The Aquatic Civilization of Middle Africa

1974 ◽  
Vol 15 (4) ◽  
pp. 527-546 ◽  
Author(s):  
J. E. G. Sutton

Between the ninth and third millennia B.C. wetter conditions prevailed over most of Africa. Lakes and rivers were fuller and some of the internal basins were temporarily linked, especially in the ‘Middle African’ belt. This comprises the southern Sahara and Sahel, stretching from the Upper Niger to the Middle Nile, with a south-easterly extension into the Upper Nile basin and the East African rift valleys. This situation was exploited by people who developed a decidedly aquatic economy and culture. From their waterside camps and settlements archaeologists have recovered bones of fish and aquatic animals which these people ate, as well as the distinctive harpoon-heads carved from bone with which they obtained them, and also pottery, bearing peculiar decoration executed with fish-bones and water-shells, made in imitation of (fishing-) baskets. Boating and other cultural developments are deducible. The harpoons date back to 7,000 b.c. at least; the pottery dates back to more than 6,000 b.c. and was clearly an African invention. It reflects important developments in gastronomy and home life.In the Kenya rift valley the main stage of Leakey's ‘Kenya Capsian’ culture is essentially the local manifestation of this far-flung ‘aquatic civilization’.Its greatest extent was achieved during the wettest times of the seventh millennium b.c., and probably involved the expansion of Negroid peoples across this continent-wide savanna belt. Also explained perhaps is the extensive, though now fragmented, distribution of languages which Greenberg combines in his ‘Nilo-Saharan’ super-family. It is suspected that aspects of this ancient aquatic way of life may be maintained or reflected by latter-day isolated or ‘unclean’ lake or swamp communities. This subject has been largely neglected by African culture-historians.Drier conditions in the late sixth and fifth millennia b.c. signalled a decline of this aquatic civilization and, in particular, broke its geographical continuity. Nevertheless, there was a qualified revival in many parts in the fourth and third millennia. In the Kenya rift this later phase seems to equate with the first stage of the ‘stone bowl cultures’. Around Lake Victoria a devolved relic survived until the eve of Bantu expansion about two thousand years ago. Other late or modified examples are known on the Nile and in the western Sudan. Generally, however, the viability and prestige of an aquatic way of life were undermined by the second millennium b.c. In the Sahara and Sahel as well as in the northerly parts of eastern Africa this decline was paralleled by the spread of pastoralism as a new basis of subsistence and prestige. Those who introduced cattle to Kenya from Ethiopia were Cushitic-speakers maintaining, significantly, a fish-taboo.This subject should prove of considerable historiographical interest. The aquatic way of life flourished through Middle Africa at the very time when grain-agriculture and stock-raising were being pioneered in the Near East; and the slow spread of agriculture in Africa, sometimes considered an indication of ‘backwardness’, may be partly explicable by the very success of the aquatic life and of its distinct cultural tradition which was ascendant for a while across the widest part of the continent.

Antiquity ◽  
1977 ◽  
Vol 51 (201) ◽  
pp. 25-34 ◽  
Author(s):  
J. E. G. Sutton

During the early post-Pleistocene there flourished right across the middle belt of the African continent a highly distinctive way of life intimately associated with the great rivers, lakes and marshes. This belt–or arc, to be more precise, corresponding roughly with the drought zone of the early 1970s–comprises the southern Sahara and the Sahel from the Atlantic to the Nile and there bends up-river to the East African rift valleys and the equator. Traceable as early as the eighth millennium BC, the zenith of this ‘aquatic civilization’ was achieved in the seventh millennium, being a time when higher rainfall made rivers longer and more permanent and caused lakes to swell and burst their basins (Butzer et al., 1972; Zinderen Bakker, 1972). Around 7000 BC, for instance, fish populations as well as hippos and crocodiles reached the central Saharan highlands, while, to their south, Lake Chad expanded enormously till it overflowed via the Benue and Lower Niger into the Atlantic. In East Africa at the same time the small lakes in the Kenya rift valley rose to combine or to create riverain links over the normal watersheds, while to their north Lake Rudolf reached a height sufficient to help feed the White Nile system.


