Explanation:

Rocks in Western Australia date from 4,300 million years ago, only 300 million years after the earth was formed. These are Zircon stones. Confirmation of the zircon age holds enormous implications for models of early Earth. Trace elements in the oldest zircons from Australia's Jack Hills range suggest they came from water-rich, granite-like rocks such as granodiorite or tonalite, other studies have reported.