Discovery of 49,000-year-old cave dwelling in Australia opens debate

By Colin Packham SYDNEY (Reuters) - The discovery of a human settlement in Australia dating back 49,000 years has challenged theories about when the world's oldest continued civilization came to the country, the archaeologist who made the find said on Thursday. Sophisticated tools and bone fragments from the largest ever marsupial were found in a cave high on a cliff in Flinders Ranges, in South Australia, according to archaeologist Giles Hamm. Aboriginal Australians are the oldest continued civ