No abstract

No abstract

Fretted terrain is but one of a variety of lowland terrains on the Martian surface that, like members of an isomorphous series, have some characteristics in common and are shaped by some of the same genetic processes. These terrains are artificially separated to facilitate handling (Table 1). At one extremity are the south polar pits described elsewhere [Sharp, 1973]; at the other are the huge equatorial troughs.Fretted terrain is characterized by smooth, flat, lowland areas separated from a cratered upland by abrupt escarpments of complex planimetric configuration and a maximum estimated height approaching 1-2 km (Figure 1). It is the product of some unusual erosive or

No abstract

No abstract