Groundwater‐controlled valley networks and the decline of surface runoff on early Mars

  title={Groundwater‐controlled valley networks and the decline of surface runoff on early Mars},
  author={Keith P. Harrison and Robert Grimm},
  journal={Journal of Geophysical Research},
[1] Fluvial erosion on early Mars was dominated by valley networks created through a combination of groundwater processes and surface runoff. A reduced greenhouse effect due to CO 2 loss, together with a declining geothermal heat flux, promoted the growth of a cryosphere and a Hesperian hydrologic regime dominated by outflow channel formation. We test the hypothesis that the transition from valley network to outflow channel formation was preceded by a more subtle evolution characterized by a… 

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