Polished fossil Oncolite. ONC111 black conglomerate TI301 Tiger Iron slab

TI301   Tiger Iron slab

115 mm x 110 mm x 10 mm thick

Weighs: 814 grams

Dimensions at widest points approximately 95 mm x 70 mm x 50 mm thick

Polished fossil Oncolite. ONC111 black conglomerate TI301 Tiger Iron slabONC111. 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. 140 mm x 100 mm x 6. 5 mm thick. Weighs 204 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