The Aleutian Tradition began around 2500 BC and ended in AD 1800. Aleutian artifacts are made out of chopped stone

Rock (geology)

In geology, rock or stone is a naturally occurring solid aggregate of minerals and/or mineraloids.The Earth's outer solid layer, the lithosphere, is made of rock. In general rocks are of three types, namely, igneous, sedimentary, and metamorphic...

, unlike the more common slate

Slate

Slate is a fine-grained, foliated, homogeneous metamorphic rock derived from an original shale-type sedimentary rock composed of clay or volcanic ash through low-grade regional metamorphism. The result is a foliated rock in which the foliation may not correspond to the original sedimentary layering...

 tools. The tradition is core and flake tradition using bifacially carved projectile points. The Aleutian people lived in semi-subterranean winter houses made from driftwood, whale bone, and peat. They used kayak

Kayak

A kayak is a small, relatively narrow, human-powered boat primarily designed to be manually propelled by means of a double blade paddle.The traditional kayak has a covered deck and one or more cockpits, each seating one paddler...

s, atlatl

Atlatl

An atlatl or spear-thrower is a tool that uses leverage to achieve greater velocity in dart-throwing.It consists of a shaft with a cup or a spur at the end that supports and propels the butt of the dart. The atlatl is held in one hand, gripped near the end farthest from the cup...

s and harpoons to kill sea mammals for sustenance. Around AD 1150 Aleutian houses increased considerably in size. Food was stored in special chambers inside the house and weaponry was becoming more common around these sites. The sustenance pattern changed from relying on sea mammals to eating mostly salmon. Long distance trade also started increasing community with other local groups.