Authors / CoAuthors
Mantle, D.J. | Riding, J.B.
Abstract
The marine and terrestrial palynology of the Middle Jurassic Wanaea verrucosa Zone from the Perseus-3A, Sunrise-2 and Sunset West-1 wells of the North West Shelf of Australia was studied in detail. These three wells represent brackish and shallow marine successions from the Northern Carnarvon and Bonaparte basins respectively. The palynological data derived from these three wells constitute the basis for the formal definition of this important dinoflagellate cyst biozone and its three constituent subzones. The base of the Lower Wanaea verrucosa Subzone is defined by the inception of the index species and is a relatively sparse, low diversity microphytoplankton assemblage; species richness increases up-section. The base of the succeeding Middle Wanaea verrucosa Subzone is defined by the range base of Valvaeodinium spinosum, and the Upper Wanaea verrucosa Subzone is defined by the incoming of the large and distinctive species Endoscrinium kempiae. Other stratigraphically-important datums include the inceptions of ?Bradleyella adela in the lower subzone, Leptodinium spp. and Wanaea lacuna in the middle subzone, and Endoscrinium spp. and Ternia balmei within the upper subzone. Important range tops include Mancodinium semitabulatum and Phallocysta granosa in the middle subzone, and Nannoceratopsis deflandrei in the upper subzone. These and other datums are compared with European ranges to assign a Late Bajocian to Early Bathonian age to the Wanaea verrucosa Zone.
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nonGeographicDataset
eCat Id
72617
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Cnr Jerrabomberra Ave and Hindmarsh Dr GPO Box 378
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2601
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Keywords
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- External PublicationScientific Journal Paper
- ( Theme )
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- fossil
- ( Theme )
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- palaeontology
- ( Theme )
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- stratigraphy
- Australian and New Zealand Standard Research Classification (ANZSRC)
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- Earth Sciences
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- Published_Internal
Publication Date
2011-01-01T00:00:00
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