Entry_ID: (required) Entry_Title: Geologic Map of the Cucamonga Peak 7.5' quadrangle, San Bernardino County, California Group: Data_Set_Citation Originator(s): Douglas M. Morton; Jonathan C. Matti Title: Geologic Map of the Cucamonga Peak 7.5' quadrangle, San Bernardino 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/of01-311 End_Group Keyword: geologic map Keyword: geology Keyword: bedrock geology Keyword: surficial geology Keyword: San Jacinto Fault Keyword: Cucamonga Fault Keyword: San Gabriel Mountains Keyword: Pelona Schist Group: Temporal_Coverage Start_date: 19740401 Stop_date: 19810801 End_Group Data_Set_Progress: Complete Group: Spatial_Coverage Southernmost_Latitude: 34.1249841 Northernmost_Latitude: 34.24999995 Westernmost_Longitude: -117.62509226 Easternmost_Longitude: -117.49990774 End_Group Location: California Location: San Bernardino County Location: Cucamonga Peak 7.5' quadrangle Group: Data_Resolution Latitude_Resolution: 0.0027668485417 Longitude_Resolution: 0.0027668485417 End_Group Access_Constraints: None Use_Constraints: The Cucamonga Peak 7.5' geologic-map database should be used to evaluate and understand the geologic character of the Cucamonga Peak 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 Group: Data_Center_Contact Last_name: U.S. Geological Survey Information Services First_name: N/A Phone: 303-202-4700 Group: Address Box 25286 Denver Federal Center Denver, CO 80225 USA End_Group End_Group End_Group Storage_Medium: SunOS, 5.7, sun4u UNIX ARC/INFO version 7.2.1 Group: Distribution Distribution_Media: online Distribution_Format : ArcInfo export (e00) Distribution_Size: 2.9 megabytes Fees: none End_Group Group: Multimedia_Sample URL: http://geopubs.wr.usgs.gov/open-file/of01-311/images/cuc_map.jpg Format: JPEG Group: Description Non-navigable .jpg image of the geologic map, topographic base, Correlation of Map Units, Description of Map Units and key to point and line symbols. 400x406 pixels, 32-bit RGB true color, 45k bytes. End_Group End_Group Group: Multimedia_Sample URL: http://geopubs.wr.usgs.gov/open-file/of01-311/cuc_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. 3.3 megabytes. End_Group End_Group Group: Reference Citation_Information: Originator: D.M. Morton Publication_Date: 1976 Title: Geologic map of the Cucamonga fault zone between San Antonio Canyon and Cajon Creek, southern California Edition: Version 1.0 Geospatial_Data_Presentation_Form: paper map Series_Information: Series_Name: U.S. Geological Survey Open-File Report Issue_Identification: 76-726 Publication_Information: Publication_Place: Menlo Park, California Publisher: U.S. Geological Survey End_Group Group: Summary The data set for the Cucamonga Peak 7.5' quadrangle has been 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 Geographical 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. The digital geologic map database for the Cucamonga Peak 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, the U.S. Forest Service and the San Bernardino National Forest may use the map and data base as a basic geologic data source for soil studies, mineral resource evaluations, road building, biological surveys, and general forest management. The Cucamonga Peak database is not suitable for site-specific geologic evaluations at scales greater than 1:24,000 (1in = 2,000 ft.). This data set maps and describes the geology of the Cucamonga Peak 7.5' quadrangle, San Bernardino County, California. Created using Environmental Systems Research Institute's ARC/INFO software, the database consists of the following items: (1) a map coverage containing geologic contacts and units, (2) a coverage containing site-specific structural data, (3) a coverage containing geologic-unit label leaders and their associated 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), an index map, a regional geologic and structure map, and a key for point and line symbols; (2) PDF files of this Readme (including the metadata file as an appendix) and the graphic produced by the PostScript plot file. The Cucamonga Peak quadrangle includes part of the boundary between two major physiographic provinces of California, the Transverse Ranges Province to the north and the Peninsular Ranges Province to the south. The north part of the quadrangle is in the eastern San Gabriel Mountains, and the southern part includes an extensive Quaternary alluvial-fan complex flanking the upper Santa Ana River valley, the northernmost part of the Peninsular Ranges Province. Thrust faults of the active Cucamonga Fault zone along the the south margin of the San Gabriel Mountains are the rejuvenated eastern terminus of a major old fault zone that bounds the south side of the western and central Transverse Ranges (Morton and Matti, 1993). Rejuvenation of this old fault zone, including the Cucamonga Fault zone, is apparently in response to compression in the eastern San Gabriel Mountains resulting from initiation of right-lateral slip on the San Jacinto Fault zone in the Peninsular Ranges. Within the northern part of the quadrangle are several arcuate-in-plan faults that are part of an antiformal, schuppen-like fault complex of the eastern San Gabriel Mountains. Most of these arcuate faults are reactivated and deformed older faults that probably include the eastern part of the San Gabriel Fault. The structural grain within the San Gabriel Mountains, as defined by basement rocks, is generally east striking. Within the Cucamonga Peak quadrangle, these basement rocks include a Paleozoic schist and gneiss sequence which occurs as large, continuous and discontinuous bodies intruded by Cretaceous granitic rocks. Most of the granitic rocks are of tonalitic composition, and many are mylonitic. South of the granitic rocks is a comple assemblage of Proterozoic(?) metamorphic rocks, at least part of which is metasedimentary. This assemblage is intruded by Cretaceous tonalite on its north side, and by charnockitic rocks near the center of the mass. The charnockitic rocks are in contact with no other Cretaceous granitic rocks. Consequently, their relative position in the intrusive sequence is unknown. The Proterozoic(?) assemblage was metamorphosed to upper amphibolite and lower granulite grade, and subsequently to a lower metamorphic grade. It is also intensely deformed by mylonitization characterized by an east-striking, north-dipping foliation, and by a pronounced subhorizontal lineation that plunges shallowly east and west. The southern half of the quadrangle is dominated by extensive, symmetrical alluvial-fan complexes, particularly two emanating from Day and Deer Canyons. Other Quaternary units ranging from early Pleistocene to recent are mapped, and represent alluvial-fan, landslide, talus, and wash environments. The geologic map database contains original U.S. Geological Survey data generated by detailed field observation and by interpretation of aerial photographs. This digital Open-File map supercedes an older analog Open-File map of the quadrangle, and includes extensive new data on the Quaternary deposits, and revises some fault and bedrock distribution within the San Gabriel Mountains. The digital map was compiled on a base-stable cronoflex copy of the Cucamonga Peak 7.5' topographic base and then scribed. This scribe guide was used to make a 0.007 mil blackline clear-film, from which lines and point were hand digitized. Lines, points, and polygons were subsequently edited at the USGS using standard ARC/INFO commands. Digitizing and editing artifacts significant enough to display at a scale of 1:24,000 were corrected. 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. End_Group Group: DIF_Author Last_name: Cossette First_name: Pamela Middle_name: M. Email: pcossette@usgs.gov Phone: 509-368-3123 Group: Address U.S. Geological Survey West 904 Riverside Avenue Spokane, Washington 99201-1087 USA End_Group End_Group DIF_Revision_Date: 20010917 Science_Review_Date: