The author tries to make acceptable that the hills in Northern-Twente are not considered to be a result of contortion by the inland-ice, but are considered to be a result of tectonic movements in the Old-Pleistocene.

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Grondboor & Hamer

CC BY 3.0 NL ("Naamsvermelding")

Nederlandse Geologische Vereniging

W.F. Anderson. (1970). Gestuwd ja, maar waardoor?. Grondboor & Hamer, 24(2), 30–34.