Sorted (clastic) polygons in the Argyre region, Mars, and possible evidence of pre- and post-glacial periglaciation in the Late Amazonian Epoch

The proposed geochronology of “wet-based SP - icy mantle - dry-based NSP” (periods and interval) is entirely new to the community. Moreover, it underlines the possibility that periglacial and glacial boundary-conditions, at least in our study area, may have oscillated much more substantially in the very Late Amazonian Epoch than many workers have thought possible.