Lumparn
| Lumparn | |
|---|---|
| Lumpari | |
| File:Lumparn.png Lumparn with the impact structure area in grey | |
| Impact crater/structure | |
| Confidence | Confirmed |
| Diameter | 9 km (5.6 mi) |
| Age | ~1000 Ma Proterozoic |
| Exposed | No |
| Drilled | Yes |
| Location | |
| Location | Fasta Åland |
| Coordinates | Lua error in Module:Coordinates at line 489: attempt to index field 'wikibase' (a nil value). |
| Country | File:Flag of Finland.svg Finland |
| Province | Åland |
| District | Åland |
| Municipality | Sund, Lumparland, Lemland & Jomala |
| Lua error in Module:Location_map at line 411: Malformed coordinates value. | |
Lumparn (Finnish: 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
[edit | edit source]Most of the bay fills a nine kilometer wide impact structure. The structure is estimated to be about 1000 million years old (Proterozoic).[1] 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[2] in some Finnish documents, though the Research Institute for the Languages of Finland does not list Lumpari as in current usage.[3]
Gallery
[edit | edit source].jpg){kind=link}
See also
[edit | edit source]References
[edit | edit source]- ^ Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value).
- ^ Lumpari World Water Features Database | WorldCityDB.com Archived 2007-09-27 at the Wayback Machine
- ^ Svenska Ortnamn i Finland Archived 2007-11-13 at the Wayback Machine, The Research Institute for the Languages of Finland, see "Lumparn"
External links
[edit | edit source]- Lumparn impact structure (archived link)
- (in Finnish) The Landforms of Finland
- Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value).
- Map of Lumparn
