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A wetter Sahara?

 
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Osiris II
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Joined: 13 Mar 2004
Posts: 914
Location: Long Beach, CA

PostPosted: Wed Jul 28, 2004 8:31 pm    Post subject: A wetter Sahara? Reply with quote

Thought some of you might like to see this:

Institution: California State University
Advisor: Alan Almquist
Degree: M.A.

Abstract: For decades, archeologists have been aware of evidence
suggesting that the Sahara Desert was much wetter and greener
thousands of years ago. It is now possible to characterize these
locations, in terms of both aquatic and terrestrial biota, but by also
providing some data on the human inhabitants of these ecotomes. This
thesis focused primarily on the features of human settlement in the
central Sahara, looking at lifestyles of the people and examining
factors favoring a wetlands economy. Finally, as the once-favorable
conditions began disappearing, analysis of the destiny of these
Saharan peoples is made.

The Holocene followed the last glacial age, about 12,000 BC. The
temperatures in the Sahara became appreciably warmer and the climate
demonstrated a lower evapotranspiration rate. The Intertropical
Convergence Zone (ITCZ), the line along which north and south weather
fronts converge, seems to have moved several hundred miles to the
north. Since, in general, African rainfall north of the equator
increases as one heads south, the shift of the ICTZ resulted in
Saharan and sahelian zones receiving increased rainfall.

In addition to more temperate plant and animal species moving into the
Sahara, the increased moisture resulted in lakes and rivers filling
far beyond their prior capacity. In some cases, rivers breached their
normal watershed, connecting with other systems. This allowed a
broader distribution of aquatic species. In some areas, there were
widespread wetlands. The earliest such sites, when associated with
human habitation, date from ~7000 BC (with harpoons) and 6000 BC
(wavy-line pottery). Because they used pottery, these cultures were
originally considered some kind of Aquatic Neolithic.

JEG Sutton, in a 1974 article, called them the "Aquatic Civilization
of Middle Africa". Although they did little stonework, he saw their
bone work as very sophisticated. He suspected that much of their
material culture, made of perishable materials, would not have
survived. He thought them "victims" of stone-oriented scholars. Based
on geographic distribution. he thought that the ancestors of Saharan,
Songhai and Chari-Nile-speakers were these same "Middle Africans".

After the initial Holocene (postglacial) wet phase (12,000-7000 BC),
conditions became drier for 500-1000 years. This was fol- lowed by a
lesser wet phase of 2000 years. From then until 2500 BC, there was a
gradual increase in dryness. After that time, weather conditions have
been largely unchanged until the present. How did the human economies
change with the climate?

The early harpoon-fishers availed themselves of large riverine and
lake species, such as the Nile perch (known to exceed six feet).
Whether they were fully-settled or did some amount of yearly travel
isn't known. Undoubtedly, as water-tables dropped, the people needed
to augment their aquatic diet with other foods. Initially, these would
be available plant and animal foods which could be gathered.

Christopher Ehret's work touched on Sutton's language hypothesis--that
these early fishers were NiloSaharan speakers. In the process of
generating protolanguages for these speakers, he created an initial
vocabulary for both NiloSaharan, proto-Saharan and proto-Sahelian. The
words that he developed do not include fish or fishing terms (line,
net, hook, harpoon). This early vocabulary does have herding terms and
words for 'goat', 'young goat', 'cow', 'corral' and such. No other
writers dealt with this topic.

The Central Sahara is punctuated by large stone
outcrops--massifs--that create their own microclimate. In some cases,
they represent a refuge for rare species, extinct everywhere else.
Work by Henri Lhote in the 1950's documented the varied and colorful
rockpaintings found in the massifs. Grouped into 23 styles, they are
grouped as 1. Bubalus (extinct buffalo) hunters, early Neo- lithic; 2.
'Bovidian' pastoralists (considered Neolithic); 3. Equine phase,
involving pastoralists with chariots and cavalry; 4. Phase of the
camel, 1 AD. These groupings are disputed, but the images show us a
wild-animal phase, then so-called 'Roundhead' figures. These appear to
be multi-ethnic, including a 'Negroid' population.

