![]() The total uncertainty could be much higher, though, since the ratio of lunar to Martian cratering rate which is of basic importance in the models is believed to be known no better than within a factor of 2. The differences at old ages are significant, the differences at younger ages are considerable and give absolute ages for the same crater frequencies as different as a factor of 3. Starting from somewhat different lunar chronologies, rather different Martian cratering chronologies are found in the literature. All models for absolute dating rely on the lunar cratering chronology and on the validity of its extrapolation to Martian conditions. ![]() In the absence of dates derived from rock samples, impact crater frequencies are commonly used to date Martian surface units. ![]() Absolute ages from crater statistics: Using radiometric ages of Martian samples for determining the Martian cratering chronology ![]()
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