Supplemental material: K-Ar and <sup>40</sup>Ar/<sup>39</sup>Ar dating of the hominid-bearing Plio-Pleistocene sequence at Koobi For a, Lake Turkana, northern Kenya McDougallI. 1985 GSA Data Repository Item 8507, GSA Bulletin, Vol. 96, p. 159. File size: 5 p., about 250 K bytes.