"In the Dry Valleys of Antarctica, there are buried ice bodies dating to previous ice advances that are covered by soils and volcanic ashes with apparent ages of up to 4 Million years."

That's interesting.

"The most dramatic evidence for stability comes from discovery of the world's oldest glacier ice buried beneath a veneer of till containing former polygons with pockets of in situ volcanic ash dated at 8 million years. The discovery showed that the cold polar climate that presently discourages sublimation must have persisted for millions of years. This finding is controversial in that there is a narrow and particular range of conditions that permit the survival of ice for so long.
Several theoreticians such as Richard Hindmarsh, Bernard Hallet and Felix Ng have argued that theory suggests the buried ice must be much younger and that there must be another explanation for the overlying volcanic ash deposit. We stick to our original conclusion about the stratigraphy of the ash and, indeed, reckon that the ice characteristics and lithology of rock debris in the ice shows it is a remnant of the overriding Miocene ice sheet and that it must have survived 13.6 million years."
http://www.geos.ed.ac.uk/homes/des/antarctica_2.html

Second entry from search: "Dry Valleys of Antarctica + oldest ice"