GEOLOGIC MAP OF THE LAKE MATHEWS 7.5' QUADRANGLE, RIVERSIDE COUNTY, CALIFORNIA By Douglas M. Morton1 and F. Harold Weber2 Digital preparation by Van M. Diep1 and Ursula Edwards-Howells3 Prepared in cooperation with CALIFORNIA DIVISION OF MINES AND GEOLOGY Open-File Report OF 01-479 2001 This report is preliminary and has not been reviewed for conformity with U.S. Geological Survey editorial standards or with the North American Stratigraphic Code. Any use of trade, firm, or product names in this publication is for descriptive purposes only and does not imply endorsement by the U.S. Government. U.S. DEPARTMENT OF INTERIOR U.S. GEOLOGICAL SURVEY 1 U.S. Geological Survey, Department of Earth Sciences, University of California, Riverside CA 92521 2 California Division of Mines and Geology 655 South Hope Street Suite 700 Los Angeles, CA 90017 3 Department of Earth Sciences University of California Riverside, CA 92521 TABLE OF CONTENTS Introduction General How to obtain paper plots Database contents Data package Plot package Other files Software utilities How to obtain the digital files Digital databases Postscript plot files Portable Document Format (.pdf) files How to extract the geologic map database from the tar files Digital database Postscript plot files How to convert the ARC/INFO interchange (export) files Digital geologic map specifications Digital compilation Base map Spatial resolution Map accuracy standards Faults and landslides Database specifics General Lines Polygons Points References INTRODUCTION General Open-File Report 01-479 contains a digital geologic map database of the Lake Mathews 7.5' quadrangle, Riverside County, California that includes: 1. ARC/INFO (Environmental Systems Research Institute, http://www.esri.com) version 7.2.1 coverages of the various elements of the geologic map. 2. A PostScript file to plot the geologic map on a topographic base, containing a Correlation of Map Units diagram (CMU), a Description of Map Units (DMU), and an index map. 3. Portable Document Format (.pdf) files of: a. This Readme; includes in Appendix I, data contained in lkm_met.txt b. The same graphic as plotted in 2 above. Test plots have not produced 1:24,000-scale map sheets. Adobe Acrobat page size setting influences map scale. The Correlation of Map Units and Description of Map Units is in the editorial format of USGS Miscellaneous Investigations Series (I-series) maps but has not been edited to comply with I-map standards. Within the geologic map data package, map units are identified by standard geologic map criteria such as formation-name, age, and lithology. Where known, grain size is indicated on the map by a subscripted letter or letters following the unit symbols as follows: lg, large boulders; b, boulder; g, gravel; a, arenaceous; s, silt; c, clay; e.g. Qyfa is a predominantly young alluvial fan deposit that is arenaceous. Multiple letters are used for more specific identification or for mixed units, e.g., Qfysa is a silty sand.In some cases, mixed units are indicated by a compound symbol; e.g., Qyf2sc. Marine deposits are in part overlain by local, mostly alluvial fan, deposits and are labeled Qomf. Grain size follows f. Even though this is an Open-File report and includes the standard USGS Open-File disclaimer, the report closely adheres to the stratigraphic nomenclature of the U.S. Geological Survey. Descriptions of units can be obtained by viewing or plotting the .pdf file (3b above) or plotting the postscript file (2 above). This Readme file describes the digital data, such as types and general contents of files making up the database, and includes information on how to extract and plot the map and accompanying graphic file. Metadata information can be accessed at http://geo-nsdi.er.usgs.gov/metadata/open-file/01-479 and is included in Appendix I of this Readme. HOW TO OBTAIN PAPER PLOTS For those having access to large-format plotters such as HP650C, HP755C, and HP2500C, plots may be made directly from the included plot file. DATABASE CONTENTS The files constituting the geologic map database of this Open-File Report are listed below along with the interchange files from which they were extracted. Data Package All files listed below are in a compressed tar file named lkm.tar.gz (1.8 Mb); see section below titled, SOFTWARE UTILITES. ARC/INFO interchange files Lake Mathews coverages Contains lkm_geo.e00 lkm_geo Contacts, faults, geologic unit labels lkm_ano.e00 lkm_ano Annotation subclasses: GEO (for plotting unit labels) lkm_str.e00 lkm_str Attitudes and their dip values. Dip values plotted as annotation. The directory, info/, is produced in the process of importing interchange files to ARC coverages in ARC/INFO. The lkm (Lake Mathews) info/ directory contains: Feature Attribute Tables Polygon attribute table lkm_geo.pat Arc attribute table lkm_geo.aat lkm_ano.aat Point attribute table lkm_str.pat Raster file Resultant image Contains lkm.tif Lake Mathews base map Topographic base from 500 dpi scan of USGS Lake Mathews 7.5' quadrangle, 1967 Plot Package Postscript plot files of the geologic map and explanation; please see section below titled, SOFTWARE UTILITIES for additional information. Compressed file Resultant image Contains lkm_map.ps.gz lkm_map.ps PostScript