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ReportsMeter-Scale Morphology of the North Polar Region of Mars
Mars' north pole is covered by a dome of layered ice deposits. Detailed (
1 Astrogeology Team, United States Geological Survey (USGS), Flagstaff, AZ 86001, USA.
* To whom correspondence should be addressed. E-mail: kherkenhoff{at}usgs.gov
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30 centimeters per pixel) images of this region were obtained with the High-Resolution Imaging Science Experiment on board the Mars Reconnaissance Orbiter (MRO). Planum Boreum basal unit scarps reveal cross-bedding and show evidence for recent mass wasting, flow, and debris accumulation. The north polar layers themselves are as thin as 10 centimeters but appear to be covered by a dusty veneer in places, which may obscure thinner layers. Repetition of particular layer types implies that quasi-periodic climate changes influenced the stratigraphic sequence in the polar layered deposits, informing models for recent climate variations on Mars. 
Present address: Center for Earth and Planetary Studies, National Air and Space Museum, Washington, DC 20013, USA. 
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