AUTHORS
Stefano Caruso, Davide D'Errico, Daniele Maffezzoli
CATEGORY
Report
LANGUAGE
English
ABSTRACT
The authors present the first results of the analysis carried out on the prehistoric lithic industry, collected during the systematic survey campaign of September 2011, in the coastal area of Capo Mannu, central western Sardinia, and coming from old collections from the same area.
Various issues are addressed: study methodologies, quantitative analysis of data, typological description of a lithic sample, an introduction to lithic supply strategies and choices regarding raw material usage, and a short final discussion.
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Various issues are addressed: study methodologies, analysis of the quantitative data, typological description of a lithic sample, an introduction to lithic supply strategies and choices regarding raw material usage, and a short final discussion.
For the general methodological considerations regarding the collection of artefacts and the project’s database-building, see Castangia, G. in this volume. Obsidian tools, flint tools and those made of different raw materials (trachytic phonolite, basalt and shist) were counted separately inside each bag.
Analytical recording forms, containing information about morphological, tipometric, technological and typological data, were specifically created along with the rest of the database. The retouch was also analysed when present. The database used for this study includes the following entries:
* Bag ID number: indicates the content of a single collection (see Castangia in this volume)
* Territorial Unit ID number: indicates the territorial unit in which the material was collected
* GPS point: GPS position of the object on the map (specifically used for the high instrument concentrations)
* Raw material: the raw material used for the object
* Type of instrument: typological definition of the object (bifacial, axe, blade, core, etc.)
* Type of fragment: indicates whether it is a whole object or it preserves only the proximal, mesial or distal part.
* Colour: entry used in particular for flint, in order to enable future comparisons and studies on the supplying points
* Type of borders: indicates types of edges present on an object (straight, concave, convex, irregular)
* Cortex: the percentage of the object's surface covered by cortex
* Type of bulb: indicates the presence and typology of bulb present on the object (smooth, flat, flat thrown prominent, absent)
* Definition of retouch: indicates which type of retouch can be observed on the object (flat, covering, direct)
* Type of heel: indicates the presence and typology of heel on the object
* Object sections: indicates the morphology of the cross-section of the object (lenticular, trapezoidal, triangular, rectangular)
* Extension of retouch: indicates the presence and type of retouch on this object
* Length: indicates the maximum length of the object
* Width: indicates the maximum width of the object
* Thickness: indicates the maximum thickness of the object
* Type of flake blank: indicates whether it is a laminar blank or a flake blank
* Presence of patination: indicates whether any patination can be observed on the surface of the object
* Surface alteration: indicates whether the object is affected by any alteration caused by washing away or floating



A majority of the lithic samples, 93% of the total sample, came from the site of Monte Benei (UT 246, 256, 278, 288, 299, 302, 305, 308, 315, 319, 332, 333, 339, 343, 352 , 359, 369, 375, 377, 387, 391, 393, 394, 398, 430, 433, 1306, 1308 - for a total of 1492 pieces – Fig. 2).
Fig. 2 - Density map showing the number of lithic findings by raw material over the area of Monte Benei: 1 – obsidian; 2 – flint; 3 - other.








FLINT AND OBSIDIAN CORES AND TOOLS
Regarding flint, the presence of 3 pyramidal cores was observed (n.21 - pl.6 item 2, n.23 – pl.6 item 5 and n.56 – pl.6 item 4), with a length between 2.7 cm and 4.8 cm and a thickness between 3 cm and 3.5 cm. Some of these cores came from the area of Porto Alabe (n.21 – pl.6 item 2) and Monte Benei (n.23 – pl.6 item 5). Furthermore, 3 prismatic cores (n.22 pl.6 item 1, n.55 – pl.6 item 6, n.57 – pl.6 item 7) with an average thickness and length of 3.9 and 2.6 cm respectively, were also certified.
Another core, this time multidirectional (n.60 – pl.6 item 3) presented a length equal to 5.7 cm and a thickness of 5.1 cm. Other finds were: a pedunculate leaf arrowhead (n.2 – pl.1 item 7), 2 blades on truncated flakes (n.3 – pl.2 item 2 and n.4 – pl.2 item 3), a scraper with an indentation (n.52 – pl.5 item 5), a truncated cortical blade (n.7 – pl.2 item 4), a truncated blade (n.53 – pl.2 item 9) and a flake (n.54 – pl.5 item 7). The sample also included a blade from Porto Alabe (n.20 – pl.2 item 5), a mesial fragment of a blade (n.59 – pl. 2 item 6) from Monte Benei and a flake of triangular section (n.24 – pl.5 item 6).
