HUMANPAST.NET

Environment                  1 Million BC
Africa
Southwest Asia
Egypt
Indus Valley
China
Europe
South America
Mesoamerica
North America
Other

In General


Homo erectus was the first hominid to invade temperate climates and may have been more widely distributed than is represented here. Land bridges, now submerged, fascilitates Homo erectus movements.(10)

It is an inescapable fact of genetics that all people alive in the world are genetically related, and that at some point an individual existed whom we all claim as an ancestor. The only points of debate are how long ago that ancesor lived, and where. DNA data suggests all modern humans are genetic descendants of one small inbred group of prehistoric Africans.(18)

The "Total Replacement," "African Origins," or "Eve" model contends that modern humans evolved first and only in Africa and only a few hundred thousand years ago or less, and then migrated to the rest of the world, displacing all other hominid forms, and with little or no genetic interchange between them. If this is true, then, as interesting as those many European and Asian fossils and sites of hundreds of thousands of years ago are, the people who left these remains had almost nothing to do with us in terms of our physical or cultural heritage. This is a difficult premise for many anthropolgists to accept, because so much of what we know about human evolution has been based on sites such as Zhoukoudian, in China, Toralba-Ambrona, in Spain, etc.

Alternatively, the "Multiregional Evolution," "Continuity," or "Candelabra" models propose that: sometime between about 1 million and 2 million years ago a generic Homo ancestor or ours spread out across the warmer latitudes of Africa, the Middle East, Asia, and possibly the southernmost fringe of Europe; then, with the passage of the millennia, although these groups began to diverge somewhat as they adapted to local and different environments, across the whole range of Homo they were evolving toward Homo spaiens as a result of gene flow that connected all human groups to some extent and because they were all under similar evolutionary selective forces as genralized hunter-foragers; so they all converged at about 30,000 years ago as one species, Homo sapiens--but with the physical differencess that distinguish modern Europeans from, for example, modern Chinese.(18)

Today the north pole is positive and the south pole is negative, but these were reversed in some periods, such as for most of the period between about 700,000 and 1.6 million years ago.()

Within the Pleistocene alone - approximately the last two million years - there have been eight magnetic reversals, four normal and four reversed. They are named after either their discoverers, as in the Matuyama-Brunhes at 730,000 years ago, or after places, as in the Olduvai event beginning at 1,880,000 years ago and ending at 1,660,000 years ago. Paleomagnetics offers a well-documented way of assessing where one is in time by examining either the natural remnant magnetism of a rock or the orientation of magnetic particles within sediment, and then assessing "normal" or "reversed" polarity. If one has a reliable sequence of reversals, and one knows approximately where one stands in time, then it's feasible to get an "absolute" date for a layer sandwiched between a series of reversals. The longer the sequence, the better the result. (142)

The dramatic message from the deep-sea cores was that beyond any shadow of reasonable doubt the climate of the last million years has been dominated by periodic variations in the Earth's orbital parameters that have resulted in ice ages occurring roughly every 100 kyr. Since around 400 kya the pattern has been broadly consistent. Each ice age ended rapidly, then after an interglacial that lasted only around 10 kyr, the climate slipped back into glacial conditions, giving the temperature record a characteristic sawtooth appearance. (145)

It seems clear that by 300,000 years ago humans lived across much of the Old World, from England to northern China, from South Africa to Indonesia. Some of this area, particularly Africa, had been occupied by humans for more than a million years, and people had probably lived even on the extreme periphery for many hundreds of thousands of years. It seems clear that some form of early Homo left Africa and colonized Europe and Asia between 1.0 and 0.5 million years ago.(16)

Africa


Cooling and drying intensified in a second major cold "pulse" one million years ago, as ice sheets expanded, diverting cold air from Europe toward Afria and Asia.(2)

Southwest Asia

 Cooling and drying intensified in a second major cold "pulse" one million years ago, as ice sheets expanded, diverting cold air from Europe toward Afria and Asia.(2)

Egypt

 

Indus Valley

 

China

 

Europe

About 3.2 Million years ago, when some of our first bipedal ancestors appeared, massive glaciers had spread over northern lands. These glaciers had grown even larger by 2.5 million years ago, and about 1.6 million years ago, when our earliest ancestors were radiating from Africa, climates began fluctuating, with long periods of intense cold folowed by periods that were nearly as warm as climates of today.(5)

Cooling and drying intensified in a second major cold "pulse" one million years ago, as ice sheets expanded, diverting cold air from Europe toward Afria and Asia.(2)

Some scholars believe that humans colonized most of temperate Europe only after 500,000 years ago, but that recent human fossils found in Spain, at Cueva Victoria and Gran Dolina, "suggest that humans colonized most of Europe nearer to 1 million years ago."(14)

South America

 

Mesoamerica

 

North America

Cooling and drying intensified in a second major cold "pulse" one million years ago, as ice sheets expanded, diverting cold air from Europe toward Afria and Asia.(2)

Other