Spill Prevention, Control
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Preliminary Digital Geological Map of the 30' X 60' Santa Ana Quadrangle, southern California, version 2.0 Compiled by D. M. Morton1 Version 2.0 digital preparation by Kelly R. Bovard1 and Rachel M. Alvarez1 - 2004 Version 1.0 digital preparation by Rachel M. Hauser1 and Kelly R. Bovard1 - 1999 1Western Surficial Processes Team, U.S. Geological Survey Department of Earth Sciences, University of California, Riverside CA 92521 Pamphlet to accompany Open-File Report 99-172 Version 2.0 - 2004 SCAMP-Southern California Areal Mapping Project A geologic-mapping project sponsored jointly by the U.S. Geological Survey and the California Geological Survey U. S. DEPARTMENT OF THE INTERIOR U. S. GEOLOGICAL SURVEY Any use of trade, product, or firm names is for descriptive purposes only and does not imply endorsement by the U. S. Government. Table of Contents (Blue text indicates hyperlink) Hyperlink index to geologic units ii Units Qaf—Artificial fill to Qvor—Very old regolith iii Units Pauba Formation to Td—Diabase intrusive rocks iv Units Tvss—Vaqueros, Sespe, Santiago, and Silverado Formations, undifferentiated to Kgh—Hypabyssal tonalite v Units Kgct—Coarse-grained biotite-hornblende tonalite to }ds—Metadunite and serpentinite vi Units }sm—Serpentinized metadunite containing magnesite veins to |ms—Marble and schist, undifferentiated Figure 1. Index map showing locations and features referred to in the text Figure 2. Index map showing sources of mapping and digital preparation Geologic setting Summary of major structural elements Faults Quaternary sedimentary deposits Quaternary-Tertiary deposits Neogene deposits Paleogene deposits Mesozoic rocks Sedimentary rocks Peninsular Ranges batholith Volcanic and hypabyssal rocks Metamorphic rocks Notes regarding features and conventions used in the map and database of the Santa Ana 30' X 60' Quadrangle Description of Map Units References Sources of mapping used in the Santa Ana 30' x 60' quadrangle listed by 7.5' quadrangle Digital preparation of individual 7.5' quadrangles i Hyperlink index to geologic units Qaf—Artificial fill (Recent) Qof—Old alluvial fan deposits (late to middle Pleistocene) Qw—Wash deposits (late Holocene) Qofv—Old alluvial fan deposits and young alluvial valley deposits Qw3—Wash deposits, Unit 3 (late Holocene) (late Pleistocene) Qf—Alluvial fan deposits (late Holocene) Qof3—Old alluvial fan deposits, Unit 3 (middle Pleistocene) Qf1—Alluvial fan deposits, Unit 1 (late Holocene) Qof1—Old alluvial fan deposits, Unit 1 (middle Pleistocene) Qa—Axial channel deposits (late Holocene) Qoa—Old axial channel deposits (late to middle Pleistocene) Qv—Alluvial valley deposits (late Holocene) Qoa7—Old axial channel deposits, Unit 7 (middle Pleistocene) Qsw—Slope wash deposits (late Holocene) Qoa3—Old axial channel deposits, Unit 3 (middle Pleistocene) Qc—Colluvial deposits (late Holocene) Qoa1—Old axial channel deposits, Unit 1 (middle Pleistocene) Qls—Landslide deposits (late Holocene) Qov—Old alluvial valley deposits (late to middle Pleistocene) Qe—Eolian deposits (late Holocene) Qoc—Old colluvial deposits (late to middle Pleistocene) Qm—Marine