The mica mines of the Kodarma area in the Hazaribagh district of Bihar contribute as a single unit the largest quantity of muscovite (locally known as “Ruby mica”) to the world. The mica-pegmatites of this area have attracted the attention of geologists and mining engineers since the beginning of the last century, but still many petrological problems connected with them have not been satisfactorily solved. During recent years the present authors have studied the geology of the Government Reserve Forest of Kodarma; and they intend to discuss in this paper the origin and the characteristic features of the Kodarma pegmatites and to review the literature already existing on this subject.

Grève de lecq is situated on the north coast of Jersey, about 2½ miles from the western end of the island. On each side of the bay is a lamprophyre, discovered by Dr. A. E. Mourant, and the two dykes are so much alike in mineral composition and texture that separate description is unnecessary. The country rock is granite.

In the study of the structures acquired by sediments in the process of slumping, a knowledge of the probable state of consolidation of the materials is of some importance in forming correct views regarding submarine sliding and the conditions under which it occurred.

The discovery of an active oil seepage in Corallian sandstones at Osmington Mills, near Weymouth, led in 1937 to an examination of the adjacent Poxwell or Moigns anticline by geologists of the D'Arcy Exploration Company, a subsidiary of the Anglo-Iranian Oil Company, Ltd. The investigations, carried out by Dr. C. T. Barber in the earliest stages, and subsequently by the junior author, consisted of surface mapping assisted by pits, trenches, auger holes, and shallow bore-holes, and culminated in the drilling of a test well in the crestal area of the anticline. This note summarizes the more important information obtained with regard to stratigraphy and tectonics.

The Lower Palaeozoic rocks of Britain afford the most complete succession of graptolite faunas as yet known, but these successions are not always of uniform type, since they are controlled by different factors.

Through the kind intervention of Dr. R. Rutsch, of Basle, who himself is interested chiefly in the Tertiary mollusca of Trinidad, I have recently been able to study some tolerably well-preserved ammonites from beds in the Northern Range which have long been the subject of discussion. The ammonites had been already recognized by the Trinidad geologists as Upper Jurassic and bore the provisional identification: “Idoceras sp.,” which would have indicated a Lower Kimmeridgian age; but since confirmation of this seemed desirable, I was asked to see whether the ammonites were determinable, and if so to publish a note on the results of my investigation.