Mount Morning is a shield volcano at the foot of the Transantarctic Mountains in Victoria Land, Antarctica. It lies from Ross Island. Mount Morning rises to an elevation of and is almost entirely mantled with snow and ice. A wide summit caldera lies at the top of the volcano and several ice-free ridges such as Hurricane Ridge and Riviera Ridge emanate from the summit. A number of parasitic vents mainly in the form of cinder cones dot the mountain. The volcano was initially active during the Miocene and erupted in two separate stages with a hiatus in between. The older stage has a different chemical composition than the recent one and is heavily eroded by glaciers. The most recent parasitic vents were active about 20,000 years ago and the volcano could erupt again. Geography and geomorphology Mount Morning lies in Victoria Land, about from Ross Island and at the foot of the Transantarctic Mountains. The Koettlitz Glacier runs along the northwestern foot of Mount Morning and separates it from the Royal Society Range away. Mount Discovery lies next to Mount Morning and is separated from it by the Discovery Glacier. The volcano was originally described in the early to middle 20th century, before more detailed analyses took place in the 1970s, 1980s and 2000s. The volcano rises to above sea level and is capped by a wide caldera that may be the source of a glacier at its northeastern end. Mount Morning has been defined as a large shield volcano that consists of a central volcano overlying an older volcanic complex. With a volume of it is one of the largest volcanoes in the region. Fissure vents have produced at least 185 parasitic vents on the slopes of Mount Morning. They are cinder cones, fissure ridges, lava domes and volcanic necks, and their diameters range from a few metres to a few hundred metres. Many of the vents form alignments, some cone craters overlap or the vents themselves have linear shapes. These linear patterns define northeast-southwest trends, with a minor northwest-southeast alignment. Lava flows emanate from cones and make up the present-day surface of the volcano. Mount Morning is almost entirely covered with snow and ice except where it is ablated by southerly winds. Outcrops of volcanic rocks form the north-northeastern Riviera Ridge and northeastern Hurricane Ridge on the northern flank, Mason Spur on the southern flank and on Helms