Author Retains CopyrightLienert, Barry Ronald2011-08-252022-10-302011-08-252022-10-3019711971https://ir.wgtn.ac.nz/handle/123456789/25909This thesis describes the instrumentation developed for measuring the low intensities of magnetisation found in sedimentary rocks. A spinner magnetometer has been constructed employing a coil-galvanometer amplifier detection system, and later, a fluxgate system. The instrument has been used to determine the magnetic polarities of samples taken throughout 1000 metres of Pliocene-Miocene sedimentary strata at Hinakura Road, Wairarapa. These polarities have been correlated with accepted magnetic stratigraphies to yield a date for the Miocene-Pliocene boundary in New Zealand of 4.8 M yrs.pdfen-NZhttps://www.wgtn.ac.nz/library/about-us/policies-and-strategies/copyright-for-the-researcharchivePaleomagnetismMagnetometersSedimentary rocksWairarapaTextAll rights, except those explicitly waived, are held by the Author