Mars climate models predict hundredfold or greater variations in the mass of the Martian atmosphere due to large amplitude variations in Mars' obliquity through time. The production rates of impact craters on the Martian surface should be greatly affected by these atmospheric mass variations. We have constructed a simulation of the meteor bombardment of Mars which shows that during the periods of the lowest theoretical atmospheric mass, the production rates of centimeter-sized hypervelocity impact craters are increased significantly. These results imply that limited in situ observations of microcrater visible on Martian rock faces could validate major aspects of the astronomical theory for climate change on Mars. ¿American Geophysical Union 1993