. Bulletin. Ethnology. Figure 29.—Grinding tools from the Mabaruma Phase, a-b, Metates. c, Mano fragment. high polish from use usually occurs only on the rounded edges in small areas not exceeding by cm. in diameter. Flakes and natural rocks.—The percussion-struck flakes and frag- ments of unworked rocks from the various levels of each stratigraphic excavation and the surface collections were classified by rock material (Appendix, table 2). The most significant result of this analysis is the different popularity of certain rock materials in the Mabaruma Phase in contrast to the Alaka P
. Bulletin. Ethnology. Figure 29.—Grinding tools from the Mabaruma Phase, a-b, Metates. c, Mano fragment. high polish from use usually occurs only on the rounded edges in small areas not exceeding by cm. in diameter. Flakes and natural rocks.—The percussion-struck flakes and frag- ments of unworked rocks from the various levels of each stratigraphic excavation and the surface collections were classified by rock material (Appendix, table 2). The most significant result of this analysis is the different popularity of certain rock materials in the Mabaruma Phase in contrast to the Alaka Phase (Appendix, table 1), although the two occupy the same geographical region. Wliereas in the Alaka Phase the predominant material was andesite, this is rarely used in the Mabaruma Phase. Limonite and hematite concretions, broken in various ways and used as tools or as rubbing stones in the Alaka Phase, were also rarely used in the Mabaruma Phase. The most common rock material regardless of tool type in the Mabaruma Phase is a very fine-grained, micaceous schist. The other rocks, listed in. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Smithsonian Institution. Bureau of American Ethnology. Washington : G. P. O.
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