plot file of geologic map and CMU/DMU The PostScript file is compressed using WinZip. The uncompressed PostScript file lkm_map.ps will plot a 1:24,000 scale, full color geologic map of the Lake Mathews quadrangle on the topographic base. A detailed CMU diagram, a DMU are included on the sheet. The sheet is in the editorial format of the U.S. Geological Survey's Miscellaneous Investigations (I) map series, and is approximately 50 X 36 inches in size. The map sheet has been successfully plotted on Hewlett-Packard large-format plotters, models HP650C, HP755C, and HP2500C. Symbols Package Files in the plot package have been prepared to produce optimum plots using the shade and marker sets and fonts listed below; these symbol sets and fonts are included in a compressed tar file named symbols.tar.gz (0.04 Mb); see section below titled SOFTWARE UTILITIES. geoSCAMP2.lin Lineset geoSCAMP2.mrk Markerset for points alc1.shd Colors geology2.shd Pattern fills fnt026 Font required for geoSCAMP2.lin fnt037 Font required for geoSCAMP2.mrk fnt035 Font required for geology2.shd Special geologic characters used in unit designations are from the Geoage font group and may be obtained at the following web site: Server: onyx.wr.usgs.gov UserID: anonymous Password: Your e-mail address Directory: pub/wpg/supplies/geoage Other files README.pdf This document lkm_map.pdf Postscript plot file of geologic map and CMU/DMU SOFTWARE UTILITIES Files which have .gz file extension were compressed using gzip. Gzip utilities are available free of charge via the Internet at the gzip home page, http://www.gzip.org. Files with a .zip file extension were compressed using WinZip, available at http://www.winzip.com. The data package is additionally bundled into a single tar (tape archive) file. The individual files must be extracted using a tar utility, available free of charge via the Internet through links on the Common Internet File Formats page, http://www.matisse.net/files/format.html. One such utility is WinZip, available at http://www.winzip.com. HOW TO OBTAIN THE DIGITAL FILES The export files, and subsequently the data and plot files, constituting the geologic map database of this Open-File Map may be obtained in two ways, both over the Internet. 1. The files can be obtained via the Web from Western Region Geologic Information Server. Go to the web page at http://geopubs.wr.usgs.gov/open-file/of01-479 and follow the directions to download the files. 2. The files can also be obtained by anonymous ftp over the Internet from wrgis.wr.usgs.gov. The files are located in the directory /pub/open-file/. Be sure to use binary transfer mode or ASCII mode for individual .e00 (ARC interchange file format) files. HOW TO EXTRACT THE GEOLOGIC MAP DATABASE FROM THE TAR FILE Digital database After downloading the files, they must be uncompressed using a gzip utility such as gzip itself or WinZip. The data files must then be extracted using a tar utility or WinZip. This process will create a directory, lkm/, that will contain the ARC/INFO interchange files and supporting files. The directory should contain the following files: lkm/ lkm_geo.e00 lkm_str.e00 lkm_ano.e00 lkm.tif The symbols.tar.gz file is imported using the same methods as for the lkm.tar.gz file. It will create a directory, symbols/ that will contain the following files: geoSCAMP2.lin geoSCAMP2.mrk alc1.shd geology2.shd fnt026 fnt037 fnt035 The following are not included in the database tar file or the symbols tar file, and are downloaded separately. lkm_map.ps.gz README.pdf lkm_map.pdf Postscript plot files Make a 14.4 MB uncompressed file, lkm_map.ps (plot of complete map), by typing gzip -d lkm_map.ps.gz (or use gzip utility of choice). Portable Document Format (.pdf) files PDF files are not stored as gzip files. They are accessed using Adobe Acrobat Reader software, available free from the Adobe website http://www.adobe.com. Follow instructions at the website to download and install the software. Acrobat Reader contains an on-line manual and tutorial. HOW TO CONVERT THE ARC/INFO INTERCHANGE (EXPORT) FILES The ARC interchange (.e00) files are converted to ARC coverages using the ARC command IMPORT. ARC interchange files can also be read by some other Geographic Information Systems, including ArcView (ESRI) and MapInfo (http://www.mapinfo.com), (Environmental Systems Research Institute, Inc., 1998). Please consult your GIS documentation to see if you can use ARC interchange files and the procedure to import them. DIGITAL GEOLOGIC MAP SPECIFICATIONS Digital compilation The geologic map information was hand digitized from a base-stable original (ink on a greenline) of the geologic map at 1:24,000 scale. Digital tics were placed by hand at latitude/longitude intersections. The lines, points, and polygons were edited using standard ARC/INFO commands, and in some places, interactively by hand using graphical user interface ALACARTE (Fitzgibbon, 1991, Fitzgibbon and Wentworth, 1991, Wentworth and Fitzgibbon, 1991). Digitization and editing artifacts significant enough to display at a scale of 1:24,000 were corrected. Base map The base map image (lkm.tif) was prepared by scanning a scale-stable clear film of the U.S. Geological Survey, 1:24,000 Lake Mathews 7.5' quadrangle (1967) topographic map. Scanning was done using an Anatech Eagle 4080 monochrome 800 dpi scanner; at a resolution of 500 dpi. The raster scan was converted to a monochromatic image in ARC/INFO, and registered and rectified to the Lake Mathews 7.5' quadrangle. No elements of the base layer are attributed. The base map is provided for reference only. Spatial resolution Use of this digital geologic map database should not violate the spatial resolution of the data. Although the digital form of the data removes the constraint imposed by the scale of a paper map, the detail and accuracy inherent in map scale are also present in the digital data. The fact that this database was edited at a scale of 1:24,000 means that higher resolution information is not generally present in the dataset. Plotting at scales larger than 1:24,000 will not yield greater real detail, although it may reveal fine-scale irregularities above the intended resolution of the database. Similarly, although higher resolution data is incorporated at a few places, the resolution of the combined output will be limited by the lower resolution data. Map accuracy standards Until uniform National geologic map standards are developed and adopted, lines and points on SCAMP (Southern California Areal Mapping Project) 1:24,000 scale geologic maps that are located to within 15 meters, relative to accurately located features on the base map, are considered to meet map accuracy standards. Dashed lines, indicated in the database as approximately located or inferred, are generally located within 30 meters, relative to accurately located features on the base map. Faults and landslides This database is sufficiently detailed to identify and characterize many actual and potential geologic hazards represented by faults and landslides, but it is not sufficiently detailed for site-specific determinations. Faults shown do not take the place of fault rupture hazard zones designated by the California State Geologist (see Hart, 1998). Database specifics General--The map database consists of ARC/INFO format coverages, which are stored in polyconic projection (Table 1), and a series of data tables. Digital tics define a 2.5-minute grid of latitude and longitude in the geologic coverages corresponding to the 2.5-minute tic grid on the topographic base map. Table 1 --- Map Projection Projection Polyconic Datum NAD27 Zunits No Units Meters Spheroid Clark 1866 X shift 0.000000000 Y shift 0.000000000 Parameters -117 26 15.000 longitude of central meridian 33 45 0.00 latitude of projections origin 0.00000 false easting (meters) 0.00000 false northing (meters) The content of the geologic database can be described in terms of feature classes that include lines, points, and areas that compose the map. See the metadata text file (Appendix I) for detailed descriptions. Lines - Lines are recorded as strings of arcs and are described in an arc attribute (.aat) table. Complete lists of the line types (LTYPE) used in the quadrangle are available in Appendix I. They represent contacts and faults, which define the boundaries of map units and map boundaries. Polygons --- Geologic map units (polygons) are described in the polygon attribute (.pat) table (details in Appendix I). For traditional descriptions of the map units, see the Portable Document Format file lkm_map.pdf or the Postscript map plot, lkm_map.ps. A list of all map units in the database is given in Appendix I. Points - Point information (attitudes of planar and linear features) is recorded as coordinate and related information. Complete lists of the point types (PTTYPE) used in the point coverage are available in Appendix I. REFERENCES Environmental Systems Research Institute, Inc, 1991, ARC/INFO command references 6.0: Proprietary software manual Fitzgibbon, T.T., 1991, ALACARTE installation and system manual (version 1.0): U.S. Geological Survey, Open-File Report 91-587B Fitzgibbon, T.T., and Wentworth, C.M., 1991, ALACARTE user interface - AML code and demonstration Maps (version 1.0): U.S. Geological Survey, Open-File Report 91-587A Wentworth, C.M., and Fitzgibbon, T.T., 1991, ALACARTE user manual (version 1.0): U.S. Geological Survey Open-File Report 91-587C Appendix I (Original metadata text) Identification_Information: Citation: Citation_Information: Originator: Douglas M. Morton Originator: F. Harold Weber, Jr. Publication_Date: 2001 Title: Geologic Map of the Lake Mathews 7.5' Quadrangle, Riverside County, California Edition: Version 1.0 Geospatial_Data_Presentation_Form: vector digital data Series_Information: Series_Name: U.S. Geological Survey Open-File Report Issue_Identification: USGS OF 01-479 Publication_Information: Publication_Place: Menlo Park, California Publisher: U.S. Geological Survey Online_Linkage: http://geopubs.wr.usgs.gov/open-file/of01-479 Description: Abstract: This data set maps and describes the geology of the Lake Mathews 7.5' quadrangle, Riverside County, California. Created using Environmental Systems Research Institute's ARC/INFO software, the data base consists of the following items: (1) a map coverage containing geologic contacts and units, (2) a coverage containing structural data, (3) a coverage containing geologic unit annotation and leaders, and (4) attribute tables for geologic units (polygons), contacts (arcs), and site-specific data (points). In addition, the data set includes the following graphic and text products: (1) a postscript graphic plot-file containing the geologic map, topography, cultural data, a Correlation of Map Units (CMU) diagram, a Description of Map Units (DMU), and a key for point and line symbols, and (2) PDF files of the Readme (including the metadata file as an appendix), and the graphic produced by the Postscript plot file. All but the southeast corner of the Lake Mathews quadrangle is in the Perris block, a relatively stable, rectangular-in-plan area located between the Elsinore and San Jacinto fault zones in the northern Peninsular Ranges Province. In the southwest corner of the quadrangle, a small triangular-shaped area that is part of the Santa Ana Mountains structural block is separated from the Perris block by a short segment of the Elsinore fault zone. The active Elsinore fault zone, a major component of the San Andreas fault system, consists of a series of en echelon northwest-striking right lateral faults located in a graben-like structure. There is limited relief within the quadrangle because of the presence of two prominent erosion surfaces. The lower Perris surface (about 1,500 feet elevation) has low relief and dominates the physiography of the northern half of the quadrangle. This surface is discontinuously covered by coarse-grained, clastic, non-marine sedimentary rocks of the middle Miocene-age Lake Mathews Formation. A higher Gavilan-Lakeview surface (about 2,100 feet elevation) occurs in the eastern part of the quadrangle, and is locally covered by small exposures of fluvial conglomerate that contain exotic clasts of red rhyolite. The Lake Mathews quadrangle is underlain almost entirely by Cretaceous and older basement rocks. Two different types of metamorphic rocks are exposed in the quadrangle. In the northeast is a northwest trending exposure of amphibolite grade biotite-bearing schist of probable Mesozoic age. This schist separates massive textured granitic rocks to the west from foliated and layered granitic rocks to the east. The large expanse of metamorphic rock between Temescal Wash and Lake Mathews is low metamorphic grade, typically siliceous, but highly variable in composition. Cretaceous plutonic rocks in the quadrangle are part of the composite Peninsular Ranges batholith, and represent a wide variety of mafic to intermediate composition granitic rocks. Most are massive-textured with the exception of the crudely foliated biotite-hornblende tonalite of the Val Verde pluton in the northeast corner of the quadrangle. The Cajalco pluton, which consists of biotite monzogranite, granodiorite and lesser amounts of biotite-hornblende granodiorite, by far, accounts for most of the granitic rocks in the quadrangle. It is a shallow level pluton emplaced by magmatic stoping into largely intermediate composition volcanic and volcanoclastic rocks and metamorphic rocks in its western and southern extent and into gabbroic rocks in its northern extent. The pluton appears to be tilted up to the northeast with the texture of the rock changing from subporphyritic rock containing beta-quartz-appearing phenocrysts in the southwestern part of the pluton to coarser-grained hypautomorphic texture rock in the eastern part. Located in the upper part of the pluton and in overlying wall rock in the shallow western part of the pluton is widespread metasomatic tourmaline rock. Locally parts of the pluton have been completely replaced by tourmaline but more commonly tourmaline occurs in discrete thin zones, generally along joints. Some of the larger masses of tourmaline rock, locally termed tourmaline 'blowouts', contain cassiterite and sulfides. One large mass of cassiterite-bearing tourmaline rock supported a tin mining and smelting operation. In the southeast corner of the quadrangle is the northwest part of the Gavilan ring complex. This shallow plutonic complex centered southeast of the quadrangle is predominantly tonalitic composition, characterized by the presence of hypersthene, which is rarely found in Peninsular Ranges batholithic rocks of intermediate composition. Most of the southern part of the quadrangle is underlain by siliceous volcanic and volcanoclastic rocks considered to be coeval with the batholith and which are considered to represent the supra-part of the batholithic magmatism. These rocks generally range in composition from rhyolite to andesite, but latite is probably the predominant composition. Paleocene continental rocks of the Silverado Formation occur within the Elsinore fault zone and nearby on the adjacent Perris block. Clay-rich parts of the Silverado Formation have been mined for industrial clay. Near Arlington Mountain, in the northwest part of the quadrangle, are two very small occurrences of conglomerate that consist of exotic welded-tuff clasts and a few exotic bedded quartzite clasts. Extensive Quaternary alluvial deposits are found along the south side of Lake Mathews and in the Temescal Valley along the Elsinore fault zone. Purpose: The data set for the Lake Mathews 7.5' quadrangle was prepared under the U.S. Geological Survey Southern California Areal