ash was found deposited on the ice surface under the Hudson Mountains, close to Pine Island Glacier. On Mars Many scientists believe that liquid water exists many kilometers below the surface of Mars, but at this point in time it is impossible to drill to those depths with the rovers in existence. Meredith Payne and Jack Farmer of Arizona State University have studied images from the Viking and Mars Orbiter cameras in search of possible sub-glacial volcanoes that could carry microbes to the surface. Ice cores It is possible to track catastrophic subglacial volcano eruptions in time with the analysis of ice cores such as the Vostok core. Subglacial volcanic eruptions are identified by layers of high concentrations of NO and SO. See also Subglacial eruption Subglacial mound Underwater volcano Tuya Tindar (landform) Subglacial caldera 1996 eruption of Gjálp References Volcanoes of Canada: Types of volcanoes Accessed Jan. 8, 2006 Glaciovolcanism