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| Titel: |
Sedgeford Formation, a new Middle Devonian cratonic sequence from central Queensland and its regional significance |
| Auteur: |
Henderson, R. A. Davis, B. K. Cook, A. G. |
| Verschenen in: |
Australian journal of earth sciences |
| Paginering: | Jaargang 42 (1995) nr. 4 pagina's 437-444 |
| Jaar: |
1995-08 |
| Inhoud: |
A newly discovered Middle Devonian sequence uplifted and exposed along a major thrust fault truncating the western limb of the Mt Beaufort Anticline of the Drummond Basin, Alpha district, central Queensland is described and named the Sedgeford Formation. Two informal members within the formation consist of a lower unit dominated by non-marine sandstone which is conformably succeeded by an upper unit of richly fossiliferous marine sandstone with limestone interbeds. Conodonts and marine invertebrates indicate that the marine member is of Eifelian (Middle Devonian) age. A locally developed paludal facies within the lower member contains a diverse fish assemblage. The exposed sequence exceeds 1 km in thickness and is unconformably overlain by Upper Carboniferous Joe Joe Formation to the west. To the east it abuts the Bottle Tree Fault but boulder-size metamorphic clasts from the Devonian succession suggest that a metamorphic basement lies beneath, and relatively close to, the lowest preserved horizons. The Sedgeford Formation was deposited synchronously with part of the succession of the Adavale Basin located to the southwest and indicates that Devonian basinal development was more widespread in central Queensland than previously recognized. The widespread remnant successions of Emsian and Eifelian age developed in cratonic settings in central Queensland represent back-arc basinal developments which were contemporary with active margin stratotectonic assemblages of the northern New England Orogen developed to the east. |
| Uitgever: |
Taylor & Francis |
| Bronbestand: |
Elektronische Wetenschappelijke Tijdschriften |
Details van artikel 6 van 9 gevonden artikelen
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