Cx. Влодавeц В.И.

Cx. Влодавeц В.И.

Navajo Volcanic Field - diatreme. From "Maar-Diatreme Volcanoes..." by Lorenz

NVF -diatreme and maar crater. Diagram of a diatreme with its maar-crater illustrating its exhumed position (land surface today) http://written-in-stone-seen-through-my-lens.blogspot.com/2011/01/ship-rock.html