|Jmi||Mafic and intermediate intrusive suite (Middle or Early Jurassic)|
|Jql||Quartz latite (Late Jurassic)|
|Jsbe||Quartz monzonite, monzogranite, and granodiorite, equigranular (Middle Jurassic)|
|Jsbp||Porphyritic quartz monzonite, monzogranite, and granodiorite of San Bernardino Wash (Middle Jurassic)|
|Prid||Dolomite of Iron Chief mine (Middle or Early Proterozoic)|
|Prpqgl||Quartzite of Pinto Mountain, light gray unit (Middle or Early Proterozoic)|
|Prpqp||Quartzite of Pinto Mountain, pelitic unit (Middle or Early Proterozoic)|
|Prpqw||Quartzite of Pinto Mountain, white unit (Middle or Early Proterozoic)|
|QTcq||Conglomerate, quartzite-clast (Pleistocene and (or) Pliocene)|
|QTsu||Sedimentary deposite, undivided (Pleistocene and (or) Pliocene)|
|Qoam1||Old alluvial deposits, middle unit 1 (middle and early Pleistocene)|
|Qoam2||Old alluvial deposits, middle unit 2 (middle? Pleistocene)|
|Qoam3||Old alluvial deposits, middle unit 3 (late Pleistocene)|
|Qoay||Old alluvial deposits, young unit (Holocene and (or) Pleistocene)|
|Qoc3||Old colluvial deposits, Unit 3 (Pleistocene)|
|Qocu||Old colluvial deposits, undivided (Pleistocene)|
|Qvoa||Very old alluvial deposits (early Pleistocene)|
|Qvya1||Very young alluvial deposits, Unit 1 (late Holocene)|
|Qvya2||Very young alluvial deposits, Unit 2 (late Holocene)|
|Qvyau||Very young alluvial deposits, undivided (late Holocene)|
|Qvyye||Very young and (or) young eolian deposits (Holocene)|
|Qvyyp||Very young and (or) young playa deposits (Holocene)|
|Qyamg1||Young alluvial deposits, middle gravelly facies 1 (middle Holocene)|
|Qyamg2||Young alluvial deposits, middle gravelly facies 2 (middle Holocene)|
|Qyams||Young alluvial deposits, middle sandy facies (middle Holocene)|
|Qyamu||Young alluvial deposits, middle unit, undivided (middle Holocene)|
|Qyaog||Young alluvial deposits, old gravelly facies (middle and (or) early Holocene)|
|Qyaos||Young alluvial deposits, old oxidized sandy unit (middle and (or) early Holocene and late Pleistocene?)|
|Qyau||Young alluvial deposits, undivided (Holocene)|
|Qyaymu||Young alluvial deposits, young and middle units, undivided (late and middle Holocene)|
|Qyays||Young alluvial deposits, young sandy facies (late and (or) middle Holocene)|
|Qyayu||Young alluvial deposits, young unit, undivided (late and (or) middle Holocene)|
|Ts||Sedimentary deposits (late and (or) middle Mioocene)|
|Tb||Basalt (late and (or) middle Miocene|
|TJdu||Dike rocks, undivided (Tertiary, Cretaceous, and (or) Jurassic)|
|Jmi||Mafic and intermediate intrusive suite (Middle or Early Jurassic)|
|Jsb||Quartz monzonite, monzogranite, and granodiorite of San Bernardino Wash (Middle Jurassic)|
|Prpqg||Quartzite of Pinto Mountain, gray unit (Middle or Early Proterozoic)|
|Prpq||Quartzite of Pinto Mountain (Middle or Early Proterozoic)|
|Prems||Metasedimentary rocks of Eagle Mountains assemblage (Middle or Early Proterozoic)|
|Pre||Eagle Mountains assemblage (Proterozoic)|
|Qyamg||Young alluvial deposits, middle gravelly facies (middle Holocene)|
|Qyay||Young alluvial deposits, young unit (late and (or) middle Holocene)|
|Qyam||Young alluvial deposits, middle unit (middle Holocene)|
|Qyao||Young alluvial deposits, old unit (middle and (or) early Holocene)|
|Qoam||Old alluvial deposits, middle unit (Pleistocene)|
|Qoc||Old colluvial deposits (Pleistocene)|
|Qvya||Very young alluvial deposits, middle unit (late Holocene)|
|Qya||Young alluvial deposits (Holocene and late Pleistocene?)|
|Qoa||Old alluvial deposits (Holocene? and Pleistocene)|
|Qvyya||Very young and young alluvial deposits (Holocene)|
|Qovoa||Old and very old alluvial deposits (Pleistocene)|
|Qa||Alluvial deposits (Quaternary)|
|Qc||Colluvial deposits (Quaternary)|
|QTs||Sedimentary deposits (Pleistocene and (or) Pliocene)|
|Qvyye||Discontinuous Qvyye veneer on mapped unit|
|Qyams||Discontinuous Qyams veneer on mapped unit|
|Qyamu||Channeled domains Qyamu subequal in areal extent to domains of mapped unit|
|Qyaog||Channeled domains Qyaog subequal in areal extent to domains of mapped unit|
|questionable||Identity of unit is attributed as questionable where unit assignment based on interpretation of aerial photographs is uncertain.|
|cartographic, map boundary||The map boundary forms part of the perimeter of polygons that occur along the margins of the map.|
|contact||Boundary between two rock units; formed as fault, intrusive border, bedding plane, or unconformity|
|facies boundary||Intra-unit lithologic boundary between coeval deposits derived either from different source terranes or from different drainage basins in the same source terrane|
|fault-line scarp||Steep slope formed by differential erosion along a fault line|
|fault||Surface or zone of surfaces separating two bodies of rock and across which one body has slid past the other|
|Jql||Quartz latite (Jurassic)|
|TJdu||Dike rocks, undivided (Tertiary, Cretaceous, or Jurassic)|
The digital data set was prepared by Pamela Cossette.
