English: The approximate immediate impact of the Whakamaru Caldera (red shading) eruptions of about 335,000 years before present. It must be emphasised that it is very challenging to define boundaries but proven deep sea core samples and land samples with discontinuities were used in this original work that incorporates data from multiple sources. Multiple other sources are consistent with those used in the annotations but there has been much extrapolation. Light white shading shows where 10cm or more tephra detected noting that for example 25cm tephra is found against prevailing wind patterns well to north west of present New Zealand and 10cm south east of Banks Peninsular suggesting multiple significant events contributed. Similarly the light yellow shading does not consider all discontinuities but rather assumes that most discontinuities are due to subsequent erosion rather than landforms of this long ago which is likely incorrect but from biosphere impact likely not significantly so (ie effective sterilisation in yellow shaded areas of all higher life forms)