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PP120. Fossil stromatolite with natural rough back, polished on one side.
Pilbaria perplexa from the Proterozoic "Duck Creek Dolomite".
Age is approx. 2 billion years.
From near Paraburdoo in Western Australia.
Approx. 370 mm x 180 mm x 20 - 40 mm thick.
Weighs 3,708 grams.