Late Triassic conodont and palynomorph biostratigraphy and conodont thermal maturation, North West Shelf, Australia

Late Triassic (Norian-Rhaetian) conodonts recovered from borecores and sea-bottom dredge samples on the North West Shelf off Western Australia are assigned to the Metapolygnathus primitius, Epigondolella triangularis, E. spiculata, E. postera, E. bidentata, Misikella hernsteini, and M. posthernsteini Zones. Based on previous studies, particularly from North America, these conodont zones can be used to tie with the standard Triassic ammonite zonation. The present record therefore provides the first set of chronologie anchor points for dating the co-occurring dinocyst assemblages and spore-pollen floras from the North West Shelf. Our conodont data show that the Hebecysta (al. Heibergella) balmei, Rhaetogonyaulax (al. Shublikodinium) wigginsii, and Wanneria (al. Suessia) listeri dinocyst zones are younger than suggested previously, and that some zonal ranges overlap. We conclude that further detailed palynological and conodont studies are urgently needed to resolve these problems and extend conodont age control into the early Late Triassic (Carnian) and the Middle Triassic. Key wells investigated include Ashmore Reef 1, Mt. Ashmore 1B, and Sahul Shoals 1. Conodont thermai maturation data indicate a very low thermal gradient on the Ashmore Platform near the shelf margin, but a more normal thermal gradient on the Sahul Platform and a high heat flow in the onshore Bonaparte Basin.

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Date (Publication)
1994-01-01T00:00:00
Citation identifier
Geoscience Australia Persistent Identifier/https://pid.geoscience.gov.au/dataset/ga/81383

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Australian Geological Survey Organisation

 Canberra
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Nicoll, R.S.

 1
Author

Foster, C.B.

 2
Name

AGSO Journal of Australian Geology and Geophysics

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15:1:101-118

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Commonwealth of Australia (Geoscience Australia)
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Commonwealth of Australia (Geoscience Australia)

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  • Geoscientific information

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  • Journal

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  • WA

Australian and New Zealand Standard Research Classification (ANZSRC)

  • Earth Sciences

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  • Published_External

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Creative Commons Attribution 4.0 International Licence

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CC-BY

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4.0

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http://creativecommons.org/licenses/

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License

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2018-11-01T00:00:00
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https://www.protectivesecurity.gov.au/Pages/default.aspx

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Unclassified
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English
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UTF8

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Commonwealth of Australia (Geoscience Australia)

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Journal article (pdf)

Journal article (pdf)

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GA Publication

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Title

Australian Government Security ClassificationSystem

Edition date
2018-11-01T00:00:00
Website

https://www.protectivesecurity.gov.au/Pages/default.aspx

Classification
Unclassified

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urn:uuid/fae9173a-7144-71e4-e044-00144fdd4fa6

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Language
English
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UTF8
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Commonwealth of Australia (Geoscience Australia)

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Document
Name

AGSO BMR Journal

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Geoscience Australia - short identifier for metadata record with

uuid

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eCatId/81383

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https://ecat.ga.gov.au/geonetwork/srv/eng/catalog.search#/metadata/fae9173a-7144-71e4-e044-00144fdd4fa6

Date info (Revision)
2018-04-20T06:07:40
Date info (Creation)
2014-06-03T00:00:00

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AU/NZS ISO 19115-1:2014

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ISO 19115-1:2014

Metadata standard

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ISO 19115-3

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Geoscience Australia Community Metadata Profile of ISO 19115-1:2014

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Version 2.0, September 2018

Citation identifier
https://pid.geoscience.gov.au/dataset/ga/122551

 
 

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