Microfossils from a newly discovered Precambrian stromatolitic iron formation in Western Australia

THE Nabberu Basin is a newly discovered sedimentary basin of probable early Proterozoic age in Western Australia 1–3 (Fig. 1). It covers an area of ∼60,000 km 2 , and contains ∼6,000 m of shallow-water clastic and chemical sediments. It is essentially unmetamorphosed in the south-east but is metamorphosed to granulite facies in the west, where folding and deformation are more pronounced.