THE GEOLOGY OF THE BONAPARTE GULF BASIN
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Abstract:
An estimated total of over 20,000 feet of Palaeozoic sediments accumulated in the Bonaparte Gulf Basin. The thickest known continuous section is that in Bonaparte No. 1 Well, abandoned at 10,530 feet in Upper Devonian sandstone and shale. Rocks of the Basin margins are mainly sandstones and limestones (in part reef), whereas a thick shale section has been discovered in the deeper parts. Data from recent seismic surveys indicate that the seaward extension of the Basin is considerable and that a thick pile of sediments is preserved there.The Bonaparte Gulf Basin formed as a result of subsidence of the north-eastern part of the Kimberley Block along fault lines associated with the Halls Creek Mobile Zone. This zone borders the south-eastern margin of the Basin and trends north-east. One basement block, represented by the presentday Pincombe Range, remained relatively high. The Bonaparte Gulf Basin can be divided into two subsidiary basins, the Carlton Basin to the west and north-west and the Burt Range Basin in the east and south-east. The Pincombe Range separates the two.Marine sediments were deposited in the Carlton Basin during the Middle and Upper Cambrian, Lower Ordovician, Upper Devonian and Lower Carboniferous epochs. Angular unconformities have been mapped between the Lower Ordovician and Upper Devonian rocks, and between Upper Devonian and Lower Carboniferous rocks. In the Burt Range Basin, deposition began in the Upper Devonian and continued with minor breaks through the Lower Carboniferous. Faults along the south-eastern margin were active through this period and affected the character of the sediments.Permian sediments are widely distributed and lie with unconformity on older units.Keywords:
Devonian
Basement
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Devonian
Late Devonian extinction
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Abstract The Daposhang section at Muhua, Changshun, Guizhou, is an excellent and attractive Devonian‐Carboniferous boundary section. The transitional beds between the Devonian and Carboniferous of the section are continuous and well exposed, belonging to the deep‐water basin facies. Abundant fossil groups have been discovered from this section: conodonts, ammonoids, trilobites, ostracods, vertebrate microfossils and so on. So far as known, it has the most continuous and complete conodont zonation for the Devonian‐Carboniferous boundary beds in the world. It is especially worth pointing out that both typical Siphonodella praesulcata and the transitional forms between S. praesulcata and S. sulcata have been found from the upper praesulcata Zone of the Daposhang section. Evidently, we can not only prove the actual existence of the evolutionary lineage from S. praesulcata to S. sulcata , but also exactly define the level of the Devonian‐Carboniferous boundary. In this paper, the development of the Devonian‐Carboniferous boundary beds at the Daposhang section is dealt with and the section is compared with the Muhua section and the Nanbiancun section which are the candidates for the Devonian‐Carboniferous boundary stratotype. In the authous' opinion the Daposhang section is obviously better than the Muhua and the Nanbiancun sections, hence it can be recommended as one of the candidates for the international Devonian‐Carboniferous boundary stratotype.
Devonian
Stratotype
Section (typography)
Conodont
Late Devonian extinction
Tournaisian
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Shirley and Horsfield (1940) in describing the Carboniferous Limestone of the Castleton-Bradwell area in North Derbyshire submitted evidence that the richly fossiliferous rocks of B 2 age, the “Castleton reef knoll limestones lie with strong unconformity on the D 1 -D 2 limestones, being piled against steep slopes or cliffs of Mid-Carboniferous age of at least 550 feet. The Nun Low limestones of P age follow with a similar relationship to the Castleton Limestones”.
Viséan
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Devonian
Late Devonian extinction
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Brachiopods from the Devonian-Carboniferous passage beds in the Babilon 1 column (Western Pomerania) (Preliminary Report) 42 brachiopod species belonging to 29 genera have been determined from the higher members of the Famennian and the Devonian-Carboniferous passage beds of the Babilon 1 column. Their distribution in the profile is shown and two assemblages distinguished, namely assemblage A - of the Devonian brachiopods and B – containing Devonian, Strunian and Carboniferous forms. Three subassemblages have been distinguished within the B” assemblage.
Devonian
Assemblage (archaeology)
Late Devonian extinction
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ABSTRACT The well-documented Middle Ordovician regional unconformity between the Franklin Mountain and Mount Kindle Formations of the northern Interior Plains (NWT) can be continued into the Arctic Lowlands. Paleontological data exist that suggest Middle Ordovician strata are absent. A sedimentary hiatus is recognized between Lower and Upper Ordovician rocks on Somerset Island and is equated to the Middle Ordovician unconformity of the Interior Plains. A similar sedimentary break, described from Baffin Island, also may be the Middle Ordovician regional unconformity.
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Two unconformities in the Ordovician of western Tarim basin,Northwest China have been recognized on the base of sedimentary,stratigraphical and palaeontological data.One is between the Lower Ordovician Penglaiba Formation and Yingshan Formation,which is a parallel unconformity indicated by weathered beds and stratigraphical gaps.That two or three conodont zones/assemblages are absent from the unconformity indicates this stratigraphical gap is about 5.5~7.2 Ma.The other one is between the Upper Ordovician Terekawat Formation and the underlying formations,which presents commonly as a parallel unconformity or an angular unconformity in some regions.Palaeontological data show the underlying beds belonging to different formations at different sections,which are the Yingan Formation at the Dawangou,East Dawangou and Yangjikan sections that belongs to the Aijiashanian of late Late Ordovician according to the chitinozoans,or the Qilang Formation at the Sishichang and Terekawat sections that is early—middle Aijiashanian in age as indicated by conodonts;or the Tumuxiuke Formation or Yijianfang Formation at the Sanjianfang section that have been assigned to the early Aijiashanian of Late Ordovician or Darriwilian of Middle Ordovician on the basis of conodonts,or the Yingshan Formation at the North Xiker and East Xiker sections that is early Middle Ordovician based on the conodonts as well.The stratigraphical gap varies from 1 or 2 Ma to over 20 Ma as the maximum.
Conodont
Tarim basin
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