Plateau Indian
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Plateau Indian, member of any of the Native American peoples inhabiting the high plateau region between the Rocky Mountains and the coastal mountain system.
The Plateau culture area comprises a complex physiographic region that is bounded on the north by low extensions of the Rocky Mountains, such as the Cariboo Mountains; on the east by the Rocky Mountains and the Lewis Range; on the south by the Blue Mountains and the Salmon River (excepting a narrow corridor to present-day California); and on the west by the Canadian Coast Mountains and the Cascade Range. It includes the watersheds of the Columbia and Fraser rivers.
The climate in which the Plateau peoples live is of the continental type. Temperatures range from −30 °F (−34 °C) in winter to 100 °F (38 °C) in summer. Precipitation is generally low and forms a snow cover during the winter, particularly at higher altitudes. There are three different provinces of vegetation in the region. The Middle Columbia area is a steppe of sagebrush and bunchgrass fringed by yellow pine on higher levels. The Upper Columbia consists mainly of wooded areas, although grassland is found in river valleys. The Fraser area is a semi-open coniferous forest interspersed with dry grassland and a partly maritime flora.
The southern boundary of the Plateau ecosystem gradually merges with the northern reaches of the Great Basin; the boundaries between the corresponding culture areas are equally imprecise. Anthropologists sometimes refer to the Plateau and Great Basin jointly as the Intermontane culture area (see Great Basin Indian).
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