. Manual of the geology of Ireland. he great plateau of Miocene dolerite,while the bassets of the different flows or beds of thedolerite form minor escarpments. It seems nearly impos-sible these great escarpments were, as supposed by some,originally formed by meteoric abrasion; as this denudantat the present time, and ever since the Esker sea period,seems to have been employed in changing the originalcliffs into slopes ; perpendicular cliffs now being rarelyfound except where the sea washes the base of theescarpment. These cliffs in Ulster seem to have been formed at twodistinct periods ; the
. Manual of the geology of Ireland. he great plateau of Miocene dolerite,while the bassets of the different flows or beds of thedolerite form minor escarpments. It seems nearly impos-sible these great escarpments were, as supposed by some,originally formed by meteoric abrasion; as this denudantat the present time, and ever since the Esker sea period,seems to have been employed in changing the originalcliffs into slopes ; perpendicular cliffs now being rarelyfound except where the sea washes the base of theescarpment. These cliffs in Ulster seem to have been formed at twodistinct periods ; the base of the slope of the older onesbeing at about the 270 feet contour line, and the baseof the newer cliffs a little above or below the no feetcontour line. That the former are much older than thelatter is proved by the former being damaged bymeteoric action, which is well exemplified at the NW,margin of the plateau in the County of Londonderry,where landslips have so obscured the strata between the Plate VIII.] [To face page Sh&iyZz iecLchata height of abocuttSOO feet>Jdhcck£Lclober> from, AghjaxLcu
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Keywords: ., bookcentury1800, bookdecade1870, bookpublishe, booksubjectgeology
