Mapping of the structural glaciology of Kongsvegen, Svalbard, reveals cvidence for four main deformational structures. These are stratifi cation, longitudina l foli ation, thrusts a nd crevasse traces. These structures a re considered in terms of th eir contribution to debris entrainment, transport a nd subsequ ent landform development. Stratification is associated with sm a ll amounts of supraglacial debri s that has been folded with fl ow-pa rall el axes; longitudin al foliati on in pl aces incorporates basal glacial sediments along folds with fl ow-pa rallel axes; and thrusts tra nsport basal debris to the glacier surface. Crevasse traces a re not sig nificant in terms of debris entrainment. The entra inm ent of basal debris along longitudinal foli ation is not a universally recognised process. At Kongsvegen this process is attributed to the development of a tra nsposition foliation, in combination with incorporation of debris-rich basal ice or soft basal sediment in the fo ld complex. M apping of the landforms in th e proglacia l a rea shows th a t debris incorpora ted along longitudina l foli ati on is released as "foli ation-pa rall el ridges" a nd th at tra nsverse ridges mark debri s-bearing thrusts. The role of longitudinal foli ation in land form devclopment has never been documented in this manner. Although the preser vation potentia l of such ridges m ay be limited, recog nition of foli a tio n-pa rall el ridges in the Pleistocen e landform record h as important impli cations fo r the interpretati on of th e d ynamics of form er ice m asses.

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ABSTRACT. Mapping of the structural glaciology of Kongsvegen, Svalbard, reveals cvidence for four main deformational structures. These are stratifi cation, longitudina l foli ation, thrusts a nd crevasse traces. These structures a re considered in terms of th eir contribution to debris entrainment, transport a nd subsequ ent landform development. Stratification is associated with sm a ll amounts of supraglacial debri s that has been folded with fl ow-pa rall el axes; longitudin al foliati on in pl aces incorporates basal glacial sediments along folds with fl ow-pa rallel axes; and thrusts tra nsport basal debris to the glacier surface. Crevasse traces a re not sig nificant in terms of debris entrainment. The entra inm ent of basal debris along longitudinal foli ation is not a universally recognised process. At Kongsvegen this process is attributed to the development of a tra nsposition foliation, in combination with incorporation of debris-rich basal ice or soft basal sediment in the fo ld complex. M apping of the landforms in th e proglacia l a rea shows th a t debris incorpora ted along longitudina l foli ati on is released as "foli ation-pa rall el ridges" a nd th at tra nsverse ridges mark debri s-bearing thrusts. The role of longitudinal foli ation in land form devclopment has never been documented in this manner. Although the preser vation potentia l of such ridges m ay be limited, recog nition of foli a tio n-pa rall el ridges in the Pleistocen e landform record h as important impli cations fo r the interpretati on of th e d ynamics of form er ice m asses.

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