**Map key for digitizing of geologic maps\
for the National Surveys and Analysis project**

Shadeset = GEOLOGY.SHD\
Lineset = GEOLOGY.LIN

ARC lookup table = GEOLINE.LUT\
POLYGON lookup tables = NSAKEY.LUT, NSAKEYO.LUT,\
NSAKEYAL.LUT, NSAKEYHF.LUT

Coverage UTM zone Abbrev.

Anchorage 6 AN

Big Delta 6 BD

Circle 6 CI

Fairbanks 6 FB

Gulkana 6 GU

Healy 6 HE

Iditarod 4 ID

Kantishna River 5 KH

Kateel River 4 KT

Lime Hills 5 LH

Livengood 6 LG

McGrath 5 MG

Medfra 5 MD

Melozitna 5 MZ

Mount Hayes 6 MH

Mount McKinley 5 MM

Nulato 4 NL

Ophir 4 OP

Ruby 5 RB

Sleetmute 4 SM

Talkeetna 5 TL

Talkeetna Mountains 6 TK

Tanana 5 TN

Tyonek 5 TY

Valdez 6 VA

AAT Item structure for coverages (in addition to standard AAT items):

[Item name Alt.name Width Output Type]{.underline}

ARC-CODE 3 3 I\
ARC-PARA1 3 3 I\
ARC-PARA2 3 3 I\
SOURCE 6 8 C

In the table below, \"symbol code\" refers to the symbol number in the
symbol set \"geology.lin\", \"Arc code\" refers to the AAT item
\"ARC-CODE\", and \"Line code\" refers to the \"CODE\" in GSMAP.
ARC-CODE designates the line or arc type. The AAT item ARC-PARA1 is used
for \"decorated\" lines where additional information is needed (see
second table below. ARC-PARA2 is presently a \"scratch\" field for use
of the editor/digitizer. SOURCE is a coded reference citation,
indicating the manuscript or other source for the information. The
format for source is XX###, where XX it the two letter quadrangle code
(CAPITAL letters) and \### is a three digit number (uses leading zeros)
to indicate a specific reference.

0 0 Hidden lines

1 1 Stratigraphic contact, certain

6 2 Stratigraphic contact, approximate

11 3 Stratigraphic contact, inferred, queried

5 4 Normal fault, certain, digitized with upthrown side on the right
(code of 1 added to ARC-PARA1 where U/D is designated in source)

10 5 Normal fault, approximate, digitized with upthrown side on the
right (code of 1 added to ARC-PARA1 where U/D is designated in source)

15 6 Normal fault, inferred, queried, digitized with upthrown side on
the right (code of 1 added to ARC-PARA1 where U/D is designated in
source)

3 7 Shoreline or riverbank

0 9 Boundary of altered zone or hornfels

16 10 Thrust fault, certain, teeth on right from origin (angle of
thrusting added to ARC-PARA1 where designated in source)

19 11 Thrust fault, approx., teeth on right from origin (angle of
thrusting added to ARC-PARA1 where designated in source)

21 12 Thrust fault, inferred, queried, teeth on right from origin (angle
of thrusting added to ARC-PARA1 where designated in source)

7 13 Moraine or till margin (scour) on bedrock

35 14 Caldera or crater rim

37 15 Ice contact (glacier limit)

0 16 Thrust fault, having left lateral oblique slip (angle of thrusting
added to ARC-PARA1 where designated in source)

0 17 Thrust fault, having right lateral oblique slip (angle of thrusting
added to ARC-PARA1 where designated in source)

4 18 Internal contact

8 19 Internal contact having tics on right from origin

2 21 Syncline, certain, digitized in direction of plunge

12 22 Syncline, approx., digitized in direction of plunge

9 23 Syncline, inferred, queried, digitized in direction of plunge

2 24 Anticline, certain, digitized in direction of plunge

12 25 Anticline, approx., digitized in direction of plunge

9 26 Anticline, inferred, queried, digitized in direction of plunge

5 30 Fault, unknown offset, certain location

10 31 Fault, unknown offset, approximate location

15 32 Fault, unknown offset, inferred location

20 35 High-angle reverse fault, certain, teeth on right from origin
(angle of thrusting added to ARC-PARA1 where designated in source)

22 36 High-angle reverse fault, approximate location, teeth on right
from origin (angle of thrusting added to ARC-PARA1 where designated in
source)

23 37 High-angle reverse fault, inferred location, teeth on right from
origin (angle of thrusting added to ARC-PARA1 where designated in
source)

2 41 Syncline, overturned, certain, digitized in direction of plunge.

