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GEOLOGIC MAP of the SAN GORGONIO MOUNTAIN QUADRANGLE SAN BERNARDINO and RIVERSIDE COUNTIES, CALIFORNIA by T

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GEOLOGIC MAP of the SAN GORGONIO MOUNTAIN QUADRANGLE SAN BERNARDINO and RIVERSIDE COUNTIES, CALIFORNIA by T DEPARTMENT OF THE INTERIOR UNITED STATES GEOLOGICAL SURVEY PREPARED IN COOPERATION WITH THE CALIFORNIA DIVISION OF MINES AND GEOLOGY GEOLOGIC MAP OF THE SAN GORGONIO MOUNTAIN QUADRANGLE SAN BERNARDINO AND RIVERSIDE COUNTIES, CALIFORNIA By T. W.Dibblee,Jr. MISCELLANEOUS GEOLOGIC INVESTIGATIONS MAP I-431 ,.......; t() ~ I PUBLISHED BY THE U. S. GEOLOGICAL SURVEY - WASHINGTON. D.C. 1964 DEPARTMENT OF THE INTERIOR TO ACCOMPANY MAP 1-431 UNrrED STATES OEOLOOICAL SURVEY GEOLOGIC MAP OF THE SAN GORGONIO MOUNTAIN QUADRANGLE, SAN BERNARDINO AND RIVERSIDE COUNTIES, CALIFORNIA By T. W. Dibblee, Jr. DESCRIPTION OF· MAP UNITS content, presumably including chlorite, biotite, and iron oxides. Unit includes lenses as thick as 50 feet PRECAMBRIAN(?) METAMORPHIC ROCKS of dark grayish-brown fine-grained mylonitic rock composed mainly of chlorite, biotite, and iron oxides, Schistose rocks with scattered white augen of plagioclase. Unit as thick as 4,000 feet,· forms present lower part of Dark highly foliated schists metamorphosed gneissic rocks; grades upward into gneiss. possibly as early as Precambrian or as late as Mesozoic times from Precambrian(?) sedimentary Gneiss.--Light- to dark-gray, ranges from lam­ or volcanic rocks. The following lithologic units were inated gneiss to gneissoid quartz diorite or grano­ mapped: diorite, composed of plagioclase (andesine), quartz, biotite, potassic feldspar, and hornblende, in variable Schist.--Dark greenish-gray, greenish-brown­ proportions but generally in that order of decreasing weathering, medium- to fine-grained schist composed abundance, and small amounts· of muscovite, sphene, mostly of flaky chlorite and smaller amounts of finely apatite, and clinozoisite. Rock banded with light-gray divided actinolite and epidote, and abundant white augen to white laminae rich in feldspar and quartz alternating or porphyroblasts as large as 2 mm of albite or albite­ with dark-gray to black laminae rich in biotite and · quartz aggregates (Allen, 1957, p. 320-321). Foliation hornblende and g:J;"ay laminae of intermediate com­ presumably parallel to original bedding. Exposed position; laminae fine- to coarse-grained; mica-rich thickness about 2,000 feet; grades upward (southward) laminae foliated, schistose; laminae generally undu­ into mylonitic schist. Schist similar to chlorite­ .lating, commonly contorted, in places have lineation; albite-actinolite-epidote (green schist) facies of some biotite-rich gneiss contains large lenticular Pelona Schist (Precambrian?) of Sierra Pelona (Dib­ knots (augen) of pink potassic feldspar and quartz. blee, 1961) and eastern San Gabriel Mountains. .Gneissoid quartz diorite or granodiorite, gray, nearly Mylonitic schist.--Dark, greenish- to brownish­ homogeneous, but with generally parallel orientation gray, foliated rock composed ofscatteredtonumerous of biotite and hornblende. Thin sills and dikes of white lenticular white augen as long as 2 mm of mostly pegmatite commonly present. albite or albite-quartz aggregate in dark, indistinctly Quartzite.--Tan to light-gray, poorly bedded, banded, milled aggregate of indistinguishable mineral fine-grained, vitreous, brittle, severely fractured; content. Mylonitic texture presumably formed by interstratified in about 600 feet of gneiss on Yucaipa shearing along foliation planes during or after meta­ Ridge. · morphism. ·Forms upper approximately 1,000 feet of schistose rocks; grades upward into gneissic rocks. Mar b 1 e.--White, poorly bedded, medium- to coarsely crystalline marble composed mostly of Gneissic rocks calcite, minor amount of dolomite; occasional.ly forms lenses as thick as 25 feet in gneiss. Includes San Go r go n i o Igneous-Metamorphic Complex of Allen (1957). Gray, fine- to coarse­ PALEOZOIC METAMORPHIC ROCKS grained gneissic rocks; formed probably a~ great depth by extreme recrystallization of Precambrian(?) Saragossa Quartzite sedimentary or metamorphic rocks, or possible in part by lit-par-lit injection by grank1c magmas, Named by Vaughan (1922, p. 344, 352-3.63) for possibly as early as Precambrian or as late as Saragossa Spring near type locality on Gold Mountain, Mesozoic times. The following units were mapped: Lucerne Valley quadrangle. Unfossiliferous. Age, presumably Paleozoic. Mylonitic gneiss.--Light- ·to dark-gray, hard, fine- to coarse-grained banded mylonitic or cataclas­ Quartzite.