Basaltic andesite

[3] This corresponds to rock in which feldspathoid makes up less than 10% and quartz less than 20% of the total QAPF fraction, and in which at least 65% of the feldspar is plagioclase.

[7] Basaltic andesite is also common where the Earth's crust is undergoing extension.

For example, mid-Cenozoic volcanic sequences in western Mexico, southwestern New Mexico, and southeastern Arizona are capped by basaltic andesite of the Southern Cordilleran Basaltic Andesite (SCORBA) suite, which may be the most extensive Cenozoic mafic suite in North America.

[8] Mount Mazama, a large composite volcano in south-central Oregon, consists of several overlapping basaltic andesite shields.

Thick sequences of basaltic andesites were erupted in a shallow-marine environment during the Paleoproterozoic as melts formed in the anomalous Kaapval craton lithosphere.