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Placerita-Soledad-Vasquez Rocks Area PLACERITA-SOLEDAD-VASQUEZ ROCKS AREA SOLEDAD BASIN LOS ANGELES COUNTY, CALIFORNIA Prepared for the' 1965 FIELD TRIP of AMERICAN ASSOCIATION OF PETROLEUM GEOLOGIST PACIFIC COAST SECTION © AAPG Pacific Section, 2009 ‐ Placerita-Soledad-Vasquez Rocks Area, Soledad Basin, Los Angeles Co., California (1965) 1965 ANNUAL FIELD TRIP -GENERAL CHAIRMAN Harry Nagle, Standard Oil Company, Ventura FIELD TRIP CHAIRMAN Robert J. Hindle, Sunray DX Oil Company, Newhall FOOD CHAIRMAN James Saunders, Tidewater Oil Company, Ventura CONTRIBUTORS AND COMMITTEES Dr. John Crowell, University of California at Los Angeles Dr, Perry Ehlig, Los Angeles State College F, J. Karmelich, Sunset International Oil Company, Los Angeles Robert Morrison, Richfield Oil Corporation, Bakersfield Dr, Gordon Oakeshott, California State Division of Mines & Geology, San Francisco . Dr. James Slosson, Los Angeles Valley College John Todhunter, Sunray DX Oil Company, Newhall Roy Turner, Consultant, Ventura Andy Vidos, Consultant, Ventura ACKNOWLZDGMENTS Our thanks to the Los Angeles County Department of Parks and Recreation, State of California Highway.Patro1, State of California Division of Parks and Beaches and United States Department of Interior, Forest Service. Particular thanks to the Drafting section and secretarial staffs of Standard Oil Company of~~alifornia,Sunray DX Oil Company, and all .....- contributors. Sns I"r<ns,\snoQ~~A~~I~,~~~I,X-~AK~~~IIOTT [Ti\1;1.l72 GENERALiZED GEOLOGiC COLUMN NORTH OF SAN GABRIEL FAULT ,..-...... "... FORMATIOH ACE OR MEMBER LITHOLOGY Tn'CKNESS DESCRIPTION 1 1 FEETI I Allurtum Coarse .and, ~rarcl,nnd boulder. of 6-t. Chlllnr t .o • *- - -- . -. and Its trlbutnrlce. F.nglmcnte, .%rear tcrrac. &ravel., older olluvln. Brom ~d redbleh-brovn, poorly earled conglmenta , and fonglaernte, :oldcd. Llght-colored, poorly oortcd, looaely conmolldated non- 650 ( osrlne con6lamentc nnd cmrae randatone; flurimtila and alluvial-fen deposlta. Ron-wrlne fluriatlle,lacu#trlne. and brscklah-mter QV Svnrntne Roncn morm-.. - 1.300 grsrcl, brom and geenlsh aandntone, *anQJ audstone, :....*..-- .'... conglcmcmte mnd thln whlte fieahmeter llwmtaw bed.. ! I . .. .. .. ... Herlne brovnlsh aandetone, elltatone and conglmente . .. In the Ssn Csbriel fault sonc. Hot found nortb of the *- ..e e-..-. fault. 9 Xarlne gray and bromieb-gay elltstonc, flne-(prlned I I LOWER / RepeIIo Im. 500 . .. he&. PLIOCENE sandstone, rmdntone; pebble and boulder I Herlne buff and gray sandstone, silty able, dlatowcrgua ehnle, mod conglmerate. I UPPER Fine- to cmrse-anined more or lean vell-conmoll&ted nan. psrlne eedlmente of fluvlatllc and lncustrlne orl&lnl red - MIOCEHE and reddlsb-brom conglmerste and brecclm, wry cmrae P beaal breccia.; yellov, red, and gcenloh aandntone, #lit- a, atone and rmdetone; ccurae gray ssnd.tone and ConglaxnLcl thlo-bedded law- .Iltstone and mlc~lctuff bed.. WI . MIOOLE ---------- Fluvlatlle and lncustrlne reddlsb mendatone, .llt.tone mnd .I-----------; 600 TOLO'UER T~chConyonfm. - clnystonc, and py, tan, and reddish conglcocnte, uwW MIOCENE m,.".;well-cemented and well-strat Ifled. -'- -'- I un~onlarm,lr Non-mnrlnc light-colored and highly colored red, pllov, LOWER and burr enndetone, conglomeretc, fonglmerrte, and MIOCEXE leeser proportlona of mudetone end etmlc; flovaof blnc'r Vorpuez lm. and reddlsh veslculnr bnsnlt and nndemlte, purp1l.b brcccla, TO J?PER and mlnor beda of llthlc turf; borate-snd gypmum-be-rlng EOCEFiE shale and eandntone. Honolltbologlc breccum u* chrac- krtatle of part. of the forstton. 1 4 .-4-;0i;,- ..;..I - b??ZR 7n~onform,~rcY,u,' 0 - \'Q I- JURASSIC l?i ' sYenile. Dnrk red-veatbering nuglte Md qurts m~ltaapnlt. mad 1 I,, -,I. LG:'/ER I Hornoiende diorlfe - , - #* - ', rehted hornblende dlorlte. I,;* #- 1 '.I 11 ' No1 in contact ' I 4diflfcl+ +I I Z -< Weodenhsll blue-qurta-fe*l.ar gnelo. (e)Intrude4 b~ C anortbo.lte-ebbro rocka (an), -11 Intm&d by Up r D ond O~O~I~OSIIC- -.lc (0-Larcr Crttacrw (8) psitie -b L). -C C qoooro group U I C SAND CANYON - PIACERITA CANYON AREA R. R. MORRISON Richfield Oil Corporation The sediments of the Sand Canyon - Placerita Canyon area lie in a broad syncline formed at the right angle intersection of basement faults bounding the Soledad Basin on the south. 0 - .- - -.. The oldest rocks of the area are the metamorphic and plutonic rocks of the San Gabriel complex, which bound the area on the east and south, and presumably underlie the sedimentary basin. South of the San Gabriel fault the basement consists of metasediments but to the north consists of gneiss and anorthosite with associated gabbroic rocks. The sediments of this part of the Soledad Basin consist of six Terti- ary formations and Quaternary deposits, in unconformable contact with each other. The late Miocelre Tick Canyon formation (~tc?)is a steeply dipping, well-indurated gneiss and schist breccia, in a matrix of dark red silt- stone. Its angularity, clast size ranging up to boulders and lack of sorting suggests deposition at the base of a steep slope with a limited amount of transport. The