http://news.sciencemag.org/sciencenow/2010/10/stone-age-toolmakers-surprisingl.html?ref=hp

"A new study suggests that cave dwellers were using a delicate stone-carving technique called pressure flaking 75,000 years ago, 55,000 years before scientists thought the technique was invented. And there are hints that pressure flaking might reach back even further in time."