Entry_ID: (required) Entry_Title: Preliminary Geologic Map of the San Bernardino 30' x 60' quadrangle, California Group: Data_Set_Citation Originator(s): Douglas M. Morton (compiler); Fred K. Miller (compiler) Title: Preliminary Geologic Map of the San Bernardino 30' x 60' quadrangle, California Publication: U.S. Geological Survey Open-File report Publication_Date: 2003 Publication_Place: Menlo Park, California Publisher: U.S. Geological Survey Edition: Version 1.0 Data_Presentation_Form: map URL: http://pubs.usgs.gov/of/2003/of03-293/ End_Group Keyword: geology Keyword: geologic maps Keyword: surficial geologic units Keyword: bedrock geologic units Keyword: geologic structure Keyword: faulting (geologic) Keyword: geospatial datasets Keyword: Pelona Schist Keyword: Mount Lowe intrusive suite Keyword: Harold Formation Keyword: Juniper Hills Formation Keyword: Punchbowl Formation Keyword: Glendora Volcanics Keyword: Tertiary granitic rocks Keyword: San Francisquito Formation Keyword: Mill Creek Formation of Gibson (1971) Keyword: Shoemaker Gravel Keyword: Phelan Peak deposits of Weldon (1984) Keyword: Crowder Formation Keyword: Rattlesnake Mountain pluton of MacColl (1964) Keyword: Monzonite of Fawnskin Keyword: Bird Spring Formation Keyword: Monte Cristo Limestone Keyword: Sultan Limestone Keyword: Bonanza King Formation Keyword: Carrara Formation Keyword: Zabriskie Quartzite Keyword: Wood Canyon Formation Keyword: Stirling Quartzite Group: Temporal_Coverage Start_date: 2001 Stop_date: 2003 End_Group Data_Set_Progress: Complete Group: Spatial_Coverage Southernmost_Latitude: 33.99593574 Northernmost_Latitude: 34.50409269 Westernmost_Longitude: -118.00593183 Easternmost_Longitude: -116.99999913 End_Group Location: southern California Location: San Bernardino County Location: Riverside County Location: Los Angeles County Location: Peninsular Ranges Location: San Gabriel Mountains Location: San Bernardino Mountains Location: Transverse Ranges Group: Data_Resolution Latitude_Resolution: 0.000000191346 Longitude_Resolution: 0.000000191346 End_Group Access_Constraints: None Use_Constraints: The San Bernardino 30' x 60' geologic-map database should be used to evaluate and understand the geologic character of the San Bernardino 30' x 60' 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 most 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. Use of this digital geologic map should not violate the spatial resolution of the data. The San Bernardino 30' x 60' database was compiled from many sources including: (1) 1:62,500 reconnaisance mapping, (2) mapping from 1:24,000 USGS Open-File releases, (3) unpublished 1:24,000 mapping (4) Quaternary mapping from interpretation of 1:24,000 aerial photography, and (5) detailed 1:9,600 and 1:12,000 mapping from California Geological Survey Open-File releases. See Sheet 5, figure 3 for detailed sources of mapping. Any enlargement beyond the spatial resolution of the original geologic source data violates the spatial resolution of the data. Similarly, the digital topographic base data are derived from the U.S. Geological Survey, 1:100,000-scale San Bernardino 30' x 60' Digital Line Graphs (DLGs); any enlargement beyond this scale may be misleading. Where this database is used in combination with other data of higher resolution, the resolution of the combined output will be limited by the lower resolution data. No part of the database is intended to serve for site-specific studies. Examination of a plot of the geologic map (Sheet 1) indicates detail in some areas that is far to fine to show well at 1:100,000 scale. This detail is purposely maintained to draw attention to areas where detailed information, compiled from large-scale maps is available. This detail may be viewed by on-screen examination of the digital map coverage or by plotting selected areas at larger scales. However, any enlargement beyond the spatial resolution of the original geologic source data violates the spatial resolution of the data. Originating_Center: (required) Group: Data_Center Data_Center_Name: U.S. Geological Survey Information Services Dataset_ID: USGS Open-File Report 03-293 