Welsh Landscape Research Articles

Solution subsidence outliers containing probable Tertiary sediment in north‐east Wales

AbstractThe pale‐coloured clays and lignites of presumed Tertiary age from the upper parts of the Mochras borehole (Wood and Woodland 1968) are not the first such materials to be recovered from the existing Welsh landscape. Similar clays and sands, and, occasionally, pebble beds and lignites have been recorded from over twenty localities, preserved beneath Glacial deposits in solution subsidence cavities in the Carboniferous Limestone. The best known such occurrence is the isolated mass at Flimston, Pembrokeshire, which has long been thought to be of Tertiary age (Dixon 1921).The others are scattered along the Carboniferous Limestone outcrop of north Wales between Llandudno in the north‐west and Mold in the south‐east. Their proximity to each other, and records of fossil remains in some of them suggested that it might be possible to effect a regional stratigraphical correlation. Certainly, whatever their age, they form a critical stratigraphical reference in hypotheses concerning the geomorphological evolution of the Welsh landscape.The Flintshire and Denbighshire occurrences are reviewed in the light of information recorded by Maw (1865 and 1867), Strahan (1890) and others, and information forthcoming from recent excavations and augering is presented.It is concluded that, like the pocket deposits of Derbyshire (with which there are numerous analogous relationships) the north Wales pockets are probably solution subsidence outliers of a sheet of fluvio‐lacustrine Tertiary sediments, in part at least 70 m thick, the product of Palaeogene deep weathering, that formerly spread over much of the area of north Wales now occupied by the Alun, Clwyd and Conway catchments.

English, Scottish, and Welsh Landscape, 1760-1860. Verse chosen by John Betjeman and Geoffrey Taylor. Lithographs By John Piper. (Muller; 10s. 6d.)

English, Scottish, and Welsh Landscape, 1760-1860. Verse chosen by John Betjeman and Geoffrey Taylor. Lithographs By John Piper. (Muller; 10s. 6d.)

The University and the Modern World. By Arnold S. Nash. (S.C.M. Press; 12s. 6d.)

The University And The Modern World. By Arnold S. Nash.Bridge InTo The Future. Letters of Max Plowman. Edited by D. L. P.Moira: Fate, Good, And Evil In Greek Thought.Process And Polarity.The Four Gospels. By Dom John Chapman.Christ In The Gospels. By A. F. T. Rawlinson, D. D., Bishop fo Derby.The Question Of Aawnglican Orders: letters to a layman. By dom Gregory DixThe Annihilation Of Man. By Leslie paul.English, Scottish, And Welsh Landscape, 1760‐1860. Verse chosen by John Betjeman and Geoffrey Taylor. Lithographs by Hohn Piper.