Stromatolitic Dolomite SD154 dolomite Dimensions approximately 180 mm x

Dimensions approximately 180 mm x 65 mm x 6 mm thick

Fossil stromatolite polished slab

70 million years (Cretaceous)

2 billion years

220 mm x 160 mm x 10 mm thick

Stromatolitic Dolomite SD154 dolomite Dimensions approximately 180 mm xSD154 Stromatolitic Dolomite rough rock, cut and polished on one side. Sections consist of a chaotic mixture of dolomite and or stromatolite fragments set in a matrix of mudstone and or coarsely crystalline dolomite . The pink and red colouration can be attributed to the presence of finely disseminated iron oxides . It often contain layers and nodules of red chert. From the Irregully Formation, Western Australia. Dimensions approximately 170mm x 45mm