Polished fossil Oncolite slab. ONC112 microbialite no thicker than 250mm that

no thicker than 250mm that cross cuts the Weeli Wolli formation

It comes from near Newman in the Pilbara region of Western Australia

55 mm x 40 mm  x 16 mm

TI304   Tiger Iron slab

Polished fossil Oncolite slab. ONC112 microbialite no thicker than 250mm thatONC112. 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. 145 mm x 105 mm x 8 mm thick. Weighs 285 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 in