THE Bibette Head granite outcrops along the western portion of the north coast of Alderney. The outcrop, as seen at present, is about five-eighths of a mile long in an E.-W. direction and about one quarter of a mile wide. The greater part of the intrusion must, however, be under the sea. The rocks into which this granite is intruded are a rather variable series of diorites, and the contact is a sharp one, although there is a certain amount of veining by the granite. Over a large part of the outcrop the granite is much decomposed and reddened. This would appear to be due largely to the action of iron-bearing solutions, derived from the magma, coming up along fissures which are parallel to the main joint planes. These run in a direction 17° west of north. The same series of solutions were probably responsible also for the epidotization of the granite which is a marked feature in various parts. Recent blasting operations at Bibette Head have exposed a large quantity of fresh granite, and although specimens were collected from all over the outcrop the bulk of the material with which the present investigation is concerned came from there.

MONCREIFFE Hill, Perthshire, is the inclusive name for the series of low hills which form the uplands to the south and south-east of the City of Perth, and whose heather and grasscovered slopes reach in the summit of Moncreiffe Hill proper, a height of 725 feet above sea-level. The alluvium of the River Tay forms the northern boundary of the area under consideration, while on the east and south-east the hills are bounded by a continuation of the northern of the two faults which let down the Upper Old Red Sandstone outlier of the Carse of Gowrie, and by the Carse and Arctic clays of the River Earn. To the east of the City of Perth the area is bounded by the Lower Old Red Sandstone.

HAVING already published a brief description of the accessory minerals of the granite in the neighbourhood of Dublin (1928) it had been the writer’s intention to make a study of the whole of the Leinster Granite giving special attention to the accessory minerals. As circumstances prevent the completion of this plan the following account has been drawn up, describing work done upon an area which extends from Dublin Bay to the neighbourhood of Aghavannagh, a distance of about 30 miles (compared with a range of 12 miles in the original paper) or nearly half the total length of the intrusion.

THE geological formation in the district around the ancient village of Worth Matravers (Geological Survey Map, “ Swanage,” Sheet 343), situated about ¾ mile from the Dorset coast, consists of Lower and Middle Purbeck Beds (Upper Jurassic). A considerable portion of these beds has been removed by denudation, with the result that the Upper Purbeck division has not been preserved near the coast, except westward at Worbarrow Bay and Lulworth Cove, and eastward at Swanage, the exposures at these localities being due to the high northerly dip. The Portland Stone immediately underlying the Purbeck Beds forms a line of inaccessible sea-cliffs extending from Winspit, one mile south-south-east from Worth Matravers, to Durlston Head, 4¼ miles in a direct line eastward.