Jurassic age. Presumably they underlie the whole of the area between the lower Clarence and the sea; but, though this district has been subjected to intense dislocations and differential earth movements, nowhere do they outcrop within its bounds. (b) Clarentian. Rocks of Clarentian age are almost absent from the area east of the Lower Clarence. A small segment on the east bank of the Clarence River, a mile or so below the Gorge (see map), may possibly be Clarentian mudstone, but the exposure is greatly disturbed and far from typical of Clarentian material; indeed, the writer would prefer to regard it as of Tertiary age but for the facts that at the northern end of the outcrop it apparently underlies the Amuri Limestone and that the same material appears again to the east on the other side of the syncline of limestone. In any case, the outcrop is so small that it bears no comparison with the splendid development at Coverham on the other side of the Seaward Kaikoura Range. At Corner Hill, where the Clarence first comes within sight of the sea, dark volcanic sandstone, similar to that at the mouth of Limestone Creek in the Middle Awatere Valley, where McKay and the writer have individually collected Inoceramus and Belemnites, outcrops beneath the Amuri Limestone for a short distance. As noted by Jobberns (1928, p. 518) this occurrence is involved in a “powerful reversed fault.” These constitute the only known occurrences of the Clarentian in the district under review. In the Middle Clarence Valley, Thomson has shown (1919, p. 12) from the magnificent sections exposed in the plexus of stream valleys near Coverham, that at the type locality the Clarentian mudstones, sandstones and conglomerates attain a total thickness of approximately 8000ft. It might, therefore, be anticipated that some of this very considerable thickness of strata would be represented six miles away in the coastal area; indeed, the modern conception, due originally to McKay (1886) and supported by Cotton and Thomson, the only other geologists to report on the area, that the Cretaceous and Tertiary beds once formed a continuous cover over the sites of the Seaward and Inland Kaikoura Mountains almost requires that this should be so. Three hypotheses may be advanced to account for the facts of distribution, while still retaining the essential features of the explanation of the orogeny of the Kaikouras given by the authors mentioned: 1. That at the time of deposition the Clarentian beds were poorly developed eastward of the site of the Seaward Kaikoura Mountains. 2. That they have been subsequently removed by erosion. 3. That they have, by virtue of their general soft and incoherent nature, been crushed out by involvement in earth-movements. In consideration of the first hypothesis, an original thinning out of the deposits by overlap to the extent of over 7500 ft. in six miles seems unlikely, especially in view of Thomson's remarks that, though it was conceivable that the surface upon which the beds were laid down was markedly uneven, yet this was not borne out by field evidence, and his further statement (1919, p. 296) that the surface