A Geerts

F Geus

F Steenhoudt

J Moeyersons

M De Dapper

P Van Peer

R Fullagar

R M Bailey

S Stokes

T Vanderbeken

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News and Views
The Early to Middle Stone Age Transition and the
Emergence of Modern Human Behaviour at site 8-B-11,
Sai Island, Sudan
P. Van Peera*, R. Fullagarb, S. Stokesc, R. M. Baileyc, J. Moeyersonsd,
F. Steenhoudta, A. Geertsa, T. Vanderbekena, M. De Dappere, F. Geusf
aCatholic University of Leuven, Belgium
bUniversity of Sydney, Australia
cOxford Luminescence Research Group, School of Geography and the Environment, University of Oxford, UK
dRoyal Museum for Central Africa, Tervuren, Belgium
eUniversity of Gent, Belgium
fSection Française de la Direction des Antiquités du Soudan – Université Charles de Gaulle-Lille 3, France
Keywords: Middle Pleistocene; Sudan; Nile Valley; Early Stone Age; Middle Stone Age; Sangoan; Modern behaviour; Pigments
Introduction
Site 8-B-11 at Sai Island in northern Sudan is a
stratified site containing late Middle and early
Upper Pleistocene occupation levels in excellent
conditions of preservation. In Middle Pleistocene
times, the banks of a small gully were repeatedly
occupied by human groups leaving Acheulean and
Sangoan material cultures in an interstratified
pattern. Optical age determinations on aeolian
intercalations within the gully sediments range
between 220 and 150 ka. This sequence is trun-
cated by Nile floodplain silts in which three occu-
pation levels with Lupemban-related Nubian
Complex assemblages (Van Peer, 1998) are strati-
fied. The long archaeological sequence at 8-B-11 is
a rare African case to document the Early to
Middle Stone Age transition by means of primary
context situations in direct stratigraphic super-
position (Clark, 2001; Tryon & McBrearty, 2002).
In contrast to the Acheulean, the early MSA
Sangoan levels show sophisticated behaviours
involving considerable technological and symbolic
investment. Quartzite cobbles were used in the
grinding of vegetal materials. Yellow and red
ochre were exploited and ground to pigments using
shaped mortars and selected chert nodules. We
conclude that 8-B-11 is a key site with regard to the
initial emergence of modern human behaviour
outside subsaharan Africa (McBrearty & Brooks,
2000).
General description
Sai (Fig. 1a) is a 50 km2 island located between
the second and third Nile cataracts, 10 km south
of the town of Abri (Northern Sudan) whose
archaeological importance was recognized in
the mid 20th century (Arkell, 1949). It has
* Corresponding author. Philip Van Peer, Laboratorium
voor Prehistorie, Redingenstraat 16bis, 3000 Leuven
(Belgium).
E-mail address: philip.vanpeer@geo.kuleuven.ac.be
(P. Van Peer).
Journal of Human Evolution 45 (2003) 187–193
0047-2484/03/$ - see front matter  2003 Elsevier Ltd. All rights reserved.
doi:10.1016/S0047-2484(03)00103-9
been the scene of investigations by a French
archaeological mission since the 1950’s (Geus,
1995). From 1993 onwards, an interdisciplinary
research project was initiated aiming at a complete
study of the island’s environmental history and
human occupation (Geus, 2000).
The geological substrate consists of steeply
dipping Precambrian schist with quartz veins, dis-
conformably overlain by subhorizontal Nubian
sandstone strata. The latter are mostly only a few
meters thick, except for the 75 m high inselberg
of Jebel Adu, in the centre of the island. North of
Jebel Adu, sediment cover is limited except at the
fringes of the island. Nile gravel terraces are
present in the central southern part. A high terrace
level at 15 m above the present floodplain is mainly
composed of large quartz cobbles, serving as raw
material from Palaeolithic through protohistoric
times. The later 10 m terrace, containing mostly
small chert gravels and occasional rolled artefacts,
forms the substrate at site 8-B-11, located at the
southern foot of Jebel Adu (Fig. 1b).
The 10 m-terrace deposits are incised by a gully,
eroding into the Nubian sandstone and filled
with a sequence of alternating gravels and sands
(Fig. 2). This gully fill is overlain by black Nilotic
silts at the deflated top of which a veneer of MSA
quartz artefacts, intermingled with river gravels
and angular sandstone blocks, occurs. Two in situ
occupation levels are stratified within the black
Fig. 1. A: Simplified geomorphological map of Sai Island showing Nile gravel terraces in the centre and a Holocene silt plain at the
fringes. 1. B: Topographic map of site 8-B-11 with 0.5 m contour intervals. Line A-B represents the location of the section presented
in Fig. 2. Hatched areas indicate excavation sectors 2000–2002.
P. Van Peer et al. / Journal of Human Evolution 45 (2003) 187–193188
silts. The lithic assemblages from both the surface
and the in situ levels are very similar. Their most
prominent typological feature is the presence of
thin bifacial foliates. Blanks were produced
according to Levallois, Nubian and discoidal
reduction strategies (Van Peer, 1992). Techno-
