Editing Lumparn (section)

== 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>{{cite Earth Impact DB | name = Lumparn| accessdate = 2009-08-15}}</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]]) [[limestone]]s. This makes Lumparn one of the few places in Finland where [[fossil]]s have been found.

The bay has also previously been referred to as ''Lumpari''<ref>[http://water.worldcitydb.com/lumpari_1978598.html Lumpari World Water Features Database | WorldCityDB.com<!-- Bot generated title -->] {{webarchive|url=https://web.archive.org/web/20070927035612/http://water.worldcitydb.com/lumpari_1978598.html |date=2007-09-27 }}</ref> in some [[Finnish language|Finnish]] documents, though the [[Research Institute for the Languages of Finland]] does not list ''Lumpari'' as in current usage.<ref>[http://kaino.kotus.fi/www/verkkojulkaisut/ortnamn/ortnamn2.html#L Svenska Ortnamn i Finland] {{webarchive|url=https://web.archive.org/web/20071113223403/http://kaino.kotus.fi/www/verkkojulkaisut/ortnamn/ortnamn2.html |date=2007-11-13 }}, The Research Institute for the Languages of Finland, see "Lumparn"</ref>