Ancient lowlands on Mars

Details Ancient lowlands on Mars Ancient lowlands on Mars

May 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002georl..29j..22f&link_type=abstract

Geophysical Research Letters, Volume 29, Issue 10, pp. 22-1, CiteID 1384, DOI 10.1029/2001GL013832

Physics

71

Planetology: Solar System Objects: Mars, Planetary Sciences: Impact Phenomena (Includes Cratering), Planetary Sciences: General Or Miscellaneous

Scientific paper

Mars Orbiter Laser Altimeter (MOLA) data provide compelling evidence that the martian lowlands, below the smooth and sparsely cratered northern plains, are extremely old, far older than the plains which cover them. The evidence is in the form of a very large population of ``Quasi-Circular Depressions'' (QCDs), many of which are very evident in the MOLA elevation data but generally not visible in available imagery. We interpret these ``invisible'' QCDs to be buried impact basins. Cumulative number versus diameter curves for lowland QCDs suggests the buried lowland surface is older than the visible highland surface and that the lowland plains are a relatively thin (1-2 km) veneer overlying this much older surface. We conclude that the martian lowlands have been low and stable for nearly all of martian history.

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