“…While Tallavaara et al 2010 suggest that in order to reduce fragmentation bipolar knapping would be more common with quartz than with chert, a review e plus the archaeological assemblages analysed during this project e has shown bipolar knapping is not always dominant in quartz technologies (e.g. Barber, 1981;Boudreau, 1981;Bisson, 1990;Moore, 2002;Cornelissen, 2003;Driscoll, In press), notwithstanding the problems in identifying quartz bipolar artefacts. In this experiment, while the distinction between bipolar and direct percussion was generally clear, a sizable proportion of bipolar flakes appeared as direct percussion flakes; conversely, but to a lesser degree, direct percussion flakes appeared as bipolar flakes.…”