About two million years ago in what is Olduvai Gorge dramatically changed climate: drought alternated with wet periods. The researchers suggest that this may have influenced the evolution of human ancestors.
Scientists examined sediments that formed in a long time in the lakes of Olduvai Gorge. Tracked how changes in sediment over time the composition of organic wax that covers the leaves of plants, scientists have concluded that the local ecosystem there were sharp fluctuations in climate. Read the rest of this entry »