The Editor, Journal of Glaciology

Sir,

The unfortunate omission of two references that should have been utilized and cited in my short note on ice segregation as an origin for lenses of ice in rock glaciers (Reference WayneWayne, 1981) has recently been called to my attention. At the time the paper was written (January and February 1980), I was working in Argentina, and I utilized in its preparation my own observations there and the literature that was then available to me. Prior to undertaking my research in Argentina (Reference WayneWayne, 1981), I had accompanied Reference Shroder and GiardinoShroder and Giardino (1978) in the field as well as serving as a member of Reference GiardinoGiardino’s (unpublished) dissertation committee. In their presentations they suggested that water under pressure beneath ice in “ice-cemented” rock glaciers was in part contributory to rock-glacier motion. In particular, Reference GiardinoGiardino (unpublished) included calculations to show that water could exist in a fluid state beneath ice in a rock glacier.

Our ideas are not identical, in that Giardino and Shroder discussed the role of hydrostatic pressure in basal slip movement, and I applied it to the growth of ice lenses within the debris mass, based on the work of Reference MackayMackay (1973). Nevertheless, a significant part of our concept is similar, so that I was remiss in having failed to acknowledge their prior work. It is indeed unfortunate that I did not have their papers accessible, and their presentations had slipped my mind. I would like to rectify that error by crediting them at this time for the concept that liquid water under pressure may exist below permafrost in “ice-cemented” rock glaciers.