. Manual of the geology of Ireland. re are fine and coarser sands interstrati-fied, like those in the recent ridges between Ladys IslandLake (County Wexford) and the sea ; the fine depositsbeing ^Eolian, and the coarse ones sand driven up duringhigh tides. Moreover, no action but marine, at the presentday, forms ridges at all like the * This was carried away with the bank in the winter In a previous writing on this subject, I suggested that the Eskers wereproduced directly by a Head of the Tide like that in the Irish Sea. Such Drift. 229 If the marine origin of the Irish E
. Manual of the geology of Ireland. re are fine and coarser sands interstrati-fied, like those in the recent ridges between Ladys IslandLake (County Wexford) and the sea ; the fine depositsbeing ^Eolian, and the coarse ones sand driven up duringhigh tides. Moreover, no action but marine, at the presentday, forms ridges at all like the * This was carried away with the bank in the winter In a previous writing on this subject, I suggested that the Eskers wereproduced directly by a Head of the Tide like that in the Irish Sea. Such Drift. 229 If the marine origin of the Irish Eskers is allowed,the various details and complications in the eskers inthe Central plain of Ireland could be explained by thecolliding, or the meeting of the Flow tide currentsbranching from the main, with those coming through thestraits, now valleys in the surrounding hills ; as also thedifferent eskers in the country to the north of the maincurrent; such details, however, would occupy too muchspace if fully entered into.* Fi6. Lugnaquillia and adjoining mountains, Co. Wicklow. Drift deposits, which must have been formed at the heads of tides, similar to those in the vicinity of theIsle of Man, can be observed in various places ; as in , where the esker drift is represented by large a meeting of tidal currents would not produce ridges, but massive supposition, therefore, has to be abandoned; and it appears moreprobable that to the colliding and parting of the tidal currents as abovedescribed such banks must be due. * The eskers proper of Scotland seem to have had a similar origin tothose of Ireland—not, however, all the drift now classed as Karnes, as underthat name have been included ridges of marine, lacustrine, fluviatile, andmeteoric drifts 230 Geology of Ireland. accumulations of fine fossiliferous sand, marl, and clay;also in some of the valleys further north ; and in theCounty Dublin, where there are also thick beds of brick-clay in the esker
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