The stratigraphy of the Koobi Fora Formation is one of the best studied and calibrated in East Africa. Controversial dating of the KBS Tuff during the 1970s helped to spearhead the development of modern potassium/argon and argon/argon geological dating methods. In addition, the unique fusion between geochronology and mammal evolutionary studies has made the Koobi Fora Formation a standard for all of Pliocene-Pleistocene Africa.