USGS Geoscience Data Catalog
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Kellogg, Karl S. , 2001, Geologic map of the Lockwood Valley quadrangle, Ventura County, California: U.S. Geological Survey Open-File Report 99-130, U.S. Geological Survey, Denver, Colorado.Online Links:
This is a Vector data set.
The map projection used is Lambert Conformal Conic.
Planar coordinates are encoded using coordinate pair
Abscissae (x-coordinates) are specified to the nearest 10
Ordinates (y-coordinates) are specified to the nearest 10
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.
LWPOLY.PAT COLUMN ITEM NAME WIDTH OUTPUT TYPE N.DEC ALTERNATE NAME 1 AREA 8 18 F 5 9 PERIMETER 8 18 F 5 17 LWPOLY# 4 5 B - 21 LWPOLY-ID 4 5 B - 25 SOURCE 4 4 I - 29 LABEL 10 10 C - 39 DESC 100 100 C - 139 SYMBOL 3 3 I - LWPOLY.CON COLUMN ITEM NAME WIDTH OUTPUT TYPE N.DEC ALTERNATE NAME 1 LINECODE 3 3 I - 4 SYMBOL 3 3 I - 7 TYPE 10 10 C - 17 MODIFIER 20 20 C - 37 CERTAINTY 15 15 C - 52 DESC 100 100 C - LWPOLY.STR COLUMN ITEM NAME WIDTH OUTPUT TYPE N.DEC ALTERNATE NAME 1 LINECODE 3 3 I - 4 SYMBOL 3 3 I - 7 TYPE 10 10 C - 17 HORIZONTAL 20 20 C - 37 VERTICAL 20 20 C - 57 FOLD 15 15 C - 72 PLUNGE 15 15 C - 87 ACCURACY 15 15 C - 102 CERTAINTY 15 15 C - 117 DESC 100 100 C - LWPOLY.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 8 18 F 5 25 LWPOLY# 4 5 B - 29 LWPOLY-ID 4 5 B - 33 LINECODE 3 3 I - 36 NAME 30 30 C - 66 SOURCE 4 4 I - 70 SYMBOL 3 3 I - LWPOLY.REF COLUMN ITEM NAME WIDTH OUTPUT TYPE N.DEC ALTERNATE NAME 1 SOURCE 4 4 I - 5 SCALE 8 8 I - 13 AUTHORS 200 200 C - 213 YEAR 4 4 I - 217 REFERENCE 250 250 C -lwline coverage: contains limit of overturned strata, cross-section lines, and a synclinal fold axis line. In the lwline.aat INFO file the NAME item indicates the name given to the structural feature. The SOURCE item contains the numeric code used to identify the data source for the structural feature. The DESC item contains the written description or explanation of the contact, boundary, or structural feature. The SYMBOL item contains the lineset symbol number used by ArcInfo to plot a line. The symbol numbers in this coverage refer to the geol_sfo.lin lineset.
