Descriptive Geology.

Manapoúri System.

This system is largely developed on the west coast of Otágo, from Preservation Inlet to Milford Sound, extending inland to Lake To Anau. Elsewhere it is only known on the west side of Tasman's Bay in Nelson, from Motueka to Separation Point (Ríwaka series); but it may probably occur in Westland also.

The rocks consist of grey and red gneiss, garnet-bearing schist, hornblende-schist, mica-schist, quartz-schist, and occasionally granular limestone. Scales of graphite have been found in the mica-schist at Dusky Sound. The beds are not contorted, and the dip is almost constantly westerly, varying from 45° to 80°, the only easterly dip recorded being at the marble quarries on the north side of Caswell Sound^*; and here this dip seems to be local, for the marble on the south side of the Sound dips S.W., 45°. We can only escape from the conclusion that these rocks have a thickness of many miles by supposing either that the piano of foliation does not always coincide with the original plane of bedding, or that a series of reverse folds occur, neither of which has as yet been proved.