Reports of Geological Explorations Volume 13 (Paperback)

This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1881 Excerpt: ... to the deposition of either the Mount Brown heds or the underlying upper tufas, as shown by the unconformable relations of these latter to the Weka Pass stone. From this it appears that the amount of denudation in the latter case need not have been great, nor does it nppear to be so except at one or two points. Formation IV.--Lower Miocene Rocks. Pareora Formation (No. 1 of Map). In the southern end of the Trelissic Basin these rocks are found filling a syncline formed by the limestone rocks along its western side, which, beginning on the banks of Coleridge Creek, is continued north as a narrow strip passing behind Castle Hill Range to the Thomas River above the crossing of the West Coast Road. Here the beds expand in the breadth of their exposure, and in the central part of the basin between the Thomas and the Broken River reach to the foot of the high ranges bounding the basin to the north-west. In this part of the basin these younger beds necessarily abut against or rest highly unconformably upon the Lower CretaceoTertiary rocks. On the eastern side of the basin their relations, as already pointed out, are of a more conformable character. North of the Broken River the breadth of their exposure is again much contracted on account of the trend of the limestones in that direction; and north and east of Parapet Rock they are confined to the syncline between the limestone outcrops. West of the Hog's Back a small outlier of these rocks rests against the slopes of the higher ranges in that direction. This latter patch of these beds was discovered by Mr. Enys since I visited the locality. In the central part of the basin there is a considerable thickuess of strata belonging to this formation--probably not less than 400 feet. The lowest beds are loose grey...