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| Burgsvik beds : ウィキペディア英語版 | Burgsvik beds
The Burgsvik beds are a sequence of shallow marine limestones and sandstones found near the town of Burgsvik in the southern part of Gotland, Sweden. The beds were deposited in the Upper Silurian period, around , in warm, equatorial waters frequently ravaged by storms, in front of an advancing shoreline. The Burgsvik Formation comprises two members, the Burgsvik Sandstone (on which this article focusses) and Burgsvik Oolite. ==Appearance== The beds consists of thin to very thick layers of a light grey, fine grained argillaceous sandstone, containing a small calcareous element. The sandstones are occasionally intercalated with very thin-bedded blue-grey claystone. In places, the sandstone is overlain by the upper Burgsvik beds, which comprise thin-bedded, light-to-bluish grey, oolitic limestone with, here and there, alternating sandy beds containing problematic structures described by Manten (1966).
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