A type section of the Permian system in the Hobart Area

An unbroken succession of Permian sediments about 1430 feet thick on the northern flanks of Mt. Nassau, about 10 miles north-west of Hobart, Tasmania, shows the following succession of formations from the base upwards: Bundella Mudstone; Faulkner Group including the Geiss Conglomerate, Rathbones Sandstone and Siltstone, Byers Sandstone, Jarvis Siltstone, Parramore Sandstone and Siltstone, Altamont Conglomerate and Fergusson Siltstone; Rayner Sandstone; Cascades Group including the Nassau Siltstone, Berriedale Limestone and Grange Mudstone; "Woodbridge Glacial Formation"; Risdon Sandstone and finally the Ferntree Mudstone. These range in age from Lower Artinskian to Kungurian. These formations, except the "Woodbridge Glacial Formation", are defined.
The Faulkner Group consists of two cyclothems, recording two brief emergences, one soon after the other,in a time of general submergence.
The Grange Mudstone and Berriedale Limestone are at least partly facies variants of one another. A notable feature is the presence of erratics, except in the two non-marine formations in the Faulkner Group, and this is perhaps related to the poor sorting, and mineralogical immaturity of the sediments and the angularity of most of the grains in all rocks. All of these features are considered as the result of glacio-marine deposition. The source area included granitic, sedimentary and regionally metamorphosed rocks.