volcanoes in Antarctica. The older rocks have undergone significant glaciation, while the younger ones are largely uneroded and make up the present-day edifice. Volcanic activity mostly occurred under the atmosphere, with the exception of some lavas that may have been erupted in a subaqueous environment and hyaloclastites which have been used to infer that glaciers existed there 15.4 million years ago. Volcanic activity was focused along geologic lineaments on Mount Morning, which were reused during more recent eruptions. Eruptions took place at Mount Morning about 20,000 years ago, forming well-preserved cinder cones. In the 1960s thermal anomalies were observed at Gandalf Ridge, implying that the volcano may still be active, although ground surveys did not detect fumarolic activity. Thus, Mount Morning was considered dormant by Martin, Cooper and Dunlap 2010 and might be the source of tephra layers found in the area. History and name The volcano was discovered by the Discovery Expedition in 1901-1904 and named after a relief ship that took part in the expedition. See also Barlow Rocks List of volcanoes in Antarctica References Sources External links Polar Discovery: Mount Morning Lava Flows Polygenetic shield volcanoes Volcanoes of Victoria Land Volcanoes of the Ross Dependency Hillary Coast Scott Coast Pleistocene shield volcanoes