Mapping Project (SCAMP) as part of an ongoing effort to develop a regional geologic framework of southern California, and to utilize a Geographic Information System (GIS) format to create regional digital geologic databases. These regional databases are being developed as contributions to the National Geologic Map Database of the National Cooperative Geologic Mapping Program of the USGS. Supplemental_Information: none Time_Period_of_Content: Time_Period_Information: Single_Date/Time: Calendar_Date: 2001 Currentness_Reference: New data Status: Progress: Complete Maintenance_and_Update_Frequency: As Needed Spatial_Domain: Bounding_Coordinates: West_Bounding_Coordinate: -117.5000909 East_Bounding_Coordinate: -117.37490912 North_Bounding_Coordinate: 33.87500019 South_Bounding_Coordinate: 33.74997833 Keywords: Theme: Theme_Keyword_Thesaurus: none Theme_Keyword: geologic map Theme_Keyword: geology Theme_Keyword: bedrock geology Theme_Keyword: alluvial geology Place: Place_Keyword_Thesaurus: none Place_Keyword: California Place_Keyword: Riverside County Place_Keyword: Lake Mathews 7.5' quadrangle Stratum: Stratum_Keyword_Thesaurus: none Stratum_Keyword: Cretaceous tonalite and granodiorite Stratum_Keyword: Quaternary deposits Temporal: Temporal_Keyword_Thesaurus: none Temporal_Keyword: Cretaceous Temporal_Keyword: Quaternary Access_Constraints: none Use_Constraints: The Lake Mathews 7.5' geologic-map database should be used to evaluate and understand the geologic character of the Lake Mathews 7.5' quadrangle as a whole. The data should not be used for purposes of site-specific land-use planning or site-specific geologic evaluations. The database is sufficiently detailed to identify and characterize many actual and potential geologic hazards represented by faults and landslides and posed by ground subsidence and earthquake-generated ground shaking. However, it is not sufficiently detailed for site-specific determinations or evaluations of these features. Faults shown do not take the place of fault-rupture hazard zones designated by the California State Geologist (see Hart, 1988). Use of this digital geologic-map database should not violate the spatial resolution of the data. Although the digital form of the data removes the constraint imposed by the scale of a paper map, the detail and accuracy inherent in map scale are also present in the digital data. The fact that this database was compiled and edited at a scale of 1:24,000 means that higher resolution information may not have been uniformly retained in the dataset. Plotting at scales larger than 1:24,000 will not yield greater real detail, although it may reveal fine-scale irregularities below the intended resolution of the database. Similarly, although higher resolution data is incorporated in most of the map, the resolution of the combined output will be limited by the lower resolution data. Point_of_Contact: Contact_Information: Contact_Person_Primary: Contact_Person: Douglas M. Morton Contact_Organization: U.S. Geological Survey, Western Region, Earth Surface Processes Team Contact_Position: Project geologist Contact_Address: Address_Type: mailing address Address: U.S. Geological Survey Address: Department of Earth Sciences Address: University of California, Riverside City: Riverside State_or_Province: California Postal_Code: 92521 Country: United States of America Contact_Voice_Telephone: (909) 276-6397 Contact_Facsimile_Telephone: (909) 276-6295 Contact_Electronic_Mail_Address: scamp@usgs.gov Data_Set_Credit: Geologic mapping and digital preparation of this report were sponsored jointly by (1) the National Cooperative Geologic Mapping Program of the U.S. Geological Survey, (2) the California Division of Mines and Geology, and (3) the Southern California Areal Mapping Project (SCAMP). Native_Data_Set_Environment: SunOS, 5.8, sun4m UNIX ARC/INFO version 7.2.1 Cross_Reference: Citation_Information: Originator: Morton, D.M. Publication_Date: 1999 Title: Preliminary digital geologic map of the Santa Ana 30'x60' quadrangle, southern California, version 1.0. Geospatial_Data_Presentation_Form: vector digital data Series_Information: Series_Name: U.S. Geological Survey Open-File Report Issue_Identification: USGS OF 99-172 Publication_Information: Publication_Place: California Publisher: U.S. Geological Survey Online_Linkage: http://geopubs.wr.usgs.gov/open-file/of99-172 Data_Quality_Information: Attribute_Accuracy: Attribute_Accuracy_Report: Geologic-map units in the Lake Mathews quadrangle database were described using standard field methods. Consistent with these methods, the database author has assigned standard geologic attributes to geologic lines, points, and polygons identified in the database. Nation-wide geologic-map accuracy standards have not been developed and adopted by the U.S. Geological Survey and other earth-science entities. Until such standards are adopted, the SCAMP project has developed internal map-accuracy standards for 1:24,000-scale geologic maps produced by the project. Geologic lines and points on 1:24,000 scale geologic maps are judged to meet SCAMP's internal map-accuracy standards if they are located to within +/-15 meters, relative to topographic or cultural features on the base map. On any derivative