Fill and spill of giant lakes in the eastern Valles Marineris region of Mars
Nicholas H. Warner et al., Jet Propulsion Laboratory, 4800 Oak Grove Drive, Pasadena, California 91109, USA. Posted online ahead of print on 29 April 2013; http://dx.doi.org/10.1130/G34172.1.
The occurrence of Hesperian age (3.7.4 billion years old) standing bodies of water at the surface of Mars is a contentious issue, often conflicting with favored climate models. Extensive lakes are proposed to have filled parts of Valles Marineris during this period, yet evidence for their presence and temporal continuity is poorly constrained. In this study, Nicholas Warner and colleagues test the lake hypothesis within eastern Valles Marineris using a new suite of high-resolution imagery and topography data. They analyze the complex geomorphologic and chronologic relationships between structurally controlled, chaotic terrain basins and their associated catastrophic outﬂow channels. The study results demonstrate that the outﬂow channels and interbasin chasmata exhibit evidence for signiﬁcant bedrock erosion by catastrophic spillover from preexisting, kilometer-deep bodies o
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Geological Society of America