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IliaHeit
CAUCASUS
shellblankinasingleoperation.Aferthe
blankwasdrilledthrough,thedrillingwas
usuallydoneagainfromtheexteriorin
ordertosmoothoutirregularedgesofthe
hole.
Teperforationsusuallyhaveasymme-
tricshapewithconcentricmacroscopic
workingtracesinthedrillingprofile
whichindicateuseofabowdrillrather
thanahanddrillasseeninsimilarresults
Fig.6.Shelldebrisandbeadblanks:1-discardedumbopart;2-largeshellfagment;3-regular-
shapedshellfagmentsoftheliparea;4-beadblankswithedgeround-retouching;5-bead
blankswithoutedgeround-retouching(PhotographicArchives,MilPlainExpedition,DAI)
28
PAM23/2:SpecialStudies
