Networks of branching valleys on Mars

Details Networks of branching valleys on Mars Networks of branching valleys on Mars

Aug 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986phint..25...37b&link_type=abstract

Photo Interpretation (ISSN 0031-8523), vol. 25, July-Aug. 1986, p. 37-41, 43. In English, French, and Spanish.

Physics

Geomorphology, Mars Photographs, Mars Surface, Planetary Geology, Valleys, Climatology, Mariner 9 Space Probe, Planetary Structure, Viking Orbiter Spacecraft, Water

Scientific paper

An analysis of Viking Orbiter images of the Aeolis region of Mars reveals interconnected digitate networks of valleys dissecting extensive areas of heavily cratered uplands. Valley systems flow down a regional gradient of 0.5-1.0 m/km, making them capable of transporting material downgradient. High-density degraded networks probably formed during an early period of very heavy cratering and very active degradation by exogenetic geomorphic processes. Subsequent to the decline of the cratering rate and the cessation of active overland-flow processes, valleys continued to form by the influence of subsurface water. These latter valleys were nonetheless ancient, as indicated by the high density of superimposed impact craters.

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