Abstract
Construction work and planning operations in the second half of the 20th century in northern Jutland supplied important detail to the geological background for the topographic development of the Rørdal area, eastern Aalborg. The inversion and uplift of the Sorgenfrei-Tornquist Zone in end-Cretaceous – Paleocene time initiated some 60 million years of erosion that removed the uppermost Cretaceous and Cenozoic deposits. Detailed mapping of the pre-Pleistocene chalk surface supplemented with aerial photographs, quarry sections and excavated sections document the existence of karst phenomena and demonstrate that fluviokarst processes played an important role in formation of the topography. Live and palaeokarst features are supposed to be widespread in Danish limestone areas and the possible existence in a given area may be important in relation to areal planning, including raw materials extraction and water supply and protection.
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