Mint Canyon formation (Mmc) is locally represented by more than 4500' of continental shales, sands and ridge-forming conglomerates of con- tinental origin. These rocks are light colored, and contain water-laid tuff beds and fresh water fossils. A thick shale member of this fonnation is the source for the large landslides in the central part of the map. This late Miocene formation is known only north of the San Gabriel fault. The Castaic formation (MC)is the time and lithologic equivalent of the Mohnian (u. Miocene) Modelo.fomtion of the Ventura Basin and my ' once have been continuous with it. Fifteen miles north at its type local- ity the Castaic formation is sandy to conglomeratic and may be a shallow water facies of the silicious and diatomaceous shale present at Sand Canyon. The Towsley formation (OR) is the oldest formation present on both sides of the San Gabriel fault. Here it is a flat-lying brown siltstone and 16 the time equivalent of the Repetto formation of the Los Angeles Basin. Overlying all of the older beds is the,continental Saugus formation (QS) wlth its brackish water equivalent, the Sunshine Ranch member (Qssr ) . The Saugus formation is a highly cross-bedded and lenticular, rust colored pebble and cobble conglomerate of upper Pliocene and Pleistocene age. The San Gabriel right lateral slip fault traverses the area along its southern border and has profoundly affected local structure and.regiona1 stratigraphy. Deformstion and movement along the fault have occurred more or less continuously throughout the Tertiary. Locally, the San Cabriel fault shows more than 6000' of vertical movement, down to the north. Dips of 40" to 68" north have been measured in the fault plane. Wells on the north end of the Placerita field penetrate the fault and verify its north- erly dip. The major differences between basement and sedimentary rocks on opposite sides of the fault are considered simificant evidence for large scale horizontal movement along the San Gabriel fault. The Placerita fault is a typical branch of the San Gabriel, taking up scme of the mjor movement along the fault zone. This fault borders basement rocks and is separated from the main trace of the San Gabriel fault by a Saugus -filled graben. @ The Whitney Canyon fault and Iron Canyon faults are large scale base- ment faults that intersect the San Gabriel fault on opposite sides. Latest movement on the Whitney Canyon fault is the reverse of the base- ment movement and forms the closure on the east side of the Placerita field. 'Be general synclinal nature of the area has persisted due to the constant uplift of the basement rocks. Younger formations tend to be pre- serv.ed on synclinal hills. The area will continue to be important to the problem of lateral slip on the San Gabriel fault due to its location at the juncture of sediments and basement rocks along the major faults. GZGLOGY OF TEE PRZ-CENOZGIC BASEMELT TERRAXE BCRDEXIKC THE SCLEDAD 98SIN by P. L, Ehlig Introduction The sedimentary formations of the Soledad Basin are largely composed of material eroded from pre-Cenozoic basement terrane to the north and east of the basin. The basement terrake includes at least efx- major rock units: ( 1 ) Mendenhall gneiss, ( 2) anorthosite-gabbro complex, (3) Lowe granodiorite, (4) Placerita formation, (5) granftic rocks (quartz diorite, granodiorite, and quartz monzonite), and (6) Pelona schist. Each unit contains distinctive rock types that are easily recogni'zecT in clasts of pebble-size or larger. Except for the granitic rocks, each unit crops out within 8 limited geographic area as shown on the attached geologic map. Contacts between rock units are generally steep and have probably undergone insignificant erosional displacement of their outcrop traces since Miocene time. Thus, a knowledge of the basement terrane could be of great value to a study of sedimentary formaticns within the Soledad Basin. Mendenha11 Gneiss Lavender-blue quartz tints the Mendenhall gneiss a distinctive blue-gray color. Similar quartz is found sparingly in some nortions of the anorthosite-gabbro comnlex, but is not fcund in the other basement rocks. ,The Mendenhall gneiss, the oldest dated rock in southern California, is more than 1.2 billion years old (silver and others, 1963). It includes quartzo-feldapathic rocks and amphibolite which were metamorphosed under conditions ,of the granulite f acies during Precambrian time. subsequent remetamorphism under amphibolite facies conditions has destroyed many of the original mineral assemblages. The lavender-blue quartz and white to gray.perthita are the moat widely preserved relscs of the granulite metamorphism. Originally abundant pyroxane and garcet have been largely replaced by biotite and hornblende. The rock is highly distinctive where equant crystals of hypersthene and garnet have been replaced by fine-grained platy aggregates of red-brown biotite. Clasts from the hiendenhall gneiss are abundant in Pliocene and younger rocks to the south of the San Gabriel fault, but are only sparingly present in formations to the north of the fault.
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