A stratigraphical outline of the Hecla Hoek succession summarizing post-war work in Ny Friesland is presented for the first time. This shows a geosynclinal series of sediments reaching down at least 15,000 m. below Cambrian in a more or less continuous succession. It is compared with other Hecla Hoek successions in Svalbard.

A small body of anorthosite with related gabbroic facies from the Archaean of Southern India is described. The mass is inferred to be a funnel shaped phacolithic pluton, emplaced in the crest of a steeply plunging major anticline of metasedimentary quartzite and quartz schists. The marginal rocks of the mass are gabbroic and foliated, while the core is largely made of massive anortho-sites occasionally showing flow structures. The chemistry and petrography of the rocks of this mass suggest their having resulted from differentiation in place of a gabbroic anorthosite intrusion. This occurrence is thought to be a unique example of the Adirondack type of anorthosite, and supports Buddington's hypothesis of evolution of anorthositic rocks from a gabbroic anorthosite magma.

Structures including folds, cleavages, faults, joints, and lineations are described. Three periods of folding are distinguished to which three cleavages are related. In order of decreasing age the cleavages are flow-cleavage, fracture cleavage, latest fracture cleavage. The main fault systems trend north-north—east, approximately east—west, and north-west. Joints follow two principal directions. These are north-west—south-east, and north-east—south-west. The dominant lineation is north-east—south-west. At right angles to this is a north-west—south-east lineation which affects all visible foliation. It is confined to a faint crinkling.

The Basement Complex rocks of the Northern Red Sea Hills, Sudan, are believed to be pre-Cambrian in age. They can be divided into three major sedimentary and volcanic divisions, with four main periods of igneous intrusion. The succession proposed by the author is as follows:—

Red granite.

Injection granite.

Awat series.

(Unconformity with folding, thrusting, and cleavage.)

Basic intrusive phase.

Nafirdeib series.

(Unconformity with folding, and regional metamorphism.)

Primitive system {Acid Gneiss (intrusive). Schists and Gneiss.

Recumbent shear folds and their related structures in the Mylor Slates are briefly described. It is concluded that folding has been produced by subhorizontal shearing stresses acting in a northwesterly or south-easterly direction.

Nine species (eight new) of holothurian spicules are recorded from the Oxford Clay (cordatum zone) of Redcliff, near Weymouth on the Dorset coast. The new species are described and named and the significance of a close association of Rhabdotites and Theelia is discussed. Previous records of holothurian spicules from British strata are reviewed.

The Moine Thrust Zone in the Lochcarron and Coulin Forest areas contains numerous small scale folds which plunge eastwards. The axial planes of these folds are inclined towards the north or south so that no regional directional translation of the rocks can be postulated from these structures, whose symmetry as a whole is orthorhombic. The folds are considered to have resulted from local lateral extension and concomitant compression of laminated rocks involved in the thrusting.