The scientific proceedings of the Eighteenth Session of the International Geological Congress included twelve series of Sectional Meetings, open meetings of the Association of African Geological Surveys, and of the International Paleontological Union, and special discussions on the Geology and Mineralogy of Clays. Summaries of these Sectional and other meetings, prepared by their officers, are published in advance in the full Report of the Session.

Description of an intraformational contorted shale in the Middle Coal Measures of the Potteries Coalfield. The contorted bed occurs immediately below the Winpenny Coal in thin argillaceous measures between thick sandstones. It shows strongly slickensided contacts, and consists of black carbonaceous shale, folded, sheared, and burnished. Deformation is ascribed to shearing stresses operating during folding. This shale is called “hussle” by the miners, whilst a similarly contorted, but non-carbonaceous, shale was termed “crozzle” by old miners of the Staffordshire-Derbyshire moors.

The Moine Schists of Western Inverness-shire and North-West Argyll show a progressive increase in metamorphism when traced from the outcrop of the Moine Thrust-plane eastwards towards the central area of regional injection and migrnatitization. It is possible to distinguish four zones of progressive metamorphism characterized by the development of distinctive mineral assemblages in the very subordinate, but widely distributed and highly distinctive calc-silicate granulites. The easterly increase in grade is attributed to the thermal effect of the great injection complexes, and it is suggested that the Torridonian, the Tarskavaig Moine Schists, and the Moine Schists proper merely represent successive stages in the regional metamorphism of one formation.

Seventy specimens of trilobites are listed and reference is made to the works in which they were figured and described. Many of them were originally hi private collections which have been deposited in the University Museum since the time of the publication. The specimens have been allotted numbers under a scheme of registration which it is intended should eventually incorporate the whole of the research and reference palaeontological collections under the care of the Professor of Geology at Oxford.

It is suggested (1) that the term “Estuarine Series”, as applied to the Middle Jurassic rocks of Yorkshire, should be abandoned and that “Deltaic Series” should be substituted; (2) that the boundary between the lower and middle divisions of this series should be revised and that the persistent Eller Beck Bed should be substituted for that boundary in place of the wedging Millepore Series of the Scarborough district and its inland equivalent, the Whitwell Oolite.