GIS DATA FOR THE GEOLOGIC MAP OF CALIFORNIA: (Version 2.0) COMPILATION BY CHARLES W. JENNINGS1 WITH ASSISTANCE FROM R.G. STRAND AND T.H. ROGERS1 1977 DIGITAL REPRESENTATION BY GEORGE J. SAUCEDO1, DAVID R. BEDFORD2, GARY L. RAINES2, ROBERT J. MILLER2, and CARL M. WENTWORTH2 2000 1. California Department of Conservation Division of Mines and Geology 2. U.S. Geological Survey CALIFORNIA DEPARTMENT OF CONSERVATION DIVISION OF MINES AND GEOLOGY 801 K Street MS 14-33 Sacramento, CA 95814 LICENSE AGREEMENT (c) California Department of Conservation, Division of Mines and Geology, 2000. All rights reserved. No part of this CD-ROM may be reproduced, transmitted, or distributed in any form or by any means, electronic or mechanical, for any purpose, without the express written permission of the Division of Mines and Geology except as follows. Permission is granted to produce plots of all or part of the data under the following conditions: 1) Personal use. 2) For publication in a report, in unmodified form; cite on figure or in text as "Reproduced with permission, Division of Mines and Geology, CD-ROM 2000-007 (2000), GIS Data for the Geologic Map of California." 3) For publication in a report, in modified form; cite on figure or in text as "Modified from, Division of Mines and Geology, CD-ROM 2000-007 (2000), GIS Data for the Geologic Map of California." Introduction This digital database contains the geologic units and faults as shown on the Geologic Map of California by Charles W. Jennings published in 1977. These data were input at the same scale as the published map, 1:750,000 or 1 inch equals approximately 12 miles. The theoretical accuracy of the published map is about 0.012-inch, the width of the fault lines, which is equivalent to 232 meters (760 feet) on the ground. However, plotting and drafting errors can and do significantly increase the uncertainty. For example, a plotting error of a line width at 1:750,000 scale could cause a location error of 464 meters (approximately 1520 feet) on the ground. The user is cautioned that this database is not suitable for site-specific applications. This database should be used in conjunction with the published version of the Geologic Map of California (Geologic Data Map No. 2) and An Explanatory Text to Accompany the 1:750,000 Scale Fault and Geologic Maps of California (Bulletin 201) available from the California Department of Conservation, Division of Mines and Geology (DMG) by mail: P.O. Box 2980 Sacramento, CA 95812-2980 or by phone (916) 445-5716. These publications are also available from DMG offices in San Francisco (415) 904-7707 and Los Angeles (213) 239-0878. The database currently is available in ARC/INFO and MAPINFO formats. Future versions of the database will be released as additional information is developed. Accuracy and Limitations of this Database This database is a faithful digital representation of the geologic units, faults, and fold axes as shown on the Geologic Map of California. However, some information, such as the names of geologic features as well as locations of volcanoes and cinder cones is not shown. Users of this database should be aware of the difference between precision and accuracy. While digital data can be reproduced precisely at any scale, the accuracy of the data remains constant. As the scale is increased from 1:750,000, uncertainty and errors in contact and fault location remain the same. (See discussion of errors in the Introduction.) Also the user is cautioned that the faults in this database are not necessarily the same as those depicted on the 1:24,000-scale DMG Earthquake Fault Zone Maps. Faults in the Geologic Map and Fault Activity Map of California Databases Fault locations in the digital databases for the geologic map and the fault activity map of California are similar but not identical. The representation of faults in the digital database for the Geologic Map of California is the same as those of the Fault Map of California, published in 1975 (Jennings, 1985 p.56). Faults depicted on the Fault Activity Map of California and Adjacent Areas, published in 1994, were revised using the results of 20 years of research conducted since the earlier publication. The new map was redrafted and scribed on a new edition of the base map, which is significantly different from the previous version. Although the differences are not readily apparent on the printed versions of the maps, differences, particularly in location, will be obvious if the digital versions of the faults are superimposed. See Division of Mines and Geology Bulletin 201 (Jennings, 1985) and An Explanatory Text to Accompany the Fault Activity Map of California and Adjacent Areas (Jennings, 1994) for more information on the sources of the data. Digital Compilation This digital database represents a cooperative effort between DMG and the U.S. Geological Survey (USGS). The map was digitized in ARC/INFO from mylar copies of the original publication plates. Gary Raines of the USGS contracted for the scanning and vectorization of the plates and along with Bob Miller and Carl Wentworth (USGS) conducted initial editing of these data. During the process it was discovered that the north and south parts of the map are at slightly different scales. This inconsistency was probably inherited during the preparation of the original base map. The base map used for publication was a composite of the north and south halves of the 1:500,000 scale USGS state map series, photographically reduced to publication scale (1:750,000), and spliced together. Aside from the scale problem it was noted that there were errors in polygon and line attribution as well as omission of the structural data (fold-axes and regional strike and dip symbols) as depicted on the published geologic map. As a result of discussions between DMG and USGS staff it was decided that the best approach would be a systematic edit of the existing digital data using a raster image of the published line work as a guide. An attempt was made to minimize the spatial error in the scanned image before linking the original digital file. This edit was conducted by George Saucedo (DMG) and David Bedford (USGS). Final editing and proofing was done by George Saucedo, David Wagner, and Jennifer Davis of DMG. Base Maps The base map was prepared by scanning 1:750,000 scale, clear film reductions of the north and south halves of the 1:500,000 scale USGS state map series. Both halves were scanned as RLC images and converted into ARC/GRID format using the ARC IMAGEGRID command. Both GRIDs were georeferenced and then edited along the common boundary. The GRIDs were then combined into one image using the ARC/GRID MERGE command. For the purpose of distribution, the GRID base was converted into TIFF format using the ARC GRIDIMAGE command. The accompanying WORLD FILE was created during this conversion. Database Contents ARC/INFO The digital database consists of two ARC/INFO coverages. The coverages have been converted into ARC/INFO uncompressed export files (.e00) and must be converted by the user into ARC coverages using the import command. ARC/INFO Description of Coverages Export file ----------- ------------------------ ca-geol.e00 Contacts and faults ca-strc.e00 Fold axes and dip symbols Description of Additional Files ------------------------------- There are two additional files associated with the raster base layer (see Base_map folder): ca-base.tif California base map in TIFF format ca-base.tfw World file for California base map The following files are included for creating full-colored plots (see Plot_files folder): ca-geol.gra An ARC/INFO graphics file of the complete geologic map and explanation without base at 1:750,000 scale. ca-geol.ps A PostScript plot file of the complete geologic map and explanation with base at 1:750,000 scale. ca-geol.pdf A Portable Document Format file of the complete geologic map and explanation with base at 1:750,000 scale. ARC/INFO Database Specifics Map Projection PROJECTION -Lambert Conformal Conic DATUM -NAD 1927 UNITS -Meters on the ground SPHEROID -Clarke 1866 1st STANDARD PARALLEL 33( 2nd STANDARD PARALLEL 45( CENTRAL MERIDIAN -120( LATITUDE OF ORIGIN 0( Field Definition