Polished fossil Oncolite. ONC109 polished noreena Dimensions at widest points approximately

Dimensions at widest points approximately 115 mm x 100  mm x 18 mm thick

beautiful palm stone

Dimensions at widest points approximately 235 mm x 85  mm x 9 mm thick

255 mm x 105 mm  x 12 mm

From the Jeerinah Formation in the Hamersley Ranges

Polished fossil Oncolite. ONC109 polished noreena Dimensions at widest points approximatelyONC109. 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