Early Carboniferous<i>Siphonodella</i>(Conodonta) faunas from eastern Australia

Mory, Arthur J.; Crane, David T.

doi:10.1080/03115518208619637

Cited by 28 publications

(7 citation statements)

References 9 publications

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“…15). The magnetozone TB1n from the Tamworth Belt (four sampling levels) is younger than MI1n B , since the Lower crenulata Zone occurs in the underlying Brushy Hill Limestone in the sol brachiopod zone (Mory & Crane 1982;Fig. 4).…”

Section: Mississippianmentioning

confidence: 93%

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A geomagnetic polarity timescale for the Carboniferous

Hounslow

2021

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The geomagnetic polarity pattern for the Carboniferous is incompletely known, but with the best resolved parts in the Serpukhovian and Bashkirian. Hence, data from both igneous and sedimentary units are also used in an additional polarity bias evaluation. In the Tournaisian to mid Visean interval polarity is mainly derived from palaeopole-type palaeomagnetic studies, allowing identification of polarity bias chrons. Seven polarity bias chrons exist in the Mississippian (MI1nB to MI4nB) with an additional 33 conventional magnetochrons and submagnetochrons (MI4r to MI9r). The Moscovian and Gzhelian polarity is best resolved in magnetostratigraphic studies from the Donets Basin and the southern Urals. Dispute about the reliability of these data is ill-founded, since an assessment of supporting data from palaeopole-type studies suggests that these datasets currently provide the best magnetic polarity data through the Pennsylvanian. Polarity bias assessment indicates a normal polarity bias zone in the Kasimovian. In the Pennsylvanian there are 27 conventional magnetochrons and submagnetochrons (PE1n to CI1r) and one normal polarity bias chron (PE8nB). The Kiaman Superchron begins in the mid Bashkirian, with clear data indicating brief normal polarity submagnetochrons within the Superchron. The magnetochron timescale is calibrated using 31 U-Pb zircon dates and a quantitative Bayesian-based age-scaling procedure.

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Section: Mississippianmentioning

confidence: 93%

“…At ages older than MI4r, magnetozones are intervals of reverse or normal polarity bias. The Lower crenulata conodont zone for the Brush Hill Limestone (in sol brachiopod Zone) from Mory & Crane (1982). Fig.…”

Section: Figure Captionsmentioning

confidence: 99%

A geomagnetic polarity timescale for the Carboniferous

Hounslow

2021

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“…Column IV; Glenbawn section. Units and thicknesses from Roberts & Oversby (1974) and Mory (1978), and positions of conodonts from Mory & Crane (1982). F = local fault.…”

Section: Volcanic Rocks Near the Devonian-carboniferousmentioning

confidence: 99%

“…The latter is overlain by a thick succession of mudstone, lithic sandstone and minor limestone (Roberts & Oversby, 1974). Calcareous concretions within the upper part of the Macqueen Member, approximately 168 m above the base of Section 1 of Roberts & Oversby (1974), have yielded the conodont S. sulcata (locations L55 and L54 of Mory & Crane (1982)). The Brushy Hill Limestone Member contains conodonts of the lower S. crenulata Zone (Mory & Crane, 1982).…”

Section: Volcanic Rocks Near the Devonian-carboniferousmentioning

confidence: 99%

The numerical age of the Devonian-Carboniferous boundary

et al. 1992

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The SHRIMP ion microprobe has been used to date zircons in a 1 cm thick bentonite located in the Hasselbachtal auxiliary global stratotype section through the Devonian-Carboniferous boundary in Germany, and a tuff located at a similar biostratigraphic level in Australia. Multiple replicate analyses have yielded indistinguishable ages, and indicate 353.2±4.0 Ma (2σ) as the age of the boundary. Obtaining an age for the boundary in the German reference section depended on the ability of SHRIMP to date a small sample and to target small areas of structurally complex zircons. Future refinements of the age of this boundary may depend on re-analysis of this uniquely placed bentonite, and this highlights the value of defining biostratigraphic stratotypes in the vicinity of known dateable horizons.

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“…The succession has an overall sequential and lithological similarity with that in the adjoining Werrie block, but in detail there are substantial differences. The basal Tournaisian Kingsfield Formation, known only from a limited region adjacent to Lake Glenbawn (Plate 1), contains marginal-marine to continental volcanolithic sedimentary rocks and pyroclastics (Roberts & Oversby 1974;Mory 1978;Mory & Crane 1982). It is equivalent to marine mudstones and siltstones north of Belltrees (Saxton 1984;Roberts et al 1991) included in the Parry Group (Plate 1).…”

Section: Rouchel Blockmentioning

confidence: 99%

Carboniferous to Lower Permian stratigraphy of the southern Tamworth Belt, southern New England Orogen, Australia: boundary sequences of the Werrie and Rouchel blocks

2006

Australian Journal of Earth Sciences

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Carboniferous to Lower Permian successions along the western border of the Tamworth Belt between Wallabadah and Muswellbrook were remapped to clarify the stratigraphy and establish a boundary between the Werrie and Rouchel blocks. The boundary, located at the Waverley Fault, separates Carboniferous sequences containing different formations and volcanic members. SHRIMP AS3 dating of volcanic members indicates that successions within the Rouchel and Gresford blocks were deposited, uplifted and eroded at different times. The lacustrine Woodton Formation in the Werrie block, previously considered Carboniferous, is earliest Permian (Asselian) from palaeobotanical and SHRIMP AS3 evidence. Stratigraphic and palaeoenvironmental differences between the Werrie and Rouchel blocks suggest that they were not directly juxtaposed during the greater part of the Carboniferous, supporting palaeomagnetic evidence that blocks within the Tamworth Belt are allochthonous. Superposition of the western extremity of the Waverley Fault by Lower Permian (Sakmarian) formations and intrusion of folded and faulted Devonian to Lower Permian successions by the Barrington Tops Granodiorite (ca 280 Ma) indicate that the Werrie, Rouchel and Gresford blocks were subjected to tectonism before the Late Permian Hunter -Bowen Orogeny.

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Early CarboniferousSiphonodella(Conodonta) faunas from eastern Australia

Cited by 28 publications

References 9 publications

A geomagnetic polarity timescale for the Carboniferous

A geomagnetic polarity timescale for the Carboniferous

The numerical age of the Devonian-Carboniferous boundary

Carboniferous to Lower Permian stratigraphy of the southern Tamworth Belt, southern New England Orogen, Australia: boundary sequences of the Werrie and Rouchel blocks

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