These early colonists explored New Zealand to find suitable stones for tool-making. The main stone-source areas included Mayor Island, Taupo and Kerikeri for obsidian (volcanic glass); prospectors soon found (greenstone or jade) and (argillite) resources in the South Island in the areas of present-day Reefton and Nelson. Basalt was later also found which is prospected to have a use in construction. Stone served in all aspects of Polynesian life: from chopping wood to cutting and slicing food, as anchors for (canoes) and for fishing nets, for retaining the heat in a , as drills using chert, and for stone clubs. These practices, well preserved at the Wairau Bar archeological site, were typical of East Polynesian culture at the same time.