The Exhibition Grounds, which include the site for the Empire Stadium as well as for the British Empire Exhibition, comprise an area of roughly 216 acres. The north-eastern boundary runs parallel with the Metropolitan Railway, and the North Entrance to the Exhibition is only a few yards south of Wembley Park Railway Station bridge. At or near the station the mean level is about 110 feet above O.D.; but the surface of the ground is uneven, and rises to 210 feet above O.D. at Wembley Hill, outside the south-western extremity of the Exhibition area. The Wealdstone Brook runs irregularly along the northern boundary in an easterly direction in the neighbourhood of the Amusement Park, but for the sake convenience its regular course has been slightly diverted at this point and an old lake filled up. The main sections to be described are north of the brook.

The possibility of an unconformity at the base of the Ashgillian in North Wales seems to have suggested itself to several of those who have worked in that region. A definite verdict, however, has never been recorded, and the prevailing, if not general, view is that the Caradocian and Ashgillian are everywhere conformable.

In the summer of 1915 I had occasion to visit some of the oilfields of the Western Caucasus, with the view of locating new oil-wells. During my study of the geology of the petroliferous areas on the northern slope of the Caucasus I was able to ride to the Shugo crater, the easternmost of the mud-volcanoes of the Taman peninsula. This crater is situated on the watershed between the Shugo and Chekups Rivers, about five miles south-west of the village Varen-nikovsk. From a distance, as I rode uphill from the wide, alluvial plain of the Kuban River, the picturesque and well-wooded foothills did not disclose any semblance of a mud-volcano, but on climbing the southern slope of the hill, a most unsuspected and striking view was suddenly revealed. Here at my feet lay a nearly perfect crater, about ¾ mile in diameter (Pl. XXI, Fig. 1).

Three years ago the author commenced petrological work in the Shetland Islands, and two communications dealing with different rock-groups have been published (Phillips, 1926, 1927). The work was undertaken as a subject for a degree thesis in the University of Cambridge, and the thesis as presented deals also with other rock-groups on which no published work exists. As it seems unlikely that the author's work will be continued, it has been deemed of interest to publish the following notes, incomplete though they may be.

British Honduras may be briefly described as a 3,000 feet peneplain of upper Carboniferous slates, surrounded by thick dense Oligoceue and Miocene limestones. The slates have a strike of about 250° conforming to the general Central American trend, produced at the close of the Palaeozoic. Granodiorite and quartz-porphyry were intruded at this period. The newer formations with their extension through Yucatan into Western Cuba, curve from north to north-east parallel to the rim of the 2,500 fathom Yucatan basin.

The Faeröe Islands, 180 miles north-west of the Shetlands, are a part of that far-flung region known geologically as the Brito-Arctic or Thulean province of Tertiary volcanic rocks, here represented mainly by basalt lavas. Various investigators have visited them, and written about them from time to time, but as yet, no complete, detailed geological description of them has appeared. My acquaintance with them is limited to the islands of Stromöe and Suderöe, and my visit was of too short duration to allow much detailed field-work being done. These brief notes and analyses are presented now in the hope that they may be of use to other geologists.

IN the course of an investigation into the distribution of millerite by Dr. F. J. North and the writer, the presence of linnaeite (sulphide of cobalt Co3S4) in the clay-ironstone nodules of the Coal-measures of East Glamorgan was confirmed. That sulphide of cobalt should accompany sulphide of nickel is not surprising, but the only record of its occurrence in Wales so far as the writer is aware, takes the form of a note (without title) by A. L. des Cloizeaux in a French publication. This record was based on a specimen from the “Rhonda” (Rhondda) discovered by a Mr. Terrill, of Swansea, which does not seem to have been preserved. It is possible, too, that the mineral may occur in the Coal-measures of Belgium, as nickel and cobalt were detected in the soot from flues under which coal from Beyne (near Liége, Belgium) had been burned.

The area east of the Burnsall Knolls in the north-east Lowlands of Craven is occupied by limestones of the Northern facies type, apparently unaffected by the presence of the North Craven Fault.

The beds are overlain unconformably by the Grassington Grit, which, overstepping the flanks of the Skyreholme anticlne, thus continues to the south the unconformity noticed north of the fault. It is suggested hat the line of the Skyreholme anticlne is the axis of uplift which gave rise to pre-Millstone Grit denudation. Passing westwards the beds become Reef-like in character and eventually grade into the Reef limestones of Burnsall.

Finally, my best thanks are due to Mr. R. G. S. Hudson for much help and guidance during the progress of the above work.