. Manual of the geology of Ireland. ch one by one toppled over and were buried in thesucceeding growth of the peat. After the disappearanceof the major portion of the oak trees, the bogs year by yeargradually increased in depth, until, apparently, suddenly,for some as yet unexplained cause, their growth ceased, andon their surface forests, principally of deals, sprang all this time, however, portions of the oak forestsremained, which seems due to the oaks being destroyedonly in those low places where the peat could easilyaccumulate ; while on hills the oak still flourished, formingoa
. Manual of the geology of Ireland. ch one by one toppled over and were buried in thesucceeding growth of the peat. After the disappearanceof the major portion of the oak trees, the bogs year by yeargradually increased in depth, until, apparently, suddenly,for some as yet unexplained cause, their growth ceased, andon their surface forests, principally of deals, sprang all this time, however, portions of the oak forestsremained, which seems due to the oaks being destroyedonly in those low places where the peat could easilyaccumulate ; while on hills the oak still flourished, formingoak groves. These hills, or islands, in the bogs, althoughnow destitute of trees, are still called derries (Angliceoak-woods), the ancient name which has survived down tothe present day, probably from the time when they wereoak groves surrounded by forests of deal. In some of thewilds of Mayo, the oak may still be found growing onthe drift islands in the bogs, it always being associated Plate VI.] [Toface J>age z6g. ,ivy-% Surface. of -Bog Deed; Conkers I1 OaJc CorJcerj
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