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proto-biface
proto-biface n.
Brit. 
/ˌprəʊtə(ʊ)ˈbʌɪfeɪs/
, /ˌprəʊtə(ʊ)ˈbʌɪfeɪs/U.S. /ˌproʊdoʊˈbaɪˌfeɪs/
Archaeology an early form of biface./ˌproʊdoʊˈbaɪˌfeɪs/ΘΚΠ
the world > time > relative time > the past > history or knowledge about the past > [noun] > archaeology > artefacts
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proto-biface1967
1967 Science July 430/2 The inventory includes choppers and chopping-tools,..proto-bifaces, evolved bifaces, denticulates, and several other flake tools.
1999 Jrnl. Field Archeol. 26 92/1 Some of Leakey's artifact classes are either omitted..or redefined; the ‘choppers’ that figure so prominently in the Olduvai lexicon are treated as cores..and ‘proto-bifaces’ are termed ‘elongate discoids’.
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