Electris deposits
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The Electris deposits are 100–200 m thick, light-toned sediments on Mars. They appear to be weak because few boulders are seen associated with them. The deposit mostly covers ground from 30° S to 45°
Layers in light-toned Electris deposit, as seen by HiRISE. Gullies are visible on the left.
Tharsis
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Tharsis is a vast volcanic plateau centered near the equator in the western hemisphere of Mars. The region is home to the largest volcanoes in the Solar System, including the three enormous shield vol
MOLA topography of the Thaumasia Plateau (Syria-Thaumasia block) and southern Tharsis. The volcano shown at the left is Arsia Mons. Valles Marineris extends across the northern edge. The areas in brown have the highest elevations on the Tharsis Plateau and may be considered the "summit region" of the Tharsis bulge.
Orographic water ice clouds hover over the volcanic peaks of the central Tharsis region in this color image mosaic from Mars Global Surveyor. Olympus Mons dominates at upper left. At center are the three Tharsis Montes: Arsia Mons at bottom, Pavonis Mons at center, and Ascraeus Mons at top.
Images of ice water clouds over Tharsis taken by the ExoMars Trace Gas Orbiter, 2016