globalchange  > 过去全球变化的重建
DOI: 10.1016/j.palaeo.2014.10.015
论文题名:
Early Triassic (early Olenekian) life in the interior of East Gondwana: Mixed marine-terrestrial biota from the Kockatea Shale, Western Australia
作者: Haig D.W.; Martin S.K.; Mory A.J.; McLoughlin S.; Backhouse J.; Berrell R.W.; Kear B.P.; Hall R.; Foster C.B.; Shi G.R.; Bevan J.C.
刊名: Palaeogeography, Palaeoclimatology, Palaeoecology
ISSN: 0031-0182
出版年: 2015
卷: 417
起始页码: 511
结束页码: 533
语种: 英语
英文关键词: Gondwana rift ; Mixed marine-terrestrial assemblage ; Palaeogeography ; Perth basin ; Triassic biotic recovery
英文摘要: A new terrestrial-marine assemblage from the lower beds of a thin outcrop section of the Kockatea Shale in the northern Perth Basin, Western Australia, contains a range of fossil groups, most of which are rare or poorly known from the Lower Triassic of the region. To date, the collection includes spinose acritarchs, organic-cemented agglutinated foraminifera, lingulids, minute bivalves and gastropods, ammonoids, spinicaudatans, insects, austriocaridid crustaceans, actinopterygians, a temnospondyl-like mandible, plant remains, and spores and pollen. Of these groups, the insects, crustaceans and macroplant remains are recorded for the first time from this unit.Palynomorphs permit correlation to nearby sections where conodonts indicate an early Olenekian (Smithian) age. The locality likely represents the margin of an Early Triassic shallow interior sea with variable estuarine-like water conditions, at the southwestern end of an elongate embayment within the East Gondwana interior rift-sag system preserved along the Western Australian margin. Monospecific spinose acritarch assemblages intertwined with amorphous organic matter may represent phytoplankton blooms that accumulated as mats, and suggest potentially eutrophic surface waters. The assemblage represents a mixure of marine and terrestrial taxa, suggesting variations in water conditions or that fresh/brackish-water and terrestrial organisms were transported from adjacent biotopes. Some of the lower dark shaly beds are dominated by spinicaudatans, likely indicating periods when the depositional water body was ephemeral, isolated, or subjected to other difficult environmental conditions.The biota of the Kockatea Shale is insufficiently known to estimate biotic diversity and relationships of individual taxa to their Permian progenitors and Triassic successors, but provides a glimpse into a coastal-zone from the interior of eastern Gondwana. Specialist collecting is needed to clarify the taxonomy of many groups, and comparisons to other Lower Triassic sites are required to provide insights into the pattern of biotic decline and recovery at the end-Permian crisis. © 2014 Elsevier B.V.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/69113
Appears in Collections:过去全球变化的重建

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作者单位: Centre for Petroleum Geoscience and CO Sequestration, School of Earth and Environment (M004), The University of Western Australia, 35 Stirling Highway, Crawley, WA, Australia; Geological Survey of Western Australia, Department of Mines and Petroleum, 100 Plain Street, East Perth, WA, Australia; Earth and Planetary Sciences, Western Australian Museum, Locked Bag 49, Welshpool DC, WA, Australia; Department of Palaeobiology, Swedish Museum of Natural History, Box 50007, Stockholm, Sweden; Department of Applied Geology, Curtin University, Kent Street, Bentley, WA, Australia; Palaeobiology Programme, Department of Earth Sciences, Uppsala University, Villavägen 16, Uppsala, Sweden; Geoscience Australia, GPO Box 383, Canberra, ACT, Australia; School of Life and Environmental Sciences, Deakin University, 221 Burwood Highway, Burwood, VIC, Australia

Recommended Citation:
Haig D.W.,Martin S.K.,Mory A.J.,et al. Early Triassic (early Olenekian) life in the interior of East Gondwana: Mixed marine-terrestrial biota from the Kockatea Shale, Western Australia[J]. Palaeogeography, Palaeoclimatology, Palaeoecology,2015-01-01,417
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