Proponents of the model known as the “human revolution” claim that modern human
behaviors arose suddenly, and nearly simultaneously, throughout the Old World ca. 40 …

Water plays a critical role in erosion and sediment transport and this relationship is most
evident in the hyperarid Atacama Desert of Northern Chile, a region characterized by …

Abstract The 40 Ar/39 Ar dating method is among the most versatile of geochronometers,
having the potential to date a broad variety of K-bearing materials spanning from the time of …

Previous research suggests that the complex symbolic, technological, and socioeconomic
behaviors that typify Homo sapiens had roots in the middle Pleistocene< 200,000 years ago …

The 40Ar/39Ar dating method depends on accurate intercalibration between samples,
neutron fluence monitors, and primary 40Ar/40K (or other external) standards. The …

The spectacular fossil fauna and flora preserved in the Upper Cretaceous terrestrial strata of
North America's Western Interior Basin record an exceptional peak in the diversification of …

Abstract The Oldowan Stone tool industry was named for 1.8-million-year-old (Myr) artefacts
found near the bottom of Olduvai Gorge, Tanzania. Subsequent archaeological research in …

Variability selection (abbreviated as VS) is a process considered to link adaptive change to
large degrees of environment variability. Its application to hominid evolution is based, in …

Development of the African Middle Stone Age (MSA) before 300,000 years ago raises the
question of how environmental change influenced the evolution of behaviors characteristic …

The study of human evolution has long sought to explain major adaptations and trends that
led to the origin of Homo sapiens. Environmental scenarios have played a pivotal role in this …