An enigmatic univalve macromollusc from the lower Cambrian (Series 2, Stage 3) Heatherdale Shale, South Australia

Sarah Jacquet, James B. Jago, Glenn A. Brock

Research output: Chapter in Book/Report/Conference proceedingChapter

Abstract

Fossils have been reported sporadically throughout the lower Cambrian Heatherdale Shale (Normanville Group), Fleurieu Peninsula, South Australia, but there has been little taxonomic documentation of faunas. Problematic cap -shaped fossils from the lower member of the formation originally attributed to Helcionella are herein formally described as a new genus and species, Tribelopoma amygdala gen. et sp. nov. The asymmetric valves with accretionary growth and probable calcium carbonate composition support a molluscan affinity, and comparisons with other enigmatic cap -shaped taxa suggest a possible helcionelloid affinity. Taphonomic processes related to early diagenesis provide evidence of a rigid shell, prone to brittle fracture during compaction.

Original languageEnglish
Title of host publicationCambro-Ordovician studies VI
EditorsJ. R. Laurie, I. G. Percival, J. B. Jago, J. R. Paterson, G. A. Brock
Place of PublicationCanberra
PublisherAustralasian Paleontologists
Pages21-30
Number of pages10
ISBN (Print)9780949466471
Publication statusPublished - 2016

Publication series

NameAustralasian Palaeontological Memoir
PublisherAustralasian Paleontologists
Volume49
ISSN (Print)2205-8877

Keywords

  • Mollusca
  • cap-shaped
  • Fleurieu Peninsula
  • Normanville Group
  • Helcionelloida
  • taphonomy

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