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Science 20 June 2008:
Vol. 320. no. 5883, p. 1588
DOI: 10.1126/science.1155124
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Technical Comments

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

W. L. Jaeger,1* L. P. Keszthelyi,1 A. S. McEwen,2 T. N. Titus,1 C. M. Dundas,2 P. S. Russell3

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.

1 Astrogeology Team, United States Geological Survey (USGS), Flagstaff, AZ 86001, USA.
2 Lunar and Planetary Laboratory, University of Arizona, Tucson, AZ 85721, USA.
3 Physikalisches Institut, Universität Bern,CH-3012,Bern, Switzerland.

* To whom correspondence should be addressed. E-mail: wjaeger{at}usgs.gov

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