Polished fossil Oncolite. ONC109 polished noreena 54 pieces of rough Mookaite

54 pieces of rough Mookaite

Weighs 146 grams

80 mm x 55 mm  x 8 mm

Dimensions at widest points approximately 100 mm x 100 mm x 90 mm thick

SD156 Stromatolitic Dolomite slab

Polished fossil Oncolite. ONC109 polished noreena 54 pieces of rough MookaiteONC109. 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