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having but one principal or specialized surface

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8) Total 509 (100) 577 (100) Table 2: The number of core types per raw material for both assemblages Assemblage Core type Basalt Chert Hornfels Quartz Booroola 3 Bifacial 6 Bipolar 1 Unifacial 1 11 Mount Bifacial 1 1 Alexina 1 Bipolar 2 Microblade Multifacial 2 Unifacial 1 1 1 Assemblage Core type Silcrete Total Booroola 3 Bifacial 1 7 Bipolar 1 Unifacial 5 17 Mount Bifacial 1 3 Alexina 1 Bipolar 2 Microblade 2 2 Multifacial 1 3 Unifacial 3 6 Table 3: The number and (percentage) of artefact types per raw material for both assemblages Assemblage Artefact type Quartz Silcrete Booroola 3 Broken flake 278 (66.
unifacial sites in Australia and China), my expectations have changed.
While reduction stages suggest that unifacial points may be part of a transformation process in the life history of bifacial points for some regions of northern Australia (Flood 1970; Hiscock 1994), this does not appear to be the case for Kimberley points (see below).
These unifacial lanceolate tools are distributed across a large area that includes the puna of Salta and the puna of Jujuy.
However, lithic material is rare and some artefact types (rhomboidal lithic points, unifacial tranchets with a polished face and bevels) find no parallels in Fuego-Patagonia at any time range.
The remaining instruments are semi-discoidal, trapezoidal and morphologically undifferentiated scrapers, besides small bifacial and unifacial side-scrapers, core tools similar to thick scrapers, bifaces and other tools of indefinable function (Figure 8).
Only unifacial flakes made of local andesite and basalt, some with burned calcite deposits on the used edges, were found in association with hearths and burned stains in the mound and off-mound areas.
Stone artefacts are found throughout the deposits with unifacial and bifacial points [ILLUSTRATION FOR FIGURE 14 OMITTED] from some time after the mid Holocene.
Numerically as common as the tanged points are unifacial points (pointes d retouches plates), sometimes termed 'pointes de Maisieres" (Otte 1979b: 268-70), shaped by retouch, which can extend over much or even all of the dorsal face.
As flakes were removed, the outer edge gradually converged on the inner one, so that in cross-section the cutting end shifted from a standard biface to one that approximated a unifacial tool.
An index of invasiveness for the measurement of unifacial and bifacial retouch: a theoretical, experimental and archaeological verification.
Barse (1990) documented a centralised population in the middle Orinoco Basin (a forest / savanna transitional environment) that used unifacial stone tools dating to the early Holocene.
The enhanced bulb of percussion was the key element in tula design, as once the bulb was truncated by unifacial retouching, a U-shaped edge profile resulted.
Perforators, burins and unifacial points also are abundant in assemblages.
This tool was made from `red chalcedony' (silica micro-cryptocrystalline), shows a lanceolate form and was manufactured by unifacial marginal reduction.