Upper Cambrian (Mindyallan) trilobites and stratigraphy of the Kayrunnera Group, western New South Wales  

Authors / CoAuthors

Qizheng, W | Mills, K.J. | Webby, B.D. | Shergold, J.H.

Abstract

Nine species of trilobites are recorded from three localities within a restricted stratigraphic interval near the base of the newly defined Kayrunnera Group (previously Kayrunnera Beds) on Kayrunnera station, western New South Wales. These occurrences come from the Boshy Formation of the Kayrunnera Group. The trilobites described include species of Ammagnostus, Meteoraspis, Biaverta, Blackwelderia, Bergeronites, and Placosema. This assemblage is early Late Cambrian (Mindyallan), and most closely referable to the late Mindyallan zone of Glyptagnostus stolidotus. The steeply dipping,weakly cleaved Upper Cambrian-basal Ordovician Kayrunnera Group overlies, with a well-defined angular unconformity, a more deformed tightly folded and strongly cleaved, graded, turbidite sandstone sequence. The turbidite succession is considered to be Early to Middle Cambrian, by lithological correlation with similar rocks containing sponge spicules and trace fossils elsewhere in the Wonominta Block. The upright isoclinal folds of this sequence and the angular unconformity were produced during a major orogenic phase, probably an early expression of the Delamerian Orogeny, in late Middle Cambrian time. After uplift and erosion there followed a period of early-middle Late Cambrian marine transgression, during which the lower part of the Kayrunnera Group was deposited. The beds include the trilobite-bearing Boshy Formation, of shallow marine origin.

Product Type

document

eCat Id

81243

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Keywords

• GA PublicationJournal

• NSW

Australian and New Zealand Standard Research Classification (ANZSRC)

• Earth Sciences

• Published_External

Publication Date

1989-01-01T00:00:00

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Australian Government Security ClassificationSystem    

Classification - unclassified

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Creative Commons Attribution 4.0 International Licence    

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Use - license

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Purpose

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unknown

Topic Category

geoscientificInformation

Series Information

BMR Journal of Australian Geology and Geophysics 11:1:107-118

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Unknown

Parent Information

Extents

[-34.16, -29.03, 141.12, 144.95]

Reference System

Spatial Resolution

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Journal article (pdf)  

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