The geological succession of the rocks of the N’Changa District is so typical of that of the Northern Rhodesia Copper Belt as a whole, and indeed of much of the Colony of Northern Rhodesia, that it is felt that a summary of the sequence of events which together make up the geological history of the district may serve as a contribution to the geological literature of the general Northern Rhodesian field. For a fuller account of the details of the petrography and mineragraphy of the rocks and ores of the N’Changa District reference should be made to Bancroft and Pelletier (1929), and Jackson (1932).

Raised beaches and terraces generally are a common feature of the coast scenery of the Channel Islands. An attempt is made here to systematize them and to correlate them with other evidence of old base-levels and, very tentatively, with similar terraces elsewhere. The scattered descriptions in the literature have been brought together and detailed field-work, including measurements, has been carried out in Jersey. The main object of the paper is to give an ordered presentation of the facts as a contribution towards the attempts, now being actively pursued, to co-ordinate the drift deposits of north-western Europe. Any excursion beyond the bare facts is made chiefly in the interests of coherence, and many possible and even obvious theoretical conclusions have been omitted. The history of the subject shows that this does not matter as readers will be able to supply immediately all the ideas that have occurred to the writer and many others besides.

In the summer of 1931 the Oxford University Hudson Straits Expedition spent five weeks on Akpatok Island, Ungava Bay, North-Eastern Canada. It was then that the writer made notes which result in the following communication.

The Tablazos or Quaternary raised beach deposits of the West Coast of South America have attracted attention for a considerable time, as evidence of recent changes in sea-level. Early accounts of those occurring on the more southerly portion of the Continent are given by d'Orbigny in his Voyage dans l'Amérique méridionale and by Charles Darwin in his Observations on the Geology of South America. The Tablazos of Peru received considerable attention in Dr. Bosworth's work (1) and a brief sketch of the fauna was given.

In the neighbourhood of Pont-erwyd and Devil’s Bridge in North Cardiganshire, the Afon Rheidol flows through a series of gorges; and it seems probable that these have not all of them the same history.