At the end of the Neolithic Age which was about the year 4000 B.C., a vacancy occurred in man's residence in Jericho and it became uninhabited for a certain period of time. There are two different evidences to support this: the existence of an accumulated layer of disintegrated organic matter over the Hill, part of which is recognizable, and the absence of any remains from the age known as the Chalcolithic Age which followed the Neolithic Age, and in which metals were used for the first time.