Striae or striations
Linear fine scratches formed by the abrasive effect of debris-rich ice sliding over bedrock. Intersecting sets of striae are formed as stones are rotated, or if the direction of flow over bedrock changes.
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Exceptionally well-preserved striated pavement of Permo-Carboniferous age (c. 290 m.y. old) near Douglas in the Great Karoo region of South Africa. Photo M. J. Hambrey. |