Geologic mapping, topical studies, and digital preparation for this report were sponsored jointly by the following: (1) the National Cooperative Geologic Mapping Program of the U.S. Geological Survey, (2) California Geological Survey, and (3) the National Park Service (Joshua Tree National Park).
This database was prepared in the GIS laboratory at the Spokane Field Office of the USGS in Spokane, Washington. The facility is maintained primarily by the Mineral Resource Surveys Program and supported in part by the National Geologic Mapping Program.
Technical review by Fred K. Miller has led to significant improvements in the database and in the map plot file. Digital review by Scott Graham has allowed us to further improve the digital database.
The data set for the San Bernardino Wash 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 Wash 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 Wash database has been prepared in cooperation with the National Park Service as part of an ongoing project to provide Joshua Tree National Park with a geologic map base for use in managing Park resources and developing interpretive materials.
The digital geologic map database for the San Bernardino Wash quadrangle has been created as a general-purpose data set that is applicable to land-related investigations in the earth and biological sciences. Along with geologic map databases in preparation for adjoining quadrangles, the San Bernardino Wash database has been generated to further our understanding of bedrock and surficial processes at work in the region and to document evidence for seismotectonic activity in the eastern Transverse Ranges. The database is designed to serve as a base layer suitable for ecosystem and mineral resource assessment and for building a hydrogeologic framework for the Pinto Basin.
Are there legal restrictions on access or use of the data?
Use_Constraints:Spatial Resolution. Use of this digital geologic map should not violate the spatial resolution of the data. The San Bernardino Wash geologic map and database was developed using digital orthophotograph quarter quadrangles (DOQQs) as a base. DOQQs have a pixel resolution of 1 m and are accurate to a scale of 1:12,000 (1 in = 1,000 ft). Any enlargement beyond 1:12,000 exceeds the spatial resolution of the geologic data and should not be used in lieu of a more detailed site-specific geologic evaluation. Similarly, the digital topographic base map is derived from the U.S. Geological Survey, 1:24,000-scale San Bernardino Wash 7.5 minute quadrangle (provisional edition, 1986); any enlargement beyond 1:24,000 exceeds the spatial resolution of the topographic data. Plotting or viewing of the data at scales larger than 1:12,000 on the DOQQ base, or larger than 1:24,000 on the topographic base, will not yield greater real detail, although it may reveal fine-scale irregularities below the intended resolution of the database. Where the geologic data is used in combination with the topographic data, the resolution of the combined output is limited by the lower resolution of the topographic data. 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 of these data.
Content. This database, identified as "Geologic map and digital database of the San Bernardino Wash 7.5 minute quadrangle, Riverside County, California" has been approved for release and publication by the Director of the U.S. Geological Survey. Although this database has been subjected to rigorous review and is substantially complete, the USGS reserves the right to revise the data pursuant to further analysis and review. Furthermore, it is released on the condition that neither the USGS nor the United States Government may be held responsible for any damages resulting from its authorized or unauthorized use. This database 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, product, or firm names is for descriptive purposes only and does not imply endorsement by the U.S. Government.
Faults. The San Bernardino Wash database is sufficiently detailed to identify and characterize many actual and potential geologic hazards represented by faults, but 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, for example, Hart, 1988; Hart and Bryant, 1997).
Hart, E. W., 1988, Fault-rupture zones in California; Alquist-Priolo Special Studies Zones Act of 1972 with index to special studies zones maps (revised, 1988): California Division of Mines and Geology Special Publication 42.
Hart, E. W., and Bryant, W.A., 1997, Fault-rupture zones in California; Alquist-Priolo Special Studies Zones Act of 1972 with index to special studies zones maps (revised, 1997): California Division of Mines and Geology Special Publication 42.
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 any particular purpose. The burden for determining 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 delivery, installation, operation, or support by USGS.
This digital, geologic map database of the San Bernardino Wash 7.5'quadrangle, and any derivative maps thereof, is not meant to be used or displayed at any map scale larger than 1:12,000 on the DOQQ base or 1:24,000 on the topograhic base.
|Data format:||Geologic units and structural features in format ARCE (version 8.x) Size: 2.3|