Polished fossil stromatolite. Domal from Irregully formation IRR132

IRR 132    Fossil stromatolite slab, polished on one side.

Totally replaced by colourful chert !

From the Proterozoic "Irregully Formation", age approx. 1.1 billion years.    

Dimensions at widest points approximately 160 mm x 150 mm x 19 mm thick.

It weighs 546 grams..