capped by basaltic andesite of the Southern Cordilleran Basaltic Andesite (SCORBA) suite, which may be the most extensive Cenozoic mafic suite in North America. Mount Mazama, a large composite volcano in south-central Oregon, consists of several overlapping basaltic andesite shields.

Basaltic andesite is a component of back-arc basin basalt suites. The Columbia River Basalt Group