Magma rising from the mantle has found a path to the surface through the Jemez Lineament, and produced a cluster of about 125 cinder cones, domes, volcanic necks, and a single shield volcano, Sierra Grande. Volcanism began about 7.2 million years ago, and the most recent eruption was about 60,000 years ago, at Capulin Peak. Prolonged volcanism has added melted lower crust to the original basaltic magma to produce andesite, such as that of Sierra Grande, and dacite, erupted as domes such as Red Mountain.