Acheulean culture

Cranial capacity had again doubled within the Homo genus by six hundred thousand years ago, from H. habilis to an archaic Homo species called Homo heidelbergensis, the second human wave to be pumped from Africa into the Middle East and Western Europe.

Sites such as Boxgrove in Sussex illustrate the later arrival in the archaeological record of heidelbergensis around five hundred thousand years ago.

The cranial capacity of H. heidelbergensis overlaps with the range found in modern humans; these early peoples make Acheulean flint tools (hand axes) and hunt the large native mammals of the period.

They are thought to have driven elephants, rhinoceroses, and hippopotamuses over the tops of cliffs or into bogs to kill them more easily.

Up until the 1970s, these kill sites, often at waterholes where animals would gather to drink, were interpreted as being where Acheulean tool users killed game, butchered their carcasses, and then discarded the tools they had used.

Since the advent of zooarchaeology, which has placed greater emphasis on studying animal bones from archaeological sites, this view has changed.

Many of the animals at these kill sites have been found to have been killed by other predator animals, so it is likely that humans of the period supplemented hunting with scavenging from already dead animals.

The extreme cold of the Anglian Stage, from four hundred and seventy-eight thousand to four hundred and twenty-four thousand years ago, is likely to have driven humans out of Britain altogether and the region will apparently be unoccupied until the ice recedes during the Hoxnian Stage.

Britain first becomes an island about three hundred and fifty thousand years ago, near the beginning of the Wolstonian stage, named after the site of Wolston in the English county of Warwickshire where corresponding deposits were first identified.

This period sees the introduction of Levallois flint tools, possibly by humans arriving from Africa, although finds from Swanscombe and Botany Pit in Purfleet support Levallois technology as a European rather than African introduction.

This more advanced flint technology, which made hunting more efficient, therefore made Britain a more worthwhile place to remain until the increasingly cool climate of the Wolstonian Stage, which apparently includes three periods of glaciation, made continued habitation unattractive, if not impossible.

Acheulean flint tools, typically found with Homo erectus remains, have been found in Wolstonian deposits.

The beginning of the last Ice Age is conventionally dated at about one hundred and twenty thousand BCE with the onset of the Abbassia Pluvial, an extended wet and rainy period in the climate history of North Africa.

The Abbassia Pluvial, which lasted approximately thirty thousand years, and ended around ninety thousand ybp, spanned the end of the Lower Paleolithic and the start of the Middle Paleolithic eras—an interval that is also sometimes identified as the Acheulean (two hundred and fifty to ninety kybp).

As with the subsequent Mousterian Pluvial (circa fifty to thirty kybp), the Abbassia was brought about by global climate changes associated with the ice ages and interglacials of the Pleistocene Epoch.

Like the Mousterian Pluvial, the Abbassia Pluvial brought wet and fertile conditions to what is now the Sahara Desert, which bloomed with lush vegetation fed by lakes, swamps, and river systems, many of which later disappeared in the drier climate that followed the pluvial.

During this period, African wildlife now associated with the grasslands and woodlands south of the Sahara penetrated the entire North African.

Human Stone Age cultures—notably the Mousterian and Aterian Industries—flourished in Africa during the Abbassia Pluvial.

The shift to harsher climate conditions that came with the end of the pluvial promoted the emigration of modern Homo sapiens out of Africa and over the rest of the globe.

This was the third wave of the Sahara pump cycle.