Students need this paper for a second year geology assignment. I have seen the citation written down incorrectly and the GeoRef citation is useless (yes I will complain to GeoRef). What they need is ….

Sevon, W. D. 1969: Stratigraphy and sedimentology of the Tertiary
rocks of the Mandamus-Dove River area, North
Canterbury, New Zealand. New Zealand journal of geology
and geophysics 12: 283-309.

The 1969 volume is back on the shelf today Tuesday 13 May