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Geologic Map of the Stricker 3 Quadrangle, Twin Falls and Cassia Counties, Idaho by Paul L

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Geologic Map of the Stricker 3 Quadrangle, Twin Falls and Cassia Counties, Idaho by Paul L Geologic Map of the Stricker 3 Quadrangle, Twin Falls and Cassia Counties, Idaho By Paul L. Williams, James W. Mytton, and William A. Morgan Geologic Investigations Series I–2633 Tuff of Wooden Shoe Butte, lower member. Thin dark line marks the contact with underlying unnamed bedded tuff unit 2. Location is in Rock Creek canyon at Steer Basin campground. (Photograph by P.L. Williams, 1980) 1999 U.S. Department of the Interior U.S. Geological Survey U.S. DEPARTMENT OF THE INTERIOR GEOLOGIC INVESTIGATIONS SERIES U.S. GEOLOGICAL SURVEY I–2633 114 30' 27'30" 25' R. 17 E. R. 18 E. 22'30" 20' 17'30" R. 18 E. R. 19 E. 114 15' 42 15' 42 15' Ts Tt CORRELATION OF MAP UNITS to reddish blocks that ring when struck with a hammer and form conspicuous talus Twl Tt2 2 Tt Ts Tt2 15 Tw Tmc Ts 2 Tt2 Pw Tt2 Pw aprons below outcrops. Medial devitrified zone is cliff-forming, reddish-brown tuff Tt2 Tw Tbb Tm Tt1 Tt2 Surficial deposits containing 5-20 percent conspicuous white plagioclase phenocrysts. Basal vitrophyre T. 13 S. Twu Tmc Tw Tt Tw 2 Tmc T. 13 S. T. 14 S. Qaf Tt2 contains obsidian that was used by prehistoric Indians to make projectile points and Twl Twu Twu Ti T. 14 S. Qa Holocene + Tt Tw Tw Tbb Qaf Ql scrapers. K-Ar age is 12.0 +0.4 Ma according to G.B. Dalrymple (written commun., Ts 2 Tmc Tt2 Tw Ts Tw 1979), and about 10 Ma [40Ar/39Ar] according to Perkins and others (in press). Ts 30 Tt2 Tw Ts Tmc Qst Qsf Thickness 30-60 m (100-200 ft) Tbb Ts Tt Ts QUATERNARY 12 2 Pleistocene Tt Tmc Tt2 Tw 1 Unnamed bedded tuff unit 1—White to gray, locally light-green, thin- to thick-bedded air- Tbb Qgt 10 10 Qbd fall tuff and silty to sandy thin-bedded water-laid tuff. Mapped separately in the Ts northeast quarter of the quadrangle and locally elsewhere; in other places included in Twl Ts Ts Twu Tmc 5 Tm the tuff of Big Bluff. Thickness 0-60 m (0-200 ft) Tw Tt2 Twu Tt Tw Tw 2 Ts Tw Ts Pliocene? Tbb Tuff of Big Bluff—Compound cooling unit of moderately to densely welded tuff. At the top Tmc 26 5 Tbq is usually a ledge about 1 m thick of lithophysal tuff locally capped by a thin gray Tbb Ts Ts Tt2 13 vitrophyre. In the middle is a blocky, slope-forming vapor-phase zone of pale-purplish- Tmc 10 Tt Tt2 Ts Ts Tt2 1 Silicic volcanic rocks Ts Tw gray tuff on a devitrified zone consisting of pink to red tuff containing small, flat, gray Twu 5 Tw Tbb 46 Tw Tmc 20 Tw Tmc lenticles of vapor-phase minerals 1-4 cm long. This zone crops out as dark, craggy Tt 22 Tt1 Pw 45 22 2 Tmc columnar cliffs containing large, weathered-out subspherical cavities. Black basal Qa 20 Tt2 Tw 12 Tw Twu Tmc Qa Ts vitrophyre is as much as 15 m (50 ft) thick. Phenocrysts form 