There are several submerged (underwater) lands in the Indian Ocean, off the west of Australia. They are under more than of water. Their rocks show that they used to be part of Gondwana. They are not the type of rocks that are usually found in the ocean, like basalt. Instead, they are typical land rocks, like granite, sandstone, and gneiss. They also have the type of fossils that are now found on continental areas. Recently, two of these sunken islands were found to the west of Perth, Western Australia. These islands are almost the size of Tasmania, and have flat tops. This shows they were once at sea level before being submerged underwater. It also shows that when India began to break away from Australasia in the early Cretaceous period, the islands formed part of the last link between the two present-day continents.