Physics – Geophysics
Scientific paper
May 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987pggp.rept..413b&link_type=abstract
In NASA, Washington, Reports of Planetary Geology and Geophysics Program, 1986 p 413-415 (SEE N87-23341 16-91)
Physics
Geophysics
Geochronology, Mars (Planet), Mars Craters, Mars Surface, Terrain Analysis, Mars Volcanoes, Photogeology, Photomapping, Planetary Evolution
Scientific paper
This study has provided a more detailed chronology than currently exists in the literature and has created some changes to the currently accepted geological evolutionary sequence of Mars. The period of heavy bombardment, although dominated by impact processes, experienced many forms of volcanic activity and at least one episode of intense fracturing. Most small volcanic constructs and the ridged plains regions are found to date from this early period, contrary to common belief. The fracturing and dissection of the highlands helps to provide further constraints on the timing of events such as the formation of the hemispheric dichotomy and the formation of the Tharsis Bulge. The northern plains are found to consist of a number of differently aged regions. The difference in age between the chaotic terrain and the outflow channels together with differences in the distribution curves among craters of various erosional states found on the channels support the theory of episodic periods of flooding.
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