Geologic Map and Digital Database of the Apache Canyon 7.5' Quadrangle, Ventura and Kern Counties, California

The ARC/INFO version of the Digital Geologic Map of the Apache Canyon 7.5'quadrangle consists of seven coverages:
1) apache_geo - geology
Geologic units are delineated by geologic line entities and described by polygons which are attributed with the following set of attribute items in apache_geo.pat. For display purposes, the geology coverage contains a single annotation subclass: anno.geo contains unit labels.

APACHE_GEO.PAT:

COLUMN   ITEM NAME        WIDTH OUTPUT  TYPE N.DEC  ALTERNATE NAME
    1  AREA                   8    18     F      5
    9  PERIMETER              8    18     F      5
   17  APACHE_GEO#            4     5     B      -
   21  APACHE_GEO-ID          4     5     B      -
   25  LABL                  35    35     C      -
   60  PLABL                 35    35     C      -
   95  NAME                 200   200     C      -
  295  SHDPS                  3     3     I      -

LABL geologic map unit label, in plain text
Alphabetized list of map units symbols (LABL) and the corresponding map unit names (NAME) specified in the Apache Canyon geologic map database (apache_geo.pat):

Mzd		Diorite
Mzg		Granite
Pgn		Gneiss
Qam		Alluvium of modern stream channels
Qda		Debris-apron deposits
Qls		Landslide deposits, talus, and colluvium
Qoa		Old alluvium
Qt		Tuff(?)
QTm		Morales Formation
Qya		Young alluvium
Tac		Sandstone and conglomerate of lower Apache Canyon,
			conglomerate unit
Tap		Sedimentary breccia of Apache Potrero
Tas		Sandstone and conglomerate of lower Apache Canyon,
			sandstone unit
Tba		Basalt
Tbr		Sandstone of Blue Rock Spring
Tcl		Caliente Formation, lower part
Tcp		Sedimentary breccia and sandstone of Cowhead Potrero
Tcu		Caliente Formation, upper part, undivided
Tcu1		Caliente Formation, upper part, unit 1
Tcu2		Caliente Formation, upper part, unit 2
Tlc		Lockwood Clay
Tnc		Sandstone of Nettle Spring and upper part of Caliente
			Formation, undivided
Tns		Sandstone of Nettle Spring
Tq		Quatal Formation
Tql		Quatal Formation, lower part
Tsc		Sandstone and conglomerate
Tsh		Sandstone and shale, lower thin-bedded sandstone and
			shale unit
Tsi		Simmler(?) Formation
Tss		Sandstone and shale, upper sandstone unit
Tv		Vaqueros Formation

PLABL coded geologic map unit label used to generate plot labels with relevant stratigraphic symbols. The geologic units with LABL Mzd and Mzg (Mesozoic), and Pgn (Proterozoic) appear as }d, }g, and <gn respectively in the item PLABL. The replacement characters call their corresponding symbols from the Stratagem Font Group, currently publicly available at the following Web site http://pubs.usgs.gov/of/1999/of99-430/ Geologic map unit labels will plot on derivative map plots with appropriate stratigraphic symbols if PLABL is used as the source of unit labels.
NAME geologic name of each unit
SHDPS polygon color from shadeset scamp2.shd (included in the data package)
Geologic lines, which include features such as faults, contacts, and marker horizons are attributed with the following set of feature attribute items contained in apache_geo.aat. (A complete description of each line type is available in the data table, lines.rel.)