LWLINE.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 8 18 F 5 25 LWLINE# 4 5 B - 29 LWLINE-ID 4 5 B - 33 LINECODE 3 3 I - 36 NAME 30 30 C - 66 SOURCE 4 4 I - 70 DESC 100 100 C - 170 SYMBOL 3 3 I - LWLINE.CON COLUMN ITEM NAME WIDTH OUTPUT TYPE N.DEC ALTERNATE NAME 1 LINECODE 3 3 I - 4 SYMBOL 3 3 I - 7 TYPE 10 10 C - 17 MODIFIER 20 20 C - 37 CERTAINTY 15 15 C - 52 DESC 100 100 C - LWLINE.STR COLUMN ITEM NAME WIDTH OUTPUT TYPE N.DEC ALTERNATE NAME 1 LINECODE 3 3 I - 4 SYMBOL 3 3 I - 7 TYPE 10 10 C - 17 HORIZONTAL 20 20 C - 37 VERTICAL 20 20 C - 57 FOLD 15 15 C - 72 PLUNGE 15 15 C - 87 ACCURACY 15 15 C - 102 CERTAINTY 15 15 C - 117 DESC 100 100 C - LWLINE.REF COLUMN ITEM NAME WIDTH OUTPUT TYPE N.DEC ALTERNATE NAME 1 SOURCE 4 4 I - 5 SCALE 8 8 I - 13 AUTHORS 200 200 C - 213 YEAR 4 4 I - 217 REFERENCE 250 250 C -lwpnt coverage: Contains points recording site-specific observations and measurements, such as strike and dip of bedding. In the lwpnt.pat INFO file the PTTYPE item lists the type of point symbol, e.g., strike and of inclined bedding. The SYMBOLCD item lists the marker symbol used by ArcInfo to identify the type of structural map symbol. Symbol numbers refer to the geoscamp2.mrk markerset. The STRIKE item contains the strike of bedding. Strike is an azimuthal angle (measured in degrees from 0 to 360 in a clockwise direction from North). The DIP item contains the dip of bedding. This value is an angle measured (in degrees 0 to 90) down from the horizontal; thus a horizontal dip is 0 degrees and a vertical dip is 90 degrees. The BEARING item contains the bearing of lineation. Bearing is an azimuthal angle (measured in degrees from 0 to 360 in a clockwise direction from North). The PLUNGE item contains the plunge of lineation. This value is an angle measured (in degrees 0 to 90) down from the horizontal; thus a horizontal plunge is 0 degrees and a vertical plunge is 90 degrees. The CALCANG item contains an interim value used to calculate SYM$ANGLE. The SYM$ANGLE item is the angle used to mathematically rotate the map point symbol to its proper orientation on the map. This item was set equal to the pseudoitem '$ANGLE' (calc SYM$ANGLE = $ANGLE). The SOURCE item lists the numeric code used to identify the data source.
LWPNT.PAT COLUMN ITEM NAME WIDTH OUTPUT TYPE N.DEC ALTERNATE NAME 1 AREA 8 18 F 5 9 PERIMETER 8 18 F 5 17 LWPNT# 4 5 B - 21 LWPNT-ID 4 5 B - 25 PTTYPE 80 80 C - 105 SYMBOLCD 3 3 I - 108 STRIKE 3 3 I - 111 DIP 3 3 I - 114 BEARING 3 3 I - 117 PLUNGE 3 3 I - 120 CALCANG 4 4 I - 124 SYM$ANGLE 4 4 I - 128 SOURCE 4 4 I - LWPNT.REF COLUMN ITEM NAME WIDTH OUTPUT TYPE N.DEC ALTERNATE NAME 1 SOURCE 4 4 I - 5 SCALE 8 8 I - 13 AUTHORS 200 200 C - 213 YEAR 4 4 I - 217 REFERENCE 250 250 C -Auxiliary files:
LABEL DESC Qa Alluvium (Holocene) Qc Colluvium (Holocene) Qac Alluvium, loess, and colluvium, undifferentiated (Holocene) Qls Landslide deposits (Holocene) Qt Talus (Holocene) Qdf Debris-flow deposit (Holocene and upper Pleistocene) Qlo Older landslide deposit (upper? Pleistocene) Qoa Older alluvium (upper? Pleistocene) Qbd Boulder diamicton (Pleistocene) Qhc High-level conglomerate (lower? Pleistocene) Tqc Quatal Formation, sandstone and conglomerate member (Pliocene) Tqs Quatal Formation, sandstone and siltstone member (Pliocene) Tqa Quatal Formation, arkosic member (Pliocene) Tqb Quatal Formation, brown member (Pliocene) Tqg Quatal Formation, green claystone and sandstone member (Pliocene) Tlc Lockwood Clay (Pliocene or Miocene) Tc Caliente Formation, undifferentiated (Miocene) Tcs Caliente Formation, green claystone and sandstone member (Miocene) Tjm Juncal Formation, mixed shale and sandstone member (Eocene) Tjs Juncal Formation, sandstone member (Eocene) Tjc Juncal Formation, conglomerate member (Eocene) Kgs Quartz monzonite of Sheep Creek (Upper Cretaceous) Kgl Granodiorite of Lockwood Mountain (Upper Cretaceous) Pag Frazier Mountain augen gneiss (Lower Proterozoic) Pbg Biotite gneiss (Lower Proterozoic) Pqfg Quartzofeldspathic gneiss (Lower Proterozoic) DEFINITION OF LINECODES IN THE COVERAGES (LINECODES AND DESC IN THE .CON AND .STR FEATURES IN THE DATABASE------------------------- LINECODE | DESC 1 | contact 2 | contact, approximate (dashed) 3 | contact, concealed (dotted) 41 | water body 81 | map boundary (lines of latitude or longitude) 88 | limit of overturned strata 98 | cross-section line 102 | fault, unknown offset, approximate (dashed) 103 | fault, unknown offset, concealed (dotted) 111 | normal fault 112 | normal fault, approximate (dashed) 113 | normal fault, concealed (dotted) 161 | reverse fault 162 | reverse fault, approximate (dashed) 163 | reverse fault, concealed (dotted) 173 | thrust fault, concealed (dotted) 403 | horizontal anticline, concealed 404 | plunging anticline, approximate 406 | plunging anticline, concealed 412 | double plunging anticline (out), concealed 413 | horizontal syncline 415 | horizontal syncline, concealed 416 | plunging syncline 417 | plunging syncline, approximate 418 | plunging syncline, concealed 442 | overturned syncline, concealed
Compilation of map by Karl Kellogg; Radiometric data by Wayne Premo.
To update and reinterpret earlier geologic mapping, and to achieve a uniform regional geologic database.
Data were entered and checked by the geologist that made the observations. The attributes of this geospatial data set consist of text identifiers and numeric codes that indicate the identity of the geologic unit or type of geologic feature, and determine how each feature is colored or symbolized. To check attribute accuracy, a color check plot was visually compared to the geologist's original compilation. Discrepancies between the digital geospatial dataset and the original analog compilation were corrected as needed. Machine-created listings of unique attribute values were used to identify spelling errors or other inconsistencies, and corrections were made as needed.
Lines were primarily mapped by ground investigation and photointerpretation of 1:24,000-scale color aerial photographs. These lines were digitized from the topographic field sheets and from annotated aerial photographs. Most digitized positions on the map are estimated to have about 20 m horizontal accuracy. Additional point observations were added using positions determined by a Rockwell PLGR-96 GPS unit with horizontal accuracy of about 10 meters. There is no elevation data in the database.
Data are complete: no features were eliminated or generalized. Unit properties are described in the text explanation.
Map elements were visually checked for overshoots, undershoots, duplicate features, polygon attributes, and other errors. Automated (ARC/INFO) routines were also used to check the databases for polygon label errors, line or point attribution errors, sliver polygons, dangling arcs, intersection errors, and projection information. The map was reviewed by one other geologist for consistency with basic geologic principles and general conformity to USGS mapping standards.
Are there legal restrictions on access or use of the data?
- Access_Constraints: none
- Use_Constraints:
- none. Acknowledgment of the U.S. Geological Survey would be appreciated in products derived from these data.
303-236-5486 (voice)
tpinto@usgs.gov
Although this digital spatial data has been subjected to rigorous review and is substantially complete, it is released on the condition that neither the USGS nor the United States Government may be held liable for any damages resulting from its authorized or unauthorized use. This map is preliminary and has not been reviewed for conformity with U.S. Geological Survey editorial standards or with the North American Stratigraphic Code.
Data format: | ARCE, SHP (version 8.0.2) |
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Network links: |
<http://pubs.usgs.gov/of/1999/ofr-99-0130/ofr-99-0130.zip> |
Data format: | ARCE, SHP (version 8.0.2) |
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Network links: |
<http://pubs.usgs.gov/of/1999/ofr-99-0130/ofr-99-0130.tar.gz> |
1-888-ASK-USGS (voice)
OFR-99-0130 (Map-on-Demand)
None
Available as one printed sheet plus one pamphlet. Order from USGS at the address listed above or see <http://rmmcweb.cr.usgs.gov/public/mod/> for more information.
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303-236-1305 (voice)