. Qca g o Qao2 31 Qca 64 Trp 40 g Tpc Tpc me 19 o Trpba Qao2 Tsfm 44 ęȱęȮCompacted sand, silt, and gravel, mainly of earthen dams. 0–2 m thick. af ORD. SIL. DEV. MISS. PENN. PER. Qao2 Trpba U Qao2 22 o g 3709 000 g Qao2 73 me Tirp Qayh Oe*m g g 20 QUATERNARY Qao o o o af 70 D Qayh 62 77 g Qsa g Tsp 3709000 Tsfu gg v Tsfu Trp Qayh Qao Qayh o 70 Qca Qah Qayh g o me Map Unit Descriptions Qao g 80 Trpba Trpba Tsfu me g 52 56 Trp 3696 000 * Tbtm, Twa, andȱĚ are exposed on the Winston and Chise quadrangles to the south; they are included here for their geochronologic importance Tsfu Qay 254000 255000 33°22'30"N Map Symbols 1:24,000 Base map from U.S. Geological Survey 1970, from photographs taken 1965, field checked in 1970, edited in 1993. 1927 North American datum, UTM projection -- zone 13N 1000-meter Universal Transverse Mercator grid, zone 13, shown in blue 1 WAHOO PEAK WAHOO RANCH MONTOYA BUTTE 0.5 1000 0 1 SAWMILL PEAK IRON MOUNTAIN IRON MOUNTAIN JARALOSA MOUNTAIN NEW MEXICO 0 1000 0.5 2000 3000 1 MILE 4000 5000 0 6000 WINSTON CHISE Contact—Well-located, approximately located, concealed. ȱ ȱ¡ȱȱǯȱȱĴȱ shown with tick with dip value. 60 7000 FEET July 2012 1 KILOMETER Magnetic Declination July 2011 9º 26' East At Map Center by Colin T. Cikoski 1, Richard W. Harrison 2, Daniel J. Koning 1, and Richard H. Jahns 3 1 QUADRANGLE LOCATION 45 Dikes—ȬǰȱȱȱǯȱȱĴȱ shown with tick, showing dip value. 35 Fault—Well-located, approximately located, concealed. Queried where existence uncertain. Bar on down-thrown ȱ ȱ ȱ ǰȱ ȱ ȱ ȱ ěȱ ȱȱ strike-slip faults. Fault plane measurements shown with ticks, giving dip value; fault striae and mullion trends shown with arrow, giving plunge value. CONTOUR INTERVAL 40 FEET NATIONAL GEODETIC VERTICAL DATUM OF 1929 LOOKOUT MOUNTAIN Geologic map of the Iron Mountain quadrangle, Sierra County, New Mexico. 80 35 Inclined bedding, showing dip value. Horizontal bedding. 20 75 Inclined foliation, showing dip value. ȱȱĴǰȱ ȱȱǯ Paleocurrent direction from pebble imbrications Fault scarp—Well-located, approximately located. Hachures point down-scarp. Queried where fault existence is uncertain. New Mexico Bureau of Geology and Mineral Resources, Socorro, NM 87801 2 U.S. Geological Survey, Reston, VA 20192 3 Deceased Areas bearing tactite mineralization COMMENTS TO MAP USERS [575] 835-5490 http://geoinfo.nmt.edu Mapping of this quadrangle was funded by a matching-funds grant from the STATEMAP program of the National Cooperative Geologic Mapping Act, administered by the U. S. Geological Survey, and by the New Mexico Bureau of Geology and Mineral Resources, (L. Greer Price, Director and State Geologist, Dr. J. Michael Timmons, Geologic Mapping Program Manager). Cross sections are constructed based upon the interpretations of the author made from geologic mapping, and available geophysical, and subsurface (drillhole) data. Cross-sections should be used as an aid to understanding the general geologic framework of the map area, and not be the sole source of information for use in locating or designing wells, buildings, roads, or other man-made structures. The map has not been reviewed according to New Mexico Bureau of Geology and Mineral Resources standards. The contents of the report and map should not be considered final and complete until reviewed and published by the New Mexico