Welsh Journals

Caerphilly, South Wales 1983); and Miscellaneous Publications. Among the Miscellaneous Publications are:- The geological map. An anatomy of the landscape (1984) and History of the Geological Survey in Scotland (1977). In addition, the survey has just produced a Catalogue of printed maps (1986) and there is also available a List of open file reports (1983). Among the reports prepared since 1983 are Geological Notes and local details for: Peterson-super-Ely (1984), Welsh St. Donats (1984), Churchstoke (1985), Dolfor, Kerry Hill (1985). References Bailey, E.B. 1952. Geological Survey of Great Britain. 278pp. Murby, London. Bassett, D.A. 1967. A source-book of geological, geomorphological and soil maps for Wales and the Welsh Borders (1800-1966). x + 239pp. National Museum of Wales, Cardiff. Browne, C.A. 1871. Letters and extracts from the addresses and occasional writings of J. Beete Jukes, xx + 596pp. London. Flett,J.S. 1937. The first hundred years of the Geological Survey of Great Britain. 280pp. HMSO, London. Geikie, A. 1875. Life of Sir Roderick I. Murchison with a sketch of the rise and growth of Palaeozoic geology in Britain. 2 vols. London. Geikie, A. 1895. A memoir of Sir Andrew Crombie Ramsay, x + 397pp. London. Greenly, E. & Williams, H. 1930. Methods in geological surveying. Murby, London. Harrison, J.M. 1968. Geological sciences in the world scientific community. QJlgeol.Soc.Lond. 124, 1-7. (21st William Smith Lecture). See also: Nature and significance of geological maps. Pp. 225-232 in Albritton, C.C. (ed.) The fabric of geology. Stanford, California. Her Majesty's Stationery Office. 1985. British Geological Survey. [Government Publications] HMSO. Sectional List Revised to 1 July 1985. Herries Davies, G.L. 1983. Sheets of many colours. The mapping of Ireland's rocks 1750-1890. xix + 242pp. Royal Dublin Society, Dublin. McCartney, P.J. 1977. Henry de la Beche: observations on an observer. xiii + 77pp. Friends of the National Museum of Wales, Cardiff. Natural Environment Research Council: Institute of Geological Sciences. 1983. List of open file reports. IGS/NERC, London. Natural Environment Research Council: British Geological Survey. 1986. Catalogue of printed maps. 22pp. BGS/NERC, London. North, F.J. 1928. Geological maps, their history and development with special reference to Wales. vi + 134pp. National Museum of Wales, Cardiff. North, F.J. 1933. From Giraldus Cambrensis to the geological map. The evolution of a science. Trans. Cardiff Nat. Soc. 64 (for 1931), 20-97. North, F.J. 1934. From the geological map to the Geological Survey. Glamorgan and the pioneers of geology. Trans. CardiffNat. Soc. 65 (for 1932), 41-115. North F.J. 1936. Further chapters in the history of geology in South Wales; Sir H.T. de la Beche and the Geological Survey. Trans. Cardiff Nat. Soc. 67 (for 1934), 31-103. North, F.J. 1944. Geology's debt to Henry Thomas de la Beche. Endeavour, 3, 15-19. Ramsay, A.C. 1866. The geology of North Wales. Geological Survey Memoir III. (2nd edn 1881). Woodland, A.W. 1968. Field geology and the civil engineer. Trans. Proc. Yorks geol. Soc. 36(4), 531-578. [Presidential Address.] Short Notes Encroachment of Hippophae rhamnoides L. on a sand dune ecosystem. The investigation was carried out on the Broadhaven sand dune ecosystem which is situated near Bosherston in south-west Dyfed, Wales. The region is generally characterised by a mild marine climate. The major activities in this attractive region are tourism, agriculture and the various activities associated with Milford Haven; these potentially can have important environmental impacts. The Broadhaven dune system is interesting and generally well established, it is limited laterally by limestone outcrops. The foredunes, which are frequently damaged by visitors, are colonised by various species of which Ammophila arenaria is particularly well represented. Behind this nodum is an area dominated by Hippophae rhamnoides L. (Fig. 1.). Further inland can be recognised a region of calcareous dunes characterised by a diversity of species, including: Cladonia spp., Clematis vitalba, Digitalis purpurea, Euphorbia spp., Ligustrum vulgare, Peltigera spp., Pteridium aquilinum, and Rubus fruticosus. The dunes are situated inland of an extremely popular beach and are frequently visited by holidaymakers. The concern of the present investigator is the rate of encroachment of Hippophae rhamnoides in the mid-dune region. The conflict is not an easy one to resolve insofar as it can be argued that Hippophae rhamnoides can provide sheltered and protected nesting sites for birds; against this may be argued that the encroachment of this sea buckthorn on the dune system could, theoretically at least, result in its ultimate complete domination of the dune ecosystem by out-competing many of the currently existing species. Thus the diversity of the seral stages could be reduced and access to the dune system by holidaymakers could be made extremely difficult. The Sea Buckthorn (Hippophae rhamnoides L.) is a deciduous perennial plant belonging to the Elaeagnaceae (Fig. 2). It possesses twigs which are spine tipped. It is wind pollinated and flowers generally between April and May; the flowers are small and occur in small clusters on the older parts of the plant. The species is typically found on coastal dune systems and on river beds in Europe and temperate Asia. The aim of the current investigation is to ascertain the possible rate of encroachment of Hippophae rhamnoides across the Broadhaven sand dune system. Experimental procedure. The procedure involved carefully exposing and tracing the rooting/rhizome system of several plants on the dunes from the nodum outwards. The age of peripheral and outlying plants was ascertained by dendrochronology and the distance of encroachment, in each case, was measured. Sections of stem were taken to determine the annual growth increment. Results and Discussion The rooting depth of the Hippophae