Post by Dawn2Earth on Oct 4, 2010 14:49:31 GMT -5
This thread is about
Saharan Climate History
Spark of Pharaonic Civilization
(Picture above is a clickable link)
It was against the backdrop of a now diminished climatic blessing from above that mankind first realised his impetus to move on to the greener pastures of Statehood and a more citified way of life. Where there now lies the largest desert anywhere on the globe once lay an enormous Savannah, smack in the middle of which lay an expansive watershed feeding rivers that flowed all the way from the Tibesti Mountains and emptied out in the Mediterranean Sea. Prior to that Savanna the region had undergone an extremely arid phase where what inhabitants Northern Africa had lived on the Nile.
The Sahara had progressed from an earlier extremely arid phase, probably of virtually no human residence. There were now the heavily forested banks of a River Nile, which was much wider. African savanna existed in place of desert, open to moonsoon. With much of what is modern North Africa's Coastal regions likely submerged under sea, uninhabited swamps and marshes lay during this wet phase era where the modern day Sahara's population is most dense -- which is where Coastal North Africa's Delta now empties out into the Mediterranean Sea.
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When the Sahara desert as we today know it begins to manifest marks the end of this African Savannah of Eden and the beginning of humanity's first centralized governments along the Nile and Niger River Valleys, as well as elsewhere.
And population genetics seem to reflect this history:
They reference this text:
Saharan Climate History
Spark of Pharaonic Civilization
(Picture above is a clickable link)
It was against the backdrop of a now diminished climatic blessing from above that mankind first realised his impetus to move on to the greener pastures of Statehood and a more citified way of life. Where there now lies the largest desert anywhere on the globe once lay an enormous Savannah, smack in the middle of which lay an expansive watershed feeding rivers that flowed all the way from the Tibesti Mountains and emptied out in the Mediterranean Sea. Prior to that Savanna the region had undergone an extremely arid phase where what inhabitants Northern Africa had lived on the Nile.
The Sahara had progressed from an earlier extremely arid phase, probably of virtually no human residence. There were now the heavily forested banks of a River Nile, which was much wider. African savanna existed in place of desert, open to moonsoon. With much of what is modern North Africa's Coastal regions likely submerged under sea, uninhabited swamps and marshes lay during this wet phase era where the modern day Sahara's population is most dense -- which is where Coastal North Africa's Delta now empties out into the Mediterranean Sea.
"Located at the southern fringes of the Libyan Desert, Wadi Howar is the largest dry river system in the presently hyper-arid and uninhabitable Eastern Sahara, stretching over 1,100 km from its source area in eastern Chad to the Nile. Geoscientific investigations have shown that during the early Holocene this wadi was the Nile's most important tributary from the Sahara. Later, it became a chain of freshwater lakes and marshes supported by local rainfall, until it ultimately became extinct about 2,000 years ago. A once ecologically favoured area of settlement and communication route between the inner regions of Africa and the Nile valley, Wadi Howar bears abundant prehistoric sites providing evidence of important population movements and interregional cultural contacts."
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"[before 5000 B.C.] the Delta [was] virtually uninhabitable."
- Atlas of Ancient Egypt (Cultural Atlas of) - John Baines; Hardcover, page 59, ISBN: 0871963345, Publisher: Facts on File (July 1, 1980)
When the Sahara desert as we today know it begins to manifest marks the end of this African Savannah of Eden and the beginning of humanity's first centralized governments along the Nile and Niger River Valleys, as well as elsewhere.
"Before 2000 BC, what is today the southern Sahara was inhabited by significant numbers of herders and farmers. On the rocky promontories of the Tichitt-Walata (Birou) and Tagant Plateaus in modern day Mauritania, they built what are considered among the earliest known civilizations in western Africa. Composed of more than 400 stone masonry settlements, with clear street layouts, some settlements had massive surrounding walls while others were less fortified. In a deteriorating environment, where arable land and pasturage were at a premium, the population grew and relatively large-scale political organizations emerged - factors which no doubt explain the homogeneity of architecture, settlement patterns, and material culture (e.g., lithic and ceramic traditions). This agro-pastoral society traded in jewelry and semi-precious stones from distant parts of the Sahara and Sahel, while crafts, hunting, and fishing were also important economic pursuits...Their elites built funerary monuments for themselves over a period extending from 4000 to 1000 BC."
