Mount Moulton is a complex of ice-covered shield volcanoes, standing east of Mount Berlin in the Flood Range, Marie Byrd Land, Antarctica. It is named for Richard S. Moulton, chief dog driver at West Base. The volcano is of Pliocene age and is presently inactive. The Prahl Crags are located on the southern slopes of Mount Moulton and are part of a caldera. There, an exposed area of blue ice can be found; this ice contains tephra layers from mainly neighbouring Mount Berlin volcano and some of the ice is almost half a million years old. Geology and geomorphology Mount Moulton lies in Marie Byrd Land of Western Antarctica and in the region of the West Antarctic Ice Sheet. It is part of a system of volcanoes including Mount Berlin, Mount Takahe and Mount Waesche as well as of recently active subglacial volcanism. The volcano is named for Richard S. Moulton, chief dog driver of the United States Antarctic Service Expedition; the western end of the Flood Range where Mount Moulton lies was visited by this expedition in December 1940. Other field expeditions took place in 1967-1968, 1977-1978, 1993-1994 and 1999-2000. The volcano appears to be of Pliocene age and there is no evidence that it was glaciated during its eruptions. Only a few outcrops of Mount Moulton have been dated and these yield ages of 5.3 million years, with further age estimates of 4.9 – 4.7 million years ago, 5.9 million years ago and 1.04 ± 0.04 million years ago at Gawne Nunatak, which is a parasitic cone. There is no evidence of eruptive or thermal activity unlike at its neighbour Mount Berlin. Earthquakes have been recorded at Mount Moulton and are either of volcano-tectonic origin or due to the movement of ice along the flanks of the volcano. The mountain is high, rising about above the ice surface on its northern flank, and located within the Flood Range; Mount Berlin lies across the wide, high-elevation Wells Saddle to the west and Kohler Dome is east of Moulton. Even farther east lie Mount Bursey, Mount Andrus, Mount Kosciuszko and Mount Kauffman, in the Ames Range. Mount Moulton is an obstacle to ice flow in the West Antarctic Ice Sheet, which has piled up on the mountain and is about higher on the upstream side. Mount Moulton is formed by a complex of glaciated but largely uneroded shield volcanoes with