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of the Teremakau Biver. Further to the north-east they have not yet been closely examined along the higher mountains of the main range. These rocks.form the central axis of the range, extending from Mount Buckley, on the south side of the Brunner Gorge, to the western sources of New Biver. In this part they have not been explored, although liable to contain auriferous quartz-reefs and other metallic minerals, as do the continuation of the same line of rocks on the opposite side of the Grey Valley, along the middle slopes of the Mount Davy Bange. This la.tter, or the Langdon's area of Maitai slates, extends from the southern slopes of Bald Hill as a gradually narrowing exposure to the watershed of the right-hand branch of Ford's Creek, where it is terminated. Within the watershed of Langdon's Creek an antimony lode and a line of quartz-reef, with several parallel leaders of quartz, have been discovered, and have been prospected more or less continuously for the past twenty years. Becently fresh developments have taken place, and rich discoveries have been made in the Victory Claim, owned by Messrs. Curtis, they having touched upon a small reef containing some very rich stone. In the Lower Blackball, slate makes its appearance near the township, and the boundary-line between this and the coal-rocks follows the right bank of the stream closely to Smoke-Ho Hill, and thence, disregarding a broken area of coal country, is projected more to the north-east. Beyond this the boundary-line of the slates goes west to the top of the range in Ford's Peak, and thence follows a sinuous yet general direction to the coast-line near the Twelve-mile. From Ford's Peak to the source of the Moonlight, the Paparoa Bange is composed of Maitai slates and sandstones, if a small granite area at Barrytown be excepted. Throughout, the rocks are generally similar in the different localities, though at places sandstones predominate, as for instance between the Twelve-mile Creek and the Fourteen-mile Bluff. In this southern part of the Paparoa Bange there are six or seven distinct lines of quartz-reefs, with accompanying leaders or veins. All of them have an east and west direction and, as a rule, dip to the north. One massive outcrop runs along the north-east side of the right-hand upper branch of Blackball Creek, and passes thence into the watershed of the Ten-mile Creek, but, though the rocks are clearly exposed, this massive reef, 30ft. to 40ft. in width, does not, in this direction, appear to "live down "to any great depth. In the contrary direction it can be traced across the different gullies a distance of from one mile and three-quarters to two miles. North-east of this, another line of reef crosses the range between the Meg and southern branch of the Moonlight, another in the line of Canoe Creek and the middle branch of the Moonlight, and yet another in the left-hand branch of the Moonlight, at the extremity of the slate area. The Minerva Beef lies in the outer eastern range, that runs from the lower gorge of the Blackball to the Moonlight Township. Another, and considerably the largest, of the isolated areas of the Maitai auriferous rocks, begins on the south side of the upper part of the Snowy Biver, and constitutes a very considerable area of outer-cropping slates along the south-east side of the Little Grey Valley to the Upper Inangahua. Towards the southern end of this area the Big Biver Mine is situated, while more to the north clusters of quartz-reefs and mines surround Merrijigs, and occur in the upper part of the valley of Devil's Creek. North of the Inangahua, between Beefton and the mouth of Lankey's Gully, the breadth of the auriferous formation is considerably lessened, and does not in this part exceed three miles, while north of Larry's Creek the slate belt flanking the granite range is inconsiderable in breadth, and on the banks of the Buller is less than half a mile. East of Beefton, and between the two branches of the Inangahua Biver, a comparatively small area of these rocks contains a great number of auriferous quartz-reefs, and lodes containing antimony and other minerals. Second only to the Beefton area is that of Boatman's Creek, while a third, that of Larry's, is in a less developed condition. North of the Buller Biver a small area of slates outcrops along the gorge of the Waimangaroa Biver, the surface rocks immediately to the south being coal-measures, but beneath the coalmeasures the Waimangaroa slates are evidently connected with the area forming the bulk of Mount William, and thence extending south-west across the Buller at the Little Ohika. More to the eastward an extensive area of these rocks lies along the north side of the Buller Valley, between the Inangahua Junction and Lyell Creek. This extends north to and beyond the Mokihinui, but in this direction the northern part of this slate area has not been much explored. The Bed Queen and other reefs further down the Mokihinui occur in rocks of a schistose character, and are, therefore, not to be considered in this connection. In the south-eastern part of the area quartz-reefs occur in Mackley's, or the Orikaka Creek, but these have as yet only been noted by explorers, and no attempt has been made to ascertain if they are auriferous, or to develop them. More to the east, in the valley of New Creek, gold-bear-ing reefs occur in these beds, and are being worked; while within the watershed of Lyell Creek there has been considerable mining on several reefs for many years. A small area of these Maitai rocks appears on the south side of the Buller, at and below the junction of the Inangahua, and here also the rocks are impregnated with quartz-veins. At the very junction, dykes of granite have been intruded into the slates, and in the same manner, but on a much larger scale, granite intrusions are seen in the lower part of Lyell Creek, and along the Buller Gorge above the Lyell to the Eight-mile Creek. Between the Glenroy and the Upper Matakitaki a small area of rocks is referred by Mr. Cox to the Maitai series, but recently these beds have not been examined. XIII. Devonian. (a.) Beefton Series. —These rocks occur between Boatman's, at Capleston, and the source of Bainy Creek, and, generally speaking, lie to the east of the auriferous belt in this part of the Inangahua Valley. The formation consists of blue slates, limestones, and cherts, and has its best and most characteristic exposures and sections in Lankey's Gully, and along the south branch of the Inangahua to Garvie's Creek. The limestones are also particularly finely displayed along the right bank of the Waitahu, or north branch of the Inangahua. No quartz-reefs have yet been discovered in these rocks, and they appear to be devoid of useful minerals, except limestone.