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, 5.8, sun4u UNIX ARC/INFO version 8.1 Group: Distribution Distribution_Media: online Distribution_Format : ARCE Distribution_Size: 35 Fees: none End_Group Group: Multimedia_Sample URL: http://pubs.usgs.gov/of/2003/of03-293/images/sb.gif Format: GIF Caption: Reduced-size image of the entire map sheet, 425x332 pixels, 72k bytes End_Group Group: Multimedia_Sample URL: http://pubs.usgs.gov/of/2003/of03-293/sanbern_map.pdf Format: PDF Caption: Navigable portable document format file (.pdf) image of the geologic map End_Group Group: Reference Citation_Information: Originator: Douglas M. Morton Publication_Date: 1999 Title: Preliminary Digital Geologic Map of the Santa Ana 30' x 60' Quadrangle, Southern California Geospatial_Data_Presentation_Form: map Edition: 1.0 Series_Information: Series_Name: U.S. Geological Survey Open-File Report Issue_Identification: 99-172 Publication_Information: Publication_Place: Menlo Park, California Publisher: U.S. Geological Survey Online_Linkage: http://pubs.usgs.gov/of/1999/of99-172/ End_Group Group: Summary The data set for the San Bernardino 30'x60' 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 Geological Survey. The San Bernardino 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 San Bernardino quadrangle database has been prepared in cooperation with the National Forest Service, as part of an ongoing project to provide the San Bernardino National Forest with a geologic map base for use in managing National Forest resources and in developing interpretive materials. The San Bernardino 30'x60' quadrangle, southern California, is diagonally bisected by the San Andreas Fault Zone, separating the San Gabriel and San Bernardino Mountains, major elements of California's east-oriented Transverse Ranges Province. Included in the southern part of the quadrangle is the northern part of the Peninsular Ranges Province and the northeastern part of the oil-producing Los Angeles basin. The northern part of the quadrangle includes the southern part of the Mojave Desert Province. Pre-Quaternary rocks within the San Bernardino quadrangle consist of three extensive, well-defined basement rock assemblages, the San Gabriel Mountains, San Bernardino Mountains, and the Peninsular Ranges assemblages, and a fourth assemblage restricted to a narrow block bounded by the active San Andreas Fault and the Mill Creek Fault. Each of these basement rock assemblages is characterized by a relatively unique suite of rocks that was amalgamated by the end of the Cretaceous and (or) early Cenozoic. Some Tertiary sedimentary and volcanic rocks are unique to specific assemblages, and some overlap adjacent assemblages. A few Miocene and Pliocene units cross the boundaries of adjacent assemblages, but are dominant in only one. Tectonic events directly and indirectly related to the San Andreas Fault system have partly dismembered the basement rocks during the Neogene, forming the modern-day physiographic provinces. Rocks of the four basement rock assemblages are divisible into an older suite of Late Cretaceous and older rocks and a younger suite of post-Late Cretaceous rocks. The age span of the older suite varies considerably from assemblage to assemblage, and the point in time that separates the two suites varies slightly. In the Peninsular Ranges, the older rocks were formed from the Paleozoic to the end of Late Cretaceous plutonism, and in the Transverse Ranges over a longer period of time extending from the Proterozoic to metamorphism at the end of the Cretaceous. Within the Peninsular Ranges a profound diachronous unconformity marks the pre-Late Cretaceous-post-Late Cretaceous subdivision, but within the Transverse Ranges the division appears to be slightly younger, perhaps coinciding with the end of the Cretaceous or extending into the early Cenozoic. Initial docking of Peninsular Ranges rocks with Transverse Ranges rocks appears to have occurred at the terminus of plutonism within the Peninsular Ranges. During the Paleogene there was apparently discontinuous but widespread deposition on the basement rocks and little tectonic disruption