Terms ITEM NAME name of the database field (item) WIDTH maximum number of digits or characters stored OUTPUT output width TYPE B-binary integer, F-binary floating point numbers, I-ASCII integer, C-ASCII character string N.DEC. number of decimal places maintained for floating point numbers Contents of the Arc Attribute Tables (CA-GEOL.AAT) ITEM NAME WIDTH OUTPUT TYPE N.DEC FNODE# 4 5 B - starting node of arc (from node) TNODE# 4 5 B - ending node of arc (to node) LPOLY# 4 5 B - polygon to the left of the arc RPOLY# 4 5 B - polygon to the right of the arc LENGTH 4 12 F 3 length of arc in meters CA-GEOL# 4 5 B - unique internal control number CA-GEOL-ID 4 5 B - unique identi- fication number LTYPE 35 35 C - line type (see list below) SEL 1 1 I - user defined field used to save a selected set SYMB 3 3 I - user defined field used to save symbol assignments (such as color) Line Types Recorded in the LTYPE Field (CA-GEOL.AAT) contact, approx. located contact, certain fault, approx. located fault, approx. located, queried fault, certain fault, concealed fault, concealed, queried fault, inferred, queried map boundary, certain normal fault, approx. located normal fault, certain normal fault, concealed, queried s.s. fault, l.l., approx. located s.s. fault, l.l., certain s.s. fault, l.l., concealed s.s. fault, l.l., concealed, querie s.s. fault, r.l., approx. located s.s. fault, r.l., certain s.s. fault, r.l., concealed s.s. fault, r.l., concealed, querie scratch boundary, certain thrust fault, approx. located thrust fault, certain thrust fault, concealed water boundary, approx. located water boundary, certain Contents of the Polygon Attribute Tables (CA-GEOL.PAT) ITEM NAME WIDTH OUTPUT TYPE N.DEC AREA 4 12 F 3 area of polygon in square meters PERIMETER 4 12 F 3 length of perimeter in meters CA-GEOL# 4 5 B - unique internal control number CA-GEOL-ID 4 5 B - unique identi- fication number PTYPE 35 35 C - unit label (see list below) SEL 1 1 I - user defined field used to save a selected set SYMB 3 3 I - user defined field used to save symbol assignments (such as color) Polygon Types (Map Units - Refer to Table 1 for descriptions) Recorded in the PTYPE Field (CA-GEOL.PAT) water O Kl gr Qs Oc Kl? m Qls Oc? K mv Qrv E K? ls Qrvp E-Ep KJf Pm Q Ec KJfm C Qg Ep KJfs D Qv Tc J SO Qv? Tv J? Ca Qvp Tvp Tr Pz Qvp? Ti Mzv Pzv QPc grCz grMz grPz P grCz? grMz? pC M TK um pCc M? Ku-Ep gb grpC M+KJfs Ku gr-m grpC? Mc Ku? sch Contents of the Arc Attribute Tables (CA-STRC.AAT) ITEM NAME WIDTH OUTPUT TYPE N.DEC FNODE# 4 5 B - starting node of arc (from node) TNODE# 4 5 B - ending node of arc (to node) LPOLY# 4 5 B - polygon to the left of the arc RPOLY# 4 5 B - polygon to the right of the arc LENGTH 4 12 F 3 length of arc in meters CA-STRC# 4 5 B - unique internal control number CA-STRC-ID 4 5 B - unique identi- fication number LTYPE 35 35 C - line type (see list below) SEL 1 1 I - user defined field used to save a selected set SYMB 3 3 I - user defined field used to save symbol assignments (such as color) Line Types Recorded in the LTYPE Field (CA-STRC.AAT) f.a., anticline, certain f.a., anticline, certain dbl. plung f.a., anticline, certain e. plunge f.a., anticline, certain n. plunge f.a., anticline, certain s. plunge f.a., anticline, certain w. plunge f.a., anticline, concealed f.a., anticline, concealed dbl. plu f.a., anticline, concealed e. plung f.a., anticline, concealed n. plung f.a., anticline, concealed s. plung f.a., anticline, concealed w. plung f.a., monocline, certain f.a., syncline, certain f.a., syncline, certain dbl. plunge f.a., syncline, certain e. plunge f.a., syncline, certain n. plunge f.a., syncline, certain s. plunge f.a., syncline, certain w. plunge f.a., syncline, concealed f.a., syncline, concealed e. plunge f.a., syncline, concealed n. plunge f.a., syncline, concealed s. plunge f.a., syncline, concealed w. plunge Contents of the Point Attribute Tables (CA-STRC.PAT) ITEM NAME WIDTH OUTPUT TYPE N.DEC AREA 4 12 F 3 not used PERIMETER 4 12 F 3 not used CA-STRC# 4 5 B - unique internal control number CA-STRC-ID 4 5 B - unique identi- fication