Microburin technique
Open-knowledge reference entry
The microburin technique is a special procedure for cutting up lithic blades which yields fragments that can be used in the manufacture of utensils. The usable fragments are basically geometric microliths. This technique has been recorded through the Old World, from at least the Mesolithic. It has also been recorded from the later phases of the Upper Paleolithic, as triangular and trapeze shaped microliths have been found from the end of the French Magdalenian although they are very rare. The microburin blow technique has not been found, at present, in the New World.
The technique consists of taking a blade (a flake can also be used) and placing its upper end against a support with a sharp edge (as occurs in the use of an anvil). A notch is then made and enlarged using light blows or by pressing the edge of the piece against the angled edge of the support. The notch is enlarged until the lithic blade snaps with a gentle but positive action (flection).
If the technique is carried out effectively, the break should be oblique to the axis of the blade and near to its proximal zone, giving two different pieces: which are called respectively the proximal microburin, which is the smaller of the two pieces and which retains the heel and conchoidal flakes from the original piece; and the trihedral apex, that is the larger part of the blade. The flexion break is also slightly curved and oblique to the faces of the blade: the plane of the break is curved such that it can be seen in the upper face of the trihedral apex and its negative can be seen in the lower face of the microburin.
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