Palynology and age of the Tadmor Group (Late Miocene-Pliocene), and Porika Formation (Early Pleistocene), South Island, New Zealand.
Reference:
Mildenhall,D.C. et al. (1981)
Palynology and age of the Tadmor Group (Late Miocene-Pliocene), and Porika Formation (Early Pleistocene), South Island, New Zealand. New Zealand Journal of Geology and Geophysics
Vol. 24 P. 515- 528