- Ray A. Kea, and Mauny, R. (1971), “The Western Sudan” in Shinnie: 66-87.
- Monteil, Charles (1953), “La Légende du Ouagadou et l’Origine des Soninke” in Mélanges Ethnologiques (Dakar: Bulletin del’Institut Francais del’Afrique Noir)
Climate-Controlled Holocene Occupation in the Sahara: Motor of Africa's Evolution
Rudolph Kuper and Stefan Kröpelin*
"Radiocarbon data from 150 archaeological excavations in the now hyper-arid Eastern Sahara of Egypt, Sudan, Libya, and Chad reveal close links between climatic variations and prehistoric occupation during the past 12,000 years. Synoptic multiple-indicator views for major time slices demonstrate the transition from initial settlement after the sudden onset of humid conditions at 8500 B.C.E. to the exodus resulting from gradual desiccation since 5300 B.C.E. Southward shifting of the desert margin helped trigger the emergence of pharaonic civilization along the Nile"
Rudolph Kuper and Stefan Kröpelin*
"Radiocarbon data from 150 archaeological excavations in the now hyper-arid Eastern Sahara of Egypt, Sudan, Libya, and Chad reveal close links between climatic variations and prehistoric occupation during the past 12,000 years. Synoptic multiple-indicator views for major time slices demonstrate the transition from initial settlement after the sudden onset of humid conditions at 8500 B.C.E. to the exodus resulting from gradual desiccation since 5300 B.C.E. Southward shifting of the desert margin helped trigger the emergence of pharaonic civilization along the Nile"
- Collaborative Research Center 389 (ACACIA), University of Cologne, Institute of Prehistoric Archaeology, Africa Research Unit, Jennerstraße 8, 50823 Köln, Germany.
And population genetics seem to reflect this history:
"A recent archaeological study reveals
that during a desiccation period in North Africa, while the
eastern Sahara was depopulated, a refugium existed on the
border of present-day Sudan and Egypt, near Lake Nubia,
until the onset of a humid phase around 8500 BC
(radiocarbon-calibrated date). The rapid arrival of wet
conditions during this Early Holocene period provided an
impetus for population movement into habitat that was
quickly settled afterwards. Hg E-M78* representatives,although rare overall, still occur in Egypt, which is a hub
for the distribution of the various geographically localized
M78-related sub-clades. The northward-moving rainfallbelts during this period could have also spurred a rapid
migration of Mesolithic foragers northwards in Africa, the
Levant and ultimately onwards to Asia Minor and Europe,
where they each eventually differentiated into their
regionally distinctive branches."
that during a desiccation period in North Africa, while the
eastern Sahara was depopulated, a refugium existed on the
border of present-day Sudan and Egypt, near Lake Nubia,
until the onset of a humid phase around 8500 BC
(radiocarbon-calibrated date). The rapid arrival of wet
conditions during this Early Holocene period provided an
impetus for population movement into habitat that was
quickly settled afterwards. Hg E-M78* representatives,although rare overall, still occur in Egypt, which is a hub
for the distribution of the various geographically localized
M78-related sub-clades. The northward-moving rainfallbelts during this period could have also spurred a rapid
migration of Mesolithic foragers northwards in Africa, the
Levant and ultimately onwards to Asia Minor and Europe,
where they each eventually differentiated into their
regionally distinctive branches."
- Vincenza Battaglia et. al. 2009, Y-chromosomal evidence of the cultural diffusion of
agriculture in southeast Europe
agriculture in southeast Europe
They reference this text:
Kuper R, Kro¨pelin S: Climate-controlled Holocene occupationin the Sahara: motor of Africa’s evolution. Science 2006; 313: 803 – 807.