The Geologic Map and Digital Database of the San Bernardino Wash 7.5 minute
quadrangle includes five double precision ARCINFO coverages: sbwash_geo (geology);
sbwash_flt (faults and structural line ornamentation); sbwash_dike (dikes);
sbw_structure, (structural point data); and sbwash_carto (cartographic elements,
geologic unit annotation and 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 sbwash_geo includes the following feature tables: (a) A polygon
attribute table (sbwash_geo.pat) that lists labels for the geological
characteristics and identifies plot labels for the rock units represented in the
Postscript (.ps) and Portable Document Format (.pdf) plotfiles of the geologic
maps; (b) Region subclass attribute tables that describe the geospatial
distribution of rock units represented in the Postscript (.ps) and Portable
Document Format (.pdf) plotfiles of the geologic maps (sbwash_geo.patrockunit), the
hierarchical array of stratigraphic parents of rock units in the crystalline
basement (sbwash_geo.patbasement1, sbwash_geo.patbasement2,
sbwash_geo.patbasement3, sbwash_geo.patbasement4), the hierarchical array of
stratigraphic parents of rock units in sedimentary and volcanic cover to the
basement rocks (sbwash_geo.patcover2), and the hierarchical array of stratigraphic
parents of surficial units (sbwash_geo.patsurficial1, sbwash_geo.patsurficial2,
sbwash_geo.patsurficial3, sbwash_geo.patsurficial4, sbwash_geo.patsurficial5).
This hierarchy of stratigraphic units can be related in ArcInfo, ArcMap or ArcView
to display or plot more generalized, derivative geologic maps than that represented
in Postscript (.ps) or Portable Document Format (.pdf) files.  (c) A region
subclass attribute table that describes surface units (veneers)
(sbwash_geo.patsurfunit). (d) A region subclass attribute table that shows those
areas where unit identification is uncertain (sbwash_geo.patident).  (e) An arc
attribute table (sbwash_geo.aat) that describes the contacts that bound rock-unit
polygons.
(2) The coverage sbwash_flt contains and displays the complete distribution of
fault features within the extent of the San Bernardino Wash quadrangle.  Structural
line ornamentation is included in this layer as point data.  Faults are
characterized in two route attribute tables (sbwash_flt.ratsegment and
sbwash_flt.ratfault).
(3) The coverage sbwash_dike includes an arc attribute table (sbwash_dike.aat) that
describes hypabyssal dikes. Dikes are planar intrusive features that intersect the
Earth's surface as linear features; they are represented as lines where their
surface widths are too narrow to be represented as areal features at a scale of
1:24,000.
(4) The coverages sbw_structure includes a point attribute tables
(sbw_structure.pat) that describe geologic structural point data, including the
types and orientation of bedding and foliation. An annotation subclass (anno.dip -
planar data) displays the dip values associated with each point datum.
(5) The coverage sbwash_carto includes both geologic unit symbol annotation and an
arc attribute table (sbwash_carto.aat) that displays annotation leaders.  Unit
symbols placed outside the perimeter of a particular polygon are identified by
annotation leaders.

http://pubs.usgs.gov/of/2002/0498/pdf/sbwash_pamph.pdf

Polygon attribute table that stores alphanumeric symbols for units that characterize lithologic type, surface veneer, landform, and age of earth materials represented by each polygon. In addition, the table stores coded stratigraphic unit symbols.

Geologic units contained in the database that are displayed on the geologic map in the Postscript (.ps) and Portable Document Format (.pdf) files

First-order stratigraphic parents of crystalline basement rock units

Second-order stratigraphic parents of crystalline basement rock units

Third-order stratigraphic parents of crystalline basement rock units

Fourth-order stratigraphic parents of crystalline basement rock units

First-order stratigraphic parents of surficial rock units

Second-order stratigraphic parents of surficial rock units

Third-order stratigraphic parents of surficial rock units

Fourth-order stratigraphic parents of surficial rock units

Fifth-order stratigraphic parents of surficial rock units

Second-order stratigraphic parents of cover rock units

Surface units (veneers)

Confidence in rock-unit identification

Geologic contacts, including fault contacts, that bound rock-unit polygons and map boundary

Faults

Fault segments: Arcs between or extending from fault intersections

Faults, fault strands, fault zones, fault systems, and fault groups

Dikes

Planar structural point data showing bedding and foliation orientation (strike, dip, direction of dip)

INFO table that summarizes name, age, origin, and lithology of rock units.

Data table that stores display criteria and data (rock unit colors/SHD, patterns/SHDFIL) to facilitate plotting of derivative maps. Symbolsets are: scamp2.shd (colors), geology2.shd (patterns).

Data (lookup) table that stores symbols that allow surface veneers to be represented as pattern overlays.

Annotation leaders and rock_unit labels derived from sbwash_geo.pat, plot_label