ABSTRACT
ThewarmintervalbetweentheDonaustageandtheGiinz Glaciationhasonlycometoberegardedasaninterglacialin recentyears.Glacialdeposits,suchasboulderclaysortills,are extremelydifficulttocorrelateoverlongdistances,forthey areusuallyunfossiliferousandvaryincharacterinaccordance withthetypesofrocktraversedbytheicewhichdeposited them,whereasinterglacialdepositsarerelativelyeasily identified,particularlyiftheycontainpollen-grains(asthey commonlydowhenacid). Pollen-ana!Jsis 1 9 isundoubtedlyoneofthemostvaluable
techniquesnowavailableasanaidinthestratigraphicaldating andcorrelationofpeatylayersandfine-grained,water-laid depositssuchaslakemudsorsilts.Throughoutmanymonths oftheyeartheairisladenwithpollen,blownfromtrees, shrubs,grassesandotherfloweringplants,andwhenthese nearlyindestructiblegranulessettleonareaswherepeatis formingorinrelativelystillwaterwhereclayorsiltisaccumulating,theybecomeincorporatedinthedepositsandpreserved almostindefinitelyintheabsenceoflime.
