Olduvai Gorge
Deocampo, Daniel M.,  Blumenschine, R.J., and Ashley, G.M. (2002). "Freshwater wetland diagenesis and traces of early hominids in the lowermost Bed II (~1.8 myr) playa lake-margin at Olduvai Gorge, Tanzania."  Quaternary Research, vol. 57, p. 271-281.