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Notice Concerning Copyright Restrictions NOTICE CONCERNING COPYRIGHT RESTRICTIONS This document may contain copyrighted materials. These materials have been made available for use in research, teaching, and private study, but may not be used for any commercial purpose. Users may not otherwise copy, reproduce, retransmit, distribute, publish, commercially exploit or otherwise transfer any material. The copyright law of the United States (Title 17, United States Code) governs the making of photocopies or other reproductions of copyrighted material. Under certain conditions specified in the law, libraries and archives are authorized to furnish a photocopy or other reproduction. One of these specific conditions is that the photocopy or reproduction is not to be "used for any purpose other than private study, scholarship, or research." If a user makes a request for, or later uses, a photocopy or reproduction for purposes in excess of "fair use," that user may be liable for copyright infringement. This institution reserves the right to refuse to accept a copying order if, in its judgment, fulfillment of the order would involve violation of copyright law. JUXTAPOSED TERTIARY STRATA ALONG THE SAN ANDREAS FAULT IN THE TEMBLOR AND CALIENTE RANGES, CALIFORNIA By J. G. Vedder channel deposits of a deep-sea fan. An U. S. Geological Survey additional 2,820 feet ( 860 m) of sandstone Menlo Park, California and shale was penetrated in an exploratory well, but it is not known whether these ABSTRACT strata are underlain by Upper Cretaceous sedimentary rocks or basement, or both. Remnants of Tertiary marine basins that Directly across the San Andreas fault, formerly transgressed the central segment however, wells have not penetrated Paleo- of the San Andreas fault are preserved in cene beds, and they may not be present the southern Coast Ranges. On opposite there. Along the north side of the San sides of the fault, rocks of the same age Emigdio Mountains, about 5 to 20 miles contain unlike stratal sequences that ( 8 to 32 km ) southeast of the Temblor record dissimilar paleoenvironments. Re- Range, basement rocks are overlapped by constructions based upon provenance and Eocene strata both at the surface and in depositional patterns suggest post-middle the subsurface. In the northern Temblor Miocene strike-slip separation of as much Range, Paleocene beds that are mostly as 185 miles ( 300 km ) and post-early younger than the Pattiway Formation are Pliocene separation of nearly 50 miles exposed, but their extent southward in the ( 80 km ). subsurface is in dispute ( Dibblee, 1973a ). INTRODUCTION In the southeastern Caliente Range, the type section of the nonmarine Simmler In the southeastern Temblor-and Caliente Formation is composed primarily of lenti- Ranges, late Cenozoic marine and nonmarine cular variegated beds of mudstone and sedimentary sequences that are separated sandstone with subordinate conglomerate. by the San Andreas fault represent sharply The formation is unconformable on the contrasting basin histories. Comparison Pattiway Formation, and most of the of thicknesses, depositional environments, sequence in the type area suggests a shoreline positions, source terranes and flood plain environment with local faunal facies across the fault reveal lacustrine conditions. Elsewhere in the striking mismatches, particularly in rocks region, particularly in the southeastern of Miocene age. Strata that are now La Panza Range and Cuyama Badlands, contiguous can be restored to their conglomeratic facies of the Simmler Forma- original position only by large scale tion imply deposition in coalescing strike-slip separation. Although the alluvial fans along an elongate, north- displaced counterparts of the rock units west-oriented basin ( Bartow, 1974). The described lie beyond the limits of the age of the formation is uncertain; it may area, they are briefly reviewed because incorporate strata as old as Eocene and regional palinspastic reconstruction and as young as early Miocene, but an timing of fault movement are contingent Oligocene (?) age generally is accepted. upon inferred amounts of offset. Northeast of the San Andreas fault, PALEOGENE opposite the type section of the Simmler Formation, it is inferred that marine strata deeply buried beneath the Temblor The Pattiway Formation, a marine mud- Range may be partly equivalent in