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PSP107. Fossil stromatolite slab, polished on one side.
Pilbaria sp. from the Proterozoic "Duck Creek Dolomite".
Age is approx. 2 billion years.
From near Paraburdoo in Western Australia.
At widest points approx. 220 mm x 125 mm x 9 mm thick .
Weighs 522 grams.