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Advances in Mars' north polar stratigraphy and geomorphology

Monday, January 26, 2009
Kenneth L.
Tanaka (Astrogeology Team, U.S. Geological Survey)

Geologic mapping using CTX, THEMIS VIS, HiRISE, MOC, and MOLA data reveal a more complex north polar stratigraphy than previously appreciated. Aeolian erosion of the polar deposits associated with dune accumulation and migration sculpted polar layered deposits, particularly during a significant hiatus driven by high obliquity that may have terminated about 4-5 million years ago. Another hiatus occurred after deposition of basal deposits during the Early Amazonian (~1-3 billion years ago).

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