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A Darriwilian (Middle Ordovician) bivalve-dominated molluscan fauna from the Stairway Sandstone, Amadeus Basin, central Australia

Jakobsen, K.G.; Brock, G.A.; Nielsen, A.T.; Harper, D.A.T.

A Darriwilian (Middle Ordovician) bivalve-dominated molluscan fauna from the Stairway Sandstone, Amadeus Basin, central Australia Thumbnail


Authors

K.G. Jakobsen

G.A. Brock

A.T. Nielsen



Abstract

A bivalve-dominated molluscan fauna is described from the Darriwilian (Middle Ordovician) Stairway Sandstone, Amadeus Basin, central Australia. The fauna comprises 16 species of bivalves and rostroconchs plus six gastropod species which are treated under open nomenclature. Two new bivalves, Sthenodonta paenesymmetrica sp. nov. and Modiolopsis pojetai sp. nov., are described. The relatively low-diverse molluscan fauna constitutes around 62% of the total benthic macrofauna. Approximately 75% of the molluscs comprise bivalves, especially nuculoids, which were biogeographically restricted to low latitudes during the Ordovician. The molluscan assemblage displays a very high degree of endemism at species level, though the bivalve Sthenodonta eastii also occurs in the Georgina Basin farther to the northeast. This indicates a possible marine connective seaway between the Georgina and Amadeus basins during the Darriwilian. Nuculites, Cyrtodonta, and Modiolopsis are cosmopolitan and previously reported from North China, Avalonia, and Southern Gondwana.

Citation

Jakobsen, K., Brock, G., Nielsen, A., & Harper, D. (2016). A Darriwilian (Middle Ordovician) bivalve-dominated molluscan fauna from the Stairway Sandstone, Amadeus Basin, central Australia. Acta Palaeontologica Polonica, 61(4), 897-924. https://doi.org/10.4202/app.00215.2015

Journal Article Type Article
Acceptance Date Apr 13, 2016
Online Publication Date May 31, 2016
Publication Date May 31, 2016
Deposit Date May 31, 2016
Publicly Available Date May 31, 2016
Journal Acta Palaeontologica Polonica
Print ISSN 0567-7920
Electronic ISSN 1732-2421
Publisher Instytut Paleobiologii
Peer Reviewed Peer Reviewed
Volume 61
Issue 4
Pages 897-924
DOI https://doi.org/10.4202/app.00215.2015

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Publisher Licence URL
http://creativecommons.org/licenses/by/4.0/

Copyright Statement
Advance online version Copyright © 2016 K.G. Jakobsen et al. This is an open-access article distributed under the terms of the Creative Commons Attribution License (for details please see creativecommons.org), which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.




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