DiscoidaL Impressions and Trace-Like Fossils More Than 1200 Million Years Old

Birger Rasmussen, S. Bengtson, I.R. Fletcher, Neal Mcnaughton

    Research output: Contribution to journalArticle

    112 Citations (Scopus)


    The Stirling Range Formation of southwestern Australia contains discoidal impressions and trace-like fossils in tidal sandstones. The various disks have previously been linked to the Ediacaran biota, younger than 600 million years old. From this unit, we report U-Th-Pb geochronology of detrital zircon and monazite, as well as low-grade metamorphic monazite, constraining the depositional age to between 2016+/-6 and 1215+/-20 million years old. Although nonbiological origins for the discoidal impressions cannot be completely discounted, the structures resembling trace fossils clearly have a biological origin and suggest the presence of vermiform, mucus-producing, motile organisms.
    Original languageEnglish
    Pages (from-to)1112-1115
    Publication statusPublished - 2002


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