As a result of three recent expeditions to East Greenland a remarkable dyke swarm, following closely the general direction of the coast, has been found to run from the neighbourhood of Scoresby Sound to Angmagssalik, a distance of 500 miles. The dykes are dolerites of various kinds and for the most part they are intruded into a thick Tertiary basalt series and the underlying metamorphic compled.
Summary. The major par~ of the Kap •dvar3 Hohn complex consists of two series of conspicuously banded gabbroic rocks. The primary minerals of both lower and upper layered series show a progressive change in composition, from higher to lower temperature phases, with increasing height in the complex. Minor fluctuations in the differentiation of the two series occur but the division of the layered rocks into the lower and upper series is based on abrupt and major changes in the compositions of the pyroxenes, olivine and plagioclase. This break is correlated with the injection of a large volume of undifferentiated magma which occurred after much of the lower layered series had consolidated, and from which the rocks of the upper layered series were formed. Twelve pyroxenes, five from the lower and seven from the upper layeT'e d series have been analysed ; the relationships between their optical properties and chemical composition, and between the cell parameters and composition are considered. The crystallization trend of the pyroxenes is compared with that of the Skaergaard calcium-rich pyroxenes; it is suggested that the restricted enrichment in iron shown by the Kap Edvard Holm pyroxenes may be related to the higher water-vapour pressures which prevailed during much of the period of crystallization.
The Stratigraphy Committee of the Geological Society of London presents a revision of its 1969 ‘Recommendations’ which is designed to provide a concise working guide to stratigraphical procedures.
Le Comité de Stratigraphie de la Société Géologique de Londres presente une révision de ses ‘Recommendations’ de 1969 qui est destinée à fournir un guide concis aux methodes stratigraphiques.
Die stratigraphische Kommission der geologische Gesellschaft in London stellt eine Revision ihrer ‘Empfehlungen’ von 1969 dar, die ein gestrafftes ausreichendes Handbuch zur stratigraphischen Methoden zu geben erstellt wurde.
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