The amount of renewed movement along north-west trends in the southern part of the South Island is so marked that the Tertiary grain can in places be regarded as showing two trends at right angles to each other. To what extent movement occurred along both trends simultaneously is unknown. Conceivably movement along the Alpine Fault and renewed movement along the north-west trend of the Hokonui syncline occurred at the same time, giving a “syntaxis”. It is possible that a dynamics of folding, planation, tilt along the old fold axes and later folding or faulting at right angles to them may be repeated many times. Cotton's suggestion of warping to absorb trans-current movement along great faults fits into the same picture. Pro- Legend for Cross Sections A to Q