GEO 330 Lecture Notes - Lecture 10: Aquifer, Valles Marineris, Gravity Current
6 Mar 2018
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Document Summary
They could be formed by water erosion, glaciation, faulting, mass wasting, volcanism, or a combination of these processes. It refers to the conduit within which a stream is confined. On mars, three types of linear, incised, and likely water-eroded features are distinguished: 10s to 100s of km across and most contain streamlined remnants of pre-existing terrain. Most start full size and have no tributaries. Thought to have formed by huge catastrophic floods. Narrower than outflow channels, with individual valleys usually being 1-5km across. Can be 100s or 1000s of km in length. Thought to have formed by slow erosion of running water. Smaller than both valley networks and outflow channels. Only found on steep slopes, and are 10s of meters wide and 100s of meters long. Origin is somewhat controversial, but water likely played some role in their formation. Teardrop islands and scour features in ares vallis. Teardrop shaped islands are common in most outflow channels.
