. Manual of the geology of Ireland. N. and S. As previously mentioned, the estuary of the Barrow musthave been a valley at the beginning of the Carboniferousperiod ; while, during the Esker sea period, the valleys ofthese three rivers were straits joining the sea in the centralplain of Ireland with the sea to the south ; at that time,and much later, there was also a channel running southfrom Waterford to Tramore. At the present day theserivers are tidal for many miles ; in the Suir the tide extendsa mile and a half above Carrick, in the Nore to above thevillage of Innistioge, and in the Barrow
. Manual of the geology of Ireland. N. and S. As previously mentioned, the estuary of the Barrow musthave been a valley at the beginning of the Carboniferousperiod ; while, during the Esker sea period, the valleys ofthese three rivers were straits joining the sea in the centralplain of Ireland with the sea to the south ; at that time,and much later, there was also a channel running southfrom Waterford to Tramore. At the present day theserivers are tidal for many miles ; in the Suir the tide extendsa mile and a half above Carrick, in the Nore to above thevillage of Innistioge, and in the Barrow a mile above , thirty-seven, thirty-one, and thirty-two miles,respectively, from Hook Point. The sea at the presentday is effecting scarcely any denudation in these estuaries, 3i8 Geology of Ireland. its principal work being to carry in sand, and to spreadout on the slobs the detritus brought down by the rivers. The Slaney river valley is remarkable, as the upperportion is to the westward of the Leinster range of hills,. Aughrim River Valley, County Wicklow. and, apparently, ought to belong to the basin of the this it probably did belong before the Esker sea period,as in the neighbourhood of Tullow, County of Carlow, thereis a bank of Esker gravel which deflects the river into the- Valleys. 19 gap through the hills. The Slaney keeps altogether to theW. and SW. of its water basin, and all its large tributariesflow into it from the county to the east, some of them intoits estuary, it being tidal up to Enniscorthy, about nine-teen miles from the open sea. Wexford Harbour, on thelower portion of the estuary, is a spacious lagoon, margined
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