Summary: LONDON. Geological Society, May 7.—Dr. Aubrey Strahan, president, and afterwards Mr. W. Whitaker, in the chair.—M. Odling: The Bathonian rocks of the Oxford district. The lithology, palæontology, and stratigraphy of the Bathonian rocks north of Oxford are described, from the evidence afforded by numerous-quarries and well-borings and by the Ardley Cutting. The general sequence is given. After a general account of the series, the points of interest in the sections and their relations are described; and it is pointed out that, although no definite zones can be formulated, the different horizons are recognisable by their assemblage of fossils. The chemical and microscopic structures of the rocks are dealt with, and the conditions of deposition and stratigraphical relationship of the different members of the series discussed. Some structures from the Chipping-Norton Limestone are described, and the reasons given for considering them to be annelid-tubes. A list of fossils is appended. —Dr. J. A. Thomson: The petrology of the Kalgoorlie Goldfield (Western Australia). The district comprises an area about four miles long by one mile in breadth. Towards the south the auriferous lodes are rich (The Golden Mile), but in the north they are less productive. Most of the junctions are faulted. In “The Golden Mile”the central feature is a broad dyke of quartz-dolerite, forming a prominent ridge flanked by amphi-bolites and greenstones. The quartz-dolerite is cut by dykes of albite-porphyry. Gold is found in shear-zones, impregnated with sulphides and tellurides, and is most abundant in the lodes in the quartz-dolerite. The sequence of the rocks of Kalgoorlie is discussed. The greenstones, fine amphibolites, and calc-schists are regarded as the old “country-rocks,” into which the others are intrusive. The quartz-dolerites, horn-blende-dolerites, and pyroxenites are closely related one to the other. Probably the peridotite group is the early basic facies of the quartz-dolerite series, and the porphyries and porphyrites are regarded as being derived from the same magma. The characteristic of this gold field is the prevalence of albitisation in the auriferous districts. A consideration of the rock-facies developed from the magma suggests that there is in Kalgoorlie an instance of the production of auriferous lodes by rocks belonging to the same class as the pillow-lavas and their diabases and soda-granite-porphyries.