Polished fossil Oncolite. ONC110 Orbicular Granite 165 mm x 120 mm
Description
165 mm x 120 mm x 25 mm
OJ199 A rough rock
Weighs 883 grams
POP195 Brecciated Pink Opal slab
Polished fossil Oncolite. ONC110 Orbicular Granite 165 mm x 120 mmONC110. 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. 125 mm x 70 mm x 8 mm thick. Weighs 172 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
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