Polished fossil Oncolite slab. ONC113 Jasper BM327 Brecciated Mookaite rock

BM327  Brecciated  Mookaite rock

polymictic

Pilbara region

Each piece approximately 3 - 4 cm at widest points

Dimensions at widest points approximately 195 mm x 100 mm x 60 mm thick

Polished fossil Oncolite slab. ONC113 Jasper BM327 Brecciated Mookaite rockONC113. 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