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Title:
Surficial geologic map and geodatabase, Cuddeback Lake 30' x 60' Quadrangle, San Bernardino and Kern Counties, California
Abstract:
A USGS surficial geologic mapping project, focused on the arid Southwest USA, conducted mapping and process studies to investigate landscape development and tectonic evolution. This project included the Cuddeback Lake 1:100,000-scale quadrangle located in the western Mojave Desert north-northeast of Los Angeles, between the southern Sierra Nevada and San Bernardino Mountains, in Kern and San Bernardino Counties, California. Geomorphic features include high-relief mountains, small hills, volcanic domes, pediments, broad alluvial valleys, and dry lakes. The mapped area includes pre-Tertiary plutonic, metavolcanic, metasedimentary, and other metamorphic rocks; Tertiary sedimentary and volcanic rocks; and Quaternary sediments and basalts. Included in the area are the El Paso, Lockhart, Blackwater, and Muroc faults as well as the central segment of the Garlock fault zone. The tectonically active western Mojave Desert and the variety of surficial materials have resulted in distinctive geomorphic features and terrains.
Mapping has shown that the tectonically active area near the Garlock fault zone and El Paso Fault influenced development of drainage networks; base level is controlled by fault offset. There is evidence of a late Tertiary drainage network preserved in remnants of alluvial fans and paleo-drainage deposits north of the El Paso Mountains, west of the Lava Mountains, and south and west of the Rand Mountains. Faults identified as being active in the Holocene based on displaced stream channels, scarps, and shutter ridges include the Cantil Valley, Lockhart, Garlock, and Rand Mountain faults. Previously unmapped Holocene and late Pleistocene fault strands identified near the Rand Mountains may represent a splay at the northwest termination of the Lockhart Fault. The informally named Grass Valley fault, NW of Black Mountain, is a right-lateral strike-slip fault that may be a splay of the Blackwater Fault. Holocene activity on the Grass Valley fault is indicated by one displaced early Holocene stream terrace. Mapped faults in Fremont Valley are tentatively identified as surficial expressions of the buried Cantil Valley fault.
Supplemental_Information:
The feature dataset 'Cuddeback' contains the feature classes 'cudd_contacts', 'cudd_faults', and 'cudd_polygons'. The 'cudd_contacts' arcs were used to build the polygons. The polygons are attributed using the 'cudd_unit_labels'. These then define the geologic units. These feature classes are topologically related and maintained in the geodatabase by the set of validation rules defined in 'Cuddeback_Topology'.
Lee Amoroso and David M. Miller, 2006, Surficial geologic map and geodatabase, Cuddeback Lake 30' x 60' Quadrangle, San Bernardino and Kern Counties, California: U.S. Geological Survey Open File Report OFR 2006-1276.
Beginning_Date: 1999
Ending_Date: 2005
Currentness_Reference: publication date
Geospatial_Data_Presentation_Form: vector digital data
Entity_and_Attribute_Overview:
Surficial geologic units are commonly thin (<2 m) veneers over older units including bedrock. Where this is common, the unit descriptors are shown on the map separated by a slash (/). The younger, overlying unit is listed first. For example, Qya/Qoa indicates a veneer of younger alluvial deposits overlying old alluvial deposits and Qye/fpg indicates a young eolian deposit over grus-producing felsic plutonic rock. This usage also applies to hillslope deposits, for example Qha/mv indicates abundant hillslope deposits over mafic volcanic rock.
The areal extent of some deposits is too small to show at the map scale. These are indicated by two or more deposits separated by a plus sign (+). The most common deposit is listed first, for example Qiag+Qoag indicates that both deposits are present and Qiag is more abundant than Qoag. Other deposits may be present and are less than 20% of the unit area. Compound units may also be veneers on older deposits. For instance, the unit Qye+Qae/Qilg indicates that the mixed eolian unit Qye+Qae overlies an older lacustrine unit.
Entity_and_Attribute_Detail_Citation:
Detailed description of entity and attribute information found in metadata for each feature class.
Lee Amoroso
U.S. Geological Survey
Geologist
2255 North Gemini Drive
Flagstaff, Arizona 86001
USA
928-556-7186 (voice)
928-556-7169 (FAX)
lamoroso@usgs.gov
One of a series of 1:100,000 scale surficial maps and geologic databases of the Mojave Desert region produced to aid in understanding the potential long-term effects of urban development and land use. The multi-purpose surficial geologic maps and databases produced by this project contain information that is being used for land-management decisions with regard to (1) ground-water availability, (2) natural hazard risks, such as earthquakes, landslides, and debris flows, (3) ecosystem sustainability, (4) effects of climate change, and (5) soil compaction.
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This report is designed to describe completely the surficial geology at a 1:100,000 scale. Geologic information only mappable at a larger scale has been included in portions of the map to illustrate geomorphic response to neotectonism. All geospatial database elements are attributed.
Polygon and chain-node topology present. Polygons intersecting the lines that compose 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.
Are there legal restrictions on access or use of the data?
Access_Constraints: None
Use_Constraints:
Uses of this digital geologic map 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 for a scale of 1:100,000 means that higher resolution information is not present in the dataset. Plotting at scales larger than 1:100,000 will not yield greater real detail, although it may reveal fine-scale irregularities below the intended resolution of the database. Similarly, 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.
Any hardcopies utilizing these datasets shall clearly indicate their source. If users modify the data in any way they are obligated to describe the types of modifications they have performed. User specifically agrees not to misrepresent these datasets, nor to imply that changes they made were approved by the U.S. Geological Survey.
U.S. Geological Survey Information Services
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Denver, CO 80225
USA
1-888-ASK-USGS (voice)
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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 consititute 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 the USGS.
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Dates:
Last modified: 16-Aug-2006
Metadata author:
Lee Amoroso
U.S. Geological Survey
Geologist
2255 North Gemini Drive
Flagstaff, Arizona 86001
USA
928-556-7186 (voice)
928-556-7169 (FAX)
lamoroso@usgs.gov
Metadata standard:
FGDC Content Standards for Digital Geospatial Metadata
Generated by mp version 2.8.6 on Wed Aug 16
14:39:13 2006
Modified November 28, 2006 (mfd)