Any of various very small stone tools varying in size from 1-5 cm - mainly thin blade or blade fragments with sharp cutting edges, usually geometric in shape and set into a wooden handle or shaft or the tip of a bone or antler as an arrow point. They were shaped by abrupt retouch into various shapes like triangles and crescents. Microliths were produced during the Later Upper Palaeolithic and Mesolithic and were either struck as blades from very small cores or were made from fractured blades using the microburin technique. They are characteristic, for example, of Azilian culture of the Mesolithic. Microliths represent both a versatile and an economic use of raw material: just as blades yield more cutting edge than flakes per unit weight of raw material, so bladelets improve yet further this advantage, by a factor of something over 100 compared to core tools.