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Lumparn

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Lumparn

Lumparn (fi. Lumpari) is a large bay devoid of islands in the Main Island of Ă…land, Finland, bordered by Sund to the north, Lumparland to the east, Lemland to the south and Jomala to the west.

Map of Lumparn, %C3%85land Islands

Most of the bay fills a nine kilometer wide impact crater. The crater is estimated to be about 1000 million years old (Proterozoic). The depression was originally believed to be a rift. Extraterrestrial origin was first proposed in 1979, but not until 1993 was the impact structure finally confirmed. Long shatter cones have been discovered in the southwestern part of the bay. The crater is filled with sediments, between Pleistocene sediments and crushed rapakivi granite bedrock there is a layer of Paleozoic (Ordovician) limestones. This makes Lumparn one of the few places in Finland where fossils have been found.

The bay has also previously been referred to as Lumpari in some Finnish documents, though the Research Institute for the Languages of Finland does not list Lumpari as in current usage.

References

Lumparn Wikipedia


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