Polished fossil stromatolite slab. Asperia digitata YD117 John Rain Forest Jasper 200 mm x 100 mm

200 mm x 100 mm x 11 mm

250 mm x 140 mm x 12

iron-rich silica rock from the Marble Bar Chert Member (Warrawoona Group) of Western Australia

Dimensions at widest points approximately 200 mm x 65 mm x 7 mm thick

Dimensions at widest points approximately 140 mm x 30 mm  x 9 mm thick

Polished fossil stromatolite slab. Asperia digitata YD117 John Rain Forest Jasper 200 mm x 100 mmYD117. Fossil stromatolite slab polished on one side. Asperia digitata (formerly Yelma digitata) from the Proterozoic "Yelma Formation". Age is approx. 1. 7 billion years. From near Wiluna in Western Australia. Dimensions approx. 305 mm x 170 mm x 12. 5 mm thick. Weighs 1,688 grams.