The Geology of Brushy Hill, Glenbawn, New South Wales (original) (raw)
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Alcheringa An Australasian Journal of Palaeontology
The first recorded graptolites from the Chesleigh Formation of the Limekilns district are Monograptus prognatus, ?M. transgrediens, Pristiograptus sp. cf. P. shearsbyi and Linograptus posthumus, which unequivocally indicate a Prídolí (Late Silurian) age for the formation. The Silurian-Devonian boundary appears best placed at approximately the boundary between the Chesleigh Formation and the overlying Cookman Formation, despite the presence of the early Lochkovian graptolite Monograptus uniformis uniformis much higher stratigraphically in the Limekilns Formation.In the Hill End Trough succession, the Turondale Formation has yielded conodonts including Amydrotaxis praejohnsoni, which indicates the delta to pesavis conodont Zones of late Lochkovian (Early Devonian) age. Conodonts from the upper part of the Cunningham Formation, at a locality in the Trough west of Mudgee, include Polygnathus nothoperbonus / P. inversus, indicating the perbonus zone of middle Emsian age. The base of the ...
Proceedings- Linnean Society of New South Wales
New palaeontological discoveries and revised mapping of Lower Palaeozoic sedimentary rocks located west of the Catombal Range, between Wellington and Yeoval in central New South Wales, underpins a new model for the Ordovician and Silurian geological history of this region. West of the abandoned Gunners Dam gold mine, large blocks of deep-water siltstones, spiculite, and laminated chert contain Late Ordovician graptolites, including Dicellograptus and Climacograptus (associated with the dendroid Dendrograptus). Along strike to the north near Arthurville, west of Wellington, lensoidal outcrops of sandstone, conglomerate and limestone (previously assigned to the Oakdale Formation) contain a new brachiopod genus and species, described here as Narrawaella wellingtonense, that is associated with conodonts and lingulate brachiopods of Late Ordovician (Katian) age. We interpret all these Upper Ordovician rocks as allochthonous, having been redeposited into Silurian sediments of the Cowra Tr...
Schwartz, L.R.S. 2016. A revised faunal list and geological setting for Bullock Creek, a Camfieldian site from the Northern Territory of Australia. Memoirs of Museum Victoria 74: 263–290. The Camfield beds, in which the Bullock Creek Local Fauna occurs, is a freshwater carbonate unit deposited in a braided-meandering river environment in which abandoned channels formed oxbow lakes. Fossil quarries in the Small Hills outcrop occur in stratigraphically superposed beds. Despite this, there are no detectable changes to the fauna obtained at different levels that demonstrate a significant biochronologic time difference. Within the small mammal fauna, macropodoids are the most abundant group at Bullock Creek. Two species have been described, Balbaroo camfieldensis and Nambaroo bullockensis. A number of other macropodid taxa are also present. A diverse 'possum' fauna is found here, in addition to the miralinids Barguru maru and Barguru kayir, including the phalangerid Wyulda sp. cf. asherjoeli. Dasyuromorphians are also present, as are yaraloid peramelemorphians, including a species referred to Yarala.
2019
Documented in this report is a small fauna recovered from an unnamed stratigraphic unit of bioclastic limestone, black shale and carbonaceous mudstone intersected in a drill hole (NPM-GD871) undertaken by CMOC-Northparkes Mines in the Northparkes porphyry district, located ca 30 km NW of Parkes, central western New South Wales. It includes six conodont species ( Panderodus unicostatus, Pandorinellina exigua, Pelekysgnathus sp., Wurmiella excavata, Zieglerodina remscheidensis and gen. et sp. indet.), one rugose coral ( Microplasma ronense ), three tabulate coral species ( Favosites duni, Squameofavosites bryani and Thamnopora minor ) and one stromatoporoid species ( Densastroma sp.). Faunal analysis indicates a maximum age of late Lochkovian and a minimum age of Pragian for this unit, equivalent to the upper part of the Derriwong Group. The fauna is also comparable with those recovered from the Jerula Limestone Member of the Gleninga Formation (upper part of the Yarra Yarra Creek Gro...
A review of the Cambrian biostratigraphy of South Australia
Palaeoworld, 2006
Cambrian rocks in South Australia occur in the Stansbury, Arrowie, eastern Officer and Warburton Basins. The succession in the Stansbury and Arrowie Basins can be divided into three sequence sets (supersequences), The Cambrian faunas of the Warburton Basin range in age from early Middle Cambrian (Late Templetonian) to very Late Cambrian, although the richest faunal assemblages are late Middle Cambrian (Ptychagnostus punctuosus to Goniagnostus nathorsti Zones). Conodonts, including Cordylodus proavus, occur in a Datsonian fauna.The Arrowie Basin contains the most complete and best studied archaeocyath succession in the Australia–Antarctica region. The Warriootacyathus wilkawillensis, Spirillicyathus tenuis and Jugalicyathus tardus Zones from the lower Wilkawillina Limestone (Arrowie Basin) and equivalents are correlated with the Atdabanian. Botoman archaeocyathids occur higher in the Wilkawillina Limestone. The youngest (Toyonian) archaeocyath fauna in Australia occurs in the Wirrealpa Limestone (Arrowie Basin).Brachiopods and molluscs of the Arrowie and Stansbury Basins can be divided into four biostratigraphic assemblages. Several informal Early Cambrian SSF biostratigraphic assemblages are recognized. Probable tabulate-like corals occur in the Botoman Moorowie Formation. Seven informal acritarch assemblages occur in the Early Cambrian of the Stansbury and Arrowie Basins. Trace fossils may mark the Precambrian–Cambrian boundary. Only two of several tuffaceous horizons from the Stansbury and Arrowie Basins have been dated (i) a date of 522.0 ± 2.1 Ma from the Heatherdale Shale of the Stansbury Basin, about 400 m above latest Atdabanian archaeocyathids and (ii) a date of 522.0 ± 1.8 Ma from the lower part of the Billy Creek Formation in the Arrowie Basin. Neither date is regarded as reliable.