Callisto Geologic Map Index
Steven Dutch, Natural and Applied Sciences, University
of Wisconsin - Green Bay
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Planetary geology doesn't get much simpler than Callisto, Jupiter's outermost Galilean satellite.
Two large multiple ring impact basins and the rest cratered plains with craters
in various states of degradation. For that reason there's no point in presenting
detailed maps. Only medium-scale maps are provided.
Numerous named craters are not shown separately on the geologic map. The naming convention on Callisto is
for features to be named from Norse mythology. Thus the two large impact basins
are Asgard and Valhalla. These features save Callisto from being almost as
uninteresting as Ceres.
Large Scale Maps (4 km/pixel)
90N 000EW North Pole
20N 100W Asgard and Valhalla
There is insufficient data to map the south pole
- Light yellow: Fresh craters with visible ejecta or rays
- Dark Yellow: Moderately degraded craters
- Orange: Highly degraded craters
Major Multiple Ring Impact Basins
- Magenta: Valhalla Inner Facies
- Light Purple: Valhalla Outer Facies
- Medium Blue: Asgard Inner Facies
- Light purple: Asgard Outer Facies
- Brown: Cratered plains. Makes up most of Callisto's surface. Very
dark, with albedo less than 20 per cent. Ancient cratered crust. Many old surfaces in the outer solar system are dark,
one possibility is that solar ultraviolet and cosmic rayes break up organic molecules, liberating carbon.
- Dark Green: Light plains: Patches of lighter terrain. Probably the
last stage of degradation of craters.
- Light Green: Smooth plains: Probable impact melt (water) now frozen.
Structural features are shown as follows:
- Crater Rims have hachures on the inner side.
- Dorsa (compressional ridges) are black lines with solid black
- Fossae and grabens are black lines with X's.
- Catenae (crater chains) are lines with open circles.
Notes and References
Global Geology Index
Professor Dutch's Home Page
Created 27 January 2015, Last Update
19 June 2017
Not an official UW Green Bay site