--Light-gray to white, massive to lam­ tic gneiss composed of rounded white grains as large inated, locally cross-bedded, hard, brittle, fine­ as 5 min in diameter in datk banded matrix. White grained to vitreous quartzite composed almost entirely grains mostly plagioclas·e (andesine, oligoclase, or of quartz and locally minor amounts of feldspar and albite) or plagioclase-quartz aggregate, some of biotite; fractures coated with brown to pink iron stains. potassic feldspar (AHen, 1957, p. 320); presumably Maximum thickness possibly 3,000 feet, unconformable rounded by having been rolled in matrix, matrix is on gneissic rocks; basal part commonly contains small dark milled aggregate of indistinguishable mineral subrounded fragments as large as 2 em of granitic(?) 1 -rocks; uppermost part white, massive. Crystallized ally equal proportions, 3 to 7 percent biotite (generally from sandstone. as scattered euhedral tablets) and a total of less than 2 percent accessories (sphene, apatite, zircon, mag­ Phyllite.--Dark-gray, hard, thin-bedded, shaly, netite, and rarely hornblende). Weathered roclc buff phyllite composed of finely divided biotite, muscovite, white, weakly coherent. quartz, feldspar, and iron oxides. Forms lenses as thick as 250 feet. Crystallized from shale. Quartz monzonite porphyry.--A local facies of quartz monzonite that contains potassic feldspar Furnace Limestone phenocrysts as long as 2 em. Named by Vaughan (1922, p. 344, 352-365, and CENOZOIC SEDIMENTARY AND VOLCANIC map) for Furnace Canyon, the type locality, in Lucerne ROCKS Valley quadrangle. White to less· commonly blue-gray, poorly bedded to massive, medium- to coarsely Potato Sandstone of Vaughan (1922) crystalline marble composed mostly of clacite and some dolomite; includes occasional lenses a few feet Strongly consolidated stream-laid sedimentary thick of pink calc-silicate hornfels and dark-gray rocks. Age, Tertiary, probably Miocene but possibly micaceous phyllite; exposed thickness about 1,500 Pliocene. The following units were mapped: feet, top eroded; conformable on Saragossa Quartzite. Conglomerate.--Pinkish-gray to buff, hard, bed­ Crystallized from limestone. Unfossiliferous • .Age, ded conglomerate composed of cobbles and pebbles of P a 1 eo zoic. presumably Carboniferous (Richmond, granitic rocks and some schist in matrix of medium­ 1960, p. 16-17). to coarse-grained arkosic sandstone. About 2,000feet thick. Contains some interbeds of sandstone and MESOZOIC PLUTONIC ROCKS reddish-gray siltstone. Lens as thick as 200 feet of granodiorite(?) breccia at base. Unconformable on Granodiorite pre-Tertiary rocks. Grades upward into sandstone. Light-gray gneissoid to massive medium-grained Sandstone.--Buff, hard, bedded, fine- to coarse­ granitic rock composed of about 10 to 20 percent grained, arkosic sandstone; locally contains granitic quartz, 15 to 30 percent potassic feldspar, 30 to 50 pebbles; contains some interbeds of micaceous gray percent plagioclase (oligoclase-andesine), 7 to 30 siltstone. About 1,000 feet exposed; top eroded. percent biotite, and a total of less than 5 percent horn­ blende, iron oxides, sphene, and secondary chlorite. Santa Ana Sandstone of Vaughan (1922) Small masses near Raywood Flat· mostly massive, with less than 10 percent dark minerals. Gneissoid Formation as thick as 2,000 feet; unconformable facies in Allen Peak area may have recrystallized on pre-Tertiary rocks; top eroded; unfossiliferous. from Precambrian(?) gneiss, presumably in Mesozoic Age, presumably Tertiary, most probably Pliocene on time. basis of correlation with similar formation in Cajon Pass area. The following units were mapped: Dioritic rocks Basalt.--Black, friable-weathering, fine-grained Dark-colored, medium- to coarse-grained, mafic basalt, composed.of plagioclase, augite, a little olivine, plutonic rocks intrusive into gneissic and metasedi-. and iron oxides; contains scattered small vesicles mentary rocks. Age, possibly late Jurassic or early commonly filled with calcite, zeolite, or silica. Forms Cretaceous. Composed of the following types: basal lens less than 60 feet thick near Wildhorse Creek only. Hornblende diorite gabbro. --Dark-gray to black, generally massive but rarely gneissoid, medium­ Sandstone.--Light-gray to buff, bedded, friable, grained mafic rocks composed mostly of plagioclase fine- .to coarse-grained arkosic sandstone about 2,000 and· hornblende in variable proportions, and small feet thick; include~ some interbedded light -red to gray, amounts of biotite, chlorite, epidote, iron oxides, and micaceous, sandy siltstone, and quartz-monzonite­ accessories. pebble conglomerate. Quartz diorite.--Medium-gray,\massivemedium­ Older surficial sediments grained plutonic rock COplpCSed Of about 50- tO 60 per­ Cent plagioclase (andesine) and a total of 40 to 50 Slightly consolidated alluvial deposits derived percent quartz, biotite, and hornblende, including about from pre-Tertiary rocks of adjacent mountains. Much 2 ·percent accessories· (sphene, apatite, iron oxides). dissected and preserved only as erosional remnants. Age, p~esumably Pleistocene. Composed of the follow­ Quartz monzonite ing units, with unconformity at base
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