Notanopliid brachiopods and associated fossils from the Yea area, central Victoria: a key to resolving age and correlation problems in a complex geological setting

Clem Earp

doi:10.1071/RS23021

RESEARCH ARTICLE (Open Access)

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Notanopliid brachiopods and associated fossils from the Yea area, central Victoria: a key to resolving age and correlation problems in a complex geological setting

Clem Earp

^A ^*

+ Author Affiliations

- Author Affiliations

^A Independent Researcher.

^* Correspondence to: omaiosys@yahoo.com.au

Handling Editor: Bill Birch

Proceedings of the Royal Society of Victoria 136, RS23021 https://doi.org/10.1071/RS23021

Submitted: 19 September 2023 Accepted: 22 February 2024 Published: 13 June 2024

© 2024 The Author(s) (or their employer(s)). Published by CSIRO Publishing on behalf of the Royal Society of Victoria. This is an open access article distributed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License (CC BY-NC-ND)

Abstract

Poorly exposed and partly metamorphosed marine clastic sediments of the Broadford Formation and other units of Siluro-Devonian age occur in the Yea area of central Victoria, Australia. Numerous localities within the Yea area are reported in this study to contain brachiopod species in the family Notanopliidae, including Boucotia australis and Septaparmella plentiensis, and other associated fossils. A biostratigraphic scheme first proposed by M.J. Garratt and based mainly on notanopliids is widely used in central Victoria. Application of this scheme now results in confirmation of the age of the Broadford Formation in the Yea area as Pridoli–Lochkovian, with most of the unit being of Early Devonian age. This contrasts with earlier studies which claimed a late Silurian (?Wenlock–Pridoli) age based on reported occurrences of graptolites associated with the early Baragwanathia flora of the so-called Lower Plant Assemblage. It is concluded that at least some of the Lower Plant Assemblage localities are Early Devonian, but in other cases direct evidence from brachiopod biostratigraphy is lacking.

Keywords: Baragwanathia, biozones, brachiopods, Broadford Formation, Early Devonian, early land plants, late Silurian, Yea.

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