USGS Geoscience Data Catalog
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C H. Gray, Jr., Morton, Douglas M., and F. Harold Weber, Jr., 2002, Geologic Map of the Corona South 7.5' Quadrangle, Riverside and Orange Counties, California: U.S. Geological Survey Open-File Report 02-21, U.S. Geological Survey, Menlo Park, California.
This is a Vector data set. It contains the following vector data types (SDTS terminology):
The map projection used is Polyconic.
Planar coordinates are encoded using coordinate pair
Abscissae (x-coordinates) are specified to the nearest 1.000366687774
Ordinates (y-coordinates) are specified to the nearest 1.000366687774
Planar coordinates are specified in Meters
The horizontal datum used is North American Datum of 1927.
The ellipsoid used is Clarke 1866.
The semi-major axis of the ellipsoid used is 6378206.4.
The flattening of the ellipsoid used is 1/294.98.
CRS_GEO.PAT: COLUMN ITEM NAME WIDTH OUTPUT TYPE N.DEC ALTERNATE NAME 1 AREA 4 12 F 3 5 PERIMETER 4 12 F 3 9 CRS_GEO# 4 5 B - 13 CRS_GEO-ID 4 5 B - 17 LABL 35 35 C - 52 SHD 3 3 I - 55 PLABL 35 35 C - 90 SHDFIL 3 3 I - 93 NAME 200 200 C - CRS_GEO.AAT: COLUMN ITEM NAME WIDTH OUTPUT TYPE N.DEC ALTERNATE NAME 1 FNODE# 4 5 B - 5 TNODE# 4 5 B - 9 LPOLY# 4 5 B - 13 RPOLY# 4 5 B - 17 LENGTH 4 12 F 3 21 CRS_GEO# 4 5 B - 25 CRS_GEO-ID 4 5 B - 29 LTYPE 35 35 C - 64 L-SYMB 3 3 I -
|Qywg||Young wash deposits, gravel|
|Qyfbg||Young alluvial fan deposits, boulder gravel and gravel|
|Qyfg||Young alluvial fan deposits, gravel|
|Qyf1g||Young alluvial fan deposits, Unit 1, gravel|
|Qyaa||Young alluvial channel deposits, arenaceous|
|Qyag||Young alluvial channel deposits, gravel|
|Qyls||Young landslide deposits|
|Qof||Old alluvial fan deposits|
|Qofa||Old alluvial fan deposits, arenaceous|
|Qofg||Old alluvial fan deposits, gravel|
|Qof1g||Old alluvial fan deposits, Unit 1, gravel|
|Qols||Old landslide deposits|
|Qvofg||Very old alluvial fan deposits, gravel|
|Qvof1g||Very old alluvial fan deposits, Unit 1, gravel|
|Qvoa||Very old alluvial channel deposits|
|Qvoag||Very old alluvial channel deposits, gravel|
|QTn||Late Cenozoic sedimentary rocks in Norco area|
|Tpsc||Sycamore Canyon Member of Puente Formation|
|Tvs||Vaqueros and Sespe Formations, undifferentiated|
|Tvss||Vaqueros, Sespe, Santiago and Silverado Formations, undifferentiated|
|Kwl||Williams and Ladd Formations, undifferentiated|
|Klhs||Holz Shale Member of Ladd Formation|
|Klbc||Baker Canyon Conglomerate Member of Ladd Formation|
|Kcg||Monzogranite of Cajalco Pluton|
|Khg||Heterogeneous granitic rocks|
|Ks||Serpentinite within Santiago Peak Volcanics|
|Kc||Carbonate-silicate rock spatially associated with serpentinite (Ks)|
|Kvsp||Santiago Peak Volcanics|
|Kvspi||Intrusive rocks associated with Santiago Peak Volcanics|
|Kvem||Estelle Mountain volcanics of Herzig (1991)|
|Jbc||Bedford Canyon Formation|
|Jbm||Marble (limestone) of Bedford Canyon Formation|
|Mzu||Mesozoic metasedimentary rocks, undifferentiated|
|fault, approx. located|
|Kvspi, porphyritic dike|
|vertical igneous joint|
Geologic mapping and digital preparation of this report were sponsored jointly by (1) the National Cooperative Geologic Mapping Program of the U.S. Geological Survey, (2) the California Division of Mines and Geology, and (3) the Southern California Areal Mapping Project (SCAMP).
(909) 276-6397 (voice)
(909) 276-6295 (FAX)
The data set for the Corona South 7.5' quadrangle was 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 Geographic 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.
Person who carried out this activity:
(909) 276-6397 (voice)
(909) 276-6295 (FAX)
Morton, D.M., 1999, Preliminary digital geologic map of the Santa Ana 30'x60' quadrangle, southern California, version 1.0.: U.S. Geological Survey Open-File Report 99-172, U.S. Geological Survey, California.
Geologic-map units in the Corona South quadrangle database were described using standard field methods. Consistent with these methods, the database author has assigned standard geologic attributes to geologic lines, points, and polygons identified in the database.
Nation-wide geologic-map accuracy standards have not been developed and adopted by the U.S. Geological Survey and other earth-science entities. Until such standards are adopted, the SCAMP project has developed internal map-accuracy standards for 1:24,000-scale geologic maps produced by the project.
Geologic lines and points on 1:24,000 scale geologic maps are judged to meet SCAMP's internal map-accuracy standards if they are located to within +/-15 meters, relative to topographic or cultural features on the base map.
On any derivative geologic-map plot, line data that are judged to meet the SCAMP internal map-accuracy standard are denoted by solid lines; line data that may not meet the SCAMP internal map-accuracy standard are denoted by dashed or dotted lines. There is no cartographic device for denoting the map-accuracy for geologic-point data (e.g., symbols representing bedding, foliation, lineations, etc.).
The maximum transformation RMS error acceptable for a 7.5' quadrangle transformation and data input is 0.003 (1.8 meters). Horizontal positional accuracy was checked by visual comparison of hard-copy plots with base-stable source data.
The geologic map database of the Corona South 7.5' quadrangle contains new data that have been subjected to rigorous review and are a substantially complete representation of the current state of knowledge concerning the geology of the quadrangle.
Polygon and chain-node topology present. The areal extent of the map is represented digitally by an appropriately projected (polyconic projection), mathematically generated box. Consequently, polygons intersecting the lines that comprise 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
- The Corona South 7.5' geologic-map database should be used to evaluate and understand the geologic character of the Corona South 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 many actual and potential geologic hazards represented by faults and landslides and posed by ground subsidence and earthquake-generated ground shaking. However, 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 Hart, 1988).
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 most of the map, the resolution of the combined output will be limited by the lower resolution data.
USGS Open-File Report 02-21
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 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 the delivery, installation, operation, or support by USGS.
This digital geologic map database of the Corona South 7.5' quadrangle, 1:24,000 map-scale, and any derivative maps thereof, is not meant to be used or displayed at any scale larger than 1:24,000 (e.g., 1:12,000).
|Data format:||Geologic units and structural features, with TIFF image of the base map in format ARCE (version 7.2.1) Size: 2.2 megabytes|