5-25 percent of the Tbb 15 Tw 18 Tw Twl 17 20 Ts 7 Twl Tm rock and are mostly alkali feldspar and quartz and minor plagioclase. K-Ar age is 16.2 16 Tbb 24 Tw 5 25 TERTIARY + 0.5 Ma (G.B. Dalrymple, written commun., 1979); Perkins and others (1995) Tmc 17 Tt2 Tt2 8 Tt 5 Tbb 11 Tbb 2 Tm 23 suggest a much younger age of 10.83 + 0.03 Ma (40Ar/39Ar). Thickness 45-120 m 20 Tt 12 17 Ts 2 4 Ts Tbb Tw (150-400 ft) Tmc Ts Tw Tt2 Tt1 Miocene Tw Tmc Tw 24 42 52 Tm Tuff of Magpie Basin—Moderately to densely welded tuff. Mostly chocolate-brown, cliff- Tm Tt 13 Pw? 1 forming devitrified tuff above a basal crumbly gray vitrophyre. Top of unit is gray 22 18 4 Tt Qa Ts Tt 20 2 2 Tbb Pw Tbb vapor-phase tuff, overlain by a layer of gray hydrated glass. Phenocrysts, mostly 12'30" 15 60 12'30" 20 plagioclase, form 5-15 percent of the unit. Present only in the northeast part of the Ts 15 Tmc Tt Tm quadrangle. Thickness about 25 m (80 ft) Tw 2 10 Ts Tt White to gray, rarely orange, thin-bedded to massive air-fall tuff and Tt2 Tmc Ts 1 Ti Tuff of Ibex Peak— 10 Tm Tt2 Tt1 Tw Pt Ti Twu Tt tuffaceous sandstone and siltstone; locally cross-bedded. Contains minor thin beds of Twl 7 Ts 2 13 22 30 Ts 30 Tbb Tm conglomerate. Present only along east margin of quadrangle. Thickness 0-50 m (0- Ts Tt2 19 160 ft) Tmc Tt Ts Sedimentary rocks 4 Tw 2 Tmc Tmc Tmc Tm Tbb 8 PALEOZOIC SEDIMENTARY ROCKS Tmc 13 Tt2 Ppr Ts (see Mytton and others, 1983) Tt2 Tmc Tt2 Ppmp 8 Tw Tt1 6 Tw Tmc 20 5 3 32 Phosphoria Formation (Lower Permian) 7 Tbb Ppg 12 Tt Tw 2 Ts Twl Pt Twl 7 Tw Tt Tw Ptc Lower Permian PERMIAN Ppr Rex Chert Member—Medium-dark-gray chert forming bands 10-15 cm thick; weathers Twu Ts Ts Tw 2 Tw 33 Tt2 Qa olive to brown; locally shows lamination and cross-stratification and contains 34 Ts 20 Pb Pb Tt chalcedony-filled fractures. Some beds are spicular, and others have sparse fossil Twu 2 Tmc 6 Ts Qa Ts Tmc debris. Medium- to thick-bedded in upper part, thick-bedded to massive in middle part, Tw Tw Tmc Pt Tmc 22 Tt2 and thin- to medium-bedded in lower part. Forms prominent cliffs. Thickness about 12 Tt Tbb 1 Pw 180 m (600 ft) Tw Tt2 Tbb Tmc Ppmp Meade Peak Phosphatic Shale Member—Dark-brown thin-bedded siltstone containing Tt Tt2 Ts Tw 2 Tmc Tt Tw 2 53 minute white-weathering phosphatic oolites or pellets; dark-gray, partly silicified 16 Ts phosphorite containing abundant fossil debris; interbeds of shale, chert, silty limestone, 12 Tmc Tt2 Qst Tt2 Tt and fine-grained sandstone present locally. Upper part of unit characterized by brown Ts 2 Ts 22 and yellowish orthoquartzite; brown chert; white to yellow, red and purple mottled, Qsf Ts DESCRIPTION OF MAP UNITS Tw 27 platy silicified sandstone and siltstone; and, locally, olive- to brownish-gray partly Twu 22 Tbb Qsf Ptc? SURFICIAL DEPOSITS silicified limestone (wackestone) to dolomitic limestone. Liesegang rings common on 10' Twl 5 Qst Tw 10' surfaces of slabs of orthoquartzite, sandstone and