ABSTRACT A tongue of hummocky terrain ∼1 km long and ∼400 m wide extends downslope from the source area of a rock-slope failure that formed the summit arête of Sgùrr nan Ceathreamhnan in the NW Highlands. The tongue descends from ∼810 m to ∼650 m, crosses a corrie obliquely and laps onto an opposing slope. Individual hummocks are circular to elongate, up to 6 m high and streamlined. A possible origin as recessional or ice-stagnation moraines is inconsistent with hummock morphology and the alignment of the hummock belt, and the streamlining of the hummocks is incompatible with the form of unmodified rock-avalanche runout hummocks. It is proposed that the tongue of hummocky terrain represents rock-slope failure during or after ice-sheet deglaciation, and subsequent modification of runout debris by subglacial erosion during the Loch Lomond Stade (∼12.9–11.7 ka). This interpretation implies (i) that the debris was deposited by an excess-runout rock avalanche; (ii) that the glacier that subsequently occupied the corrie was warm-based; (iii) that Lateglacial landslide runout debris was not invariably evacuated by Loch Lomond Stadial glaciers, as previously suggested; and (iv) that some features interpreted as hummocky moraines elsewhere may have a similar origin.

中文翻译：

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苏格兰高地冰川形成的滑坡残骸

摘要 一条长约 1 公里、宽约 400 米的丘陵地形从形成西北高地 Sgùrr nan Ceathreamhnan 顶峰的岩坡破裂源区向下坡延伸。舌从~810 m 下降到~650 m，倾斜地穿过Corrie 并搭接在相对的斜坡上。单个小丘呈圆形延伸至 6 m 高且呈流线型。可能的成因是后退或冰滞冰碛与小丘形态和小丘带的排列不一致，小丘的流线型与未修改的岩崩跳动小丘的形式不相容。有人提出，在洛蒙德湖 (Loch Lomond Stade) 期间或之后，丘陵地形的舌头代表了冰盖消融过程中或之后的岩石斜坡破坏，以及随后的冰下侵蚀对跳动碎片的改变（~12. 9–11.7 ka）。这种解释意味着 (i) 碎片是由过度跳动的岩石雪崩沉积的；(ii) 随后占据科里的冰川是暖基的；(iii) 正如先前所建议的那样，晚冰期滑坡滑坡碎片并非总是被 Loch Lomond Stadial 冰川疏散；(iv) 在别处解释为丘状冰碛的某些特征可能具有相似的起源。