Re: Dating of 1470

11 Jul 1995 13:21:26 GMT

Samuel H Hazleton V ( wrote:
: 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?

1.89 MYr. "The stratigraphy of the Koobi Fora Formation was long
misunderstood, and a spurious date of 2.6 MA for the key KBS Tuff also
retarded the understanding of the site. The latest information on the
Tuff sequence and dating, and the Omo Tuffs to which they correspond, is
given by Brown et al. (1985b) and McDougall (1985): ....
-------------- disconformity
Lorenyang, KBS: 1.88 +/- 0.02 ( = Shungura H2);" (Groves, A Theory
of Human and Primate Evolution, Clarendon, 1991)

Harry Erwin
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PhD student in comp neurosci: "Glitches happen" & "Meaning is emotional"