100,000 years ago during the Valdivia Interglacial the ancestral Villarrica collapsed following an eruption .
100,000 years ago during the Valdivia Interglacial the ancestral Villarrica formed a large elliptical caldera of 6.5 and 4.2 km in diameter .
100,000 years ago during the Valdivia Interglacial the ancestral Villarrica collapsed following an eruption and formed a large elliptical caldera of 6.5 and 4.2 km in diameter .