View source for Lumparn

{{Infobox terrestrial impact site
| name = Lumparn
| other_name = Lumpari
| photo = Lumparn.png
| photo_size = 
| photo_alt = 
| photo_caption = Lumparn with the impact structure area in grey
| map = Finland
| map_alt = 
| map_caption = Location of the crater in the Botnian Gulf
| map_size = 250
| location = [[Fasta Åland]]
| label = 
| label_position = 
| coordinates = {{coord|60|9|N|20|6|E|display=inline,title}}
| coordinates_ref = 
| confidence = Confirmed
| diameter = {{convert|9|km|mi|abbr=on}}
| depth = 
| rise =
| imp_size =
| age = ~1000 Ma<br>[[Proterozoic]]
| exposed = No
| drilled = Yes
| bolide = 
| translation =
| language =
| pronunciation =
| topo = 
| access = 
| country = {{flag|Finland}}
| state = 
| province = [[Åland]]
| district = [[Åland]]
| municipality = [[Sund, Åland|Sund]], [[Lumparland]], [[Lemland]] & [[Jomala]]
}}
'''Lumparn''' ({{langx|fi|Lumpari}}) is a large [[bay]] devoid of islands in the [[Fasta Åland|main island]] of [[Åland]], [[Finland]], bordered by [[Sund, Åland|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>{{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>

== Gallery ==
[[File:Lumparn (panorama).jpg|thumb|left|600px|Panorama over Lumparn, seen from the south coast. On the horizon, a small part of Sund is just visible.]]

{{clearleft}}
== See also ==
* [[Impact craters in Finland]]

== References ==
{{reflist}}

== External links ==
* [https://web.archive.org/web/20070927213438/http://www.somerikko.net/old/geo/imp/lumpa_e.htm Lumparn impact structure] (archived link)
* {{in lang|fi}}<!--Finnish--> [http://www.helsinki.fi/ml/maant/suomi.html The Landforms of Finland]
* {{cite journal | author=Svensson, N.-B. | title=Lumparn Bay: A Meteorite Impact Crater in the Aland Archipelago, Southwest Finland | journal=Meteoritics | year=1993 | volume=28 | issue=3 | pages=445 | bibcode=1993Metic..28S.445S }}
* [https://www.openstreetmap.org/#map=12/60.15/20.13333 Map of Lumparn]

{{Impact cratering on Earth}}

[[Category:Impact craters of Finland]]
[[Category:Proterozoic impact craters]]
[[Category:Mesoproterozoic Europe]]
[[Category:Landforms of Åland]]

{{Åland-geo-stub}}