Ancient soil provides a window to the past
(PHYSorg.com Archaeology & Fossils)

Noelle Purcell, a senior in the Columbian College of Arts and Science, spent the first half of her summer in northern Kenya trying to better understand the environmental context of human evolution by studying the morphology of preserved ancient soils called paleosols. The preserved ancient soils contain information about atmospheric composition, which sheds light on what the Earth`s environment was like in the past.