The Scars of MarsIt is to be noted that all 15 of the largest craters of Mars are in the Hemisphere of Craters. It is also noteworthy that the massive lava outflows of Argyre, Hellas, and Isidis undoubtedly have spread and occluded a certain significant number of craters Thus our figure of 3068 craters 20 miles and larger in diameter has been masked by these lava outflows; the original figure was even larger before lava flow and before larger craters occluded some smaller ones.
by Donald W. Patten
January 1991
If there is a shift from our Table III, therefore, it will probably be in the direction of an even greater extreme. And the 7 percent crater count in the Opposite Hemisphere may in fact be somewhat larger than the original impact situation.
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