The data is supplied in ARC/INFO export format.
DATABASE STRUCTURE - ARC/INFO ====================================
The database of the map consists of four coverages (root name =
sgm), including corresponding INFO files:
sgmpoly coverage: Contains all contact lines and labelpoints for
each polygon. In the coverage's sgmpoly.aat INFO file the CODE item
provides a numeric code that specifies the geologic identity and
positional quality of each contact line (e.g., fault, approximately
located), and the P1 and P2 items are relic cartographic parameters
from the GSMCAD compilation program. The sgmpoly.aat CODE values are
defined below. In the sgmpoly.pat INFO file the CODE and P2 items
are relic cartographic parameters from the GSMCAD program, the P1
item provides a numeric code that specifies the polygon's map unit
identity, the TEXT item indicates the map unit label for each
polygon, and the SYMBOL item defines the polygon color as chosen
from the color524.shd shadeset (included in bundled file archive).
The sgmpoly.pat P1 and TEXT items are listed below.
sgmline coverage: Contains faults, fold axis, and other non-contact
lines. Faults that are contacts also appear in the sgmpoly
coverage. In the sgmline.aat INFO file the CODE item provides a
numeric code that specifies the geologic identity and positional
quality for each type of line, the P1 and P2 items are relic
cartographic parameters from the GSMCAD program, and the TEXT item
describes the geologic identity, positional quality, and, in some
cases, additional aspects of each line. The sgmline.aat CODE and
TEXT items are listed below.
sgmpoint coverage: Contains points recording site-specific
observations and measurements, such as strike and dip of bedding. In
the sgmpoint.pat INFO file the CODE item provides a numeric code
that specifies the type of point observation, the P1 and P2 items
indicate the associated strike azimuth (or trend) and dip (or
plunge), respectively, and the TEXT item describes the type of point
observation. (In the case of bedding attiudes the P1 strike azimuths
are always 90 deg. counterclockwise from the associated dip
directions.) The sgmpoint.pat CODE and TEXT items are listed below.
sgmdec coverage: Contains points used for cartographically
decorating lines, such as "ball-and-bar" fault symbols, as well as a
repeat of points in the sgmpoint coverage recording site-specific
observations and measurements. Such point data provide additional
qualitative information mainly for line features representing faults
and folds, such as sense of fault displacement or fold type. In the
INFO file sgmdec.pat the CODE item defines a numeric code for each
type of point decoration and the P1 and P2 items indicate the
orientation (or strike azimuth) and, where appropriate, dip (or
plunge) value associated with each point symbol. The sgmdec.pat CODE
items are listed below.
Auxiliary files:
color524.shd: This shadeset file defines the rgb values of colors
assigned to polygons in the sgmpoly coverage (see SYMBOL item).
sgm24k.pdf: A file for viewing and printing a graphics version of
the map and accessory elements using Adobe Acrobat viewing software
(version 4.0).
Accessory map
elements displayed in this graphics file are: (1) geologic cross
section A-A", (2) geologic cross section B-B', (3) correlation of
map units diagram, (4) list of map unit symbols and names, and (5)
explanation of map symbols. sgmexpl.pdf: A detailed textual
description of geologic map units and a brief discussion of
deposits, structure, and geologic history of the map area. Can be
displayed using the Adobe Acrobat viewing software (version 4.0).
P1 | GEOLOGIC MAP UNIT LABELS
1 | Qa
2 | Qac
4 | Qma
5 | Qmac
11 | Qoa
12 | Qoac
13 | Qls
14 | Qols
15 | Qbd
18 | Tm
20 | Tqb
21 | Tqc
23 | Tlc
24 | Tc
25 | Tcau
26 | Tcv
28 | Tcl
29 | Tcg
30 | Tcc
32 | Tcal
33 | Tcp
36 | Tjs
37 | Tjsh
38 | Tjm
40 | Tjc
42 | Tps
43 | Tpl
44 | Tpb
47 | Tpbn
57 | Tcsh (sheared Tc)
58 | Tpsh (sheared Tp)
59 | Tma
60 | Tmam
61 | Tcd
62 | Tcds
63 | Qya
Definition of codes in the database coverages (codes and text listed in the .aat and .pat files)
code | text (definition)
1 | contact; certain
3 | contact; approximately located
4 | contact; inferred
8 | custom contact A
10 | fault; certain
11 | fault; concealed
13 | fault; approximately located
14 | fault; inferred
40 | thrust fault; certain; upthrown on right side
41 | thrust fault; concealed; upthrown on right side
44 | thrust fault; approximate location; upthrown on right side
45 | thrust fault; inferred; upthrown on right side
70 | anticline axis; certain
71 | anticline axis; concealed
72 | anticline axis; inferred
74 | syncline axis; certain
75 | syncline axis; concealed
76 | syncline axis; inferred
80 | dike
83 | marker bed A
86 | conglomeratic marker bed
92 | landslide scarp; slide block on right
94 | landslide scarp; slide block on right
97 | scratch boundary
98 | cross section profile line
99 | map boundary
201 | bedding attitude (P1=strike azimuth 90 deg.CCW from dip direction, P2=dip angle)
204 | anticline symbol (P1=orientation azimuth)
205 | syncline symbol (P1=orientation azimuth)
207 | ball & bar symbol (P1=orientation azimuth)
208 | fault attitude (P1=strike azimuth, P2=dip angle)
209 | left lateral symbol (P1=orientation azimuth)
210 | right lateral symbol (P1=orientation azimuth)
219 | OT bedding attitude (P1=strike azimuth 90 deg.CCW from dip direction, P2=dip angle)
220 | approximate bedding attitude (P1=strike azimuth 90 deg.CCW from dip direction, P2=dip angle)
227 | OT anticline symbol (P1=orientation azimuth)
228 | OT syncline symbol (P1=orientation azimuth)
241 | fold axis plunge symbol (P1=orientation azimuth)
268 | fault slickenside lineation (P1=trend, P2=plunge)
299 | bedding attitude from previous mapping (P1=strike azimuth 90 deg.CCW from dip direction, P2=dip angle)
362 | Flat bedding
376 | Drill hole
410 | Shear zone fill symbol
500 | Unit labels text & tag
501 | Hidden unit tags
502 | rock text
510 | ordinary text
701 | Splined text
