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. 90mm x 80mm x 12mm thick.This piece has a smattering of tiny pyrite inclusions through it. Rare.