geologic-map plot, line data that are judged to meet the SCAMP internal map-accuracy standard are denoted by solid lines; line data that may not meet the SCAMP internal map-accuracy standard are denoted by dashed or dotted lines. There is no cartographic device for denoting the map-accuracy for geologic-point data (e.g., symbols representing bedding, foliation, lineation, etc.). Logical_Consistency_Report: Polygon and chain-node topology present. The areal extent of the map is represented digitally by an appropriately projected (polyconic projection), mathematically generated box. Consequently, polygons intersecting the lines that comprise the map boundary are closed by that boundary. Polygons internal to the map boundary are completely enclosed by line segments which are themselves a set of sequentially numbered coordinate pairs. Point data are represented by coordinate pairs. Completeness_Report: The geologic map database of the Lake Mathews 7.5' quadrangle contains new data that have been subjected to rigorous review and are a substantially complete representation of the current state of knowledge concerning the geology of the quadrangle. Positional_Accuracy: Horizontal_Positional_Accuracy: Horizontal_Positional_Accuracy_Report: The maximum transformation RMS error acceptable for a 7.5' quadrangle transformation and data input is 0.003 (1.8 meters). Horizontal positional accuracy was checked by visual comparison of hard-copy plots with base-stable source data. Lineage: Process_Step: Process_Description: Field mapping and aerial photograph interpretation; iterative process (D.M. Morton). Process_Date: 1993-95 Process_Step: Process_Description: Field mapping (F.H. Weber, Jr.). Process_Date: 1976 Process_Step: Process_Description: Digitization of geologic linework and point data from a scale-stable cartographic base of quadrangle. ARC/INFO database established; cleanup of artifacts; polygon, arc, and point attribute tables established. Digitizing and editing artifacts significant enough to display at a scale of 1:24,000 were corrected (V.M. Diep and U. Edwards-Howells). Process_Date: 1999-2001 Process_Step: Process_Description: Description of map units and correlation of map units (F.K. Miller). Process_Date: 2001 Process_Step: Process_Description: Revision of description of map units and correlation of map units (Kelly Corriea). Process_Date: 2001 Process_Step: Process_Description: First draft of metadata created by Michael J. Watson using FGDCMETA.AML ver. 1.2 05/14/98 on ARC/INFO data set /scamp26/mwatson/lkm_ofr/lkm_geo Process_Date: 20011207 Spatial_Data_Organization_Information: Direct_Spatial_Reference_Method: Vector Point_and_Vector_Object_Information: SDTS_Terms_Description: SDTS_Point_and_Vector_Object_Type: Point Point_and_Vector_Object_Count: 281 SDTS_Point_and_Vector_Object_Type: String Point_and_Vector_Object_Count: 703 SDTS_Point_and_Vector_Object_Type: GT-polygon composed of chains Point_and_Vector_Object_Count: 282 Spatial_Reference_Information: Horizontal_Coordinate_System_Definition: Planar: Map_Projection: Map_Projection_Name: Polyconic Polyconic: Latitude_of_True_Scale: 33.75 Longitude_of_Central_Meridian: -117.4375 False_Easting: 0.00000 False_Northing: 0.00000 Planar_Coordinate_Information: Planar_Coordinate_Encoding_Method: coordinate pair Coordinate_Representation: Abscissa_Resolution: 1.000373721122 Ordinate_Resolution: 1.000373721122 Planar_Distance_Units: Meters Geodetic_Model: Horizontal_Datum_Name: North American Datum of 1927 Ellipsoid_Name: Clarke 1866 Semi-major_Axis: 6378206.4 Denominator_of_Flattening_Ratio: 294.98 Entity_and_Attribute_Information: Overview_Description: Entity_and_Attribute_Overview: Version 1.0 of the Lake Mathews 7.5' quadrangle comprises three ARC/INFO coverages, of which two contain geologic data, and one contains cartographic features: lkm_geo (geology), lkm_str (structural data), and lkm_ano (annotation and leaders). Geologic data represented by line entities and the polygons they delineate are contained in the coverage LKM_GEO. For display purposes, the annotation coverage contains one annotation subclass: anno.geo contains unit labels. Geological point data includes site-specific information describing the types and the orientation of bedding, foliation, and lineations. Annotation is respective dip and plunge values associated with individual point data. > >LKM_GEO.PAT: > >COLUMN ITEM NAME WIDTH OUTPUT TYPE N.DEC ALTERNATE NAME > 1 AREA 8 18 F 5 > 9 PERIMETER 8 18 F 5 > 17 LKM_GEO# 4 5 B - > 21 LKM_GEO-ID 4 5 B - > 25 LABL 35 35 C - > 60 PLABL 35 35 C - > 95 SHD 3 3 I - > 98 SHDFIL 3 3 I - > 101 NAME 200 200 C - > > >LKM_GEO.AAT: > >COLUMN ITEM NAME WIDTH OUTPUT TYPE N.DEC ALTERNATE NAME > 1 FNODE# 4 5 B - > 5 TNODE# 4 5 B - > 9 LPOLY# 4 5 B - > 13 RPOLY# 4 5 B - > 17 LENGTH 8 18 F 5 > 25 LKM_GEO# 4 5 B - > 29 LKM_GEO-ID 4 5 B - > 33 LTYPE 60 60 C - > 93 L-SYMB 3 3 I - > > Entity_and_Attribute_Detail_Citation: none Detailed_Description: Entity_Type: Entity_Type_Label: lkm_geo.pat Entity_Type_Definition: Geologic units (LABL) and their corresponding names (NAME) identified in the Lake Mathews 7.5' quadrangle Attribute: Attribute_Label: LABL Attribute_Definition: geologic map unit label, in plain text Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: Kcg Enumerated_Domain_Value_Definition: Monzogranite of Cajalco pluton Enumerated_Domain: Enumerated_Domain_Value: Kcgb Enumerated_Domain_Value_Definition: Granodiorite and gabbro, undifferentiated of Cajalco pluton Enumerated_Domain: Enumerated_Domain_Value: Kcgd Enumerated_Domain_Value_Definition: Granodiorite of Cajalco pluton Enumerated_Domain: Enumerated_Domain_Value: Kcgq Enumerated_Domain_Value_Definition: Granodiorite and quartz latite, undifferentiated of Cajalco pluton Enumerated_Domain: Enumerated_Domain_Value: Kct Enumerated_Domain_Value_Definition: Tonalite of Cajalco pluton Enumerated_Domain: Enumerated_Domain_Value: Kcto Enumerated_Domain_Value_Definition: Tourmalinized monzogranite and granodiorite Enumerated_Domain: Enumerated_Domain_Value: Kgb Enumerated_Domain_Value_Definition: Gabbro Enumerated_Domain: Enumerated_Domain_Value: Kgt Enumerated_Domain_Value_Definition: Massive textured tonalite of Gavilan ring complex Enumerated_Domain: Enumerated_Domain_Value: Kgtf Enumerated_Domain_Value_Definition: Foliated tonalite of Gavilan ring complex Enumerated_Domain: Enumerated_Domain_Value: Kgu Enumerated_Domain_Value_Definition: Granite, undifferentiated Enumerated_Domain: Enumerated_Domain_Value: Khg Enumerated_Domain_Value_Definition: Heterogeneous granitic rocks Enumerated_Domain: Enumerated_Domain_Value: Kt Enumerated_Domain_Value_Definition: Tonalite, undifferentiated Enumerated_Domain: Enumerated_Domain_Value: Kvem Enumerated_Domain_Value_Definition: Estelle Mountain volcanics of Herzig (1991) Enumerated_Domain: Enumerated_Domain_Value: Kvr Enumerated_Domain_Value_Definition: Rhyolite of Estelle Mountain volcanics of Herzig (1991) Enumerated_Domain: Enumerated_Domain_Value: Kvs Enumerated_Domain_Value_Definition: Intermixed Estelle Mountain volcanics of Herzig (1991) and sedimentary rocks Enumerated_Domain: Enumerated_Domain_Value: Kvspi Enumerated_Domain_Value_Definition: Intrusive rocks associated with Santiago Peak Volcanics Enumerated_Domain: Enumerated_Domain_Value: Kvt Enumerated_Domain_Value_Definition: Tonalite of Val Verde pluton Enumerated_Domain: Enumerated_Domain_Value: Lake Mathews Enumerated_Domain_Value_Definition: Lake Mathews Enumerated_Domain: Enumerated_Domain_Value: Mzs Enumerated_Domain_Value_Definition: Schist Enumerated_Domain: Enumerated_Domain_Value: Mzu Enumerated_Domain_Value_Definition: Mesozoic metasedimentary rocks, undifferentiated Enumerated_Domain: Enumerated_Domain_Value: QTt Enumerated_Domain_Value_Definition: Conglomerate of Temescal Wash Enumerated_Domain: Enumerated_Domain_Value: Qaf Enumerated_Domain_Value_Definition: Artificial fill Enumerated_Domain: Enumerated_Domain_Value: Qoa Enumerated_Domain_Value_Definition: Old axial channel deposits Enumerated_Domain: Enumerated_Domain_Value: Qoaa Enumerated_Domain_Value_Definition: Old axial channel deposits, arenaceous Enumerated_Domain: Enumerated_Domain_Value: Qoag Enumerated_Domain_Value_Definition: Old axial channel deposits, gravel Enumerated_Domain: Enumerated_Domain_Value: Qof Enumerated_Domain_Value_Definition: Old alluvial fan deposits Enumerated_Domain: Enumerated_Domain_Value: Qofa Enumerated_Domain_Value_Definition: Old alluvial fan deposits, arenaceous Enumerated_Domain: Enumerated_Domain_Value: Qofg Enumerated_Domain_Value_Definition: Old alluvial fan deposits, gravel Enumerated_Domain: Enumerated_Domain_Value: Qova Enumerated_Domain_Value_Definition: Old alluvial valley deposits, arenaceous Enumerated_Domain: Enumerated_Domain_Value: Qvoa Enumerated_Domain_Value_Definition: Very old axial channel deposits Enumerated_Domain: Enumerated_Domain_Value: Qvoag Enumerated_Domain_Value_Definition: Very old axial channel deposits, gravel Enumerated_Domain: Enumerated_Domain_Value: Qvof1g Enumerated_Domain_Value_Definition: Very old alluvial fan deposits, unit 1, gravel Enumerated_Domain: Enumerated_Domain_Value: Qvofa Enumerated_Domain_Value_Definition: Very old alluvial fan deposits, arenaceous Enumerated_Domain: Enumerated_Domain_Value: Qvofg Enumerated_Domain_Value_Definition: Very old alluvial fan deposits, gravel Enumerated_Domain: Enumerated_Domain_Value: Qyaa Enumerated_Domain_Value_Definition: Young axial channel deposits, arenaceous Enumerated_Domain: Enumerated_Domain_Value: Qyag Enumerated_Domain_Value_Definition: Young axial channel deposits, gravel Enumerated_Domain: Enumerated_Domain_Value: Qyf Enumerated_Domain_Value_Definition: Young alluvial fan deposits Enumerated_Domain: Enumerated_Domain_Value: Qyfa Enumerated_Domain_Value_Definition: Young alluvial fan deposits, arenaceous Enumerated_Domain: Enumerated_Domain_Value: Qyfg Enumerated_Domain_Value_Definition: Young alluvial fan deposits, gravel Enumerated_Domain: Enumerated_Domain_Value: Qyva Enumerated_Domain_Value_Definition: Young alluvial valley deposits, arenaceous Enumerated_Domain: Enumerated_Domain_Value: Tcga Enumerated_Domain_Value_Definition: Conglomerate of Arlington Mountain Enumerated_Domain: Enumerated_Domain_Value: Tcgr Enumerated_Domain_Value_Definition: Rhyolite-clast conglomerate of Lake Mathews area Enumerated_Domain: Enumerated_Domain_Value: Tlm Enumerated_Domain_Value_Definition: Lake Mathews Formation Enumerated_Domain: Enumerated_Domain_Value: Tlm? Enumerated_Domain_Value_Definition: Lake Mathews Formation Enumerated_Domain: Enumerated_Domain_Value: Tsi Enumerated_Domain_Value_Definition: Silverado Formation Attribute: Attribute_Label: PLABL Attribute_Definition: Geological map unit label used to generate plot labels with relevant stratigraphic symbols. The geologic units with LABL designating Mesozoic (Mz) have a keystroke substitute character, }, that calls their corresponding symbols from the Geoage Font Group. Geologic map unit labels will plot on derivative map plots with appropriate stratigraphic symbols if PLABL is used as the source for unit labels. Attribute: Attribute_Label: SHD Attribute_Definition: polygon color (as integer value) from shadeset alc1.shd Attribute: Attribute_Label: SHDFIL Attribute_Definition: polygon fill pattern (as integer value) from shadeset geology2.shd Attribute: Attribute_Label: NAME Attribute_Definition: Geologic name of map unit (see list under LABL attribute) Detailed_Description: Entity_Type: Entity_Type_Label: lkm_geo.aat Entity_Type_Definition: Geologic features such as contacts and faults that bound rock-unit polygons Attribute: Attribute_Label: LTYPE Attribute_Definition: Description of types of lines on the geologic map (contact, fault). Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: Kcto, zone of tourmalinized monzogranite and granodiorite Enumerated_Domain_Value: contact, certain Enumerated_Domain_Value: fault, approx. located Enumerated_Domain_Value: fault, certain Enumerated_Domain_Value: fault, concealed Enumerated_Domain_Value: map boundary Attribute: Attribute_Label: L-SYMB Attribute_Definition: stores appropriate line symbol value from the lineset geoscamp2.lin Detailed_Description: Entity_Type: Entity_Type_Label: lkm_str.pat Entity_Type_Definition: Geological point data includes site-specific information describing the types and the orientation of bedding, foliation, and lineations. One annotation subclass is included in the geologic points coverage, LKM_STR which displays the respective dip and plunge values associated with individual point data. Attribute: Attribute_Label: PTTYPE Attribute_Definition: describes type of point data (bedding, horizontal bedding, foliation) Attribute: Attribute_Label: P-SYMB Attribute_Definition: Coded integer value that relates point to cartographic point symbol in markerset geoscamp2.mrk Attribute: Attribute_Label: STRIKE Attribute_Definition: Azimuthal strike of planar feature Attribute: Attribute_Label: DIP Attribute_Definition: Dip of planar feature Detailed_Description: Entity_Type: Entity_Type_Label: lkm_ano.aat Entity_Type_Definition: Annotation leaders Attribute: Attribute_Label: L-SYMB Attribute_Definition: Coded integer value (1) that relates arcs to cartographic line symbol in lineset geoscamp2.lin Distribution_Information: Distributor: Contact_Information: Contact_Organization_Primary: Contact_Organization: U.S. Geological Survey Information Services Contact_Address: Address_Type: mailing address Address: Box 25286 Denver Federal Center City: Denver State_or_Province: Colorado Postal_Code: 80225 Country: USA Contact_Voice_Telephone: (303)202-4700 Contact_Facsimile_Telephone: (303)202-4693 Distribution_Liability: The U.S. Geological Survey (USGS) provides these geographic data "as is." The USGS makes no guarantee or warranty concerning the accuracy of information contained in the geographic data. The USGS further makes no warranties, either expressed or implied as to any other matter whatsoever, including, without limitation, the condition of the product, or its fitness for use lies entirely with the user. Although these data have been processed successfully on computers at the USGS, no warranty, expressed or implied, is made by the USGS regarding the use of these data on any other system, nor does the fact of distribution constitute or imply any such warranty. In no event shall the USGS have any liability whatsoever for payment of any consequential, incidental, indirect, special, or tort damages of any kind, including, but not limited to, any loss of profits arising out of use of or reliance on the geographic data or arising out of the delivery, installation, operation, or support by USGS. This digital geologic map database of the Lake Mathews 7.5' quadrangle, 1:24,000 map-scale, and any derivative maps thereof, is not meant to be used or displayed at any scale larger than 1:24,000 (e.g., 1:12,000). Metadata_Reference_Information: Metadata_Date: 20011207 Metadata_Review_Date: 20011210 Metadata_Contact: Contact_Information: Contact_Organization_Primary: Contact_Organization: U.S. Geological Survey Contact_Person: Rachel M.H. Alvarez Contact_Position: Geologist Contact_Address: Address_Type: mailing address Address: U.S. Geological Survey Address: Department of Earth Sciences Address: University of California, Riverside City: Riverside State_or_Province: California Postal_Code: 92521 Country: USA Contact_Voice_Telephone: (909) 276-6397 Contact_Facsimile_Telephone: (909) 276-6295 Contact_Electronic_Mail_Address: rhauser@usgs.gov Metadata_Standard_Name: FGDC Content Standards for Digital Geospatial Metadata Metadata_Standard_Version: Version of June 8, 1994 Metadata_Access_Constraints: none Metadata_Use_Constraints: none