Bureau of Geology and Mineral Resources. The views and conclusions contained in this document are those of the authors and should not be interpreted as necessarily representing the official policies, either expressed or implied, of the State of New Mexico, or the U.S. Government. W Black Range A N47W A' N50E S50W 2,400 Turkey Creek 2,200 Tkn Trrc 2,000 Trp 1,800 1,600 Trp/Trpa? Tkn Trrc Tcc? Trp/Trpa? Tkn Trrc Tcc Tkn Tpc Trrc Tkn Trrc Tcc? Trp/Trpa? Tkn Tcc Trp/ Trpa? Tpc Trrc Tkn Trrc + Tcc Tpc Tkn Trrc Tkn Tkn Trrc Trrc Tkn Poverty Creek apparent dip of bedding Trrc Qao2 Tsfu Trp/Trpa? Qay Qay Qay Qay Qay generalized paleocurrent direction Trpa Tsfm Tsfl+Tvp Tsfm 1,400 Cross-section notes: - Thickness of Quaternary alluvium is exaggerated. - Thickness of interbedded Ts and Tcc is likely much more variable than shown. Thickness of ~90 m is based on exposures at the southern end of this quadrangle. ȬȱȱȱȱǰȱƸǰȱȱĚƸȱȱȱȱȱǯȱȱȱȬȱȬȇȱȱȱȱȱ¢ȱȱśŖȬŗşŖȱȱȱǰȱȱȱDžŜŝśȱȱȱDžŝśȱȱȱƸȱȱ ĚƸǰȱ¢ȱǻ ȱȱǰȱŘŖŗŘǼǯ Ȭȱǯȱȱǻǯȱǯǰȱȱȱ ǰȱŗşşŖǼȱȱȱȱȱŜŜŖȱȱȱȱȱ¡ȱȱȱ ȱȱȱǯȱȱ ȱȱȱĴȱ ȱȱȱȱǰȱȱȱȱȱȱ underlying intercepted unit is not known. It is possible the intercepted unit is the andesite of the Winston graben (or time-equivalent lava), which lay between the upper and middle Santa Fe Group units along the east side of the ȱȱǻ ȱȱǰȱŘŖŗŘǼǯȱȱȱ ȱȱȱȱȱȱȱȱȱȱ ȱ¢ǰȱȱȱȱȱȱȱȱ¢ȱęȱȱ¢ȱȱȱ ȱǯ ȬȱȦȱȱȱȱȱȱȱDžŗŞŜśȱǯǯǯǯȱȱȱȱȱȱȱȱȱǻ ȱȱǰȱŘŖŗŘǼǯȱȱȱȱ ȱȱȱȱȱ ȱȱȱȱȱȱȱǻȱ report). Contact location here is therefore very approximate. Ȭȱȱȱȱȱȱȱȱȱȱȱȱȱȱǻ ȱȱǰȱŘŖŗŘDzȱȱȱ ǰȱȱǼǯ Ȭȱ¢ȱȱȱȱȱȱ ȱȬȱěȱȱ Dzȱ¢ȱȱȱ¢ȱ¡ǰȱ¢ȱ ȱȱȱǰȱ ȱȱȱȱȱȱǯ Exploration drilling T10S R8W Secs 3 and 10 (approximately located) NM-52 Tsfu Tsfu Trp/Trpa? Trp/Trpa? Pa Winston graben Tpc Tsfm Tsfu Tsfm Tsfl+Tvp Tpc A'' N85E Oe*m Pinon Spring _b Iron Mountain Havill Canyon Oe*m _b Oe*m Pys =u Pa Oe*m Tsfl+Tvp Tpc 2,200 2000 Tirp =u 2,400 Pa _b Tirp Tgim A''' E Trp Pys Tsfu =u Sierra Cuchillo Oe*m Oe*m _b 1,800 1,600 1,400 Meters above sea level This and other STATEMAP quadrangles are available for free download in both PDF and ArcGIS formats at: A geologic map displays information on the distribution, nature, orientation, and age relationships of rock and deposits and the occurrence of structural features. Geologic and fault contacts are irregular surfaces that form boundaries between different types or ages of units. Data depicted on this geologic quadrangle map may be based on any of the following: reconnaissance field geologic mapping, compilation of published and unpublished work, and photogeologic interpretation. Locations of contacts are not surveyed, but are plotted by interpretation of the position of a given contact onto a topographic base map; therefore, the accuracy of contact locations depends on the scale of mapping and the interpretation of the geologist(s). Any enlargement of this map could cause misunderstanding in the detail of mapping and may result in erroneous interpretations. Site-specific conditions should be verified by detailed surface mapping or subsurface exploration. Topographic and cultural changes associated with recent development may not be shown. up to 660 m of sediments New Mexico Bureau of Geology and Mineral Resources Open-File Geologic Map 229 Meters above sea level New Mexico Bureau of Geology and Mineral Resources New Mexico Tech 801 Leroy Place Socorro, New Mexico 87801-4796
