Movius noticed that the palaeolithic stone tools from sites east of northern India never contained handaxes. They had less formal implements known as chopping tools. These were sometimes as extensively worked as the Acheulean tools from further west, but could not be described as true handaxes. Movius then drew a line on a map of India to show where the difference occurred, dividing the tools of Africa, Europe and Western and Southern Asia from those of Eastern and South-eastern Asia.