North West Geography
Volume 16, Number 1, 2016
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This paper presents new geomorphological and sedimentological evidence relating to the glaciation of the Upper Rossendale Valley, northwest England. We identify a previously unrecognised esker and associated glaciofluvial deposits within the valley, using high-resolution hillshaded Digital Terrain Models (DTMs) constructed using LiDAR data. A temporary exposure in a subaqueous outwash fan indicates the operation of an efflux jet from a conduit exiting an ice margin in the vicinity of the Thrutch (Stacksteads) Gorge. We propose that the gorge was formed primarily by incision due to the drainage of the ice- dammed paleolake Rawtenstall during a previous glacial phase, but later operated as a subglacial meltwater channel after a local readvance of ice during the last Glacial Termination. A similar approach in other areas is likely to improve our detailed understanding of glaciation in the North West.