ASP151. Fossil stromatolite . Cut and polished on one side with natural rough exterior on rear.
Asperia ashburtonia from the Proterozoic "Duck Creek Dolomite".
Age is approx. 2 billion years.
From near Paraburdoo in Western Australia.
Dimensions at widest points approx. 295 mm x 130 mm x 40 mm thick. It weighs 2,528 grams.