The Gravels of the Mackenzie Intermont. By R. Speight [Read before the Royal Society of New Zealand, Canterbury Branch, June 5, 1940; received by the Editor, June 6, 1940; issued separately, December, 1940.] Table of Contents. A. Introductory. B. Gravels of the Mackenzie Intermont. (a) Historical. (b) Various Occurrences. i. The Benmore Beds. ii. The Glentanner Beds. iii. The Balmoral and Irishman's Creek Beds. iv. Coal Creek (Lake Tekapo and Waitaki River). v. Hakataramea Pass. vi. Pleistocene and Recent Gravels. C. The Origin and Probable History of the Intermont. D. References. A. Introductory. A Remarkable feature of the later Tertiary and Quaternary sequence within the province of Canterbury and a little beyond it is the wide-spread occurrence of high-level gravels, which are not connected with those forming the upper layers of the Canterbury Plains. These latter have an accordant surface, which in places on the western margin is covered with morainic deposits, indicating that the last extension of the glaciers occurred after the greater part of the plains had been formed. Certain other older gravels lie at higher levels near the base of the mountains and in some of the mountain valleys, e.g. those in the valley of the Waiau River between the Hanmer Ferry and the Hope River, between the Eyre and Waimakariri Rivers, and on the higher country between Chapman Creek and the Stour in the Mount Somers area. Their relation to the plains can be attributed either to direct uplift or to some agency acting after their deposition, and probably antecedent to the deposition of the material of the plains, which has allowed the rivers intersecting them to cut down to a lower base-level, and thus leave remnants high and dry. This upllift or other cause may be only a phase of that which accounts for the terracing of the plains after the last extension of the glaciers. In addition to these two categories there are other beds apparently related to the Kowai gravels (Speight, 1919, pp. 269–81), some of which are involved in deformational movements. The most important localities where they occur are as follows: on the foothills west of the Culverden Plain; on the downs between the Waipara and Okuku Rivers; the Mairaki Downs; in the Esk Valley and the Puketeraki Gorge of the Waimakariri; forming the capping of the Home-bush Ridge and the downs west of it in the Malvern Hills; at various