Polished fossil stromatolite slab. Asperia ashburtonia. ASP149 asperia ashburtonia Dimensions at widest points approximately

Dimensions at widest points approximately 375 mm x 240 mm x 15

The environment they grew in was possibly freshwater algal marshes

From near Kennedy Ranges

Face is approximately 105mm x 50mm and  7mm thick

160 mm x 130 mm x 7 mm thick

Polished fossil stromatolite slab. Asperia ashburtonia. ASP149 asperia ashburtonia Dimensions at widest points approximatelyASP149. 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. 150 mm x 90 mm x 6. 5 mm thick. It weighs 240 grams.