Fossil stromatolite slab, polished on one side .
Alcheringa narrina from the Archaean Meentheena Member within the Tumbiana Formation.
Age is approx. 2.7 billion years.
From near Nullagine in Western Australia.
Approx. 100mm x 75mm x 7mm thick.
This piece has a "little constellation" of pyrite inclusions through it, some cubic, some triangle. Rare. Lovely little specimen!