Ash from the Ōruanui eruption from the Taupō volcano, about 26,500 years ago, covered a huge area. By taking many measurements it was possible to work out the patterns of ash thickness (in centimetres) over the whole region.
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Source: C. J. N. Wilson, ‘The 26.5 ka Oruanui eruption, New Zealand: an introduction and overview.’ Journal of Volcanology and Geothermal Research 112 (2001)