Geologists say they have discovered a large meteorite crater in outback Western Australia, which could be up to five times bigger than the famous Wolfe Creek Crater in the state's remote north.
The ABC reports, the impact crater was located near the historic Goldfields mining town of Ora Banda, north-west of Kalgoorlie-Boulder, while drilling for gold.
It is not visible from the surface but electromagnetic surveys, which map the rocks below, suggest the crater has a diameter of around 5km.
Perth-based geologist and geophysicist, Jayson Meyers, said the asteroid that made the crater would have been at least 100m wide.
"Based on its position and levels of erosion and some of the soil that is filling the sides, we estimate it could be around 100 million years old," Dr Meyers told the ABC.
The crater is located about 10km southeast of Ora Banda, on land owned by Australia's third-biggest gold miner, Evolution Mining.
Dr Meyers, who has more than 30 years' experience in the field and is an adjunct Associate Professor in exploration geophysics at the WA School of Mines, was brought in as a geological consultant.
The California native said close inspection of drilling samples from the site have convinced him.
He said the rock samples had "tell-tale signs" of a meteorite strike, including what is known as "shatter cones", which under a microscope look like shattered glass and form in a certain direction.