Dotsero Volcanic Complex, Colorado, USA

Remaining maar of Dotsero volcanic complex.  Image courtesy Our Community Nov, 2019

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.

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Hokkaido 3 – The Kutcharo Caldera, Hokkaido, Japan

Lake Kussharo in winter. Note that the lake is not frozen. Image courtesy Ten via YouTube.

 

This is the second of three posts on the East Hokkaido Caldera Field.  This post is centered on the Kutcharo (Kussaro or Kuttyaro) volcanic complex.