Arrays of cones on Mars could be the stamp of recent water ice.
References
Lanagan, P. D, McEwen, A. S., Keszthelyi, L. P. & Thordarson, T. Rootless cones on Mars indicating the presence of shallow equatorial ground ice in recent times, Geophysical Research Letters 28, 2365 - 2367 (2001).
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Clarke, T. Cones on Mars. Nature (2001). https://doi.org/10.1038/news010614-3
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DOI: https://doi.org/10.1038/news010614-3
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