siltstone. Forms steep to gentle Tw Qa Alluvium (Holocene)—Gravel, sand, and silt mostly along flood plain and channel of Tw Tw Shoshone Creek and its major tributaries. About 1-5 m (3-15 ft) thick slopes. Thickness about 90 m (300 ft.) 8 Qa Qa Ts Tbb 12 Tt1 Tw Twu Tw Ts Qaf Alluvial fan deposits (Holocene and Pleistocene)—Poorly sorted gravel, sand, and silt on Ppg Grandeur Tongue of Park City Formation (Lower Permian)—White, fine- to medium- Tw slopes flanking the Cassia Mountains in the northwestern part of the quadrangle and grained, finely laminated, thin- to medium-bedded silicified and dolomitic sandstone; Ts 18 Ts Tt2 Tt small deposits in scattered localities elsewhere. Thickness 5-20 m (15-65 ft) or more grades vertically and laterally into orthoquartzite. Locally contains interbeds of siltstone T. 14 S. Tmc Tt2 15 Ts Tt1 2 T. 14 S. T. 15 S. Tw Tt 29 Tbb Ql Landslide deposit (Holocene and Pleistocene)—Large blocks, boulders, sand, and silt and chert and grades vertically and laterally into sandy and silty laminated dolomite. Tw 7 Qsf 2 T. 15 S. Ptc? Tw forming poorly sorted deposit mantling bedrock in the southeastern part of the Sandstone displays small- to medium-scale cross-stratification; some laminae are 15 Tmc Tbb Ts Tmc Ptc quadrangle. Thickness as much as 40 m (130 ft) completely silicified and have a banded appearance. Uppermost part mainly dark 8 Tw Alluvium of Shoshone Basin (Middle(?) Pleistocene)—Alluvial fill in Shoshone Basin chert. In lower part, white to light-gray very fine grained dolomite (dolomitic packstone Tt2 20 Tw Tt Tw Ts Tt1 resulting from damming by basalt flows (Qbd) that partially filled the canyon of and wackestone) containing abundant fossil debris (principally brachiopod fragments 14 2 Ts Tt Tt2 8 1 Ts Tt2 Shoshone Creek in the southwestern part of the quadrangle and crinoid ossicles) alternates with sandstone. Chert and less silty dolomite increase Tw Qsf Tw Qst Terrace gravels of Shoshone Creek and major tributaries—Subrounded to rounded upward in section. Unit forms steep to gentle slopes. Thickness about 150-180 m Tt1 Qa Tw cobbles and pebbles in a matrix of sand and silt forming a low terrace 6-30 m (20-100 (500-600 ft) Tmc Ts 15 Ts Qsf Ts ft) above the flood plain in northern and western Shoshone Basin. Coarser clasts are Ptc 5 Qa Ts Tt2 Trapper Creek Formation (Lower Permian)—Medium- to dark-brownish-gray, very fine 12 Tw Tt2 Tt Tw slightly to moderately weathered. Deposit is locally quarried for road metal and fill. grained, medium- to thick-bedded, fossiliferous limestone (packstone to wackestone) Tmc Ts Tw 1 Qa Tw Thickness 5-25 m (15-80 ft) alternates with brown to yellowish, very fine grained, thin- to medium-bedded, Qa Ts 5 Tmc Tmc Qsf Alluvial-fan deposits—Subangular to subrounded cobbles and pebbles, mixed with sand calcareous, silty sandstone and siltstone that grade laterally into orthoquartzite.
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