1 jan 370000000 ano antes da era comum - Siljan Ring

Descrição:

The Siljan Ring is a prehistoric impact structure in Dalarna, central Sweden. It is one of the 15 largest known impact structures on Earth and the largest in Europe, with a diameter of about 52 kilometres. The impact that created the Siljan Ring occurred when a meteorite collided with the Earth's surface during the Devonian period. The exact timing of the impact has been estimated at 376.8 Ma or at 377 Ma. This impact has been proposed as a cause of the first Devonian extinction, the Kellwasser Event or Late Frasnian extinction, due to it being believed by some researchers to coincide around the time of the Kellwasser event at 376.1 Ma, although the timing of this extinction event has since been pushed forward to 371.93–371.78 Ma. The effects of the impact can clearly be seen in the bedrock in the area. The Cambrian, Ordovician and Silurian sedimentary rocks deformed by the impact are rich in fossils.

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