number PTTYPE 35 35 C - point type (see list below) DIP 3 3 I - dip angle in degrees (not used) STRIKE 3 3 I - strike angle in degrees SEL 1 1 I - user defined field used to save a selected set SYMB 3 3 I - user defined field used to save symbol assignments Point Types Recorded in the PTTYPE Field (CA-STRC.PAT) bedding ot bedding Database Contents MAPINFO The digital database consists of six MAPINFO.TAB files representing the geologic and structure coverages and their accompanying tic files. These data have been converted into MAPINFO files from ARC/INFO uncompressed export files (.e00) using ARCLINK software. In addition there is a thematic workspace for displaying unit colors and line attributes. MAPINFO Description of Files Files -------------- ------------------------- ca-geol_line.tab Geologic coverage - contacts and faults ca-geol_poly.tab Geologic coverage - unit polygons ca-geol_tic.tab Geologic coverage - tic locations ca-strc_line.tab Structure coverage - fold axes ca-strc_point.tab Structure coverage - strike and dip locations ca-strc_tic.tab Structure coverage - tic locations ca-geol_theme.wor Thematic workspace for displaying unit colors and line attributes There are two additional files associated with the raster base layer (see Base_map folder): ca-base.tab MAPINFO file for displaying TIFF image ca-base.tif California base map in TIFF format MAPINFO Database Specifics Map Projection PROJECTION Regional Conformal Projection Conformal Projection (California) DATUM North American 1927 (NAD 27) UNITS Meters ORIGIN (Long) -120( ORIGIN (Lat) 0( STANDARD PARALLEL (1st) 33( STANDARD PARALLEL (2nd) 45( FALSE EASTING 0 FALSE NORTHING 0 The Lambert Conformal Conic projection listed in the MAPINFO projection file (MAPINFOW.PRJ) uses -96( and 23( as the Longitude and Latitude of origin, respectively (see below). From MAPINFOW.PRJ: "--- Regional Conformal Projections ---" "Conformal Projection (United States)", 3, 62, 7, -96, 23, 33, 45, 0, 0 A text editor can be used to edit or create a new projection file using the projection parameters for these files. Example: "Conformal Projection (Geologic Map)", 3, 62, 7, -120, 0, 33, 45, 0, 0 For additional information on projections or creating your own coordinate system refer to the MapInfo Reference Manual. Field Definition Terms FIELDS names of the fields (columns) in table TYPE Character-alphanumeric character, Float-number stored in floating-point decimal form, Integer-Integer between -32,768 and +32,768 WIDTH number of characters stored in the field MAPINFO Table Structure (CA-GEOL_LINE.TAB - contacts and faults) FIELDS TYPE WIDTH FNODE_ Integer - starting node of arc (from node) TNODE_ Integer - ending node of arc (to node) LPOLY_ Integer - polygon to the left of the arc RPOLY_ Integer - polygon to the right of the arc LENGTH Float - length of arc in meters CA_GEOL_ Integer - unique internal control number CA_GEOL_ID Integer - unique identification number LTYPE Character 35 line type (see list below) SEL Decimal (1,0) user defined field used to save a selected set SYMB Decimal (3,0) user defined field used to save symbol assignments (such as color) Line Types Recorded in the LTYPE Field (CA-GEOL_LINE.TAB) (See ARC/INFO section for line types.) MAPINFO Table Structure (CA-GEOL_POLY.TAB - unit polygons) FIELDS TYPE WIDTH AREA Float - area of polygon in square meters PERIMETER Float - length of perimeter in meters CA_GEOL_ Integer - unique internal control number CA_GEOL_ID Integer - unique identification number PTYPE Character 35 unit label SEL Decimal (1,0) user defined field used to save a selected set SYMB Decimal (3,0) user defined field used to save symbol assignments (such as color) Polygon Types (Map Units) Recorded in the PTYPE Field (CA-GEOL_POLY.TAB) (See ARC/INFO section for polygon types.) MAPINFO Table Structure (CA-STRC_LINE.TAB - fold axes) FIELDS TYPE WIDTH FNODE_ Integer - starting node of arc (from node) TNODE_ Integer - ending node of arc (to node) LPOLY_ Integer - polygon to the left of the arc RPOLY_ Integer - polygon to the right of the arc LENGTH Float - length of