GEO 330 Study Guide - Midterm Guide: Sinuosity, Bedform, Mass Wasting
6 Apr 2018
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Thought to have formed by huge catastrophic floods. Age estimates for athabasca, grjota, and marte valles are 2-8, 10-40, and 35-140 my, respectively. Thought to have formed by slow erosion of running water. Ages of individual valleys are difficult to determine because they cover small areas and it is hard to count a statistically significant number of craters. At regional scales, the majority of valleys occur in noachian terrain. Some valleys also appear in hesperian terrain, and others that are in noachian terrain may actually be younger. Origin is somewhat controversial, but water likely played some role in their formation. Absence of craters on terminal deposits and cross-cutting relationships suggest young age. Similarities and differences between outflow channels, valleys, and gullies. One similarity could be that these geological features are all seen on mars and water is thought to have played a key role in their formation. Valleys are bigger and are formed from slow erosion of flowing water.
