Geologic map of the Fawnskin 7.5' quadrangle, San Bernardino County, California

Online link https://geo-nsdi.er.usgs.gov/metadata/open-file/98-579/metadata.faq.html
Description This data set maps and describes the geology of the Fawnskin 7.5' quadrangle, San Bernardino County, California and contains original U.S. Geological Survey data generated by detailed field observation and by interpretation of aerial photographs. The geo
Originators Miller, Fred K.; Matti, Jonathan C.; Brown, Howard J.; and Powell, Robert E.
Publication U.S. Geological Survey Open-File Report 98-579

Related topics

States or counties

Overview of attributes

The digital geologic map of the Fawnskin 7.5' quadrangle includes five geospatial datasets
as double precision ARC/INFO coverages: fskn_geo (geology), fskn_pts (structural point
data), fskn_str (structural line data), fskn_orn (line ornamentation) and fskn_ldr
(annotation leaders).  Geospatial entities in ARC/INFO coverages have the following
software-defined attributes: <cover>.pat contains AREA, PERIMETER, cover#, and cover-ID;
<cover>.aat contains FNODE#, TNODE#, LPOLY#, RPOLY#, LENGTH, cover#, and cover-ID.
User-defined attributes are described in detail below.
(1) The coverage fskn_geo includes a polygon feature attribute table (fskn_geo.pat) that
describes the geospatial distribution of rock units represented in the Postscript (.ps)
and Portable Document Format (.pdf) plotfiles of the geologic maps and an arc feature
attribute table (fskn_geo.aat) that describes the contacts and faults that bound rock-unit
polygons.  Line and point identity data are recorded in the .aat and .pat using a system
of identity codes.  Two INFO tables, lines.rel and points.rel, provide a full description
of each of the geological line and point codes in the database.  For display purposes in
the .ps and .pdf geologic maps, the geology coverage includes two annotation subclasses:
anno.geo, which contains unit labels derived from the coded item PLABL, and anno.fault,
which contains formal fault names.  In addition, the item TAG allows the user to access
(relate to) a series of INFO data tables that contain additional, detailed, coded geologic
data. A complete description of the polygon, line, and point data coding schemes is
available in U.S.  Geological Survey Open-File Reports 97-859, OFR 97-860, and OFR 97-861
(full source citations follow).
Six INFO data tables are included in the Fawnskin database: fawnskin_summary.rel provides
general information attribute data, fawnskin_genesis.rel provides data summarizing the
genesis of each of the major rock types that occur within a particular map rock unit,
fawnskin_lithology.rel contains lithologic attributes for the main and secondary
lithologic types in the geologic-map unit, fawnskin_paleontology.rel contains attributes
that summarize information about fossil type occurrences in each of the rock types,
fawnskin_protolith.rel describes rock type protoliths, and fawnskin_structure.rel contains
geologic structural data.  The tables have identical architecture other than
fawnskin_summary.rel.  The item TAG serves as the relate item and there are five
additional feature attribute items, LITH1...LITH5, that represent the major rock types
within a rock unit.  Fawnskin_summary.rel contains seven items: TAG (the relate item), AGE
(unit age), AGECON (the confidence with which a geologic age is assigned to a map unit),
SURFACE (geologic and geomorphic properties that characterize the upper surface of
surficial geologic units), TYPE (hierarchical classification of the specific lithologic
types occurring in the map unit), CLASS (stratigraphic classification of a rock unit per
the North American Code of Stratigraphic Nomenclature), and ORIGIN (geologic origin of
each map unit).
(2) The coverage fskn_pts includes a point attribute table (fskn_pts.pat) that describes
both the types and orientation of bedding, foliation, and lineation.  An annotation
subclass displays the dip or plunge values associated with the point data.
(3) The coverage fskn_str includes an arc attribute table (fskn_str.aat) that describes
linear, geologic structural data.
(4) The coverage fskn_orn includes a point attribute table (fskn_orn.pat) that describes
structural line ornamentation.
(5) The coverage fskn_ldr includes an arc attribute table (fskn_ldr.pat) that describes
annotation leaders.  Unit symbols that are placed outside the perimeter of a particular
polygon identify that polygon with annotation leaders.