deposits (late Holocene) Qols—Old landslide deposits (late to middle Pleistocene) Qes—Estuarine deposits (late Holocene) Qop—Old paralic deposits, undivided (late to middle Pleistocene) Ql—Lacustrine deposits (late Holocene) Qop7—Old paralic deposits, Unit 7 (late to middle Pleistocene) Qlv—Lacustrine and fluvial deposits (late Holocene) Qop6—Old paralic deposits, Unit 6 (late to middle Pleistocene) Qyw—Young wash deposits (Holocene and late Pleistocene)— Qop4—Old paralic deposits, Unit 4 (late to middle Pleistocene) Qyf—Young alluvial fan deposits (Holocene and late Pleistocene) Qop3—Old paralic deposits, Unit 3 (late to middle Pleistocene) Qyf7—Young alluvial fan deposits, Unit 7 (late Holocene) Qop2—Old paralic deposits, Unit 2 (late to middle Pleistocene) Qyf6—Young alluvial fan deposits, Unit 6 (late Holocene) Qop1—Old paralic deposits, Unit 1 (late to middle Pleistocene) Qyf5—Young alluvial fan deposits, Unit 5 (late Holocene) Qop2-6—Old paralic deposits, Units 2-6, undivided (late to middle Qyf4—Young alluvial fan deposits, Unit 4 (late and middle Holocene) Pleistocene) Qyf3—Young alluvial fan deposits, Unit 3 (middle Holocene) Qop3-6—Old paralic deposits, Units 3-6, undivided (late to middle Qyf2—Young alluvial fan deposits, Unit 2 (early Holocene) Pleistocene) Qyf1—Young alluvial fan deposits, Unit 1 (early Holocene and late Qopf—Old marine deposits (late to middle Pleistocene) Pleistocene) Qos—Old surficial deposits, undivided (late to middle Pleistocene) Qya—Young axial channel deposits (Holocene and late Pleistocene) Qvof—Very old alluvial fan deposits (middle to early Pleistocene) Qya6—Young axial channel deposits, Unit 6 (late Holocene) Qvof3—Very old alluvial fan deposits, Unit 3 (early Pleistocene) Qya5—Young axial channel deposits, Unit 5 (late Holocene) Qvof1—Very old alluvial fan deposits, Unit 1 (early Pleistocene) Qya4—Young axial channel deposits, Unit 4 (late and middle Qvoa—Very old axial channel deposits (middle to early Pleistocene) Holocene) Qvoa5—Very old axial channel deposits, Unit 5 (middle to early Qya3—Young axial channel deposits, Unit 3 (middle Holocene) Pleistocene) Qyv—Young alluvial valley deposits (Holocene and late Pleistocene) Qvoa4—Very old axial channel deposits, Unit 4 (middle to early Qyv1—Young alluvial valley deposits, Unit 1 (early Holocene and Pleistocene) late Pleistocene) Qvoa3—Very old axial channel deposits, Unit 3 (middle to early Qyc—Young colluvial deposits (Holocene and late Pleistocene) Pleistocene) Qyls—Young landslide deposits (Holocene and late Pleistocene) Qvoa2—Very old axial channel deposits, Unit 2 (early Pleistocene) Qye—Young eolian deposits (Holocene and late Pleistocene) Qvoa1—Very old axial channel deposits, Unit 1 (early Pleistocene) Qypt—Young peat deposits (Holocene and late Pleistocene) Qvov—Very old alluvial valley deposits (late to early Pleistocene) Qow—Old alluvial wash deposits (late to middle Pleistocene) Qvols—Very old landslide deposits (middle to early Pleistocene) Qvop—Very old paralic deposits (middle to early Pleistocene) Qvor—Very old regolith (Pleistocene) ii Pauba Formation (Pleistocene) Tc—Capistrano Formation (early Pliocene and Miocene) Qps—Sandstone member Tco—Oso Member Qpf—Fanglomerate member Tcs—Siltstone facies Qlh—La Habra Formation (Pleistocene) Tme—Mount Eden Formation of Fraser (1931) (early Pliocene and Sandstone and conglomerate of Wildomar area (Pleistocene and late Miocene) Pliocene) Tmeus—Upper sandstone member (early Pliocene and Miocene) QTws—Sandstone unit Tmem—Mudrock member (early Pliocene and Miocene) QTwc—Conglomerate unit Tmels—Lower sandstone member (Miocene) Qch—Coyote Hills Formation (Pleistocene) Tmea—Arkosic sandstone member (Miocene) Qsp—San Pedro Formation (Pleistocene) Tmeb—Monolithologic tonalite boulder breccia Qsp4—Sandstone Tmec—Conglomeratic sandstone member (Miocene) Qsp3—Siltstone and claystone Tch—Sandstone and conglomerate in southeastern Chino Hills (early Qsp2—Sandstone Pliocene and Miocene) Qsp1—Siltstone and claystone Tp—Puente Formation (early Pliocene and Miocene) San Timoteo beds of Frick (1921) (Pleistocene and Pliocene) Tpsc—Sycamore Canyon Member (early Pliocene and Miocene) Qstu—Upper member (Pleistocene) Tpscc—Mostly conglomerate Qsts—Conglomeratic sandstone beds Tpy—Yorba Member (Miocene) Qstcq—Quartzite-bearing conglomerate beds Tpyc—Mostly conglomerate Tstm—Middle member (Pliocene) Tpsq—Soquel Member (Miocene) Tstd—Highly deformed sandstone, pebbly sandstone, and Tplv—La Vida Member (Miocene) conglomerate Tlm—Lake Mathews Formation (Miocene) Tstl—Lower member (Pliocene) Tcgr—Rhyolite-clast conglomerate of Lake Mathews area (Miocene?) Tstl2—Claystone, siltstone, and sandstone characterized by ripple Tcg—Conglomerate of Lake Mathews area (Miocene?) lamination Tm—Monterey Formation (Miocene) Tstl1—Arkosic sandstone Tvsr—Santa Rosa basalt of Mann (1955) (Miocene) QTs—Unnamed late Cenozoic sedimentary rocks in Riverside and Tvt—Basalt of Temecula area (Miocene) Corona areas (early Pleistocene to late Pliocene?) Tvh—Basalt of Hogbacks (Miocene) QTt—Late Cenozoic conglomerate of Temescal area (early Pleistocene Tvep—Basalt of Elsinore Peak (Miocene) to late Pliocene?) Tsob—San Onofre Breccia (middle Miocene) QTc—Conglomeratic sedimentary rocks of Riverside West 7.5' Tt—Topanga Formation (middle Miocene) quadrangle (early Pleistocene to late Pliocene?) Ttp—Paulerino Member QTn—Late Cenozoic sedimentary rocks of Norco area (early Ttlt—Los Trancos Member Pleistocene to late Pliocene?) Ttb—Bommer Member Tta—Temecula Arkose (Pliocene) Tvem—El Modeno Volcanics (middle Miocene) Tf—Fernando Formation (Pliocene) Tvema—Andesitic volcanic rocks Tfu—Upper member Tvemt—Tuff and tuff breccia Tfuc—Mostly conglomerate Tvemb—Basalt Tfl—Lower member Volcanic intrusive rocks associated with El Modeno Volcanics (middle Tflc—Mostly conglomerate Miocene) Tn—Niguel Formation (Pliocene) Ta—Andesitic intrusive rocks Tns—Sandstone of Norco area (Pliocene) Td—Diabase intrusive rocks iii Tvss—Vaqueros, Sespe, Santiago, and Silverado Formations, Klmm—Melanocratic rocks undifferentiated (early Miocene, Oligocene, and Paleocene) Klmtg—Lakeview Mountains tonalite and granodiorite, Tv—Vaqueros Formation (early Miocene, Oligocene, and late Eocene) undifferentiated Ts—Sespe Formation (early Miocene, Oligocene, and late Eocene) Klmc—Comb-layered gabbro Tvs—Vaqueros and Sespe Formations, undifferentiated (early Klmg—Hypersthene-hornblende