Dotsero is the most recent of four quaternary volcanic centers in NW Colorado. The locations and relative ages are: Dotsero (4,150 years ago), Willow Peak (undated), McCoy (0.64 Ma) and Triangle Peak (1.98 – 1.87 Ma). Triangle Peak was the only one of these not monogenetic as it produced at least 11 lava flows before activity stopped. Willow Peak is described as a young cinder cone with a narrow lava flow extending 6 – 7 km E.
The Tatun (Datun) Volcanic Group (TVG) is a number of andesitic lava domes in the northern portion of the island of Taiwan. There are at least 20 volcanoes, the southernmost (and largest) of which are located only 15 km N of Taipei City. This puts over 5 million within 5 km of the field and nearly 8 million within 30 km.
Nevado del Ruiz (also known as La Mesa de Herveo or Volcan Ruiz) is a massive active stratovolcano located some 129 km west of Bogota, Columbia. Its summit is covered with large glaciers. It is locally known as the ‘sleeping lion’, meaning that the locals remember and respect its danger.