APACHE_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                 8    18     F      5
   25  APACHE_GEO#            4     5     B      -
   29  APACHE_GEO-ID          4     5     B      -
   33  L-TAG                 25    25     C      -
   58  L-SYMB                 3     3     I      -

L-TAG line tag which consists of a character and numerical value, e.g. C17, allows the user to relate the line entity to its corresponding definition in lines.rel
List of line types used in the Apache Canyon geologic map coverage (apache_geo.aat), including abbreviated descriptions from lines.rel:

C1	Contact, generic, observable, location meets map accuracy
		standard
C17	Contact, landslide, observable, location meets map
		accuracy standard
C19	Contact. landslide, inferrred, location may not meet map
		accuracy standard
C29	Contact, sedimentary, observable, location meets map
		accuracy standard
C30	Contact, sedimentary, observable, location may not meet
		map accuracy standard
C31	Contact, sedimentary, inferred, location may not meet map
		accuracy standard
C34	Contact, sedimentary, questionable, location may not meet
		map accuracy standard
C50	Contact, igneous, observable, location may not meet map
		accuracy standard
CL1	Cartographic line, map boundary
F1	Fault, high-angle, generic, observable, location meets
		map accuracy standard
F13	Fault, high angle, generic, inferred, location may not
		meet map accuracy standard
F177	Fault, low angle, thrust, location meets map accuracy standard
F180	Fault, low angle, thrust, location may not meet map accuracy
		standard
F19	Fault, high-angle, slip unspecified, inferred, location may
		not meet map accuracy standard
F22	Fault, high-angle, normal slip, covered, location may not
		meet map accuracy standard
F34	Fault, high-angle, normal slip, questionable, location may
		not meet map accuracy standard
F35	Fault, high-angle, reverse, questionable, location may not
		meet map accuracy standard
F4	Fault, high-angle, normal slip, certain, location meets
		map accuracy standard
F40	Fault, high-angle, normal fault, inferred, location may not
		meet map accuracy standard
F41	Fault, high-angle, reverse, questionable, location may not
		meet map accuracy standard
F5	Fault, high-angle, reverse, certain, location meets map
		accuracy standard
F73	Fault, low angle, slip unspecified, certain, location meets
		map accuracy standard
GF9	Ground-failure crown scarp, located well but may not meet
		map accuracy standard
MH11	Mapped marker horizon, located well but may not meet map
		accuracy standard

L-SYMB calls up the appropriate line symbol from the lineset geoscamp2.lin (included in the data package)
2) apache_str - structural lines
The attribute values, L-TAG and L-SYMB, link the line tag to the data table, lines.rel and call up the appropriate line symbol from the lineset geoscamp2.lin respectively.

APACHE_STR.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  APACHE_STR#            4     5     B      -
   29  APACHE_STR-ID          4     5     B      -
   33  L-TAG                 25    25     C      -
   58  L-SYMB                 3     3     I      -

List of line types used in the Apache Canyon structural map coverage (apache_str.aat), including abbreviated descriptions from lines.rel:

FA34	Fold axial trace, anticline, upright, observable, location
		may not meet map accuracy standard
FA35	Fold axial trace, anticline, upright, questionable, location
		may not meet map accuracy standard
FA36	Fold axial trace, anticline, upright, inferred beneath
		mapped covering unit, location may not meet map
		accuracy standard
FA50	Fold axial trace, anticline, overturned, observable, location
		may not meet map accuracy standard
FA51	Fold axial trace, anticline, overturned, inferred, location
		may not meet map accuracy standard
FA52	Fold axial trace, anticline, overturned, inferrerd beneath
		mapped covering unit, location may not meet map
		accuracy standard
FA98	Fold axial trace, syncline, upright, observable, location
		may not meet map accuracy standard
FA99	Fold axial trace, syncline, upright, inferred, location may
		not meet map accuracy standard
FA100	Fold axial trace, syncline, upright, inferred beneath mapped
		covering unit, location may not meet map accuracy
		standard

3) apache_pts - geological point data
Geological point data includes information describing the types and the orientation of bedding and foliation. One annotation subclass is included in the geologic points coverage: value displays the respective dip values associated with individual point data.

