Global Volcanism Program | Image GVP-00386
Volcanologists Colin Wilson and Peter Ballance examine a roadcut that dissects deposits of major eruptions from the Taupo volcanic center. The bottom visible unit is an exposure of an unwelded pyroclastic flow deposit from the Oruanui eruption, which formed Taupo's initial caldera about 22,600 years ago. Light-colored pumice fall deposits from other major eruptions are between it and the deposits of the 1,800-year-old Taupo eruption (upper right), which were responsible for Taupo's second caldera.
Photo by Bruce Houghton (Wairakei Research Center).