縱谷
It is estimated that some 100,000 years ago in the period between Río Llico and Llanquihue glaciation a large ignimbrite called San Pablo was produced. This ignimbrite covers an estimated area of immediately west of Cordillera Nevada, stretching across the Chilean Central Valley almost reaching the Chilean Coast Range. The San Pablo ignimbrite has been associated with the formation of the Cordillera Nevada Caldera.