A review of the progress of knowledge concerning the Moine Schists shows that, whereas about twenty years ago many geologists supported Horne's contention that the Moine sediments were pre-Torridonian, there has been recently a marked swing towards Peach's view that they are the equivalents of the Torridonian. The interpretation of the structural petrology of these schists in the light of this change of opinion is then discussed.

The effects of current action on the distribution of foraminiferal tests are discussed and evaluated. The distributions of current- drifted and indigenous foraminiferal tests are compared and contrasted. A simple method of plotting abundance data facilitating differentiation between current-drifted and indigenous forms has been developed and applied to assemblages from the Pliocene Coralline Crag of Sutton, Suffolk. It has been found that these assemblages do not represent the original biocoenoses, but consist largely of exotic forms.

A description is given of the geology of the northern portion of the Ruwenzori Mountains. The rocks consist chiefly of a migmatitic series of biotite-gneiss passing to plagioclase-amphibolite uncomformably overlying these are rare occurrences of a slightly metamorphosed series of conglomerates, grits, quartzites, and tale-schists. The area is bounded by rift faults which strike N.N.E.– S.S.W. and the strike of the gneiss series is in general parallel to that direction with a steep westerly dip. Major rift faults arc described and evidence given to show that they are rejuvenations of Pre-Cambrian fault lines. Dextral tear-fault movement is implied with superimposed vertical component. Evidence indicates that faulting took place under compressional stress in Pre-Cambrian times, but that tension supervened at the later stages under light load. A steeply dipping faulting system striking W.N.W.–E.S.E. is also present, and has resulted in the southern blocks rising relative to the northern: in this system also, early compressional stress has been superseded by tension.

The chemical differences which exist between the Moine and Torridonian rocks of the Scottish Highlands are of the same nature and order of magnitude as those between extreme end members of the Norwegian Sparagmite Formation. It is concluded that in Scotland, as in Norway, a unilateral trend of sedimentary differentiation operated from north-west to south-east across the direction of the Caledonian geosyncline and led to chemical grading of the arenaceous sediments transverse to the trend of the late Pre-Cambrian depositional basin.

Nodules of “pseudodiorite”, i.e. metamorphosed calcareous concretions, occur in the Lower Birrimian (Pre-Cambrian) quartz-biotite schists which are interpreted as having been calcareous muds and silts. The probable metamorphic history of these nodules is traced.

The paper draws attention to the existence in the Tertiary of Australia of three distinctive though not consecutive foraminiferal zones. The lowest zone, found in Victoria and South Australia, is of Upper Eocene age, the upper zone is not younger than Lower Miocene (Burdigalian) and the intermediate zone of Victoriella, corresponding to strata usually referred to the “Janjukian”, probably Upper Oligocene (Chattian) to Aquitanian.

A xenolith composed essentially of green pyroxene, microperthitic potash felspar, sphene, apatite, and iron ore, has been discovered in the diorite of the Glenelg-Ratagain igneous complex. it is believed to be an impregnated skarn rock associated with igneous activity earlier than the intrusion of the diorite. Introduction of P, Ti, and Na is considered to be important in the formation of the skarn.