Shelly fauna from the Cambrian (Miaolingian, Guzhangian) Shannon Formation and the SPICE event in the Amadeus Basin, Northern Territory

Smith, Patrick M; Brock, Glenn A; Paterson, John R

doi:10.1080/03115518.2019.1660405

Author(s)

Smith, Patrick M

Brock, Glenn A

Paterson, John R

Publication Date

2019-10-01

Abstract

A low-diversity assemblage of linguliformean brachiopods, hyoliths, molluscs, bradoriid arthropods and echinoderms (ten taxa in total) is documented from the upper Shannon Formation (Cambrian, Miaolingian, Guzhangian; Mindyallan) in the Ross River Syncline and Todd River Anticline area, NE Amadeus Basin, central Australia. Taxa described include: the linguliformean brachiopods Treptotreta jucunda Henderson & MacKinnon, 1981, Opisthotreta sp., Stittia? sp., an undetermined acrotretid and an undetermined linguloid; the molluscs Kobayashiella? heritagensis Webers, Pojeta & Yochelson, 1992 (a paragastropod), and Apoptopegma joyceae sp. nov. (a rostroconch); the bradoriid Mongolitubulus sp.; Hyolithida gen. et sp. indet.; and isolated echinoderm plates. All fauna (including previously documented trilobites) from the upper Shannon Formation disappear at the beginning of a ∼5‰ positive shift in δ13C, identified as the Steptoean Positive Isotopic Carbon Excursion (SPICE). Despite previous links between SPICE and a global extinction, as well as the disappearance of all faunal elements in the uppermost Shannon Formation, certain taxa reported herein range through the event elsewhere in the world. The occurrence of Treptotreta jucunda and Kobayashiella? in younger (Furongian) deposits indicates these species survived the SPICE extinction event. This study advocates for more systematic and comprehensive sampling through stratigraphic intervals where the SPICE event occurs, especially for range data of complete faunas (rather than individual taxonomic groups), to facilitate a more complete picture of diversity trends through this important phase.

Citation

Alcheringa: An Australasian Journal of Palaeontology, 44(1), p. 1-24

ISSN

1752-0754

0311-5518

Link

https://hdl.handle.net/1959.11/30293

Language

en

Publisher

Taylor & Francis

Title

Shelly fauna from the Cambrian (Miaolingian, Guzhangian) Shannon Formation and the SPICE event in the Amadeus Basin, Northern Territory

Type of document

Journal Article

Entity Type

Publication

Author(s)	Smith, Patrick M Brock, Glenn A Paterson, John R
Publication Date	2019-10-01
Abstract	A low-diversity assemblage of linguliformean brachiopods, hyoliths, molluscs, bradoriid arthropods and echinoderms (ten taxa in total) is documented from the upper Shannon Formation (Cambrian, Miaolingian, Guzhangian; Mindyallan) in the Ross River Syncline and Todd River Anticline area, NE Amadeus Basin, central Australia. Taxa described include: the linguliformean brachiopods <I>Treptotreta jucunda</I> Henderson & MacKinnon, 1981, <I>Opisthotreta</I> sp., <I>Stittia?</I> sp., an undetermined acrotretid and an undetermined linguloid; the molluscs <I>Kobayashiella? heritagensis</I> Webers, Pojeta & Yochelson, 1992 (a paragastropod), and <I>Apoptopegma joyceae</I> sp. nov. (a rostroconch); the bradoriid <I>Mongolitubulus</I> sp.; Hyolithida gen. et sp. indet.; and isolated echinoderm plates. All fauna (including previously documented trilobites) from the upper Shannon Formation disappear at the beginning of a ∼5‰ positive shift in δ13C, identified as the Steptoean Positive Isotopic Carbon Excursion (SPICE). Despite previous links between SPICE and a global extinction, as well as the disappearance of all faunal elements in the uppermost Shannon Formation, certain taxa reported herein range through the event elsewhere in the world. The occurrence of <I>Treptotreta jucunda</I> and <I>Kobayashiella? </I> in younger (Furongian) deposits indicates these species survived the SPICE extinction event. This study advocates for more systematic and comprehensive sampling through stratigraphic intervals where the SPICE event occurs, especially for range data of complete faunas (rather than individual taxonomic groups), to facilitate a more complete picture of diversity trends through this important phase.
Citation	Alcheringa: An Australasian Journal of Palaeontology, 44(1), p. 1-24
ISSN	1752-0754 0311-5518
Link	https://hdl.handle.net/1959.11/30293
Language	en
Publisher	Taylor & Francis
Title	Shelly fauna from the Cambrian (Miaolingian, Guzhangian) Shannon Formation and the SPICE event in the Amadeus Basin, Northern Territory
Type of document	Journal Article
Entity Type	Publication

Shelly fauna from the Cambrian (Miaolingian, Guzhangian) Shannon Formation and the SPICE event in the Amadeus Basin, Northern Territory

Files: