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Mary G. Chapman, U.S. Geological Survey

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This map is one in a series of 1:500,000 scale geologic maps initiated by the National Aeronautics and Space Administration to investigate areas of particular scientific interest on Mars, The West Mangala Valles area merits detailed geologic study because it contains several small channels whose ages can be determined relative to geologic units that range in age from early (Noachian) to late (Amazonian) Periods of martian history. Because the small channels are of three ages and channels of each age are of a geomophic type unique to that age, their study increases our understanding of the continuity of fluvial processes in the evolutionary history of Mars. For these reasons, part of the area is a proposed site for...
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