13 Feb 2008

 
Dunes with Unusual Gully

Seen here is the eastern edge of a dune !eld in a large, degraded crater in the southern
hemisphere. Similar to other dunes on Mars, these dunes are dark-toned and contain
gullies. Gullies are features found on slopes and dunes in the mid-latitudes of both
hemispheres. Both slope and dune gullies were once initially suggested to be a result
of liquid water from the surface or subsurface.

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Gullies, Arcuate Ridges, and Scalloped Terrain in Acidalia Planitia

This image covers the eastern part of an unnamed crater located in the northern lowlands,
showing features such as gullies, arcuate (bow-like) ridges, and scalloped terrain,
that may indicate the presence of ice-rich materials near the surface. This observation is
in agreement with theories proposing that some Martian gullies could form by melting
of an ice rich-mantle deposited under different climatic conditions.

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Inverted Channels North of Juventae Chasma

This image shows raised ridges on a plain to the north of Juventae Chasma, a canyon
that is part of the Valles Marineris system. Several examples of raised features have
been identi!ed on the plains nearby; they have been explained as former stream
channels that are now preserved in inverted relief. On Earth, inverted relief occurs
when former depressions become elevated because materials that !ll the depressions
are more resistant to erosion than the surrounding terrain.

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Layers on Floor of Trough in Noctis Labyrinthis

Layering is visible along the !oor of a trough in Noctis Labyrinthis. The troughs in this
area appear to be collapse pits and faults that extend across western Valles Marineris,
the largest canyon system in the Solar System. Upwelling of the Tharsis Plateau causing
extension in this region, and along with water drainage may explain the trough formation.

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Light-toned Layers in Eos Chaos

This image shows an outcrop of light-toned rock in Eos Chaos, a knobby region which
transitions into the Eos Chasma. The outcrop is exposed in the wall of a mesa (a !attopped,
steep-sided plateau). The outcrop is prominent in the eastern part of the image.
Most of the material is light and shows many small scarps or benches. In places
these appear to indicate boundaries between layers, but they are often discontinuous.

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Proposed MSL site in Nili Fossae Trough
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