Polished fossil stromatolite slab. Asperia ashburtonia. ASP158 Marra Mamba Dimensions at widest points approximately

Dimensions at widest points approximately 60 mm x 50 mm x 38 mm thick

80 mm x 70 mm x 25 - 30 mm thick

Dimensions at widest points approximately 220 mm x 140  mm x 10 mm thick

180 mm x 80 mm x 9 mm thick

Dimensions at widest points approximately 125 mm x 65 mm x 11 mm thick

Polished fossil stromatolite slab. Asperia ashburtonia. ASP158 Marra Mamba Dimensions at widest points approximatelyASP158. 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. 215 mm x 100 mm x 8 mm thick. It weighs 432 grams.