Federal Geographic Data Committee U.S. Geological Survey Open-File Report 99–430 Public Review Draft - Digital Cartographic Standard for Geologic Map Symbolization PostScript Implementation (filename: of99-430_22-01.eps) 22—PLATE-TECTONIC FEATURES [Symbols for plate-tectonic features are usually reserved for maps at scales of 1:500,000 or smaller]

REF NO DESCRIPTION SYMBOL CARTOGRAPHIC SPECIFICATIONS NOTES ON USAGE ° color 100% red 60 lineweight .375 mm Sawteeth point in direc- Active spreading axis or mid-oceanic ridge, with 22.1 1.25 spacing tion of spreading. rift—Certain mm may vary sawtooth lineweight .25 mm; spacing 12.5 mm May also be shown in black or other colors. Active spreading axis or mid-oceanic ridge, with 22.2 rift—Approximately located 10.0 mm H-8 ? Active spreading axis or mid-oceanic ridge, with 2.5 mm 22.3 rift—Approximately located, queried ?

60° lineweight .625 mm Sawteeth point in direc- Active spreading axis or mid-oceanic ridge, 1.25 color 22.4 mm tion of spreading. without rift—Certain 100% red sawtooth lineweight .25 mm; spacing 12.5 mm May also be shown in black or other colors. 22.5 Active spreading axis or mid-oceanic ridge, without rift—Approximately located 10.0 mm H-8 ? Active spreading axis or mid-oceanic ridge, 2.5 mm 22.6 without rift—Approximately located, queried ?

60° all lineweights .25 mm 1.25 Sawteeth point in direc- 22.7 Ancient spreading axis or mid-oceanic ridge— mm tion of spreading. Certain .75 mm sawtooth spacing 12.5 mm 10.0 mm 22.8 Ancient spreading axis or mid-oceanic ridge— Uncertain 2.5 mm color 100% red 6.25 sawtooth radius Sawteeth on upper Surface trace of active deep-seismofocal or mm 3.0 mm 22.9 1.25 plate. subduction zone—Certain mm lineweight .375 mm May also be shown in black or other colors. Surface trace of active deep-seismofocal or 22.10 5.25 subduction zone—Approximately located mm H-8 ? ? Surface trace of active deep-seismofocal or 22.11 subduction zone—Approximately located, ? ? 1.0 mm queried pattern 427-R 22.12 Surface trace of active deep-seismofocal or subduction zone—Showing fore-arc sediments

color 6.25 Sawteeth on upper 100% red mm 22.13 2.0 Active convergent plate boundary—Certain mm plate. lineweight .375 mm May also be shown in black or other colors. Active convergent plate boundary—Approximately 22.14 5.0 located mm H-8 ? ? Active convergent plate boundary—Approximately 22.15 ? 1.25 mm located, queried ?

pattern 429-R 22.16 Active convergent plate boundary—Showing accretionary prism

6.25 Sawteeth on upper mm 22.17 Ancient convergent plate boundary—Certain 1.75 mm plate. lineweight .25 mm 5.0 H-8 mm 22.18 Ancient convergent plate boundary— Approximately located 1.25 mm lineweight 6.25 Teeth point toward 22.19 Continental slope—Certain .25 mm mm slope. tooth height .875 mm; width 1.5 mm

22.20 Continental slope—Approximately located 5.25 mm H-8 ? ? Continental slope—Approximately located, 22.21 ? ? 1.0 mm queried

pattern 119-K 22.22 Continental slope—Showing margin

A–22–1 Federal Geographic Data Committee U.S. Geological Survey Open-File Report 99–430 Public Review Draft - Digital Cartographic Standard for Geologic Map Symbolization PostScript Implementation (filename: of99-430_22-02.eps) 22—PLATE-TECTONIC FEATURES (continued) [Symbols for plate-tectonic features are usually reserved for maps at scales of 1:500,000 or smaller]

REF NO DESCRIPTION SYMBOL CARTOGRAPHIC SPECIFICATIONS NOTES ON USAGE May be shown in other Active transform fault, sense of offset lineweight .375 mm 22.23 colors. unspecified—Certain color 100% red May also be shown in black, but the distinction Active transform fault, sense of offset between "active" and 22.24 3.5 mm unspecified—Approximately located H-8 "ancient" transform ? ? faults will be lost.

