The Archaic time period lasted about 7,000 years, until about 3,000 years ago. As the glaciers retreated north at the beginning of this time period, the climate of Kentucky became more like it is today. Like their Paleoindian predecessors, Archaic peoples moved around from camp to camp within "home" territories in which they hunted, gathered, and fished. Sometimes, they joined together at base camps that they revisited on an annual basis. By the end of this time period, some Archaic groups were growing gourds and starchy- and oily-seeded plants. Through time, Archaic populations increased in size. A number of innovations were developed during the Archaic Period. The atlatl (also called a spearthrower) and groundstone tools were developed during this time. Archaic peoples also made chipped stone tools, and antler and bone tools.