On the floors and terrace treads of mountain valleys it is not unusual to find exceptionally large boulders. The size of these boulders is often beyond the ability of the existing stream, even in flood conditions, to have been moved by them. This raises the question of their mode of transportation from their point of origin to their resting place. This article gives four possible explanations: ice transport during the earlier glaciation of the region; mudflow transport; water-traction by rare floods of cataclysmic proportions; and intermittent progress due to alluvium erosion.

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