Iso-Naakkima
Sign in to saveIso-Naakkima is a lake in Southern Savonia, Finland, about 10 km south of the town of Pieksämäki. It is notable for having an eroded impact crater under the northwestern part of the lake. It is one of the oldest known, about 1200 million years old (900–1200 Ma, Mesoproterozoic). Of the known craters older than a billion years old, it is also one of the smallest being only 3 km in diameter.
In the Vinony graph
Within Vinony's link graph, Iso-Naakkima is referenced by 6 other articles, and connects out to Europe, Finland and lake.
The entry is geolocated on the map.
Vinony files it under Earth Impact Database, Impact craters of Finland and Kymi basin.
Its subject is documented across 7 Wikipedia language editions.
Wikidata facts
- Country
- Finland
- Located in
- Pieksämäki
- Area
- 11.2121
- Elevation
- 111
- Diameter
- 3
- Perimeter
- 31.583
Show 2 more facts
- basin country
- Finland
- native label
- Iso-Naakkima
Sources (1)
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Encyclopedic overview
3 sectionsContents
- See also
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- External links
Iso-Naakkima is a lake in Southern Savonia, Finland, about 10 km south of the town of Pieksämäki. It is notable for having an eroded impact crater under the northwestern part of the lake. It is one of the oldest known, about 1200 million years old (900–1200 Ma, Mesoproterozoic). Of the known craters older than a billion years old, it is also one of the smallest being only 3 km in diameter.
At the time of the impact event, the continent of Baltica (modern northeastern Europe) was located near the equator. The crater is filled by recent (Quaternary) sediments and is not visible to the surface. Its existence was revealed by strikingly circular geophysical anomalies which are concentrated in a region 3 km in diameter; the actual remnant is about 2 km wide and 160 m deep. Its existence was later confirmed by drilling results. The discovery was made in 1989 and therefore Iso-Naakkima is the fourth known impact structure in Finland.
Excerpted from Wikipedia’s “Iso-Naakkima” article, available under the CC BY-SA 4.0 licence.