2021 ◽  
Author(s):  
Axelle Gardin ◽  
Emmanuelle Pucéat ◽  
Géraldine Garcia ◽  
Jean-Renaud Boisserie ◽  
Olga Otero

<p><span xml:lang="EN-GB"><span>I<span xml:lang="EN-GB"><span>sotopic fluctuation of certain stable isotopes, notably Oxygen, provide important information on paleoenvironmental change along geological times. However, interpreting isotopic change along continental series depends on our ability to understand its recording, for instance in soils or in mammal teeth. In the case of continental series yielding most of available information on hominid diversification and expansion within and beyond Africa, isotopic information even seems to show discrepancies depending on the archive. In our study, we use isotopic composition in crocodilian tooth enamel. We assume that, for these ectotherms that regulate their temperature, isotopic composition recorded in their teeth mainly depends on drinking water, itself depending on precipitation. Moreover, crocodilian fossil teeth are abundant and widely distributed within continental series, thus constituting an interesting archive. We sampled crocodilian teeth from the </span></span><span xml:lang="EN-GB"><span>Shungura</span></span><span xml:lang="EN-GB"><span> Formation (Lower Omo Valley, Ethiopia), which spans major steps of human evolution between 3.6 Ma and ~1.0 Ma, tentatively correlated with major environmental changes in eastern Africa (intensification of seasonal contrasts, increasing aridity and landscape opening). The analyses of δ</span></span><sup><span xml:lang="EN-GB"><span>18</span></span></sup><span xml:lang="EN-GB"><span>O of hundreds of crocodilian teeth have identified environmental changes. Whereas the isotopic composition of paedogenic carbonates displays a different trend over time, that of crocodilian teeth relates changes already observed in mammal teeth, notably a major shift between 2.6 Ma and 2.3 Ma toward more arid conditions. Our study indicates that crocodilian teeth are a relevant archive of environmental change in continental contexts, and calls for further study to strengthen interpretations of isotopic composition in fossil archives.</span></span><span> </span></span></span></p>


2020 ◽  
Vol 94 (6) ◽  
pp. 1165-1179
Author(s):  
Adam P. Cossette ◽  
Amanda J. Adams ◽  
Stephanie K. Drumheller ◽  
Jennifer H. Nestler ◽  
Brenda R. Benefit ◽  
...  

AbstractBrochuchus is a small crocodylid originally based on specimens from the early Miocene of Rusinga Island, Lake Victoria, Kenya. Here, we report occurrences of Brochuchus from several early and middle Miocene sites. Some are from the Lake Victoria region, and others are in the Lake Turkana Basin. Specimens from the middle Miocene Maboko locality form the basis of a new species, Brochuchus parvidens, which has comparatively smaller maxillary alveoli. Because of the smaller alveoli, the teeth appear to be more widely spaced in the new species. We also provide a revised diagnosis for Brochuchus and its type species, B. pigotti. A phylogenetic analysis supports a close relationship between Brochuchus and tube-snouted Euthecodon, but although relationships among crocodylids appear poorly resolved in the set of optimal trees, this is because Brochuchus and Euthecodon, along with early Miocene “Crocodylus” gariepensis from the early Miocene of Namibia, jointly adopt two distinct positions—either closely related to the living sharp-nosed crocodile (Mecistops) or to a group including the living dwarf crocodiles (Osteolaemus). Character support for a close relationship with Mecistops is problematic, and we suspect a closer relationship to Osteolaemus will be recovered with improved sampling, but the results here are ambiguous. In either case, Brochuchus is more closely related to living groups not currently found in East Africa. This material helps constrain the timing of crocodylian faunal turnover in the East African Rift Valley System, with endemic lineages largely being replaced by Crocodylus in the middle or late Miocene possibly in response to regional xerification and the replacement of continuous rainforest cover with open grasslands and savannas.UUID: http://zoobank.org/e6f0b219-5f3e-44e5-bdb9-60a4fae8d126


