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Western Pluvial Lakes Tradition
CATEGORY: culture
DEFINITION: Culture unit found throughout western North America, characterized by the exploitation of marshes and lakes in the early postglacial period and distinctive artifacts - large, stemmed, lanceolate projectile points and large, leaf-shaped bipoints. These point types immediately followed in time and perhaps derived from the Clovis culture of c 10,000-9000 BC.
pluvial
CATEGORY: term
DEFINITION: A wet climatic episode or rainy season in a normally arid area. It is marked by changes in lake levels which produce fossil beaches, among other evidence, and by changes in flora and fauna. In lowland and subtropical regions which were never covered by Pleistocene ice sheets, alternations in climate were expressed as changes in rainfall. The changes accompanying the increased precipitation led to increased human occupation in areas that otherwise were not as attractive.

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