Supplementary notes for 2024 Moana Oceania NZ soil judging handbook

Abstract

These supplementary maps and tables were compiled by David J. Lowe to accompany and enhance the NZ soil judging handbook prepared for the 2024 Moana Oceania Soil Judging competition held in the Rotorua region 29 November-1 December 2024 (prior to the joint NZSSS and SSA soils conference 2-5 December 2024 in Rotorua). They include maps of volcanic centres and explosively erupted products in North Island, the general soil pattern for tephra-derived soils, the main rhyolitic tephras deposited in the Rotorua-Tarawera region over the past c. 25,400 years, and the distribution of Taupo tephra (c. 232 AD), Kaharoa tephra (c. 1314 AD) and Tarawera tephra (10 June 1886 AD). Notes on the development of the Mamaku Plateau via ignimbrite emplacement and erosion and on the nature and formation of the nanoclay, allophane, are also included.