Sr/iool of (;eo,lril'/l((',I. Til l' Qjlffll ' ,I [ 'lIil'NSi(J' of B rijrls/ . IJeij(ls/ 1550-1850 ) m o ra ine of' the Feegletsc hcr, \ 'a lai s. S\\-itz e riand \\-as compared with th e actual \'olume being tran spo rted c urrc nth-1)\-the g lac ie r. Th e latte r is small e r by a f~\nor of'about t\\-o. In Tro ll as kagi, no rth Icela nd , a surfa ce co\'C r or d c bri s o n top o r a l'C ry slO\\' mOl'ing g lac ie r ice ma ss g lac ie r no ir. roc k g lac itT h as b ee n dated by li e h e nome tn', Th e age of' th e o lcl es t part is eo mm cll surat e \I'irh L IA mora in es in the area. Kn ow ing th e volum e of'de bri s o r a g i\'e n age a ll o\\'s an es tim a te o f' the d e bris supp ly to th e g lacier in a g i\'e n tim e. Again, there appears to han' bee n Cl sig n ificant reduction in d e hri s to the g lac ie r sincc th e turn o f'th e 19 th ce ntury, Dehri s input in th e ear ly LIA see m s to ha \'e bee n parti c u larh-co pi o us and thi s mal-be impo rta nt in the formation of so m e g lac ier depos iti o nal form s suc h as roc k g la cie rs,8
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