SPF113. Fossil stromatolite . Rough rock with natural back, cut and polished on one side.
These are the oldest known fossils on Earth.
From the Strelley Pool Formation in the Pilbara region of Western Australia.
Age is approx. 3.4 billion years.
Dimensions approx. 100 mm x 95 mm x 30 mm thick.
Weighs 808 grams.