Age dating crater counting

09-May-2017 22:31

Another example is exhumation, which is common on Mars (Malin and Edgett 2000, 2001).A surface could be formed and covered by sediments at some later time, degrading any craters on the original surface.

The reliability of small crater counts is tested by counting small craters at several young and old lunar surfaces, including Mare Nubium and craters Alphonsus, Tycho and Giordano Bruno.

New thinking about "secondary craters" has thrown this whole foundation of comparative planetary dating into disarray.

Secondary craters are those formed from the debris of an initial impact.

Secondary craters are formed by fallback debris from large impacts (primary craters).

A single large impact can produce a million secondary craters, blurring relationships between crater counts and the age of a surface.

The reliability of small crater counts is tested by counting small craters at several young and old lunar surfaces, including Mare Nubium and craters Alphonsus, Tycho and Giordano Bruno.

New thinking about "secondary craters" has thrown this whole foundation of comparative planetary dating into disarray.

Secondary craters are those formed from the debris of an initial impact.

Secondary craters are formed by fallback debris from large impacts (primary craters).

A single large impact can produce a million secondary craters, blurring relationships between crater counts and the age of a surface.

The impact occurs at high speed, and the final crater depth, diameter, and shape are effectively determined by the surface gravity, the mass of the impactor, and the velocity of the impactor.