ISBN: | 978-5-5136-1459-3 |
High Quality Content by WIKIPEDIA articles! The Tumblagooda sandstone is a geological formation deposited during the Silurian or Ordovician periods, around four to five hundred million years ago, and is now exposed on the west coast of Australia, straddling the boundary of the Carnarvon and Perth basins. Visible trackways may prove to be the earliest evidence of terrestrial animals.