arc in meters CA_STRC_ Integer - unique internal control number CA_STRC_ID Integer - unique identification number LTYPE Character 35 line type (see list below) SEL Decimal (1,0) user defined field used to save a selected set SYMB Decimal (3,0) user defined field used to save symbol assignments (such as color) Line Types Recorded in the LTYPE Field (See ARC/INFO section for line types.) MAPINFO Table Structure (CA-STRC_POINT.TAB - strike and dip locations) FIELDS TYPE WIDTH AREA Float - not used PERIMETER Float - not used CA_STRC_ Integer - unique internal control number CA_STRC_ID Integer - unique identification number PTTYPE Character 35 point type (see list below) DIP Decimal (3,0) dip angle in degrees (not used) STRIKE Decimal (3,0) strike angle in degrees SEL Decimal (1,0) user defined field used to save a selected set SYMB Decimal (3,0) user defined field used to save symbol assignments Point Types Recorded in the PTTYPE Field (CA-STRC_POINT.TAB) (See ARC/INFO section for point types.) MAPINFO Table Structure (CA-GEOL.TIC AND CA-STRC.TIC) FIELDS TYPE WIDTH IDTIC Integer - id number assigned to each tic XTIC Float - longitude of tic YTIC Float - latitude of tic References cited Jennings, C.W., 1977, Geologic map of California: California Department of Conservation, Division of Mines and Geology Geologic Data Map No. 2, scale 1:750,000. Jennings, C.W., 1985, An explanatory text to accompany the 1:750,000 scale fault and geologic maps of California: California Department of Conservation, Division of Mines and Geology Bulletin 201, 197 p. Jennings, C.W., 1994, Fault activity map of California and adjacent areas: California Department of Conservation, Division of Mines and Geology Geologic Data Map No. 6, scale 1:750,000. Table 1. Legend for 1:750,000 scale Geologic Map of California. CENOZOIC SEDIMENTARY ROCKS Unit on 1:750,000 map Description Qls Selected large landslide deposits Q Alluvium (mostly Holocene, some Pleistocene) Quaternary nonmarine Quaternary marine Qs Extensive sand dune deposits Qg Glacial deposits QPc Plio-Pleistocene nonmarine Pliocene nonmarine P Pliocene marine Mc Miocene nonmarine M Miocene marine Oc Oligocene nonmarine O Oligocene marine Ec Eocene nonmarine E Eocene marine Ep Paleocene marine Tc Tertiary nonmarine, undivided CENOZOIC VOLCANIC ROCKS Unit on 1:750,000 map Description Qrv Recent (Holocene) volcanic flow rocks (or predominantly flow rocks) Qrvp Recent (Holocene) pyroclastic rocks and volcanic mudflow deposits Qv Quaternary volcanic flow rocks (or predominantly flow rocks) Qvp Quaternary pyroclastic rocks and volcanic mudflow deposits Tv Tertiary volcanic flow rocks (or predominantly flow rocks) Tvp Tertiary pyroclastic rocks And volcanic mudflow deposits Ti Tertiary intrusive rocks MESOZOIC - PALEOZOIC - PRECAMBRIAN SEDIMENTARY AND METASEDIMENTARY ROCKS Unit on 1:750,000 map Description TK Tertiary-Cretaceous Coastal Belt rocks K Cretaceous marine undivided (in part nonmarine) Ku Upper Cretaceous marine Kl Lower Cretaceous marine KJf Franciscan Complex KJfm Franciscan melange KJfs Franciscan schist J Jurassic marine Tr Triassic marine Pm Permian marine C Carboniferous marine D Devonian marine SO Silurian and/or Ordovician marine C Cambrian marine Pz Paleozoic marine, undivided pC Precambrian rocks, undivided Is Limestone of probable Paleozoic or Mesozoic age sch Schist of various types and ages (either metasedimentary or metavolcanic) CENOZOIC-PRECAMBRIAN PLUTONIC, METAVOLCANIC, AND MIXED ROCKS Unit on 1:750,000 map Description grCz Cenozoic (Tertiary) granitic rocks grMz Mesozoic granitic rocks grPz Paleozoic and Permo- Triassic granitic rocks grpC Precambrian granitic rocks gr Undated granitic rocks um Ultramafic rocks, chiefly Mesozoic gb Mesozoic gabbroic rocks Mzv Mesozoic volcanic and metavolcanic rocks; Franciscan volcanic rocks mv Undivided pre-Cenozoic metavolcanic rocks Pzv Paleozoic metavolcanic rocks gr-m Granitic and metamorphic rocks, undivided, of pre-Cenozoic age M Undivided pre-Cenozoic metasedimentary and metavolcanic rocks pCc Precambrian igneous and metamorphic rock complex 15 17