Polished fossil Oncolite slab. ONC112 ashburton agate TI369 Tiger Iron rough rock

TI369   Tiger Iron rough rock

160 mm x 110 mm x 90 mm

Weighs 387 grams

Dimensions at widest points approximately 110 mm x 45 mm x 7 mm thick

Polished fossil Oncolite slab. ONC112 ashburton agate TI369 Tiger Iron rough rockONC112. 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. 145 mm x 105 mm x 8 mm thick. Weighs 285 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