It is proposed to offer a few remarks as to the general relations of the rocks described to their associates in the Channel Islands, and in the Armorican Massif generally.

The composition of chalk has been shown to consist dominantly of three types of material, in the order of their importance, (1) amorphous, or extremely fine-grained material, (2) spheres, and (3) organic remains.

The first, the writer believes, represents chemically precipitated calcite and aragonite, the second a chemically formed oolite, and the last the normal organic constituents.

Recent studies have shown that the surface waters of the ocean in favourable localities are saturated with CaCO3 and that variations in amount of CO2 mean either solution or precipitation. It is believed that the physical conditions of the Cretaceous sea favoured precipitation. Bacteria may have been a contributing factor.

It is hoped that the above suggestion of the possible chemical origin of a part of the chalk (the larger part) will cause those who have the opportunity of study to apply it further, for until the great amount of extremely fine material is accounted for the origin of chalk is not settled. The writer regards the chemical origin with favour because it seeks to explain the origin of chalk in the light of present knowledge of the precipitation of calcium carbonate from sea water.

The paper by Dr. B. Smith, recently published in the Geological magazine, has drawn attention to the interesting relations of the Coniston Limestone Series in the Coniston District.

The following paper deals with the results obtained from investigations made during recent years in North Derbyshire with a view towards elucidating the relation of the so-called “Yoredale“ or “Pendleside ” Series to the Carboniferous Limestone.

The specimen to be described was disinterred by the writer in a small and practically disused Chalk pit on the east side of the road leading from Sulham village (Berkshire) in a S.S.E. direction towards Theale, and 530 yards distant from the former. The place of burial was in the undisturbed face of the pit at about 5 feet above the road level of 190 feet above sea-level. The exposure is recorded on the 6 inch map sheet XXXVI surveyed by J. H. Blake in 1895. The Chalk in which the pit occurs is coloured as “Upper”, but the precise zone is not indicated either on the map or in the memoir (1).

During an extended study of the glacial phenomena of the above area, which includes the drainage of the Rivers Derwent and Greta, and the drainage basin of Bassenthwaite Lake, several features of general interest were found which it is proposed to outline here.