The pastoralist period involved humpless cattle with large curved
horns, similar to the ancient Egyptian Longhorn. Features of the
people's life resemble activities of the Peul/Fulani, a contemporary
West African pastoral group. Some of the boat images re- semble those
on Egyptian monuments, raising yet other possibilities. Pastoralism
appeared about the time that weather condi- tions became considerably
drier (7000 BC), suggesting that it was a selected response to
changing conditions.

The equine phase and its suspected timing may represent the arrival of
the "Peoples of the Sea", groups that left Crete about 1500 BC (around
the time of the Trojan War) and migrated northeast, east and
southeast. The Biblical Philistines are one such group. Cretans
arrived in NE Africa about 1200 BC, joining with the Libyans and
attacking Egypt. Similar groups may have moved in from the coast and
entered the central Sahara via the caravan trails. If so, this
movement is more a political one than a response to climate change in
the central Sahara, although its outcome would affect the local
population.

Although the rock art isn't datable, it nevertheless shows us several
different worlds of the central Sahara. The earliest involves Africa's
megafauna (lions, elephants, etc) and Negroid peoples. Another one
shows herding people with cattle. Some features of these images recall
West Africa, others, Egypt. The herders look more like Somali people,
with narrow noses, thin lips, straight hair. Probable intruders with
horses and chariots are seen and, finally, the camel makes its
appearance. Are the earlier people migrants from North Africa, from
Egypt or from elsewhere?

Dhar Tichitt in southern Mauritania has been instructive as showing
the cultural response to a drier climate. Digging revealed eight
phases, from hunting megafauna (2000 BC), to limited hunting,
gathering and herding (1500-1100). Subsequent phases included
significant milling. The involved plant went from cramcram, a spiny
famine food, to millet and sorghum. Identification of the species
showed that the people had switched from gathering wild grasses to
planting them, in about 100 years. Such speed is unheard of under
normal circumstances, and suggests that the people were somehow
"presensitized" to cultivation, perhaps via a smaller outgroup that
grew up with farming and then migrated here. Both herding and planting
were presumably responses to unfavorable climate. The site was
abandoned after horses and metal weapons arrived, possibly with the
charioteers described above.

The future of the central Saharans was not always the same as at Dhar
Tichitt. Evidence suggests that the people migrated, some southwest,
some southeast, some perhaps north, following the drying riverbeds as
they sought sites where they could sus- tain themselves. Since West
Africa had not yet been favorable to settlement, due to its dense
forests, the central Saharans may represent some of the early
ancestors of some of these peoples.
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PostPosted: Wed Jul 28, 2004 8:31 pm    Post subject: Advertisement

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Sekhmet
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Joined: 20 Feb 2004
Posts: 579
Location: Rome, Georgia USA

PostPosted: Wed Jul 28, 2004 8:54 pm    Post subject: Reply with quote

How interesting Osiris II! Thanks for posting this.
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Sekhmet
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Joined: 20 Feb 2004
Posts: 579
Location: Rome, Georgia USA

PostPosted: Fri Jul 30, 2004 1:52 am    Post subject: Reply with quote

Osiris II wrote:
To be interesting, an article does not have to provide new information. Although nothing new is posted here, it is an extremely interesting article. I'm sure, especially those interested in the Pre-Dynastic era, will be very pleased that it has been posted.


This Predynastic fiend is very glad you posted it Osiris II, there is really very little known about AE prior to the Badarian Period (4,500 BCE). While your article gives more information than i have read in some time! Thanks again.

*this topic has been cleaned up by DM_28*
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Osiris II
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Joined: 13 Mar 2004
Posts: 914
Location: Long Beach, CA

PostPosted: Fri Jul 30, 2004 4:35 pm    Post subject: Reply with quote

You're more than welcome, Sekhmet...
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