J L Fastook and J W Head, 2012, “>Mid-latitude Amazonian glaciation on Mars: Controls on accumulation and glacial flow patterns, Lunar and Planetary Science Conference XXXXIII, Houston TX.
Abstract
A model of flow into a crater from episodic layering events driven by obliquity demonstrates that even at Amazonian temperatures, concentric crater fill can be formed in as little as 50 m.y., whereas flow from a single persistent layer takes 450 m.y.