of the amalgamated older rocks. Dismemberment of these Paleogene and older rocks by strike-slip, thrust, and reverse faulting began in the Neogene and is ongoing. The Peninsular Ranges basement rock assemblage is made up of the Peninsular Ranges batholith and a variety of metasedimentary rocks. Most of the plutonic rocks of the batholith are granodiorite and tonalite in composition; primary foliation is common, mainly in the eastern part. Tertiary sedimentary rocks of the Los Angeles Basin crop out in the Puente and San Jose Hills along with the spatially associated Glendora Volcanics; both units span the boundary between the Peninsular Ranges and San Gabriel Mountains basement rock assemblages. The San Gabriel Mountains basement rock assemblage includes two discrete areas, the high standing San Gabriel Mountains and the relatively low San Bernardino basin east of the San Jacinto Fault. The basement rock assemblage is characterized by a unique suite of rocks that include anorthosite, Proterozoic and Paleozoic gneiss and schist, the Triassic Mount Lowe intrusive suite, extensive deformed and undeformed Cretaceous granitic rocks, the Pelona Schist, and Oligocene granitic rocks. Internal structure of the assemblage includes the Vincent Thrust Fault, at least two old, abandonded segments of the San Andreas Fault system, and extensive areas of well-developed to pervasively mylonitized rocks. The main body of the San Gabriel Mountains is bounded on the north by the San Andreas Fault and on the south by the Sierra Madre-Cucamonga Fault Zone. East of the San Jacinto Fault, the San Bernardino basin is an asymmetric pull-apart basin bounded by the San Andreas Fault on the east, and underlain by many of the same rock units that characterize the San Gabriel Mountains. Cretaceous and older rocks of the San Gabriel Mountains basement rock assemblage are divided into two structurally and lithologically distinct groups by the Vincent Thrust Fault, a regional, low-angle thrust fault that predates intrusion of Oligocene granitic rocks. The Vincent Thrust separates the Mesozoic Pelona Schist in its lower plate from highly deformed gneiss, schist, and granitic rocks in the upper plate. The fault, along with its far-offset, dismembered analogs in the Orocopia and Chocolate Mountains east of the Salton Sea, may underlie much of southern California. Crystalline rocks between the Mill Creek Fault and the main trace of the San Andreas Fault Zone range from highly deformed gneiss of unknown age to relatively undeformed Mesozoic biotite-hornblende diorite. They are overlain by Miocene sedimentary rocks and cut by the Wilson Creek Fault, that is considered to be an older segment of the San Andreas Fault system. Crystalline rocks of this basement assemblage are similar to rocks in the Little San Bernardino Mountains to the southeast, and appear to have been displaced about 50 km by the Wilson Creek and Mill Creek Faults. About 80 to 85 percent of the San Bernardino Mountains bedrock assemblage in the quadrangle is Mesozoic granitic rocks, and the rest, highly metamorphosed and deformed Late Proterozoic and Paleozoic metasedimentary rocks. There is a pronounced gradient from east to west, and to a slightly lesser degree from south to north, in the magnitude of both deformation and metamorphism of the Late Proterozoic and Paleozoic metasedimentary rocks. In addition to the east to west gradient of increasing metamorphism and deformation, east of the quadrangle there appears to be a sharp break between highly deformed and relatively undeformed Late Proterozoic and Paleozoic rocks. Late Proterozoic and Paleozoic units comprise a thick sequence of metasedimentary rocks generally consisting of a lower quartzitic sequence and an upper carbonate rock sequence. The entire lower quartzitic part is Late Proterozoic and Early Cambrian, and includes the Stirling Quartzite, Wood Canyon Formation and Zabriskie Quartzite; the upper carbonate rock sequence includes the Cambrian Carrara and Bonanza King Formations, the Devonian Sultan Limestone, the Mississippian Monte Cristo Limestone, and the Pennsylvanian Bird Spring Formation. Mesozoic