Abstract
The glacial geology of Himmerland in the north-eastern part of Jylland, south of Limfjorden (Fig. 1) has never received any special attention. However, the occurrence of parallel ridges south of Torup was mentioned by Milthers (1948) who interpreted them as marginal moraines. The ridges were recently studied during mapping of eastern Himmerland. Systematic geological mapping of the area north and south of Mariager Fjord started in 2009 and was completed in 2013 (map sheet 1316 III; Pedersen et al. 2013). This was followed by the map sheet to the north (1316 IV). During the recent mapping the extent of the terrain with parallel ridges was determined (Fig. 2); the western boundary is found in Rold Skov (Pedersen & Jakobsen 2005) and the eastern boundary follows an ancient coastline in eastern Himmerland. The most impressive parallel ridges occur in a forested area east of Madum Sø where the top level of the ridge crests reaches an elevation of 95 m a.s.l. However, the majority of the crests are at 60–70 m a.s.l. and most of the ridges are c. 10–15 m high. The sediments in the ridges are dominated by coarse-grained sand and gravel, and accumulations of erratic boulders are found on the surface of the ridges.
Highlights
The glacial geology of Himmerland in the north-eastern part of Jylland, south of Limfjorden (Fig. 1) has never received any special attention
We studied sections in a small gravel pit at the northern boundary of Siem Skov (Figs 3, 4)
The aim of this paper is to describe the terrain with parallel ridges, which we interpret as ribbed moraines
Summary
The bedrock in Himmerland is dominated by Maastrichtian chalk which is exposed in pits throughout the region. Major parts of the region between Mariager Fjord and Limfjorden are covered by glaciofluvial sand that reaches a thickness of c. In the small gravel pit at the northern boundary of Siem Skov, the succession begins with a glaciolacustrine unit, which increases in thickness towards the east. This unit is interpreted as a palaeo-Kattegat deposit and may correlate with the Lønstrup Klint Formation in Vendsyssel (Pedersen 2005). It is overlain by glaciofluvial sand and gravel that may correlate with the Rubjerg
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