Abstract
New evidence on distribution and chronology of glaciations in southern Jylland is presented. Ten stratigraphic units including four till-formations have been identified in Middle- and Late Pleistocene sediment successions. The timing of successive glaciations and periglacial interludes based on luminescence dating is established for the past c. 200 kyr. The OSL-chronology predicts that deposition of Lillebælt Till (Late Saalian, Warthe Glaciation) occurred at 180-160 kyr. Deglaciation followed and barren periglacial environments existed until beginning of the Eemian. Periglacial conditions were restored c. 115 kyr ago and lasted well into the Middle Weichselian. Expansion of the Scandinavian Ice Sheet through the Baltic depression into southern Jylland caused deposition of Ristinge Klint Till (Ristinge Glaciation) c. 55–50 kyr ago. Glaciers flowed westwards beyond the Main Stationary Line (MSL) and may have terminated along ice showed ridges in the periglacially smoothed landscape east of the present North Sea coast. This traditionally named “Old Baltic”glaciation is now recognized elsewhere in the circum Baltic region besides Denmark. Deglaciation was succeeded by periglacial environments with cryoturbation, ice wedge growth, formation of wind abrasion pavements and low arctic habitats. Approaching the global glacio-eustatic low stand of the Last Glacial Maximum increased cooling and enhanced down slope creep caused widespread solifluction. In a sequence of Late Weichselian glacier advances, Mid Danish Till, East Jylland Till and Bælthav Till was deposited under progressing deglaciation between 25 and 18 kyr ago. Retarded melting of dead ice from the Ristinge Glaciation formed thermo karst depressions on the surfaceof outwash plains in front of MSL.
Highlights
In 1935, a partial plesiosaur skeleton was discovered in Lower Kimmeridgian (Upper Jurassic) strata on the east coast of the island of Milne Land, Scoresby Sund, Greenland (Fig. 1)
This specimen (MGUH 28378) (Fig. 2A, B) was described and figured as the holotype and only known specimen of a new species of Apractocleidus Smellie 1916
Re-examination of MGUH 28378 indicates that von Huene (1935) did make some errors in his interpretation
Summary
In 1935, von Huene identified the partial skeleton of a fossil reptile from the Kimmeridgian of Milne Land, Greenland, as part of a plesiosaur. In 1935, a partial plesiosaur skeleton was discovered in Lower Kimmeridgian (Upper Jurassic) strata on the east coast of the island of Milne Land, Scoresby Sund, Greenland (Fig. 1) This specimen (MGUH 28378) (Fig. 2A, B) was described and figured (von Huene, 1935) as the holotype and only known specimen of a new species of Apractocleidus Smellie 1916 (at the time considered a subgenus of Cryptoclidus Seeley 1892). Aldinger, who discovered the specimen in 1933 during a Danish expedition on the east coast of Milne Land, and transported it to the Geologisk Museum in Copenhagen, Denmark In his 1935 publication, von Huene reconstructed the girdle elements of Cryptoclidus (Apractocleidus) aldingeri. The relative orientation or the slabs was inferred from aligning the curvature of the humerus border on respective slabs but such a technique is open to minor error
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