Isuasphaera isua (Pflug) revisited

Peter W.U. Appel, Stephen Moorbath, John S. Myers

Research output: Contribution to journalArticleResearchpeer-review

14 Citations (Scopus)


Spherical objects, identified as microfossils and named Isuasphaera isua (Pflug), were reported in 1978 from a chert in the 3.7-3.8 Ga Isua Greenstone Belt (IGB). Soon afterwards the biological nature of these objects was questioned on a number of grounds by several authors.

Following renewed, recent claims for biogenicity, the locality has been revisited and the host-rock (metamorphosed chert) to the putative microfossils re-examined. Extreme stretching deformation of the metachert cannot possibly have preserved syn-depositional spherical objects. We conclude that the objects (whether biological or not) are entirely post-tectonic and probably result from pre-Quaternary weathering.

Original languageEnglish
Pages (from-to)309-312
Number of pages4
JournalPrecambrian Research
Issue number3-4
Publication statusPublished - 10 Oct 2003


  • Isua Greenstone Belt
  • Isuasphaera isua
  • Microfossils

Programme Area

  • Programme Area 4: Mineral Resources


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