My article on mass budget terms was written to stimulate discussion so that a proper conceptual fram ework can be evolved. I believe that Dr. Glen has d efinitely contributed to this aim, and I would welcome further discussion.

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ABSTRACT. During the summer of ' 963, a drift-veneered mass of ice suddenly em e rged a t the surface of "Mille r L a ke", a n ice-walled lake a t th e te rminus of the Martin Ri ver G lac ier, Alaska. Subsequent fathomete r traverses, together w ith the fact that the iee was not at the pressure melting point, revea led th a t it had been derived from a h o le a pproximatel y 40 m . below the surface of the la ke. There a re numerous la rge de bris-covered icebergs in the la ke a nd presum a bly at least som e are form ed in this manner. Others a re d erivecl through differentia l ab lation of p rojections of th e glacie r into the la ke. Only the small icebe rgs a re form ed through calvin g. The interpreta tion of th e mecha nism o f re lease of ice from the bottom of the la ke, a nd the observation a nd interpreta tion of a rising ice-cored isl a nd in the same lake suggest th a t the ice on the bottom is deforming plas ti call y and t ha t it is undergoing compressive flow. Much of the movem ent m ay be a long shea r pla n es actua ll y found in ice be rgs d eri ved from th e bottom of th e lake. RE SUM E. Origine des icebergs cOllverls de debris el mode d 'icoulemenl de la glace dans le" M iller L ake", Marlin RiverGlacier, Alaska. Pendant I' ete '963, un e masse de g lace veinee d e d eb ri s emergea brusqu em ent d es eau x du "Mill e r Lak e", lacglae ia ire front a l du Martin Ri ver G lacier, Alaska . D es profils bath ym e triques et le fait qu e ce tte g lace n'etait pas a la temperature de fu sion montra qu 'e1 le provena it d ' un trou a 40 m sous la surface d u lac . £1 y a de nombreux et larges icebergs co uverts de d ebris sur le lac e t p robabl em ent quelques lIns son t fo rm es d e ce tle manie re. D ' a utres derivent par abla tion d iffe rent ie ll e d e proj ec t ions du g lac ier d a ns le lac. Seltis les pet its icebergs se forment pa r ve lage. L ' interpre tat io n c1u m ccanisme c1u d eco llement d e la glaee c1u fond du lac, ainsi que I'observat ion e t I' interpretation d e la na issance d'une il e a noyau d e g lace dans le m em e lac suggerent qu e la glaee du fo ncl es t dCform ee p las tiqu e ment e t so umi se a I'ecoulement d e compress io n. La plupart du mou vement do it se fa ire le long d e p la ns d e c isa ill em ent trou ves actue ll em ent dans les icebergs provenant du fond du lac. Z u AM M ENFASSUNG. D er Ursprung sclwtlbedeckter Eisberge llnd die Art des Eisjlusses im "Miller Lake" am/vfarlin-River-Glelscher, Alaska. rm Sommer [963 tauchte p lotzli ch a n d el' Oberfl ache d es "Miller L a ke", ein cm ins Eis eingebetteten See a m End e d es M a r tin-River-Gl e tsche rs in Alaska, eine mit Schutt ulllkl eidete Eislll asse a uf. Aus da rauffolgend en Lotungen und a us der T a tsache, d ass sich das Eis nicht a uf dem Dr uckschm e lz punkt befa nd, konnte gesch lossen werden, d ass es von eine m L och ca. 40 m lintel' dem Sees pi egeJ sta mmte. D el' See enth a lt v iele grosse schuttbed eckte Eisberge, von den en zulllind est einige a uf diese W eise entsta ncl en ...

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