intrusive rocks in the San Bernardino Mountains and southern Mojave Desert include numerous Triassic and Jurassic plutons. The Triassic rocks are relatively alkalic and quartz deficient, and contrast with the voluminous, quartz-rich, calc-alkalic Cretaceous granitic rocks, which make up the largest part of the San Bernardino Mountains assemblage. The voluminous tonalitic rocks in the San Gabriel Mountains and Peninsular Ranges assemblages are essentially absent in the western San Bernardino Mountains. Many areas of dominantly Cretaceous granitic rocks are mapped as Mesozoic mixed-rock units, because they are extremely heterogeneous, and include large components of older rocks. The relatively young, active San Andreas Fault system is by far the dominant structure in the San Bernardino quadrangle. Based on offsets of many of the rock units found in the San Bernardino quadrangle, different amounts of lateral displacement have been proposed for the San Andreas Fault system within and south of the Transverse Ranges. The Neogene evolution of the Transverse Ranges Province, and its relationship to the San Andreas Fault system in particular, are complicated by several abandonded segments and the shifting locus of the fault during the late Cenozoic. Most recent structural interpretations require relatively large rotations within the Transverse Ranges Province. Other active faults in the quadrangle include the San Jacinto Fault and the reverse faults bounding and within the Transverse Ranges. Older faults considered to be abandoned segments of the San Andreas Fault system include the San Gabriel Fault, Punchbowl Fault, Mission Creek Fault, and Wilson Creek Fault. The Vincent Thrust and Squaw Peak Fault are both older faults, the Vincent probably of late Mesozoic to early Tertiary age. The contents of this report consist of the following: >1. Geologic map database >2. Plot files for five sheets: > Sheet 1 Geologic map > Sheet 2 Correlation of Map Units > Sheet 3 List of map units > Sheet 4 Fault map > Sheet 5 Three figures, including index map, physiographic provinces map, and sources of data >3. A pamphlet containing: > a. A detailed Description of Map Units > b. A discussion of the regional geologic framework > c. Photographs of many rock units and geologic features Map nomenclature: 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. Map plot: Some contacts are very poorly located or are gradational over a very wide interval. Many of these contacts would normally be shown as scratch contacts, but at 1:100,000 scale lead to unclear map relationships. For the purposes of clarity, these scratch contacts are drawn on the map plot with a short dashed line. Dune crests within units Qoed3 and Qyed1 are mapped and recorded in the database, but are omitted from the geologic map plot file, because they obscure unit contacts. Dikes making up unit Kg are mapped and recorded in the database, but are omitted from the geologic map plot file because they are too concentrated and plot as a mass of indistinguishable lines. Intra-unit grain-size boundaries within generic Quaternary units are recorded in the database, but are in most cases poorly defined and poorly located, because the contacts are anastamosing and gradational. They also are omitted from the geologic map plot file. End_Group Group: Related_URL URL_Type: URL: http://pubs.usgs.gov/of/1999/of99-172/ Group: Description Originator: Douglas M. Morton Publication_Date: 1999 Title: Preliminary Digital Geologic Map of the Santa Ana 30' x 60' Quadrangle, Southern California Geospatial_Data_Presentation_Form: map Edition: 1.0 Series_Information: Series_Name: U.S. Geological Survey Open-File Report Issue_Identification: 99-172 Publication_Information: Publication_Place: Menlo Park, California Publisher: U.S. Geological Survey Online_Linkage: http://pubs.usgs.gov/of/1999/of99-172/ End_Group End_Group Group: DIF_Author Last_name: Schweitzer First_name: Peter Middle_name: N Email: pschweitzer@usgs.gov Phone: 703-648-6533 Group: Address Mail Stop 954 12201 Sunrise Valley Dr Reston, VA 20192-0002 USA End_Group End_Group DIF_Revision_Date: 20150204 Science_Review_Date: