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PARRISH, Ph.D., STATE GEOLOGIST PRELIMINARY GEOLOGIC MAP OF ONSHORE PORTIONS OF THE CRESCENT CITY AND ORICK 30' x 60' QUADRANGLES, CALIFORNIA Compilation and Digital Preparation by Marc Delattre and Anne Rosinski 2012 Copyright © 2012 by the California Department of Conservation. All rights reserved. No part of this publication may be reproduced without written consent of the California Geological Survey. The Department of Conservation makes no warranties as to the suitability of this product for any particular purpose. 41°00' 42°00' 124°00' 124°52'30” 124°52'30” 124°00' 42°00' Projection: Uiversal Transverse Mercator, Zone 10N, North American Datum 1927. Topographic base from USGS Crescent City and Orick 30'x60' quadrangles, 1983. Shaded relief image derived from USGS 1/3 arc-second National Elevation Dataset (NED). This geologic map was funded in part by the U.S. Geological Survey National Cooperative Geologic Mapping Program, STATEMAP Award no. G11AC20220. Geology compiled 2011-2012 41°00' STATE OF CALIFORNIA - EDMUND G. BROWN JR., GOVERNOR NATURAL RESOURCES AGENCY - JOHN LAIRD, SECRETARY DEPARTMENT OF CONSERVATION - MARK NECHODOM, DIRECTOR 41°30' 41°30' 124°15' 124°15' CRESCENT CITY ORICK CRESCENT CITY AND ORICK 30' x 60' QUADRANGLES, CALIFORNIA Preliminary Geologic Map available from: http://www.conservation.ca.gov/cgs/rghm/rgm/preliminary_geologic_maps.htm SCALE 1:100,000 6 Miles 2 0 2 4 2 0 2 4 6 Kilometers Contour Interval: 50 meters APPROXIMATE MEAN DECLINATION, 2012 15.27° TRUE NORTH MAGNETIC NORTH ? 27 ? D U 25 25 Contact between map units - Hashed where gradational; solid where accurately located, dashed where approximately located; short dash where inferred; dotted where concealed; queried where uncertain. Fault - Solid where accurately located; dashed where approximately located; short dash where inferred; dotted where concealed; queried where uncertain; bar and ball on downthrown side. U = upthrown block, D = downthrown block. Thrust fault - Sawteeth on upper plate; solid where accurately located; dashed where approximately located; short dash where inferred; dotted where concealed; queried where existance uncertain Anticline - Solid where accurately located, dashed where approximately located; dotted where concealed. Syncline - Solid where accurately located, dashed where approximately located; dotted where concealed. 25 25 25 ? ? 25 25 SYMBOL EXPLANATION ? Strike and dip of bedding: Inclined Vertical Overturned Crumpled Approximate Strike and dip of foliation: Iinclined Vertical Strike and dip of joints or fractures Strike and dip if igneous layering Strike and dip of dike walls Landslide - arrows indicate principal direction of movement. QUATERNARY TERTIARY CRETACEOUS JURASSIC Holocene Pleistocene Miocene Pliocene MESOZOIC CENOZOIC CRESCENT CITY ORICK Trinidad Crescent City 0 10 20 5 Kilometers 0 6 12 3 Miles Pacific Ocean ABBREVIATED INDEX TO GEOLOGIC SOURCE DATA 9 6 1 5 7 3 2 4 10 11 8 t u t u t u t u 0 6 12 s r e t e m o l i K 3 0 1 5 0 s e l i M 5 . 2 (SEE PAMPHLET FOR COMPLETE REFERENCES) 1. Harper, 1980; Elder and Reichert, 2010; Evans, 1984; Stone, 1983, for Wimer Formation; Quaternary mapping by Delattre, this study. 2. Davenport, 1983b; Aalto, 1981; Quaternary mapping by Delattre, this study. 3. Davenport, 1983c; Back, 1957; Aalto and others, 1981; Quaternary mapping by Delattre, this study. 4. Davenport, 1983a; Back, 1957; Aalto and others, 1981; Stone, 1983, for Wimer Formation; Quaternary mapping by Delattre, this study. 5. Davenport, 1982; Back, 1957; Aalto, 2006, for Point St. George area; Polenz and Kelsey, 1999; Quaternary mapping by Delattre, this study. 6. Davenport, 1984a; Aalto and Harper, 1982; Wills, 2000; Ristau, 1979; Quaternary mapping by Delattre, this study. 7. Davenport, 1984b; Aalto and Harper, 1982; Quaternary mapping by Delattre, this study. 8. Aalto and others, 1981; Cashman and others, 1995; Kelsey and Trexler, 1989. 9. Dell’Osso and others, 2003; Cashman and others, 1995; Hardin and others, 1982; Aalto and others, 1981; Quaternary mapping by Delattre and Rosinski, this study. 10. Aalto and others, 1981; Quaternary mapping by Delattre and Rosinski, this study. 11. Aalto and others, 1981; Carver, 1992, Woodward-Clyde Consultants, 1980, and Aalto, 1989b for marine terraces; Quaternary mapping by Delattre and Rosinski, this study. 42°0'0" 41°30'0" 41°30'0" 124°0'0" 41°0'0" 124°0'0" 41°0'0" 125°0'0" 42°0'0" 125°0'0" INDEX MAP OF 7.5’ QUADRANGLES (Happy Camp) (Hoopa) (Eureka) WITHIN THE CRESCENT CITY AND ORICK 30’ X 60‘ QUADRANGLES ch mg u gr ms gs gs mv sp gs Tsg Twi KJfm KJfbf KJfmc KJfmg KJfc KJfg KJfl KJfpp KJfrc sp Jdc Jgb Jpd Juc spm Franciscan Complex - Central Belt Mélange of the Central Belt (Late Cretaceous to Late Jurassic) Greenstone block within mélange Franciscan Complex - Eastern Belt Broken formation (Early Cretaceous to Middle Jurassic) Mélange unit of Crescent City area (Early Cretaceous to Middle Jurassic) Blocks within mélange: Blocks within mélange: Greenstone Greenstone Metagraywacke Chert Undifferentiated Transitional rocks of the Grogan Fault Zone (Cretaceous to Jurassic) Coherent unit of Lacks Creek (Cretaceous to Jurassic) Redwood Creek watershed units of Hardin and others (1982) Metagraywacke (Cretaceous to Jurassic) Incoherent unit of Coyote Creek (Cretaceous to Jurassic) Redwood Creek Schist (Early Cretaceous to Late Jurassic) Interbedded metatuff Serpentinite block Patricks Point unit of Aalto and others, 1981 (Cretaceous to Jurassic) Klamath Mountains Province - Western Jurassic Belt Josephine Ophiolite of Harper (1980) Dike Complex (Late Jurassic) Gabbro (Late Jurassic) Cumulate ultramafic rocks (Late Jurassic) Sheared serpentinite (Jurassic) Serpentinite matrix mélange (Jurassic) Granitic rocks Metasedimentary rocks Peridotite (Late Jurassic) af Qhc Qht Qe Qls Qa Qf Qt Qby Qmt Qmt 1 Qmt 2 Qmt 3 Qmt 4 Qmt 5 Qmt 6 Qsc Qu Marine terrace deposits (Pleistocene) Trinidad marine terraces; names and approximate ages (ka=1000 years) from Woodward-Clyde Consultants (1980), and Carver (1992): Patricks Pt. terrace, age 64 ka Savage Creek terrace, age 83 ka, and McKinleyville terrace, age 96 ka Westhaven terrace, 103 ka Fox Farm terrace, 120 ka, and Sky Horse terrace, 130 ka A-Line terrace, 176 ka and older Maple Stump terrace, 200+ ka Terrace gravels of Surpur Creek (Pleistocene) Prairie Creek Formation (early Pleistocene to late Pliocene) Undifferentiated marine and nonmarine overlap deposits (Pleistocene to late Pliocene?) Wimer Formation (late Miocene) St. George Formation (late Miocene) Stream channel deposits (latest Holocene) Beach deposits (latest Holocene) Young alluvial deposits, undifferentiated (Holocene) Young alluvial fan deposits (Holocene) Dune sand (Holocene) Estuarine deposits (Holocene) Landslide deposits (historical to Pleistocene) Alluvial deposits, undifferentiated (Holocene to latest Pleistocene) Alluvial fan deposits (Holocene to Pleistocene) Stream terrace deposits (early Holocene to Pleistocene) Battery Formation (late Pleistocene) Artificial fill (historical) Young stream terrace deposits (Holocene) ABBREVIATED EXPLANATION (Approximate stratigraphic relationships only; see pamphlet for more detailed information) Qbs Qds Qha Qhf QTpc