Polished fossil Oncolite. ONC109 black conglomerate It weighs 174 grams

It weighs 174 grams

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Dimensions at widest points approximately 290 mm  x 170 mm x 9 mm thick

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Polished fossil Oncolite. ONC109 black conglomerate It weighs 174 gramsONC109. 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. 150 mm x 65 mm x 6. 5 mm thick. Weighs 117 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