Trilobites and agnostids from the Goyder Formation (Cambrian Series 3, Guzhangian; Mindyallan), Amadeus Basin, central Australia

A new assemblage containing twenty-two species of trilobites and agnostids is described from the Goyder Formation (Cambrian Series 3) in the Ross River Syncline and Gardiner Ranges of the Amadeus Basin, Northern Territory, central Australia. New trilobite taxa described include the genus, Trephina g...

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Bibliographic Details
Published in:Zootaxa
Main Authors: Smith, Patrick M., Paterson, John R., Brock, Glenn A.
Format: Article in Journal/Newspaper
Language:English
Published: 2018
Subjects:
Trilobita
Agnostida
middle Cambrian
Northern Territory
Australia
East Gondwana
Antarc*
Antarctica
antarcticus
East Antarctica
Victoria Land
Online Access:https://researchers.mq.edu.au/en/publications/69e891bb-c80e-4ba3-866c-c0290ee8e18d
https://doi.org/10.11646/zootaxa.4396.1.1
http://www.scopus.com/inward/record.url?scp=85044162785&partnerID=8YFLogxK
http://purl.org/au-research/grants/arc/DP120104251
Description
Summary:A new assemblage containing twenty-two species of trilobites and agnostids is described from the Goyder Formation (Cambrian Series 3) in the Ross River Syncline and Gardiner Ranges of the Amadeus Basin, Northern Territory, central Australia. New trilobite taxa described include the genus, Trephina gen. Nov., and four new species Adelogonus prichardi sp. Nov., Hebeia stewarti sp. Nov., Liostracina joyceae sp. Nov., and Trephina ranfordi sp. Nov. Two agnostid taxa previously known only from Antarctica, Ammagnostus antarcticus Bentley, Jago & Cooper, 2009 and Hadragnostus helixensisJago & Cooper, 2005, are also documented. Of the two agnostid species, the latter is the most age diagnostic, previously reported from the Cambrian Series 3 (Guzhangian; late Mindyallan; Glyptagnostus stolidotus Zone) Spurs Formation in Northern Victoria Land. This age for the Goyder Formation assemblage is supported by the co-occurrence of the trilobites Biaverta reineri Öpik, 1967, Blackwelderia repanda Öpik, 1967, Henadoparia integra Öpik, 1967, Monkaspis cf. Travesi(Öpik, 1967), Nomadinis pristinus Öpik, 1967, Paraacidaspis? priscilla (Öpik, 1967), and Polycyrtaspis cf. FlexuosaÖpik, 1967, also known from the late Mindyallan (G. Stolidotus Zone) successions of the neighbouring Georgina Basin (Northern Territory and Queensland). The generic assemblage of the Goyder Formation is also similar to those from the Guzhangian (Mindyallan) of other parts of Australia (New South Wales, South Australia, and Western Australia), in addition to East Antarctica and North and South China.

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