APACHE_PTS.PAT:

COLUMN   ITEM NAME        WIDTH OUTPUT  TYPE N.DEC  ALTERNATE NAME
    1  AREA                   8    18     F      5
    9  PERIMETER              8    18     F      5
   17  APACHE_PTS#            4     5     B      -
   21  APACHE_PTS-ID          4     5     B      -
   25  P-TAG                 25    25     C      -
   50  P-SYMB                 3     3     I      -
   53  P-DIP                  3     3     I      -
   56  P-STRIKE               3     3     I      -
   59  P-DIPDIR               3     3     I      -

P-TAG point tag which consists of a character(s) and numerical value, e.g. FN42, allows the user to relate the point entity to its corresponding definition in the data table, points.rel
P-SYMB calls the point-type from the markerset geoscamp2.mrk (included in the data package)
P-DIP the dip of planar features
P-STRIKE the azimuth strike of planar features
Point types (quantitative orientation data) in apache_pts.pat and their corresponding, abbreviated descriptions from points.rel:

B1	Bedding attitude, sedimentary, horizontal
B2	Bedding attitude, sedimentary, inclined
B4	Bedding attitude, sedimentary, vertical
B6	Bedding attitude, sedimentary, overturned
FC4	Fault dip direction
FN2	Foliation attitude, inclined
FN42	Foliation attitude, metamorphic, inclined

P-DIPDIR azimuthal direction of dip To date, there is no other way to indicate to the user the cardinal direction of dip using the traditional convention (traditional geologic notation allows a quadrant designation following the dip value).
4) apache_ptsorn - structural line ornamentation
The point data included in apache_ptsorn allow a visual representation of the type of structural linear feature, e.g. anticline and syncline symbols. The items P-TAG and P-SYMB link the point tag to its full description in points.rel and call up the appropriate point symbol from geoscamp2.mrk.

APACHE_PTSORN.PAT:

COLUMN   ITEM NAME        WIDTH OUTPUT  TYPE N.DEC  ALTERNATE NAME
    1  AREA                   8    18     F      5
    9  PERIMETER              8    18     F      5
   17  APACHE_PTSORN#         4     5     B      -
   21  APACHE_PTSORN-ID       4     5     B      -
   25  P-TAG                 25    25     C      -
   50  P-SYMB                 3     3     I      -

Point types (fold axes ornamentation) in ap_ptsorn.pat and their corresponding, abbreviated descriptions from points.rel:

FC1	Fault attribute, bar and ball on downdropped block
FAC4	Fold ornament, anticline, upright axial plane
FAC5	Fold ornament, anticline, overturned axial plane
FAC10	Fold ornament, syncline, upright axial plane

5) apache_sample - sample localities
A single sample locality, Tuff locality, is representd in ap_sample.

APACHE_SAMPLE.PAT:

COLUMN   ITEM NAME        WIDTH OUTPUT  TYPE N.DEC  ALTERNATE NAME
    1  AREA                   8    18     F      5
    9  PERIMETER              8    18     F      5
   17  APACHE_SAMPLE#         4     5     B      -
   21  APACHE_SAMPLE-ID       4     5     B      -
   25  LOCALITY              35    35     C      -
   60  P-SYMB                 3     3     I      -

6) apache_ldr - unit annotation leaders
Annotation leaders point to unit labels that are placed outside the perimeter of a particular geologic polygon. These cartographic line entities are attributed with only a single attribute, L-SYMB, and all have the same value, 1.

APACHE_LDR.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  APACHE_LDR#            4     5     B      -
   29  APACHE_LDR-ID          4     5     B      -
   33  L-SYMB                 3     3     I      -

7) apache_xs - cross-section lines
Three cross-section analyses are represented on the Apache Canyon quadrangle map plot by three lines contained in the coverage apache_xs. Their definitions are identical to those contained in apache_ldr. These cartographic line entities are similarly attributed with only a single attribute, L-SYMB, and all have the same value, 1. The cross-section lines AA', BB', and CC' are designated by annotation contained in the annotation subclass, xsection.

The data dictionary tables, lines.rel and points.rel each contain three items: L-TAG and P-TAG establish the links between the .aat, and the .pat to the respective data tables. The items L-DEF and P-DEF, respectively provide the coded definition for an entity. The items L-EXP and P-EXP provide a parsed explanation of the code contained in the corresponding -DEF items.