BackgroundThe field was formed about 10 million years ago as a consequence of subduction of the Farallon and Guadalupe plates below Baja California. Vents in the Comondú-La Purísima volcanic fields usually occur along NNW-trending faults, and many lava flows are offset, sometimes repeatedly, along grabens. There are both basaltic and andesitic lava flows. The basaltic flows are typically 5-10 m thin while andesitic flows, due to their greater viscosity are up to 60-80 m thick and form dense, glassy flows with subhorizontal fractures.
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