sentences:  This was the first time such a feat had been accomplished in intact ocean crust and was ranked by Discover Magazine as one of the top eight Earth Science stories of 2006.In 2007, Banerjee, now with the University of Western Ontario (UWO), led at team of Canadian scientists that announced the discovery of the "oldest indisputable evidence of life on Earth—the fossilized trackways of slithering microbes in a 3.35-billion-year-old rock from Australia.The Australia research, for the first time, used a laser-plasma mass spectrometer at the University of Alberta to precisely target tiny minerals and organic residues.