typologically, the black silt assemblages are similar
to those associated with the eastern Saharan OIS 5
paleolakes (Wendorf et al., 1993) and others from
the Lower Nile Valley. They all belong to the early
Upper Pleistocene Nubian Complex bearing affini-
ties with the sub-Saharan Lupemban (Barham,
2001). In a few places, the black silts show struc-
tures like slickensides, dessiccation cracks and
bows, organised in plan in polygonal-like con-
figurations. These structures indicate past local
vertisol development (Coulombe & Wilding, 1996;
Nyssen et al., 2000).
Several archaeological levels are situated in the
gully fill below the black silts, typically at the
interface between fine gravel and sandy facies.
Human occupations took place on the channel
banks, apparently at times when the river regime
changed to low-energy, perhaps seasonal, activity.
Mostly, the occupation debris occur in primary
context and post-depositional disturbance is
limited. The artefacts are in fresh condition and
there are several refits of pieces found close to each
other. Organic remains, however, are virtually
lacking and small lithic chips are rare presumably
due to slight fluvial sorting.
The lowermost level contains a typologically
late Acheulean industry with large lanceolate
handaxes in extremely fresh condition. Its spatial
distribution is mostly limited to the Jebel Adu
pediment slope well above the ancient stream
Fig. 2. Synthesis of the stratigraphic succession at 8-B-11. Numbers 1–7 represent the position of archaeological levels (large triangles
are primary context situations, small triangles indicate levels affected by a degree of post-depositional reworking): 1–3: Nubian
Complex; 4–6: Sangoan; 7: Acheulean.
P. Van Peer et al. / Journal of Human Evolution 45 (2003) 187–193 189
channel. This may indicate a rather important
river activity and a humid climate. An OSL-
assessment of the overlying aeolian sands (ES)
produced quite scattered results but indicates a
maximum age of 22319 ka.
Three occupation levels with lithic assemblages
that can be qualified as Sangoan, were found in
the gully fill sediments above the ES-sands. Their
designation as Lower, Middle, and Upper
Sangoan only refers to their relative chronological
position at this site. The Lower Sangoan occurs in
a fine gravel deposit (BLG) attesting to a new
fluvial phase. This BLG-gravel has eroded
archaeological material from the top of the ES-
sands. In some areas upslope, however, these
artefacts are still in their original stratigraphic
context. Handaxes are not present in this
assemblage. Blanks are produced from discoidal
and globular cores, but flake tools are very rare.
Heavy-duty equipment is well represented, includ-
ing hammerstones, grinding stones, and several
core-axes (Clark & Kleindienst, 2001). In this
Lower Sangoan level, we observed the presence
of a dense concentration of red and yellow
ochre lumps, some with ground surfaces. An
extraordinary object (Fig. 3) was found in trench
02/C, near the southern edge of the Middle
Pleistocene gully (Fig. 2). The overall shape of this
10 cm thick Nubian sandstone slab is the result of
human action. Steep flake negatives are present on
its sides, except for the lower right part of the
perimeter where oblique flake scars occur. Two
of these flakes were found near the slab and
refitted onto its right side. Apparently, these scars
represent posterior reworking.
Except for small areas in the centre and to the
right, the upper face of the slab is made perfectly
flat by pecking. A large depression, of which the
sides have suffered both ancient and recent frac-
ture, was cut out and seems to be surrounded by a
series of small pits. This object may have served as
a grinding stone or mortar. Several small chert
pebbles with particles of yellow/red ochre adhering
to one of their faces are present in this level. They
are similar in size and appearance, displaying a
brown/red colour with black inclusions. One of
them shows a thick wear polish. Another one has
streaks of red and yellow pigment applied on one
of its faces. As chert pebbles of this appearance are
rare in the natural gravels of the gully fill sequence,
Fig. 3. Worked Nubian sandstone slab found in Lower Sangoan level (level 6 of Fig. 2). White areas represent subrecent fractures.
P. Van Peer et al. / Journal of Human Evolution 45 (2003) 187–193190
we assume that they were deliberately selected.
This may suggest that their use as pigment
grinders was surrounded with a degree of symbolic
connotation.
The Middle Sangoan occupation level rests on
top of the TLG-gravel separated from BLG by a
thin layer of coarse sand. An intricate horizontal
network of large calcified roots is present here,
remnants of an extensive vegetation cover in the
ancient black silt floodplain. Artefacts are packed
in a thin lens of clay. Quartz core-axes of Khor
Abu Anga type are present (Guichard & Guichard,
1965). Two slabs, forming part of a more or
less circular arrangement with a radius of 2.5 m
