Isuasphaera isua (Pflug) revisited

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

Publikation: Bidrag til tidsskriftArtikelForskningpeer review

14 Citationer (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.

Sider (fra-til)309-312
Antal sider4
TidsskriftPrecambrian Research
Udgave nummer3-4
StatusUdgivet - 10 okt. 2003


  • Programområde 4: Mineralske råstoffer


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