. The Quarterly journal of the Geological Society of London. tensity and extension, although this diminution was fitful ratherthan regular. They began with the great outbursts of the enor-mous ancient crater of Agnano, and died out in the paroxysm ofMonte Nuovo. In this manner the volcanic fires which, towards the beginningof the Pleistocene Period, glowed with such intensity over theentire Phlegraean area, are now confined to a few localities on itssouthern shore-line ; and eruptive energy has shifted its centre alittle farther southward, to Vesuvius. Volcanic action, which isalways associate
. The Quarterly journal of the Geological Society of London. tensity and extension, although this diminution was fitful ratherthan regular. They began with the great outbursts of the enor-mous ancient crater of Agnano, and died out in the paroxysm ofMonte Nuovo. In this manner the volcanic fires which, towards the beginningof the Pleistocene Period, glowed with such intensity over theentire Phlegraean area, are now confined to a few localities on itssouthern shore-line ; and eruptive energy has shifted its centre alittle farther southward, to Vesuvius. Volcanic action, which isalways associated with orogenic movements, has in this case alsofollowed upon the uplift of the Apennines : an uplift which,beginning in the north, has been subsequently prolonged andslackened off southward. Thus the subterranean fires which firstkindled the volcanoes of the Tuscan Maremma and the AgroRomano, passing on by the Islands to the Phlegraean Fields andVesuvius, have now travelled farther south, to the flaming JEolianIsles, and snowy iEtna, the pillar of VI o -^ *2 o v> •si 5 *a »3 >>» t ?** ?«. >* r^ ,<T <• <o CJ cS 3 w 13 o o > 8 3 1 8<a sy si 6 u rt S S3 03 CD o +a s d n3 Hh V GO
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Keywords: ., bookcentury1800, bookdecade1840, booksubjectgeology, bookyear1845
