In southern Washington state, the Cascade Range, which sits south of the dacitic Garibaldi Volcanic Belt, spans from British Columbia in Canada to Lassen Peak in northern California in the United States. Volcanoes in the range have been produced by subduction of the Juan de Fuca tectonic plate under the North American Plate. The Washington Cascades consist of Cenozoic era volcanic and intrusive rocks, and they can be divided into two segments based on age and rock type: the Western Cascades (formed between 50 and 5 million years ago) and the High Cascades (produced within the past 5 million years). Whereas the High Cascades have largely been unaffected by geological deformation processes, the Western Cascades are more folded and faulted.