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Response to Comment on "Athabasca Valles, Mars: A Lava-Draped Channel System"

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Science  20 Jun 2008:
Vol. 320, Issue 5883, pp. 1588
DOI: 10.1126/science.1155124

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The recent geologic history of Athabasca Valles, Mars, is controversial. Some studies report ice-rich sediment in its channels, whereas others find only lava. Data from the High-Resolution Imaging Science Experiment camera now confirm that, although certain features exhibit a superficial similarity to ice-related landforms, solidified lava coats the entire channel system.

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