The rugged and remote Pilbara region, located about 1,300 kilometres north of Perth, Australia and covering some 500,000 square kilometres of land, is one of Australia's most fascinating places with traces of Earth's earliest life. This Burrup petroglyph may be one of the oldest carved faces in the world [Credit: Ken Mulvaney] The ancient Pilbara's 2.5 billion year old landscape keeps many prehistoric secrets. Some of them have recently been unveiled by reseachers working in the area…