Dating of 1470

Samuel H Hazleton V (
Mon, 10 Jul 1995 00:36:58 GMT

I understand that KNM-ER 1470 was originally dated at 2.9 million years
by Richard Leakey due to separate analyses that agreed (Fitch & Miller, Maglio)

Why were these analyses rejected? What led to the consensus for the present
dating of 1.8 million years?