figure 4. On the first day we motored to the end of the Ahaura Valley road, then walked to our first camp at the junction of the Trent and Tutaekuri rivers. On the second day we continued up Trent River, established camp seven miles upstream at the mouth of Graf Creek, then made a circuit from Graf Creek over the top of Mount Monotis, and returned to camp by a steep gulch (Monotis Gulch) that joints Trent River a quarter of a mile upstream from Graf Creek. During this circuit two further Monotis specimens were found near the original locality. On the third day the alpine divide to the east was examined. We left the valley floor at an alluvial cone a mile upstream from the mouth of Graf Creek, followed the small stream (Confirmation Rill) that forms the cone, and then climbed through the bush to the open tops of the main divide. Two further Monotis specimens were found in loose but almost certainly locally derived boulders about 1,000 feet above Trent River. The main divide was followed south almost to Harper Pass at the heads of Taramakau and Hurunui rivers, and photo panoramas taken at three places. These panoramas were used in constructing the detail map (fig. 4). About a mile south of Confirmation Rill a large scree extends from the divide to within a thousand feet of the river and provides an easy route down from the tops. Thick volcanics and thin limestones are well exposed in the upper part of the stream that drains this scree. On the fourth day the excellent section exposed in the gorge of Trent River was examined. From the upper part of the Trent valley we crossed the Trent Saddle and camped in the east branch of Haupiri River about two miles upstream from the junction of the two branches. On the fifth and last day we walked down the Haupiri Valley to the Haupiri Road and returned by car to Greymouth.

Two of us (H. W. W. and F. W. M.) had earlier made short trips to other parts of Sheet S52, and later two of us (G. W. G. and F. W. M.) checked the offset of rock boundaries shown by McKay (1893) along the Taramakau Valley.