Physics – Geophysics
Scientific paper
Jun 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991pggp.rept..123s&link_type=abstract
In NASA, Washington, Reports of Planetary Geology and Geophysics Program, 1990 p 123-124 (SEE N92-10728 01-91)
Physics
Geophysics
Chronology, Glaciers, Hydrology Models, Land Ice, Mars Craters, Mars Surface, Stratigraphy, Cratering, Diameters, Ejecta, Mars (Planet), Oceans, Planetary Evolution, Size Distribution, Slopes
Scientific paper
A hydrological model involving episodic oceans and ice sheets on Mars has been presented by Baker, et al. One of the main uncertainties concerning this model is the age and correlation of these events. Even more uncertain are their absolute ages. However, based on stratigraphic and cratering evidence, the most recent occurrence of these events was relatively late in Martian history. The cratering record on Mars can be divided into three general periods: (1) the period of late heavy bombardment; (2) a transition period at the end of late heavy bombardment; and (3) the post heavy bombardment era. The crater size/frequency distribution represented by the period of late heavy bombardment is characterized by a complex curve with a differential-2 slope (cumulative-1) at diameters less than about 50 km diameter, while the post heavy bombardment size distribution has a differential-3 slope (cumulative-2) over the same diameter range. An R plot is presented of the size/freqency distribution of ejecta blanket craters on the Argyre esker plains and similar craters in Hellas. The relative chronology is summarized of oceans, ice sheets, and other major events in Martian history.
Johnson Natasha
Kargel Jeffrey S.
Knight Christine
Strom Robert G.
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