Abstract

The character of sediments from medial moraines on Berendon Glacier, British Columbia, reflects periglacial processes rather than direct glacial erosion and transport. Sediments are passively transported as talus by the glacier, and a distinct sedimentology can be contrasted with lodgement tills. Medial morane sediment is derived from a number of sources and is transported on the glacier surface and at depth near the glacier bed — there is no evidence of either textural evolution with increasing distances of glacial transport or enhanced scour of the glacier bed in the vicinity of medial moraines.

Particle-size distribution of both medial moraine debris (supraglacial morainic till) and lodgment tills is found to be independent of source rock. A bimodal grain-size distribution widely reported from the analysis of far-traveled Pleistocene tills from the mid-latitudes, reflecting the crushing characteristics of component minerals in the source rock, is not exhibited by tills from Berendon Glacier which have well-defined lithological sources. This reflects the short distances of debris transport by the glacier and is considered to be typical of other temperal valley glaciers.

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