Geosphere ◽  
2020 ◽  
Vol 16 (3) ◽  
pp. 890-918 ◽  
Author(s):  
C.K. Morley

Abstract Four areas (Loriu, Lojamei, Muranachok-Muruangapoi, Kamutile Hills) of well-developed Miocene-age dikes in the northern Kenya Rift (Turkana, Kenya) have been identified from fieldwork and satellite images; in total, >3500 dikes were mapped. Three areas display NNW-SSE– to N-S–oriented dike swarms, with straight, radial, and concentric patterns in zones <15 km long, and indicate NNW-SSE to N-S regional maximum horizontal principal stress (SHmax) directions in the early to middle Miocene. Individual dikes are typically <2 m wide and tens to hundreds of meters long and have accommodated <2% extension. In places (Loriu, Lojamei, Lokhone high), dikes trend at a high angle to the rift trend, suggesting some local influence (e.g., overpressured magma chamber, cracked lid–style dike intrusions over a sill or laccolith, preexisting fabric in basement) on orientation, in addition to the influence from regional stresses. Only a minor influence by basement fabrics is seen on dike orientation. The early- to middle-Miocene dikes and extrusive activity ended a long phase (up to 25 m.y.) of amagmatic half-graben development in central Kenya and southern Turkana, which lay on the southern edge of the early (Eocene–Oligocene) plume activity. The Miocene dike sets and extension on major border faults in Turkana contrast with larger, more extensive arrays of dikes in evolved systems in the Main Ethiopian Rift that are critical for accommodating crustal extension. By the Pliocene–Holocene, magmatism and intrusion along dikes had become more important for accommodating extension, and the tectonic characteristics began to resemble those of rift basins elsewhere in the eastern branch of the East African Rift.


Author(s):  
William H. Kimbel ◽  
Yoel Rak ◽  
Donald C. Johanson ◽  
Ralph L. Holloway ◽  
Michael S. Yuan

Australopithecus afarensis is a fossil hominin species known from at least four East African Rift Valley sites ranging from northern Ethiopia in the north to northern Tanzania in the south and bridging the time period between approximately 3.6 and 3.0 million years ago (Ma). First identified in the late 1970s as the bipedal but craniodentally apelike rootstock from which later Australopithecus and Homo evolved (Johanson et al., 1978; Johanson and White, 1979), A. afarensis constituted the first substantial record of unequivocal human ancestors older than 3.0 million years (Myr). An array of more recently made discoveries have placed A. afarensis in a pivotal position in early hominin phylogeny, bracketed in time between, on the one hand, two temporally successive species, A. anamensis and Ardipithecus ramidus, that jointly extend the hominin record back to 4.4 Ma (M. Leakey et al., 1995, 1998; White et al., 1994, 1995), and, on the other hand, the earliest strong (stratigraphic) evidence for hominin lineage diversification, with the first known records of A. africanus (ca. 2.7 Ma) in southern Africa, and of A. aethiopicus (ca. 2.7 Ma) and A. garhi (2.5 Ma) in eastern Africa (Walker et al., 1986; Asfaw et al., 1999).2 The task of sorting out the relationships among all of these species hinges on the interpretation of A. afarensis itself, from its alpha taxonomy and phylogenetic role to its pattern of evolution over time. A prerequisite to achieving this goal is a more complete knowledge of the A. afarensis fossil record, narrowing gaps in our knowledge of anatomy and variation, as well as of distributions in space and time. On sample size alone, A. afarensis is the best-known hominin species in the eastern African fossil record. The vast majority of fossils in the A. afarensis hypodigm, some 360 specimens, or approximately 90% of the total, have been recovered at the Hadar site, from the 200+ meter sequence of silts, sands, and clays that comprise the Hadar Formation, which is exposed along the drainages of the Awash River in the Afar Depression of northern Ethiopia (Johanson et al., 1982a; Kimbel et al., 1994).


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