Abstract
Abstract In the Mt Markham region, an area of 10,000 square miles of folded greywackes, hornfelses, and schists of the Ross System has been intruded and thermally altered by granite and granodiorite. A peneplain surface was cut across these folded rocks and on this has been deposited at least 5,000 ft of sandstone, arkose, conglomerate, and mudstone of the Beacon System. Coal beds and plant-bearing silts in this system contain Permian plant fossils. Sills of dolerite up to 1,500 ft thick were intruded into the sandstone but not into the basement rocks.
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