Lumparn

Template:Infobox terrestrial impact site Lumparn (fi. Lumpari) is a large bay devoid of islands in the main island of Åland, Finland, bordered by Sund to the north, Lumparland to the east, Lemland to the south and Jomala to the west.

Description

Most of the bay fills a nine kilometer wide impact structure. The structure is estimated to be about 1000 million years old (Proterozoic).<ref>Template:Cite Earth Impact DB</ref> 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 remains of the crater are 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<ref>Lumpari World Water Features Database | WorldCityDB.com Template:Webarchive</ref> in some Finnish documents, though the Research Institute for the Languages of Finland does not list Lumpari as in current usage.<ref>Svenska Ortnamn i Finland Template:Webarchive, The Research Institute for the Languages of Finland, see "Lumparn"</ref>

Gallery

File:Lumparn (panorama).jpg

Panorama over Lumparn, seen from the south coast. On the horizon, a small part of Sund is just visible.

See also

• Impact craters in Finland

External links

• Lumparn impact structure (archived link)
• Template:In lang The Landforms of Finland
• Template:Cite journal
• Map of Lumparn