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DAVIES, J. R., SHEPPARD, T. H., WATERS, R. A. & WILSON, D. 2006. Geology of the Llangranog District – a brief explanation of the geological map.

Sheet Explanation of the British Geological Survey, 1:50 000 Sheet 194 Llangranog (England and Wales). ii + 38 pp. Keyworth: British Geological Survey. Price £9.00 (paperback); including map £18.00. ISBN 978 0852 72566 5.

BRITISH GEOLOGICAL SURVEY. 2006. Llangranog. England and Wales Sheet 194. Bedrock and Superficial Deposits. 1:50 000. Keyworth: British Geological Survey. Price £12 (folded and cased); including Sheet Explanation £18.00. ISBN 0 7518 3447 5 (flat); 0 7518 3448 3 (folded and cased).

DAVIES, J. R., SCHOFIELD, D. I., SHEPPARD, T. H., WATERS, R. A., WILLIAMS, M. & WILSON, D. 2006. Geology of the Lampeter District – a brief explanation of the geological map. Sheet Explanation of the British Geological Survey, 1:50 000 Sheet 195 Lampeter (England and Wales). ii + 34 pp. Keyworth: British Geological Survey. Price £9.00 (paperback); including map £18.00. ISBN 978 0852 72565 8.

BRITISH GEOLOGICAL SURVEY. 2006. Lampeter. England and Wales Sheet 195. Bedrock and Superficial Deposits. 1:50 000. Keyworth: British Geological Survey. Price £12 (folded and cased); including Sheet Explanation £18.00. ISBN 0 7518 3466 1 (flat); 0 7518 3467 X (folded and cased).

The first 20% of the full text of this article appears below.

The Lower Palaeozoic rocks of Wales have become, over the past twenty years, a classic example of sedimentary basin fill in a transtensional tectonic setting. The initial mapping work towards this basin model was done piecemeal in a series of Ph.D. theses. Proper illustration and detailing of the model awaited the comprehensive surveys of the Geological Survey. The first phase of this work mapped the east to west transect comprising the Rhayader (179) and Llanilar (178) sheets, published in 1993 and 1994. This mapping showed the way in which sediment was supplied first northwestward from the Midland . . . [Full Text of this Article]