Charles E. Helsley, 1972. "Are Lunar Rilles Inverted Eskers?", Studies in Earth and Space Sciences, R. Shagam, R. B. Hargraves, W. J. Morgan, F. B. Van Houten, C. A. Burk, H. D. Holland, L. C. Hollister
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Sinuous rilles on the lunar surface may have been formed by the movement of volatiles (H2O + CO2) in a channel between the basement surface and a surficial permafrost layer. Later sublimation of the ice formed in the vicinity of this channel would produce the features observed today.