The production of small primary craters on Mars and the Moon.

Highlights: [•] We model craters on Mars and the Moon using the observed terrestrial fireball flux. [•] We reproduce martian and lunar crater-count chronometry systems. [•] It may be possible to date young surfaces using small craters on the Moon and Mars. [•] Crater-count chronometry systems are derived from predominately primary craters. [Copyright &y& Elsevier]