The distribution and form of the products of migmatization in the area are described and the close relationship between migmatization and folding in time and space is demonstrated. Synoptic diagrams of the linear structural elements for various parts of the area are given. The sheaves of β-axes, small folds and lineations widen with increase in migmatization, presumably due to increasing mobility of the rocks during the migmatization process.

The directions of the natural remanent magnetization of samples collected from dykes on Lundy have been measured and related to those of Tertiary lava flows in Northern Britain. Evidence is given suggesting that the dykes are Tertiary and pre-Upper Oligocene in age, and that the geomagnetic field was reversed at the time of their intrusion.

The erratics, weathering and surface relief of the Taele gravel south of Thriplow point to its being immediately post-Gipping (Saale) in age. On the other hand, its molluscan fauna is of a type usually considered to be characteristic of cold conditions associated with the last glaciation. It is concluded that this fauna is characteristic of a certain type of local conditions and not of a definite period in the Pleistocene.

A survey of brachiopod genera along lines currently adopted by students of evolution suggests that for this phylum at least the raw data can change significantly from year to year dependent upon systematic opinion and regional influences, and that even if such data are accepted as reasonable reflections of brachiopod evolution they lead to conclusions different from those published for other phyla.

The molluscan fauna of the deposits infilling the Ebbsfleet Channel is listed; it comprises forty-one species and demonstrates the existence of an interglacial phase.

A prominent shell bed from the Middle Coal Measures of the Midgeholme Coalfield, Cumberland, is here recorded for the first time. The fauna, consisting of non-marine lamellibranchs is listed and briefly described. It establishes that the horizon of the Cannel Seam at which the shell bed occurs is within the C. pseudorobusta Sub-zone of the upper part of the C. communis Zone.

In certain Pacific island chains, characterized by feldspathoids in their volcanic rocks, the arrangement of the different types of islands conforms to a pattern which suggests that yulcanicity began at one end and moved progressively along the chain, erecting a series of volcanoes, each of which passed through a succession of stages, ending as an atoll. The origin of coral reefs is discussed in the light of these observations.

A new Yoredale goniatite locality in the shales above the Jew Limestone (Lower Carboniferous) at Temon, near Greenhead, Northumberland, has yielded a fauna including Girtyoceras cf. weetsense Moore; a lower P2 age (Bollandian) is indicated. The fauna and lithology of the goniatite-bearing shale is described and the lateral correlation of the Jew Limestone discussed. It is suggested that the base of the Jew (= Hardraw = Oxford) Limestone is the most satisfactory horizon for the P1–P2 boundary in the northern Pennines.

In the suborder Ammonitina the form of the septa and sutures is strongly influenced by whorl-shape and is often highly variable within the species and even the inidvidual. Claims that septa and sutures are specially significant because they are “internal characters” are refuted, as are also claims for overriding priority in classification for particular parts of the sutures, or for details of their early pntogenetic stages, or for the inner surfaces of the septa. Interpretation of the form of the septa and sutures as primarily conditioned by external water pressure is challenged. A recent revision of two superfamilies on the basis of septal form is held to involve unnatural groupings.

A study of Cheung Chau Island has revealed a close adjustment between the form of the island and the geological structure. The island is made up of dominant granite cut by granite-porphyry and dolerite dykes, which are affected by later faulting. A theory of progressive emergence is put forward for the denudation chronology of the area and the various forms related to the former submergence have been mapped. The relation of coastal and inland forms to structure is considered, and the evolution of the coast is outlined.