22.25 Active transform fault, sense of offset 1.0 mm unspecified—Approximately located, queried ? ?

lineweight 1.75 mm Arrows show direction .375 mm 25° arrow 22.26 Active transform fault, right-lateral offset—Certain lineweight of relative offset. color .3 mm 100% red 5.0 mm May be shown in other colors. Active transform fault, right-lateral offset— 22.27 3.5 mm May also be shown in Approximately located H-8 black, but the distinction ? ? between "active" and Active transform fault, right-lateral offset— "ancient" transform 22.28 ?? 1.0 mm Approximately located, queried faults will be lost.

lineweight 1.75 mm Arrows show direction .375 mm 25° arrow 22.29 Active transform fault, left-lateral offset—Certain lineweight of relative offset. color .3 mm 100% red 5.0 mm May be shown in other colors. Active transform fault, left-lateral offset— 22.30 3.5 mm May also be shown in Approximately located H-8 black, but the distinction ? ? between "active" and Active transform fault, left-lateral offset— "ancient" transform 22.31 ? ? 1.0 mm Approximately located, queried faults will be lost.

color lineweight .375 mm 100% red Hachures on down- 22.32 Active transform fault, normal offset—Certain thrown side. hachure lineweight .175 mm; height 1.0 mm; spacing .375 mm May be shown in other colors. 22.33 Active transform fault, normal offset— May also be shown in 3.5 mm Approximately located H-8 black, but the distinction ?? between "active" and Active transform fault, normal offset— "ancient" transform 22.34 ?? 1.0 mm Approximately located, queried faults will be lost.

lineweight .375 mm 22.35 Ancient transform fault, sense of offset unspecified—Certain

3.5 mm Ancient transform fault, sense of offset 22.36 unspecified—Approximately located 1.0 mm Sawteeth point into ba- 90° sawtooth 22.37 Outline of basin—Certain all lineweights height .6 mm; sin. .2 mm spacing 6.25 mm

dash 5.25 mm; 22.38 Outline of basin—Approximately located space 1.0 mm ? H-8 ? ? ? 22.39 Outline of basin—Approximately located, queried ? ? lineweight .2 mm 22.40 Deep-sea trench—Showing margin filled by sedimentation pattern 119-K

4.5 .625 mm mm Hachures point down- 22.41 Margin of oceanic rise—Certain hachure height slope. all lineweights 1.0 mm .175 mm

22.42 Margin of oceanic rise—Approximately located H-8 ? ? ? Margin of oceanic rise—Approximately located, ? ? 22.43 dash 4.125 mm; queried ? space 1.0 mm

A–22–2 Federal Geographic Data Committee U.S. Geological Survey Open-File Report 99–430 Public Review Draft - Digital Cartographic Standard for Geologic Map Symbolization PostScript Implementation (filename: of99-430_22-03.eps) 22—PLATE-TECTONIC FEATURES (continued) [Symbols for plate-tectonic features are usually reserved for maps at scales of 1:500,000 or smaller]

REF NO DESCRIPTION SYMBOL CARTOGRAPHIC SPECIFICATIONS NOTES ON USAGE all lineweights hachure height Hachures point down- .2 mm .625 mm; 22.44 Volcanic ridge or edifice—Certain spacing slope. 2.25 mm

22.45 Volcanic ridge or edifice—Approximately located ? ? H-8

? ? ? ? 22.46 Volcanic ridge or edifice—Approximately located, queried dash 3.5 mm; ? ? space 1.0 mm all lineweights Hachures point down- .2 mm 22.47 Guyot slope. hachure height .625 mm; spacing .5 mm all lineweights .2 mm sawtooth height Sawteeth point down- 1.0 mm; spacing 22.48 Seamount, nonvolcanic origin 5.0 mm slope. 60° lineweight .2 mm sawtooth height 22.49 1.0 mm; spacing Seamount, volcanic origin 5.0 mm 60°

all lineweights .9375 mm Hachures point down- .15 mm 22.50 Seamount, nonvolcanic origin (shown as point slope. symbol when too small to outline at map scale) circle diameter 1.375 mm 3.25 mm lineweight .15 mm 22.51 Seamount, volcanic origin (shown as point symbol when too small to outline at map scale) dot diameter 1.375 mm

A–22–3