Regarding obsidian tools, 3 leafed bifacials with a flat covering retouch, one of which was intact (n.1 – pl.1 item 1) while the other two preserved only the distal part (n.10 – pl.1 item 2 and n.11 – pl.1 item 3), were identified. Two cores, both prismatic and worn-out (n.25 – pl.6 item 8 and n.26 – pl.6 item 9), with a length between 2.3 and 2.4 cm and a thickness between 2.3 and 1.9 cm, were found. Four scrapers were also identified, n.16 (pl.5 item 1) had a sided covering retouch, while n.8 (pl.5 item 2) showed an indentation on the left edge and a covering flat bifacial retouch; n.9 (pl.5 item 3) presented a flat bulb and lenticular section, while n.27 (pl.5 item 4) had a chipped flat bulb and a rectangular section. Two pedunculate and winged arrowheads (n.12 – pl.1 item 4 and n.13 – pl.1 item 6), which had the same width (1cm) and thickness (0.2 cm) but slightly different length, were catalogued. In the sample a fragment of a mesial pedunculate and winged arrowhead (n.5 – pl.1 item 5), was also identified. Lastly 2 blades (n.6 – pl.2 item 7 and n.17 – pl.2 item 8), a bladelet (n.14 – pl.2 item 10), a truncated bladelet (n.15 – pl.2 item 11) and a flake with triangular section (n.58 – pl.5 item 8), which came from the 1981 excavation of Sa Rocca Tunda, were included in the analysed sample.
TOOLS MADE USING OTHER RAW MATERIALS
As for the so-called axes, two main tool categories were identified: roughly-knapped axes and eyed axes. Two types of the first category were represented: necked (n.33 – pl.3a item 1, n.35 – pl.3a item 2, n.41 – pl.3a item 3, n.46 – pl.3b item 1, n.50 – pl.3a item 8 and n.61 – pl.3b item 5), in which the hafting was achieved by using a narrowing in the body, and simple-based (n.45 – pl.3b item 3, n.49 – pl.3a item 4 and n.51 – pl.3b item 2), while the assignment of n.29 (pl.3a item 5), n.44 (pl.3a item 6) and n.48 (pl.3b item 4) remains uncertain. The average length was 8.9 cm, but it was possible to isolate a group (n.33 - pl.3a item, n.35 – pl.3a item 2, n.45 – pl.3b item 3, n.46 – pl.3b item 1 and n.49 – pl.3a item 4) which had lengths comprised between 10.5 cm and 14.8 cm. The average width was 6.9 cm, while the average thickness was circa 2.8 cm, without any particular clusters as was the case in the length. The category of eyed-axes was represented by only one piece, n.36 (pl.3a item 7), which was, moreover extremely fragmented and difficult to interpret.
Regarding the mace heads group , in 9 out of 12 cases they were fragmented objects (n.30 – pl.4a item 7, n.31 – pl.4a item 3, n.32 – pl.4a item 5, n.34 – pl.4a item 6, n.37 – pl.4a item 4, n.38 – pl.4b item 6, n.39 – pl.4b item 4, n.43 – pl.4b item 2, n.47 – pl.4b item 3) whilst 2 objects in preparation phase were present (n.28 – pl.4a item 2 and n.42 – pl.4b item 1). The artefact n.40 (pl.4b item 5 - stone element with two holes) was inserted within this group, even if the typological characteristics presented did not allow a certain attribution. The average length was 10.2 cm, from which only the two axes in preparation phase (n.28 – pl.4a item 2 and n.42 – pl.4b item 1) diverged with a length equal to, respectively, 13 cm and 15.4 cm. The average width was 6.6 cm with a single divergent case (n.42 – pl.4b item 1) which presented a width of 11.2 cm. The average thickness was 4.2 cm. Artefact n.41 (pl.3a item 3) was very different in form and processing techniques, and its characteristics suggested a possible attribution to the Roman period.
As for the isolated findings, the polished green stone hatchet (n.19 – pl.3b item 6) had dimensions that fell within the standards for this kind of artefact - length 3 cm, width 2.6 cm, and thickness 0.5 cm. Finally, the schist point (n.18 – pl.2 item 1) from the Su Pallosu excavation, presented the following dimensions: length 8.3 cm, width 3.5 cm and thickness 1.1 cm.
COMPARISONS AND CHRONOLOGICAL ATTRIBUTION
The necked roughly-knapped axes (n.46 – pl.3b item 1, n.50 – pl.3a item 8 and n.61 pl.3b item 5) showed features that allow the comparison with those already known from the open-air settlements in the Oristanese area and attributed to the Late Neolithic Ozieri, Eneolithic Sub-Ozieri and Monte Claro phases (Lugliè 1999:223-28; Sebis personal communication). The same comparisons are valid for the simple-based axes n.49 (pl.3a item 4) and n.51 (pl.3b item 2 - Lugliè 1999:229).
The blade on a truncated flake n.3 (pl.2 item 2) - probably hafted and used as a sickle - and the flint arrowhead n.2 (pl.1 item 7) had similarities with elements associated with the Ozieri tradition in the north of the island, particularly in Anglona, in the area of Perfugas, Contraguda (Pitzalis 1989:79) and Concas (Pitzalis 1989:81).
