The ditch section of the Overton Down experimental earthwork provides a dated record of the degradation of two free faces with opposing aspects. The earthwork constructed in 1960 was excavated in 1968 and a record of the geomorphology of the ditch section is given. A detailed description and mechanical analysis of the ditch deposits is given as a basis for a discussion on the processes leading to asymmetrical infilling. The significance of falling turves in breaking the stratigraphy of the deposits is noted.

The excavations at this Pleistocene site were undertaken to re-establish and amplify the stratification given by Boyd Dawkins. It was found that the previous excavators had cleared out the deposits to rock floor over most of the cave so the main objective could not be directly achieved. The evidence is reviewed, particulary that for the stone implements. These fall into Late Middle Palaeolithgic (Mousterian) and Early Upper Palaeolithic (proto-Solutrean) groups. There is no Creswellian. The fauna, pollen and soil analyses indicate a time scale from the end of the Eemian inter-glacial through the Weichsel glaciation to post-glacial times.

This paper is concerned with the dangers of pollution of groundwater which may arise in aquifers composed of massive well-jointed limestones. In the opinion of the author, these dangers arise proncipally from the comparatively unusual hydrology of such aquifers. Therefore, in the discussion which follows, attention will be paid mainly to hydrological facts and arguments rather than to the effects of particular pollutants. The bias of the argument will be towards the reasons why limestone aquifers may be particularly prone to pollution, rather than to instancing examples of such pollution occurring at the present time.

The Little Neath River Cave is situated in the Valley of the Nedd Fechan, Breconshire, S. Wales. It was discovered in 1967 and has been explored and surveyed to its current length of over 8 km by members of the University of Bristol Spelaeological Society. In dry weather the whole of the Nedd Fechan sinks into the system, mostly via Bridge Cave. The water resurges in the bed of the river 2 km to the south near Pwll Du, which is itself a flood rising. Sump 6 - the present end of L.N.R.C. is at the same altitude as Pwll Du. As with other South Wales cave systems the cave has been heavily influenced by the glacial history of the region. Successive phases of erosion, deposition and re-excavation are suggested. The development of the cave down-dip and the later change of direction of flow lines are linked to surface changes. The local flood hydrology is discussed with the conclusion that flows dangerous to spelaeologists may occur on almost any winter’s day. A description and Grade 5C survey of the cave are also presented. A checklist of smaller caves in the Little Neath Valley is also given.