|Description||Sediment magnetic, paleomagnetic and geochemical results have been obtained from lacustrine sediments recovered in a 30-meter core taken by rotary drilling methods at Grass Lake, Siskiyou County, California. The data have been analyzed and interpreted in|
|Originators||Best, Patti J.; Reynolds, Richard L.; Rosenbaum, Joseph G.; Drexler, John; and Adam, David. P.|
|Publication||U.S. Geological Survey Open-File Report 96-294|
Version 1.0 of the San Bernardino 30' x 60' quadrangle comprises nine ARC/INFO coverages, of which four contain geologic data, one contains cartographic features, three provide base-map, DLG-derived, reference data, and one contains the distribution of constituent 7.5' quadrangles: sanbern_geo (geology), sanbern_str (structural point data, fold axis and line ornamentation), sanbern_dk (dikes as linear elements), sanbern_flt (faults and annotation), sanbern_carto (geologic unit annotation, locality names), snbrn_hypso (hypsography), snbrn_hydro (hydrography), snbrn_transp (transportation and cultural data), and snbrn_quds (32 constituent 7.5' quadrangles). In addition to the customary software-defined attributes in each feature attribute table, user-defined attributes are included that allow the user access to more detailed geologic information including unit name, grain size where applicable, and rock assemblage. Two lookup tables are included: rockunit_color.lut (rockunit color assignment) and rockunit_pattern.lut (rockunit pattern assignment).
Polygon feature attribute table that stores alphanumeric symbols for units that characterize lithologic type and age of earth materials represented by each polygon, color assignment, unit name, subunit, and grain-size where applicable.
|SUBUNIT||Subdivisions of units with more than one component|
|GRAIN_SIZE||Characterizes grain-size of mapped Quaternary units where applicable.|
|ASSEMBLAGE||Identifies within which of the principle structural blocks a unit is located.|
Geologic contacts, faults, and map boundary.
|L-SYMB||Integer symbol (listed below along with line descriptions) that relates arc to cartographic line symbol in lineset: geoscamp2.lin|
|L-NAME||Formal name of fault feature|
|DESCR||Summary description of line type|
Planar structural point data showing bedding and foliation orientation (strike, dip, direction of dip);qualitative point data - fold axes line ornamentation.
Arc attribute table containing fold axes - monocline.
Faults: contains same information as sanbern_geo.aat. However, due to the complexity of regional fault distribution, we feel it is useful to include the faults in a separate coverage. Coverage contains (1) faults, (2) cartographic elements as (a) fault name annotation, (b) fault-plane dip values; (3) line ornamentation as point symbols.
Cartographic elements: geologic unit labels (anno.geo), leaders, locality information (anno.locality), names of major water bodies (anno.water_body).