The Gowlaun Member comprises mudstones with two lenses, several kilometers wide, of coarse sandstones and conglomerates. Stratigraphic evidence shows the member was deposited at depths of more than 100 m below sea level, and it is interpreted as the deposits of a slope area and submarine fans between a shallow continental shelf and deeper basins accumulating turbidites. The coarser lithologies are often channel filling, and show close resemblances to the deposits of modern deep-sea fan valleys. Many of the conglomerates are of cobble grade, are well packed and sorted, and have a preferred orientation of pebbles within bedding planes. Some are imbricated, indicating paleocurrents to the south. The sorting, imbrication, channeling, and thinness of individual beds suggest that they were deposited from traction bed load of powerful currents, which in a deep-sea environment were presumably turbidity currents. The coarse sandstones and fine conglomerates of the Gowlaun Member show features suggestive of deposition by a grain flow-mechanism.