SOCIETY AND SETTLEMENT IN GLENDALOUGH ... - Ian Cantwell

SOCIETY AND SETTLEMENT IN GLENDALOUGH ... - Ian Cantwell SOCIETY AND SETTLEMENT IN GLENDALOUGH ... - Ian Cantwell

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have been a tributary of the Avonmore in the pre-Quaternary period''. It is fed by amultiplicity ofsmall streams and joins the sea at Wicklow (Map 1)4.GlaciationPrior to the Quaternary period it is likely that an ecologically mature landscape withtemperate flora and fauna predominated. This changed completely with the climaticcollapse of c. 2.4 million years ago which instigated cycles of glaciation of increasinglength and severity interspersed with interglacial periods of which this is the latest.Over time the nature of the landscape was altered and many species became extinct,especially in the upland areas such as Wicldow which had its own mountain ice-caps. 5When the last glacial epoch, the Midlandian, ended about 13,000 years Bp6 themountain flanks bore the scars of glacial weathering and erosion, the valleys weredenuded of soils and scouring left undulating depressions that became lake systems.Out-wash moraines indicate the deposition ofrock debris ofglacial melt-waters in thefinal meltdown. Glendalough valley has a low'alluvial fan 7 which became the site ofecclesiastical settlement. From the western valleys came major deposits of glacialdebris which are to be found in the Vartry depression and are the result ofpiedmontglaciers'', These can be found especially on the Calaryuplands? which also shows signsofintense periglacial activitylO. These have created complex soil patterns which can beseen from the land use patterns oftoday. The most obvious difference is between thenorthern and southern parts of the plateau where the Archaeological evidence andplacenames suggest that the latter was marshy scrub-land and not settled until themodem period.3Farrington A., The Glaciation ofthe Wicldow mountains, R.IA. proc., Vol. XLTI, sect B, 1934, p.1744Based on Ordnance Survey, DiscoverySeries, 1:50 000, no. 565VVlUtlow,op.cit.p.2696All BP (before present) dates are given in 14C radiocarbon years.7Warren, W. A., Wick/ow in the lee Age, Dublin, 1993, p: 428ibid. pp. 10-139ibid p. 28lOibid.p.3412

\ Map 1 Topography and Drainaget~__ _ __ _-r':1above 300;

\ Map 1 Topography and Drainaget~__ _ __ _-r':1above 300;

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