J. L. Fastook and J. W. Head. Concentric crater fill: Rates of glacial accumulation, infilling and deglaciation in the amazonian and noachian of mars. Lunar and Planetary Science XXXXV, #1227, 2014. Introduction: Concentric Crater Fill (CCF) [1-6] is one of many features on Mars that are thought to either contain ice, or to have been formed by read more Concentric crater fill: Rates of glacial accumulation, infilling and deglaciation in the amazonian and noachian of mars