(Fig. 4), show similar cut-out depressions as the
one found in the Lower Sangoan. Possibly they are
mortars that were re-used as structural elements.
Furthermore, a number of imported quartzite
cobbles with wear facets are present. Two of them
were studied microscopically and a soft white
coating was analysed using X-ray diffraction.
Three major components were identified: major
quartz and calcite with minor feldspar (R. Pogson,
personal communication). Areas of polish on both
artefacts were also analysed, and aqueous solu-
tions were removed in a sonic bath for transmitted
light microscopy. Phytoliths and starch granules
were recovered. Their presence in association with
very bright flat polished surfaces supports the
hypothesis that the cobbles were used to pro-
cess siliceous and starchy plant tissues, possibly
grass seeds. Identification studies are currently
underway.
In the eastern part of trench 02/A, a discrete
concentration with two lanceolate handaxes and
sandstone flakes belonging to one handaxe pro-
duction sequence, occurs among the scatter of
Middle Sangoan quartz artefacts (Fig. 4). This is
Fig. 4. The distribution of artefacts in the Middle Sangoan level in excavation sector 02/A (level 5 of Fig. 2). The topography of the
top of the underlying sediment is shown by contour lines at 2 cm intervals.
P. Van Peer et al. / Journal of Human Evolution 45 (2003) 187–193 191
the only instance where the presence of handaxes is
attested in any of the Sangoan levels. One handaxe
is out of chert and the other out of ferrocrete
sandstone, raw materials that are practically
absent in the Sangoan. Furthermore, a complete
lithic reduction sequence as found here has never
been met in the Sangoan. We infer that the
archaeological debris found at this land surface are
the result of two separate events of human activity,
one leaving a Sangoan assemblage and the other
an Acheulean. The profound differences in terms
of typology, raw material use, and site use suggest
that this palimpsest situation represents the occu-
pation of the site by two different behavioural
systems.
The final infilling of the gully is represented by a
0.5 m thick unit of sands with intercalated gravel
lenses. A sand sample from the base of this unit,
right above the Middle Sangoan produced an
optical age of 18220 ka. Another one taken at
the top, above a gravel lens (UG) in which the
Upper Sangoan occurs in secondary context, is
optically-dated to 15210 ka. The gully sequence
is finally capped by the black silt floodplain.
Conclusions
Site 8-B-11, the first in the northern Nile Valley
to present an archaeological sequence spanning the
late Middle and the early Upper Pleistocene, leads
to several conclusions. Together with Kalambo
Falls (Clark, 2001; McBrearty, 2001), it strength-
ens the case for identifying the long-debated
Sangoan as a valid taxonomic entity for the early
Middle Stone Age, with a geographical distri-
bution extending far beyond the Congo basin
(Cahen, 1976; McBrearty, 1987). Earlier sugges-
tions of a Sangoan presence in the Lower and
Middle Nile are now confirmed (Arkell, 1949;
Chmielewski, 1968). It is of particular interest to
note that in the small lithic assemblage from Abu
Hagar (Lacaille, 1951), found close to the Homo
helmei cranium from Singa (Stringer et al., 1985;
McBrearty & Brooks, 2000) and likely from the
same stratigraphic position, the same lithic types
as in the Sai Sangoan are present.
Second, the Early to Middle Stone Age transi-
tion at this site shows itself as an interstratification
between Acheulean and Sangoan assemblages.
These two material cultures were produced con-
temporaneously by groups who occupied the same
land surfaces in the period around 200 ka ago. In
East Africa, the ESA/MSA transition is now
placed before 285 ka ago (Tryon & McBrearty,
2002). Such evidence may suggest that the appear-
ance of the Middle Stone Age in northern Africa is
a consequence of population replacement.
Third, recent evidence for the high antiquity of
modern behavioural features in Africa (McBrearty
& Brooks, 2000; Barham, 2001) is amplified. At
site 8-B-11, complex processing of plant foods and
symbolic pigment treatment are attested from the
earliest Sangoan occurrences onwards. In the tran-
sition to the Middle Stone Age, modern behaviour
can be seen to emerge and the geographical distri-
bution of the Sangoan may be the reflection of its
early dispersal in large parts of Africa.
Acknowledgements
The interdisciplinary project at Sai Island is
co-sponsored by the French Ministry of Foreign
Affairs and the Research Council of the
Katholieke Universiteit Leuven, Belgium (grant
OT/01/10). We thank Francesco D’Errico for pre-
liminary comments on the object in Fig. 3. We
thank the National Corporation for Antiquities
and Museums of Sudan and its inspectors in the
field for good collaboration. The drawing shown in
Fig. 3 is by Sigrid Missotten. Optical dating was
supported by a grant from the UK NERC under
the EFCHED.
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