| Selected Planetary Geology Features
| Specifications
|
| Contact
| Dashed where approximately located, short dashed where infered, dotted where concealed
| Weight 0.005 Long dash 0.15 Short dash 0.06
| Dot length 0.020 Space 0.020
|
| Fault
| Ball and bar on downthrown side, arrows show relative direction of movement, dashed where approximately located, short dashed where inferred, dotted where concealed
| Weight 0.015 Long dash 0.015 Short dash 0.060 Dot .020
| Space 0.020 Ball diameter 0.035 Stem weight 0.006 Ball-Stem height 0.075
|
| Graben
| (shown by a single line where bounding faults cannot be mapped separately
| Weight 0.015
| Large ball diameter 0.055
|
| Thrust fault or ramp
| Sawteeth on upper plate
| Base weight 0.015 Triangle height 0.06
| Triangle spacing 0.20 Angle at top 65°
|
| Lineament
| | Weight 0.012 Space 0.020
| Dash 0.060
|
| Joint or fracture pattern
| | Weight 0.008
| |
| Ridge crest, type 1
| (May be shown in red, if necessary)
| Weight 0.010 Angles-Top & bottom 65°
| Height of diamond 0.12
|
| Ridge crest, type 2
| | Weight of diamond 0.010
| |
| Long ridge crest
| Abrupt termination shown at point of arrow or gradual termination
| Weight 0.010 Arrow length 0.055
| Tick height 0.070 Arrow angle 65°
|
| Scarp base
| Barbs point downslope
| Weight 0.010 Angle at bottom 65°
| Triangle height 0.06
|
| Scarp top
| Hachures point downslope
| Weight 0.010 Tick weight 0.008
| Tick height 0.04 Tick space 0.20
|
| Lobate scarp
| Hachures at top of scarp point downslope
| Weight 0.010 Tick weight 0.008
| Tick height 0.04 Tick space 0.08
|
| Basal scarp
| Hachures at top of scarp point downslope
| Weight 0.010 Tick weight 0.008
| Tick height 0.05 Tick space 0.12
|
| Dome or circular scarp
| Hachures point downslope
| Weight of outline 0.010 Tick weight 0.008
| Tick height 0.035 Tick space 0.05
|
| Depression
| | Weight of outline 0.010 Tick weight 0.008
| Tick height 0.035 Tick space 0.14
|
| Trough or narrow depression
| | Weight 0.010 Base and top angles 65°
| Triangle height 0.06
|
| Shallow linear depression, narrow valley, or channel
| (Normally shown in blue)
| Weight 0.010 Space 0.015
| Dot 0.015
|
| Furrow
| | Weight 0.010
| Sides of square 0.07
|
| Sharp groove
| (May be shown in red, if necessary)
| Weight 0.010 Tick spacing 0.055
| Tick height 0.070
|
| Subdued groove
| | Weight 0.010
| Tick height 0.070
|
| Reticulate grooves
| Showing trend (USGS pattern 327)
| Weight 0.006 Diagonal spacing 0.120
| Crossbar length 0.045
|
| Crater rim
| Showing crest
| Weight of outline 0.010 Tick height 0.030
| Tick weight 0.008 Tick spacing 0.015
|
| Buried crater rim
| Showing crest
| Weight of outline 0.010 Dash length 0.16
| Dot diameter 0.012 Space 0.015
|
| Crater
| Showing central peak (Use + if too small to map outline)
| Weight 0.008 Crossbar length 0.095
| Bar length 0.060
|
| Crater floor
| Showing pit. Circle outlines rim (Use dot if crater too small to map rim)
| Open circle weight 0.008
| Solid circle diameter 0.035
|
| Palimpsest ring
| | Solid circle diameter 0.035
| Space 0.015
|
| Ejecta
| Light-colored (USGS pattern 122)
| USGS 122
| |
| Ejecta
| Dark-colored (Format pattern 7085; may be shown in magenta if necessary)
| Format 7085
| |
| Chain craters or collapsed lava tube
| | Weight 0.006
| |
| Impact crater
| Having a raised rim and a visible ejecta blanket
| Weight of outline of ejecta blanket 0.005
| (Weight of outline of crater rim 0.010)
|
| Impact crater
| Peak at center of mound surrounded by floor, rim crest (hachured), and rough rim ejecta, continuous ejecta, or a field of secondary craters
| Weight of outlines 0.005
| (Weight of outline of rim crest 0.010)
|
| Caldera
| | Weight of outline 0.010 Tick height 0.025
| Tick weight 0.008 Space 0.035
|
| Volcano
| Queried if origin is conjectural (Show color within if appropriate)
| Weight of outline 0.005
| Universe 8-pt
|
| Volcano
| Having a summit crater (Show color within if appropriate)
| Weight of outline 0.005
| (Weight of outline of summit crater 0.010)
|
| Flow front
| Arrow indicates flow direction
| Weight 0.010 Stem weight 0.006 Angle of arrow tip 40°
| Arrow height 0.055 Stem height 0.045
|
| Mountain (rugged)
| Origin uncertain
| Weight 0.005
| Screen 50%
|
| Channel bars
| (May be erosional or depositional)
| Weight 0.005
| Screen 30%
|
| Slide (slump) material
| Arrow indicates direction of movement
| Weight of outline 0.010 Stem height 0.10 Arrow side 0.07
| Stem weight 0.008 Angle of arrow tip 60°
|
| Layering in canyon wall
| | Weight 0.005
| Lengths will vary
|
