recorded from ice cores at the WAIS Divide and at Taylor Glacier in the McMurdo Dry Valleys, where they constrain estimates of the rate of deglaciation. These eruptions released a large quantity of halogens into the stratosphere, which together with the cold and dry climate conditions of the last glacial maximum would presumably have led to massive ozone destruction and the formation of an ozone hole. Bromine and sulfur isotope data indicate that the amount of UV radiation in the atmosphere did increase at that time in Antarctica. As is the case with the present-day ozone hole, the ozone hole created by the Takahe eruptions might have altered the Antarctic climate and sped up deglaciation, which was accelerating at that time, but later research has determined that the warming was most likely not volcanically forced. Holocene and recent activity Activity waned after this point, two hydromagmatic eruptions being recorded 13,000and 9,000years ago and a magmatic eruption 7,500years ago. This last eruption is also known from the Byrd ice core and may correspond to an eruption 8,200±5,400years ago recorded at Mount Waesche and the Takahe edifice and to two 6217 and 6231 BC tephra layers at Siple Dome. Tephra from a 8,200before present eruption has been recorded at Siple Dome and Mount Waesche. A 7,900before present eruption at Mount Takahe is one of the strongest eruptions at Siple Dome and Byrd Station of the last 10,000years. Another eruption reported by the Global Volcanism Program may have occurred in 7050 BC. At Siple Dome, a further eruption between 10,700 and 5,600years ago is recorded and one tephra layer around 1783 BC (accompanied by increased sulfate concentrations in ice) might also come from Mount Takahe. Glass shards at Law Dome emplaced in 1552 and 1623 AD may come from this volcano as well. The Global Volcanism Program reports 5550 BC as the date of the most recent eruption, and the volcano is currently considered dormant. There is no evidence of fumarolic activity or warm ground, unlike at Mount Berlin, which is the other young volcano of Marie Byrd Land. Seismic activity recorded at depth around the volcano may be linked to its activity. Mount Takahe has been prospected for the possibility of obtaining geothermal energy. See also List of Ultras of Antarctica List of volcanoes in Antarctica Explanatory notes References Citations Sources External links Polygenetic shield volcanoes Volcanoes of Marie Byrd Land Potentially