18. Evidence for Hydrologic
System
Evidence is abundant for a significant hydrologic system in the pa
• Drainage networks
• Headward erosion
• Springs
• Concretions
• Karst
• Braided and meandering fluvial systems
• Cross-bedding
• Alluvial fans
• Deltas
• Eolian dunes
• Glaciers
• Patterned ground
• Mass wasting
• Ocean basins
• Oxidized sediment
36. Eolian Systems
The Martian atmosphere is thin but very active, resulting in welldeveloped eolian systems, including barchan, barchanoid,
transverse, longitudinal, and star forms.