Dark Splotch (Albedo Feature)
Reference work entry
Dark patches on the surface of Mars that can be elongated in wind direction.
A type of albedo feature on Mars
A type of dark deposit on Mars
Low albedo markings; Variable features (Sagan)
A dark irregular zone having a mottled appearance in images of Mars as seen with Mariner 9 resolution and low to moderate Viking resolution. Dark splotches are often associated with tongue-like streaks. They have a characteristic dimension between several to tens of km, are often found inside impact craters or “washed over crater walls,” and are controlled by topography (Sagan et al. 1972; Thomas 1984). Splotches are in fact fields (ergs) of dark dunes when observed at higher resolution ( dark deposits (Mars)). Their low albedo suggested that the sand is silica poor in composition. Dark splotches have been observed in topographical depressions: craters (crater splotches), troughs, and canyons (Thomas 1984). The Oxia Palus region was prominent for its...
- Greeley R, Iversen JD (eds) (1985) Wind as a geological process on Earth, Mars, Venus and Titan. Cambridge University Press, CambridgeGoogle Scholar
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