ASP161 Fossil stromatolite slab, polished on one side.
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. 225 mm x 200 mm x 10 mm thick. It weighs 931 grams.
