Polished fossil stromatolite. Domal from Irregully formation IRR129

IRR 129    Fossil stromatolite slab, polished on one side.

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

 Not formally identified but possibly Paniscollenia.

Dimensions at widest points approximately 180 mm x 90 mm x 11 mm thick.

It weighs 368 grams..