Publication Date:
2006-04-06
Description:
Layered deposits within Valles Marineris and its associated system of canyons have been considered to consist of two different rock types: (1) thick, competent, cliff-forming, light and dark bedded material in canyon walls, and (2) relatively thin, alternating series of light and dark layered material, both horizontal and inclined, that form rounded hills and large flat-topped mesas rising above the canyon floors. The dissimilarity in appearance between canyon wall and floor materials, as well as their contrasting patterns of erosion, have been considered strong evidence that their modes of origin were different.
Keywords:
LUNAR AND PLANETARY EXPLORATION
Type:
NASA. Washington Rept. of Planetary Geology Program, 1983; p 298-300
Format:
text