The green stone small axe n.19 (pl. 3b n. 6) is comparable with a Late Neolithic specimen from Serra Linta of Sedilo (Tanda e De Palmas 1997:303), and to another one found in the settlement of Cuccuru Ambudu of Serramanna, datable to the same phase (Melis 1997:331). Mace heads (pl. 4a and 4b), although similar to Bronze and Early Iron Age published specimens from nuragic villages, where they are very common, are more likely to be neolithic or datable to the Roman phase. As a matter of fact, they come from the area of Monte Benei where only a Neolithic and a Roman-phase settlements were identified so far on the base of the pottery. Unfortunately, publications on and of mace heads are quite rare in Sardinia, especially for periods different than Bronze and Early Iron Age, so we have not enough elements for useful comparisons.
SUPPLYING AND CIRCULATION OF RAW MATERIALS

The so-called mace heads, round tools with either an eye shaped hafting hole or perforated round head, of which 12 specimens have been catalogued, were made with vesicular basalt. This type of stone is fairly widespread throughout the island, but its provenance from Montiferru is highly plausible, given the close proximity to this site.
A unique specimen of polished green stone hatchet was present among the analysed assemblage. It was gathered in the Su Pallosu site area (TU 1291). In Italy lithotypes such as serpentinites, eclogites, jadeites and onfacitites (Chiari et al. 1996: 35-53) can be found. The provenance of green stone, cannot be identified with certainty, because of the wide distribution of this raw material, which extends from the Alps (Piemonte) to southern Italy, until petrographic and geochemical provenance analyses are executed (Barfield 1996:57 -65).
The flint source area used in the Capo Mannu area, and in particular in Monte Benei, was identified during the surveys on a hill area behind the hamlet of Porto Alabe, in the commune of Tresnuraghes (Fig. 4). The area was reported to the survey team as a likely area of raw material provenance by geologist Dr. Salvatore Carboni. The outcrop, considerably wide, contains various different types of flint, regarding colour, inclusions and translucency, in the form of lists or nodules. The same features were also found in the analysed archaeological material, especially regarding the great variability in colour from opaque white to translucent red-orange, transparent (a type that recalls rock crystal), yellow, brown, grey, burgundy, and many other shades.

Obsidian, the widely prevalent raw material, of which 17 tools were made – 3 leafed bifacials, 3 pedunculate winged tips, 4 side scrapers, 4 blades, a flake and 2 worn-out cores – originated in Monte Arci. It can be found in primary depositions, but especially displaced by erosive processes, both along the western and southern slopes (compositional variety respectively, SB1, SB2 and SA) and along the eastern one (SC variety; Lugliè 2004:47-60). The intense erosion has caused the dismantling of the alluvial fans that extend towards Marrubiu and Uras, causing a much wider dispersion of raw material: well floated obsidian nodules, with diameters up to 25 cm and evolved cortical areas, appear in the river sections even at a depth of 1 meter and are present in the skeleton of ancient alluvial terraces carved by the palaeo-riverbeds of Rio Mogoro and Riu Mannu (Lugliè 2004:47-60). The 'obsidian route' from Monte Arci to Capo Mannu was essentially a land route that crossed the northern portion of the Campidano plain and through which raw material came in the form of half-processed cores.
CONCLUSIONS
The typological analysis of the studied finds and the similarities noticed with materials found in other sites of the investigated area, allow the attribution of the analysed sample mainly to the Ozieri culture and partly to the Sub Ozieri one. For the general chronological attribution, both the “necked” and “simple based” axes and the obsidian bifacial (n.1) proved to be particularly important. Regarding the mace heads, most of the published comparisons are related to materials attributable to the Nuragic phase, between Middle Bronze Age and Early Iron Age. Nevertheless, their attribution to Neo-Eneolithic phases cannot be excluded.
Some of the raw materials used for tool production, such as flint and trachytic phonolite, come from areas relatively close to Capo Mannu. The phonolite is uniformly distributed in the northern part of Montiferru, whilst it is almost entirely absent in the southern part, except for an appendix on the south-western slope, 10.5 km away from Capo Mannu as the crow flies. The easy retrieval of this raw material by the prehistoric communities of Capo Mannu can be related to the almost exclusive use of this raw material for the production of roughly-knapped axes (found during the 80s and 90s excavations and surveys - Maffezzoli in prep.).
Regarding flint, the distance between the outcrop located on the hills behind the village of Porto Alabe and the area of Capo Mannu, approximately 25 km, is comparatively shorter if crossed by sea, also considering the convenient landing in the proximity of the outcrop. The overland route is made more difficult by the Planargia geomorphological characteristics. It could be hypothesized that the circulation of this Planargia flint fits into the sea routes of Monte Arci’s obsidian (Tykot 2004:118-32).
Lastly, the distance between Monti Arci and the area of Capo Mannu, approximately 18 km, would suggest the land transport of obsidian, made easier by the relatively simple morphology of the territory and by the presence of numerous sheets of water exploitable as communication routes throughout the year (Stagno di Cabras).
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