Sierra la Primavera

Sierra la Primavera, in Jalisco just west of Guadalajara, is a Late Pleistocene volcanic complex within the La Primavera Biosphere Reserve. Formed over the last 200,000 years, it includes a caldera, lava domes, and lava flows rather than a single cone. Its most dramatic event occurred about 95,000 years ago, when a major VEI-6 eruption produced the Tala Tuff, spread extensive pumice flows, and created a caldera about 11 kilometers wide. Later, a lake formed inside the caldera and successive dome eruptions reshaped it between about 95,000 and 30,000 years ago. Though no historic eruptions are known, fumaroles and hot springs show it remains potentially active.

Jalisco · Mexico