Polished fossil Oncolite slab. ONC115 asperia ashburtonia Weight : 168 grams

Weight :  168 grams

From near Norseman in the Eastern Goldfields region of Western Australia

Dimensions at widest points approximately 80 mm x 40 mm x 16 mm thick

Approximate dimensions at widest points 130 mm  x 115 mm  x 12

EU105  4 pieces of Eucryptite rough rock

Polished fossil Oncolite slab. ONC115 asperia ashburtonia Weight : 168 gramsONC115. Fossil Oncolite polished slab. From the Miocene "Trealla Limestone" north of Carnarvon, Western Australia . Age is approx. 15 million years. Dimensions at widest points approx. 170 mm x 70 mm x 7. 5 mm thick. Weighs 211 grams. Oncolite is a limestone composed largely of oncoidsrounded, coated grains that grow as thin layers of lime mud accumulate around a tiny nucleus (such as a sand grain or shell fragment) under microbial influence. Formed