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Journal of Quaternary technology, 5:3

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Aerial photograph of the snout vicinity of Eyjabakkaj5kull, a northeastern outlet glacier of Vatnaj6kull. Scale bar is 500 m long; north shown by arrow. Airphoto copyright Landmaelingar Islands 1967; reproduced with permission. EyjabakkajOkull is an outlet glacier of VatnajOkull Ice Cap in southeastern Iceland (Map 2). 5 km wide), Eyjabakkajokull is small when compared with Pleistocene ice sheets and glaciers. Consequently, glaciotectonic features at this site are similarly small in size. The position of the ice margin has fluctuated over a distance of several km in the last century as a consequence of the glacier's surge behavior (paterson 1981).

The ridges are developed on the crests of folds or the upturned ends of thrust blocks. A close correspondence typically exists between structural features and f -100 m 1 few km - - - ICE-SHOVED TERRAIN Fig. 3-1 . Schematic block diagram of typical thrust structure of large composite-ridges. Arcuate pattern reflects movement of an ice lobe from the right. 29 30 CHAPTER 3 Fig. 3-2. Aerial photograph of Flade Klit, northern Denmark. Composite-ridges fonn an open crescent, concave northward. Location of cliff exposure at Hanklit (Plate I) shown by arrow; Salgjerh~j (solid dot) is high point at 88 m; adjacent water body is the Limfjord estuary.

The history of geologic study for Sheridan County was reviewed by Bluemle (1981), who described the morphology and structure of Prophets Mountains. Sub-drift bedrock in Sheridan County consists of upper Cretaceous Hell Creek Formation and lower Tertiary Cannonball Formation (fig. 3-15). The Hell Creek Formation is comprised of interbedded sandstone, mudstone, carbonaceous shale, and thin lignite of terrestrial origin. The overlying Cannonball Formation includes marine carbonaceous and lignitic siltstone, shale, and micaeous sandstone.

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