Polished fossil Oncolite slab. ONC116 toredo Big palm stone

Big palm stone

190 mm x 190 mm x 70 mm

Magnesite (Lemon chrysoprase) rough rock

CLA263   Australian Crazy Lace Agate slab

One edge slightly unpolished

Polished fossil Oncolite slab. ONC116 toredo Big palm stoneONC116. 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. 105 mm x 85 mm x 7 mm thick. Weighs 134 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