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Science 21 November 1980:
Vol. 210. no. 4472, pp. 895 - 897
DOI: 10.1126/science.210.4472.895
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Articles

Martian Valleys: Morphology, Distribution, Age, and Origin

DAVID C. PIERI 1

1 Jet Propulsion Laboratory, California Institute of Technology, Pasadena 91103

Branching valley networks throughout the heavily cratered terrain of Mars exhibit no compelling evidence for formation by rainfall-fed erosion. The networks are diffuse and inefficient, with irregular tributary junction angles and large, undissected intervalley areas. Rather, the deeply entrenched canyons, with blunt amphitheater terminations, cliff-bench wall topography, lack of evidence of interior erosion by flow, and clear structural control, suggest headward extension by basal sapping. The size-frequency distributions of impact craters in these valleys and in the heavily cratered terrain that surrounds them are statistically indistinguishable, suggesting that valley formation has not occurred on Mars for billions of years.

Submitted on April 15, 1980
Revised on July 8, 1980


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Science. ISSN 0036-8075 (print), 1095-9203 (online)