Polished fossil stromatolite. Alcheringa narrina. ALC161 Noreena Oncolite is a limestone composed

Oncolite is a limestone composed largely of oncoids—rounded

Dimensions approximately 195 mm x 60 mm x 60 mm thick

Weight 985 grams

Dimensions at widest points approximately 160 mm x 100 mm x 75 mm thick

Weighs 670 grams

Polished fossil stromatolite. Alcheringa narrina. ALC161 Noreena Oncolite is a limestone composedALC160 Fossil stromatolite , polished on one side with natural weathered exterior on rear. Alcheringa narrina from the Archaean Meentheena Member within the Tumbiana Formation. Age is approx. 2. 7 billion years. From near Nullagine in Western Australia. Dimensions at widest points approx. 135 mm x 80 mm x 40 mm thick. Weighs 584 grams.