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(1975): Archaeocyatha provenant de blocs erratiques des tillites de Dwyka (Afrique de Sud).
Dott, R.H., 1961, Squantum "Tillite", Massachusetts; evidence of glaciation or subaqueous mass movements?: Geological Society of America, Bulletin, v.
Other possible minor sources of amphibolite are Early Permian glacial tillites which occur near Lithgow on the western side of the Blue Mountains, in the central Hunter Valley, and in the Shoalhaven region.
The underlying geological units are metamorphic and feature a steeply bedded stratigraphy of resistant interbedded tillites forming the spine (Ward Hill, Appila Formation); quartzite shales and massive quartzites in the upper slope; less resistant, fine-grained siltstones, mudstones, and shales in the lower slope (Tindelpina Shales); and Quaternary alluvial deposits in the valley floor that mantle Tapley Hill slates and siltstones (Geological Survey of South Australia 1964).
Key point 2: Vast areas of tills and tillites in arctic parts and adjacent areas of the Earth, together with debris in mountaneous and arid regions in other climatic belts, contain immense volumes of chemically almost intact phyllosilicates.
The reservoirs are unusual in that many of them are periglacial sandstones often sealed by glacial tillites, one of the few areas in the world where deposits of this type host commercial hydrocarbon reserves - see Oman survey in Vol.
Brian Harland of the University of Cambridge when he noticed that glacial deposits (called tillites) from the Neoproterozoic era are found on rock outcroppings on every continent, with the possible exception of Antarctica.
Many Fms are periglacial sandstones sealed by glacial tillites. This is one of the few areas in the world where such Fms host petroleum reserves in commercial quantities.