A complete description of the polygon, line, and point data coding schemes is available in the following U.S. Geological Survey Open-File Reports: Matti, J.C., Miller, F.K., Powell, R.E., Kennedy, S.A., Bunyapanasarn, T.P., Koukladas, Catherine, Hauser, R.M., and Cossette, P.M., 1997b, Geologic-point attributes for digital geologic-map databases produced by the Southern California Areal Mapping Project (SCAMP), Version 1.0: U.S.Geological Survey Open-File Report 97-859 Matti, J.C., Miller, F.K., Powell, R.E., Kennedy, S.A., and Cossette, P.M., 1997c, Geologic-polygon attributes for digital geologic-map databases produced by the Southern California Areal Mapping Project (SCAMP), Version 1.0: U.S.Geological Survey Open-File Report 97-860 Matti, J.C., Powell, R.E., Miller, F.K., Kennedy, S.A., Ruppert, K.R., Morton, G.L., and Cossette, P.M., 1997a, Geologic-line attributes for digital geologic-map databases produced by the Southern California Areal Mapping Project (SCAMP), Version 1.0: U.S.Geological Survey Open-File Report 97-861

FSKN_GEO.PAT

Geologic map units

Label Definition
LABL Geologic map unit label. Plain text is substituted for conventional geologic age symbols (C for Cambrian, Mz for Mesozoic, Tr for Triassic, P for Pennsylvanian, and Pr for Proterozoic) and unit label subscripts as annotated on map
SHDFIL Coded integer value that relates polygon to fill pattern in shadeset, geology2.shd.
PLABL Coded geologic map unit label used to generate plot label.
NAME Geologic name of map unit (see list under LABL attribute).
TAG A reference label for subgroups of polygons of the geologic-map unit identified by LABL. Each polygon subgroup has certain attributes in common with all other polygons of the map unit. However, each subgroup may have unique, distinguishing attributes which warrant recognition in the database although those distinguishing characteristics do not warrant recognition as new map units. TAG is defined as LABL followed by an upper-case letter, e.g., QwA, QwB, or QwC, etc. There are many units in the Fawnskin quadrangle that have sufficiently distinctive properties that are identified with TAG other than the dafault A designation. TAG serves one additional purpose: it functions as the relate item that associates each polygon with its attributes stored in the six polygon-attribute data tables identified in the Entity_and_Attribute_Overview section above.
SHDPS Polygon color from shadeset scamp2.shd (included in the data package) and used to generate the map plotfile.
POLYCON Coded statement of confidence with which the unit assignment was made (See Entity_and_Attribute_Detail_Citation section).

FSKN_GEO.AAT

Geologic contacts and faults that bound rock-unit polygons.

Label Definition
L-SYMB Coded integer symbol that relates arc to cartographic line symbol in lineset, geoscamp2.lin.
L-TAG Coded alpha-numerical symbol that relates arc to definition of line type in dictionary, lines.rel. For description of attributes in line classification dictionary, refer to USGS Open-File Report 97-861 (see Entity_and_Attribute_Detail_Citation)
L-NAME Formal name of linear geologic feature.

FSKN_PTS.PAT

Structural point data.

Label Definition
P-DIP Dip of planar feature.
P-STRIKE Azimuthal strike of planar feature.
P-SYMB Coded integer symbol that relates point to cartographic point symbol in markerset, geoscamp2.mrk.
P-TAG Coded alpha-numerical symbol that relates point to definition of point type in dictionary look-up table (points.rel). For description of attributes in point classification dictionary, refer to USGS Open-File Report 97-859 (see Entity_and_Attribute_Detail_Citation).
P-DIPDIR Azimuthal direction of dip of planar feature.
P-PLUNGE Plunge of linear feature.
P-BEARING Azimuthal direction of plunge of linear feature.

FSKN_STR.AAT

Linear, structural features e.g. fold axes.

Label Definition
L-SYMB Stores appropriate line symbol value from the lineset geoscamp2.lin.
L-TAG Coded alpha-numerical symbol that relates arc to definition of line type in dictionary, lines.rel. For description of attributes in line classification dictionary, refer to USGS Open-File Report 97-861 (see Entity_and_Attribute_Detail_Citation).

FSKN_ORN.PAT

Line ornamentation.

Label Definition
P-SYMB Coded integer symbol that relates point to cartographic point symbol in markerset, geoscamp2.mrk.
P-TAG Coded alpha-numerical symbol that relates point to definition of point type in dictionary INFO table, points.rel. For description of attributes in point classification dictionary, refer to USGS Open-File Report 97-859 (see Entity_and_Attribute_Detail_Citation).

FSKN_LDR.AAT

Annotation leaders.

Label Definition
L-SYMB Coded integer symbol, value 1, that relates arcs to cartographic line symbol in lineset, geoscamp2.lin.