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W.O. Kupsch fonds
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Ventifact near Dettifoss

Ventifact near Dettifoss. Same as in slide 4, but sharp edge of this boulder may in part be the result of its original shape which is a fragment of a hexagonal basalt column. August 5, 1960.

Ventifacts

Ventifacts. A facet on a ventifact is cut by the impact of grains of wind-driven sand. Leet and Judson, 1958, p. 285.

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