age to stone, sandstone, and conglomerate unit of the lower beds in the Simmler; presumably Paleocene age ( Dibblee, 1973a; Vedder, in they include the upper beds of the Point press ), is exposed in the southeastern- of Rocks Sandstone and the Kreyenhagen most part of the Caliente Range ( Fig. 1 ). Shale ( H.C. Wagner, J.A. Bartow, and A 3,500-foot ( 1,070 m) outcrop section R.L. Pierce, unpub. data). In the north- ( Fig. 2,3), which displays much lenticular western Temblor Range, the Point of Rocks and truncated bedding and contains bathyal Sandstone probably represents bathyal foraminiferal assemblages, may represent fan deposition in a late Eocene sequence 234 CALIFORNIA DIVISION OF MINES AND GEOLOGY 10 3-0042 plo 2./ 042-1*-... TO ro Er-% A AUVN831vnb AB,11831 -0-crt : 1/1 .:.f..... roC- g 1a 51 22.:f.:: li:HER.,1/1 1e L 5 67" E-7• 514.'Fer"E Ros 111111111i1111 % 4-1ul -00 3 1.•:lim 11••112Im....I: .,611'•·.•718&.:,11'•:I. 82./ill 63%1·>W : .. · f7// #4..'/7A .<fdi .-CO-0 • «' i - - i 111•11•).••if i i Ly: /4.:•: 0> : X E Z Z: 14.155AE,1 I I. 6 Ur OL00 Oki E + 1-4- ++ CYU' + 0 0-0 . ..... 0 4-' e •111111• ...•..•,0 ""3•li.••••i•••••i• :.F: :ZE <3 10 .e+S \ =C) '-(f)••4-042-- 11111:•111•11...4 1 ..G.0 .* •,1 1,0 ..4.&(Ii#•11/ 4 .: OX + #11 u S.OIl 0 1161-1 4-0 ill042 6 ++ (D 1-' 9/2- .::liIft:lii i 82 11%1.:14111•1 i 03 ++ m.. 03 62 1511'11 6 ..C .:I:,11|11.'.6 '1" .' 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L_CQ 4-1 .' .....••'.i e•• il. ezzl•. r-=-1 3. / Ili•li•I••il'ifi 1150 - 1 -mI * . CDiC042- .««'»036I •F i-0.-----I')-\\Il·..i•=-r=3-2•--•CZZ\\\\ir ""F.SE= ,"1..0361•1 :i larZ: .e(.r) 11i!11211 .,XY------7•::::1• 1I.8 :.Ki -t-J 11IWSL, I /72--i.\.\33\\\\4:URNiEEE)' 0 0# luNDRUN/lillI.\\\\ 33L O 02& -El I ,-' 01 L 0to 0 ....Lt- +Jul ro r')lo 235 CALIFORNIA DIVISION OF MINES Al\ID GEOLOGY CALIENTE RANGE SOUTHEAST TEMBLOR RANGE provincial age Unit, stage or age, dominant rock types, local maximum thickness Provincial age Unit, stage or age, dominant rock types, local maximum thickness Pleistocene? Morales Formation (Blancan) pleistocene Paso Robles Fonnation (SW slope) , Tulare Formation (NE slope) I-? - nonmarineconglomerate, mudstone, sandstone 3,800 ft (1,160 m) .-*--- Il-*.Ill- shale-pebble gravel, nonmarine 1,700(?)ft (520 m) "Panorama Hills Formation" San Joaquin Formation Quatal Forruation (Hemphillian) Pliocene gravel,<036Jacalitos")nonmarine; unnamed EtchegoinsubsurfaceFormationonly Pliocene nonmarineclaystone, sandstone 1,000 ft (300 m) sandstone, marine 2,000 ft(610 m) 3,200 ft(975 m) Santa Margarita· Formation Bitterwater(Mohnian)Creek Shale Reef Ridge Shale (Mohnian;sandstone"Margaritan") Basalt claystone, shale subsurface(Delmontian?,onlyor Mohnian) marine 2,700 ft (820 m) F6rmationCaliente (Clarendonian) marine 3,000 ft(915 m) 500 ft(150 m) Whiterock Bluff Basalt Santa Margarita Formation rr • Shale(Luisian,MemberRelizian) (Barstovian) conglomerate,("Margaritan")sandstone /1rl MILure(Mohnian,ShaleLuisianMemb•r) • siliceous shale Branch Canyon marine3,000 ft(915 m) diatomaceousconglomerate,shale,sandstone . marine 500 ft (150 m) Sandstone("Temblorian") 1 lal«l't A*-**M#**Mv--*.%-0 marine 3,000 it(915 m) :0 Saltos Shale Member marine (Hemingfordian) Miocene Monterey Shale 1• mudstone,(Temblorian,siltstone,"Vaquerosian'042) 1,500 ft(460 m) mudstone, Gould(Luisian,and DevilwaterRelizian) Shale Members marine 3,800 ft(1,160 m) sandstone, marinesiliceous shale, sandstone,2,500 ft(760 m) Miocene Painted(Saucesian;Rock Sandstone"vaquerosian")Member nonmarineconglomerate • marinesandstone,5,SOOmudstone,ft(1,680conglomeratem) (Arikareean) Temblor Formation (8 named members) I 4,250 ft (1,300 m) (Relizian, Saucesian, Zemorriant • Soda,(Saucesian,Lake ShaleZemorrian;Member "Vaquerosian") sandstone,"Temblorian",claystone"Vaquerosian", unnamed) 2• mudstone,marine 2,400silistone,ft (730sandstonem) marine 7,800 ft(2,380 m) •IS(D Quail Canyon Sandstone Member Oligocene Wagonwheel(RefugianFormationin type area) > sandstone("Vaquerosian") subsurface (?) marine 500 ft (150 m) Point(Narizianof RocksinSandstonetype area) Simmler Formation Eocene subsurface (7) oligocene nonmarinesandstone, mudstone, conglomerate 3,800 ft (1,160 m) Kreyenhagen Shale -' --- subsurface(Narizian in(?)type area) Paleocene Pattiway("ynezian;Formation"Martinez") marinesandstone, mudstone, conglomerate 6,300 ft (1,920 m) Figure 2.
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