Entry_ID: (required) Entry_Title: Geologic map of the Lakeview 7.5' quadrangle, Riverside County, California Group: Data_Set_Citation Originator(s): D.M. Morton; J.C. Matti Title: Geologic map of the Lakeview 7.5' quadrangle, Riverside County, California Publication: U.S. Geological Survey Open-File Report Publication_Date: 2001 Publication_Place: Menlo Park, California Publisher: U.S. Geological Survey Edition: Version 1.0 Data_Presentation_Form: vector digital data URL: http://geopubs.wr.usgs.gov/open-file/of01-174/ End_Group Keyword: geologic map Keyword: geology Keyword: bedrock geology Keyword: Active fault Keyword: San Jacinto Fault Keyword: surficial geology Keyword: Peninsular Ranges batholith Keyword: Granitic rocks Keyword: Tonalite Group: Temporal_Coverage Start_date: 19620401 Stop_date: 20000201 End_Group Data_Set_Progress: Complete Group: Spatial_Coverage Southernmost_Latitude: 33.74998308 Northernmost_Latitude: 33.87499933 Westernmost_Longitude: -117.12509085 Easternmost_Longitude: -116.99990904 End_Group Location: California Location: Riverside County Location: Lakeview 7.5' quadrangle Location: Peninsular Ranges Group: Data_Resolution Latitude_Resolution: 0.000001 Longitude_Resolution: 0.000001 End_Group Access_Constraints: None Use_Constraints: The Lakeview 7.5' geologic-map database should be used to evaluate and understand the geologic character of the Lakeview 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 geologic materials and structures. However, it is not sufficiently detailed for site-specific determinations. 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 parts of the map, the resolution of the combined output will be limited by the lower resolution data. Originating_Center: (required) Group: Data_Center Data_Center_Name: U.S. Geological Survey Information Services Dataset_ID: US Geological Survey Open-File Report 01-XXX Group: Data_Center_Contact Last_name: U.S. Geological Survey Information Services First_name: N/A Phone: 1-888-ASK-USGS Phone: 303-202-4700 Group: Address Box 25286, Denver Federal Center Denver, Colorado 80255-0046 USA End_Group End_Group End_Group Storage_Medium: SunOS, 5.6, sun4u UNIX ARC/INFO version 7.2.1 Group: Multimedia_Sample URL: http://geopubs.wr.usgs.gov/open-file/of01-174/images/lkvw.gif Format: GIF Group: Description Simple image of the geologic map, topographic base, Correlation of Map Units, a description of Map Units and key to point and line symbols End_Group End_Group Group: Multimedia_Sample URL: http://geopubs.wr.usgs.gov/open-file/of01-174/lkvw_map.pdf Format: PDF Group: Description Navigable portable document file (.pdf) image of the geologic map, topographic base, Correlation of Map Units, Description of Map Units and key to point and line symbols. End_Group End_Group Group: Reference Citation_Information: Originator: D.M. Morton Publication_Date: 1972 Title: Geology of the Lakeview-Perris quadrangles, Riverside County, California Geospatial_Data_Presentation_Form: paper map Series_Information: Series_Name: California Division of Mines and Geology Map Issue_Identification: Map Sheet 19 Publication_Information: Publication_Place: Sacramento, California Publisher: California Division of Mines and Geology End_Group Group: Summary The data set for the Lakeview quadrangle has been prepared by the Southern California Areal Mapping Project (SCAMP), a cooperative project sponsored jointly by the U.S. Geological Survey and the California Division of Mines and Geology. The Lakeview data set represents part of an ongoing effort to create a regional GIS geologic database for southern California. This regional digital database, in turn, is being developed as a contribution to the National Geologic Map Database of the National Cooperative Geologic Mapping Program of the USGS. The digital geologic map database for the Lakeview 7.5' quadrangle has been created as a general-purpose data set that is applicable to other land-related investigations in the earth and biological sciences. For example, it can be used for groundwater studies in the San Bernardino basin, and for mineral resource evaluation studies, animal and plant habitat studies, and soil studies in the San Bernardino National Forest. The database is not suitable for site-specific geologic evaluations. This data set maps and describes the geology of the Lakeview 7.5' quadrangle, Riverside County, California. The quadrangle encompasses part of the northern Peninsular Ranges Province. Tonalitic granitic rocks of the Cretaceous Peninsular Range batholith dominate the bedrock areas, and include rocks ranging in composition from monzogranite to gabbro. The Lakeview Mountains are underlain chiefly by tonalite of the Lakeview pluton and related rocks. In the northeastern corner of the quadrangle, Tertiary sedimentary rocks of the San Timoteo beds of Frick (1921) and Mount Eden Formation of Fraser (1931) rest on Paleozoic schist, quartzite, gneiss, and marble having a well developed east dipping foliation. The Tertiary formations are much more extensively exposed in the San Timoteo Badlands to the northeast and southeast. These Tertiary and Paleozoic units are separated from the Lakeview Mountains by the San Jacinto Valley, which locally contains up to 3,000 m of Quaternary sediments. Two strands of the seismically active San Jacinto Fault zone bound the Valley, the Claremont Fault on the northeast side, and the Casa Loma Fault on the southwest side. Numerous cracks and fissures related to both groundwater withdrawal and tectonic movements are developed in the Quaternary sediments, especially in the northern part of the quadrangle. Created using Environmental Systems Research Institute's ARC/INFO software, the database consists of the following items: (1) a map coverage containing faults, geologic contacts and units, (2) a coverage showing structural data, (3) a coverage containing geologic unit annotation and leaders, and (4) five additional INFO data tables (.rel) that contain detailed, coded, geologic information such as texture, fabric, color, and mineralogy and (5) line and point dictionaries, lines.rel and points.rel. These additional data are accessible to the user through the utilization of ARC/INFO relate environments and provide the user access to as much or as little of the encoded data as required. 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 this Readme (including the metadata file as an appendix), the poly_attrib_code.txt (the polygon attribute coding), and the graphic produced by the Postscript plot file. The geologic map database contains original U.S. Geological Survey data generated by detailed field observation and by interpretation of aerial photographs. Within the database, geologic contacts are represented as lines (arcs), geologic units as polygons, and site-specific data as points. Polygon, arc, and point attribute tables (.pat, .aat, and .pat, respectively) uniquely identify each geologic datum. Within the geologic map database, map units are identified by standard geologic map criteria such as formation-name, age, and lithology. The authors have attempted to adhere to the stratigraphic nomenclature of the U.S. Geological Survey and the North American Stratigraphic Code, but the database has not received a formal editorial review of geologic names. Geologic map unit labels entered in database items LABL and PLABL contain substitute characters for conventional stratigraphic age symbols: Paleozoic appears as 'Pz' in LABL and as '|' in PLABL. The substitute characters in PLABL invoke their corresponding symbols from the GeoAge font group to generate map unit labels with conventional stratigraphic symbols. End_Group Group: DIF_Author Last_name: Cossette First_name: Pamela Middle_name: M. Email: pcossette@usgs.gov Phone: (509) 368-3123 Group: Address 904 West Riverside Avenue, Rm. 202 Spokane, WA 99201-1087 USA End_Group End_Group DIF_Revision_Date: 20010711 Science_Review_Date: