GEOG 441 Lecture Notes - Lecture 3: Terra Sirenum, Noachis Terra, Terra Cimmeria
Document Summary
Aonia terra southwest of noachis terra and argyre planitia. Its central areas are classic noachian landscapes, highland cratered units with many small dendritic valley networks. There is much evidence of contemporary olian processes, including large dune deposits at the base of some crater rims, with some evidence of dunes overtaking older dunes trapped against a topographic barrier. Much of the aonian cratered landscape shows signs of being subdued in contrasts, very akin to the crater softening and flattening seen in the discussion of noachis terra. There is a heavy profusion of larger craters in aonia terra, many showing the pedestal structure seen in noachis terra. The pedestals preserve craters on a surface once higher than today"s, about 500 m higher (head et al. 2003), which was eroded away around the craters and their resistant ejecta blankets by, presumably, meltwater from once larger polar ice deposits.