12 42 Syncline, overturned, approx., digitized in direction of plunge.

9 43 Syncline, overturned, inferred, queried, digitized in direction of
plunge.

2 44 Anticline, overturned, certain, digitized in direction of plunge.

12 45 Anticline, overturned, approx., digitized in direction of plunge.

9 46 Anticline, overturned, inferred, queried, digitized in direction of
plunge.

45 50 Dikes and sills, drawn in heavy red line.

51 51 Concealed contact

52 52 Concealed normal fault

53 53 Concealed thrust fault

54 54 Concealed high-angle reverse fault

52 55 Concealed normal fault, having right lateral oblique slip.

52 56 Concealed normal fault, having left lateral oblique slip.

52 57 Concealed right lateral fault

52 58 Concealed left lateral fault

2 61 Syncline, certain, no plunge.

12 62 Syncline, approx., no plunge.

9 63 Syncline, inferred, queried, no plunge.

2 64 Anticline, certain, no plunge.

12 65 Anticline, approx., no plunge.

9 66 Anticline, inferred, queried, no plunge.

5 71 Normal fault, certain, having right lateral oblique slip.

10 72 Normal fault, approx., having right lateral oblique slip.

5 73 Normal fault, certain, having left lateral oblique slip.

10 74 Normal fault, approx., having left lateral oblique slip.

15 75 Normal fault, inferred, queried, having left lateral oblique slip.

15 76 Normal fault, inferred, queried, having right lateral oblique
slip.

5 77 Fault, certain, having no known movement.

15 78 Fault, inferred, queried, having no known movement.

15 79 Fault, approx., having no known movement.

2 81 Syncline, overturned, certain, no plunge.

12 82 Syncline, overturned, approx., no plunge.

9 83 Syncline, overturned, inferred, queried, no plunge.

2 84 Anticline, overturned, certain, no plunge.

12 85 Anticline, overturned, approx., no plunge.

9 86 Anticline, overturned, inferred, queried, no plunge.

5 87 Right lateral fault, certain

10 88 Right lateral fault, approximate

15 89 Right lateral fault, inferred, queried.

5 90 Left lateral fault, certain.

10 91 Left lateral fault, approximate.

15 92 Left lateral fault, inferred, queried

93 93 Lineament

49 94 Shear zone, certain

\-- 95 Shear zone, approximate

\-- 96 Shear zone, inferred

0 99 Bounding line (neatline) of coverage\"

8 Black dashed line, using long dashes

60 Red solid line

61 Green solid line

62 Blue solid line

Presently defined uses of ARC-PARA1 are:

Thrust and high-angle reverse faults: Dip of fault plane where known,
negative number to indicate overturned

Normal faults: A code of \"1\" to indicate upthrown side is known and
indicated on the source

POLYGONS

PAT Item structure for coverages (in addition to standard PAT items):

[Item name Alt.name Width Output Type]{.underline}

CLASS NUMUNIT 4 5 B\
LITH1 4 5 B\
LITH2 4 5 B\
SOURCE 6 8 C\
NSACLASS NSA 4 5 B

In the table below, \"symbol code\" refers to the symbol number in the
symbol set \"geology.shd\" and \"Polygon code\" refers to the PAT item
\"NSACLASS.\" NSACLASS is used to indicate the geologic unit that the
polygon represents. LITH1 and LITH2 are to be used to indicate major and
minor lithologies contained in the polygon, however no polygons is these
coverages have been coded. SOURCE is a coded reference citation,
indicating the manuscript or other source for the information. The
format for source is XX###, where XX it the two letter quadrangle code
(CAPITAL letters) and \### is a three digit number (uses leading zeros)
to indicate a specific reference (see pamphlet).

The coding scheme for NSACLASS is shown in the file cakunits.htm and
applied in the supplied ARC lookup tables.