Partial cranium of Cercopithecoides kimeui Leakey, 1982 from Rawi Gully, southwestern Kenya.

Fossil Cercopithecidae from the Hadar Formation and surrounding areas of the Afar Depression, Ethiopia.

Hadar is well known as one of the most productive early hominin sites in the world. Between 1972 and 1994 a large sample of fossil cercopithecid specimens was collected from Hadar and the nearby sites of Geraru, Ahmado, and Leadu. At least five, and possibly six, species are present in the sample, including two chronological subspecies of Theropithecus oswaldi. T. o. cf. darti is known from the...

Koobi Fora Research Project , Volume 6 : The Fossil Monkeys

A cercopithecoid primates first evolved in the latter part of the Miocene epoch, it was not until the Plio-Pleistocene when the two subfamilies of Old World monkeys, the colobinae and cercopithecinae, started to morphologically and ecologically diversify. This diversification is well documented in the primate fossil record, especially in the Koobi Fora Formation. In The Fossil Monkeys, which is...

The Hand of Cercopithecoides williamsi (Mammalia, Primates): Earliest Evidence for Thumb Reduction among Colobine Monkeys

Thumb reduction is among the most important features distinguishing the African and Asian colobines from each other and from other Old World monkeys. In this study we demonstrate that the partial skeleton KNM-ER 4420 from Koobi Fora, Kenya, dated to 1.9 Ma and assigned to the Plio-Pleistocene colobine species Cercopithecoides williamsi, shows marked reduction of its first metacarpal relative to...

Effect of incipient gullying mechanisms on topographic threshold conditions for gully initiation in southwestern Iran

Urban Gully Development in Southwestern Nigeria

This study examined the development of urban gullies in a part of Southwestern Nigeria. This was done with a view to determine the volume and amount of sediment loss from the 1 and 2 order gullies in a cascade system. Twenty (20) towns were randomly selected from where thirty (30) gully systems comprising forty (40) 1 order and five (5) 2 order gullies were measured with Tape and Total Station ...