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Styggforsen
Styggforsen is a waterfall and a nature reserve in Dalarna County, Sweden. It is part of the European Union-wide Natura 2000 network.〔
==Geography==
The waterfall is located in the village of Boda, 20 kilometres to the north of Rättvik. It lies at the eastern edge of the Siljan Ring,〔 a prehistoric impact crater which was formed 377 million years ago during the Devonian period when a meteorite struck the Earth's surface.〔 The bolide was estimated to be about 4 kilometres in diameter and was travelling at around 100,000 kilometres per hour, causing a vertical realignment of the horizontal rock strata and a depression of the bedrock upon collision. This had a profound effect upon the local environment, creating many of the geological features which exist to this day such as Lake Siljan to the south-west and Styggforsen.
The river Styggforsån is interrupted by the waterfall which is 36 meters high and composed of a column of Ordovician limestone. The base of the waterfall abuts a dike of brecciated quartz which is believed to predate the impact event.〔 The site is popular with tourists and it is encompassed by a circular path of about one kilometre that leads down to a cave called ''Troll Hole''. A cafe is open during the summer time and there is also an information centre nearby.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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