Karikkoselkä
| Karikkoselkä | ||
|---|---|---|
Primary inflows Könkköjoki | | |
| Primary outflows | Autionsalmi | |
| Basin countries | Finland | |
| Max. depth | 26 m (85 ft)[1] | |
| Surface elevation | 111.1 m (365 ft)[1] | |
| References | [1] | |
Karikkoselkä is a
glaciation
, but Karikkoselkä is strikingly round.
Many shatter cones, rock formations that form under the extreme pressures of impact, have been found around the lake. Further evidence comes from aeromagnetic maps, which show a clear magnetic anomaly in the impact crater area.[3] In addition, samples collected from deep drillings into the lake bottom confirm the impact origin of the structure.
The crater is the smallest identified in Finland, 1.4 km diameter and 150 m deep. Due to
misquotation – the discovery paper mentions that the bedrock in the region (known as the Central Finland Granite Complex) formed about 1.88 Ga (thousand million years ago), in the late Paleoproterozoic era.[2][3]
There is evidence of a neolithic settlement on the southern shore of the lake.[6] According to a plate erected there no excavations have yet been conducted and the age of the settlement remains unknown.
See also
- Impact craters in Finland
Lakes portal
References
- ^ a b c Citizen's MapSite
- ^ a b Moilanen, Jarmo. "Karikkoselkä impact structure". Impact structures in Finland. Archived from the original on September 27, 2007. Retrieved 2006-05-08.
- ^ Bibcode:1996LPI....27..739L.
- ^ "Karikkoselkä". Earth Impact Database. Planetary and Space Science Centre University of New Brunswick Fredericton. Retrieved 2009-08-19.
- ^ "Karikkoselkä". Earth Impact Database. Retrieved 2006-05-08.
- ^ "Petäjäveden kulttuuriympäristö". 2006-06-22. Archived from the original on 2007-09-30. Retrieved 2007-08-30.
External links
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| Confirmed≥20 km diameter |
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