Abstract
By the word »Indicator-boulder« is meant the stones in the Quaternary layers the characteristics of which are so peculiar and distinct that it can he determined exactly from what spot or rather limited area of the region once covered by the ice they came. Knowledge of the fact that loose stones were to be found outside Scandinavia which bore a resemblance to the permanent rocks in Scandinavia had already been obtained long before any clear conception could be form ed of the significance of this resemblance. It was only gradually as the theory on the Scandinavian inland ice advanced that a clear understanding on the matter was arrived at.

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