New tests show that the aboriginal rock carvings already considered the world's oldest are even older than first believed - up to 45,000 years old, geologists said Thursday.

Scientists had originally thought the tens of thousands of aboriginal carvings scattered through a remote area of South Australia state ranged in age from 1,400 to 31,000 years old.But new tests conducted by Adelaide rock expert Margaret Nobbs and Ronald Dorn, a geology professor from Arizona State University in the United States, show the carvings to be between 36,000 and 45,000 years old.