Refined depositional history and dating of the Tongaporutuan reference section, north Taranaki, New Zealand: new volcanic ash U-Pb zircon ages, biostratigraphy and sedimentation rates - Maier, K.L.; Crundwell, Martin; Coble, Matthew A.; Kingsley-Smith, Peter; Graham, Stephan (New Zealand Journal of Geology and Geophysics, 2016)