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Intersecting minor ridges on the plain of glacial Lake Agassiz were probably pushed up by floating lake ice and apparently are not primarily the result of permafrost, wave action and running water, or a fracture pattern in the underlying bedrock, as previously suggested. Associated intersecting minor grooves were also formed by dragging lake ice. They are essentially identical to grooves forming in Great Slave Lake in recent times.
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Clayton et al. (1965) studied this question.
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