Polished fossil Oncolite slab. ONC113 Noreena POP162 Pink Opal slab

POP162   Pink Opal slab

Dimensions at widest points approximately 180 mm x 130 mm x 70 mm thick

sunlit waters with gentle movement

Dimensions at widest points approximately 260 mm  x 170 mm x 12 mm thick

Weight is 243 grams

Polished fossil Oncolite slab. ONC113 Noreena POP162 Pink Opal slabONC113. 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. 165 mm x 160 mm x 9 mm thick. Weighs 449 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