description Keurusselkä Overview
Keurusselkä is a large, deeply eroded impact structure in central Finland, associated with the Keurusselkä lake system. Evidence for the impact includes shock-metamorphosed rocks and other geological features identified around the lake. Its age is approximately one billion years, placing its formation in the Precambrian, long before the appearance of complex terrestrial ecosystems.
help Keurusselkä FAQ
Where is Keurusselkä impact structure?
Keurusselkä is in central Finland and is associated with the Keurusselkä lake system. The evidence is spread through a deeply eroded landscape rather than preserved as a simple bowl.
How old is Keurusselkä impact structure?
Its age is approximately one billion years. Because the structure is deeply eroded, researchers rely on geological evidence rather than a complete visible crater.
What proves that Keurusselkä was formed by an impact?
Evidence includes shock-metamorphosed rocks and other geological features around the lake. Shock metamorphism means minerals were changed by the extreme pressures of a collision.
Is Keurusselkä a lake or a crater?
Keurusselkä is a lake system associated with a much older impact structure. The lake occupies part of a landscape shaped and later heavily modified by the ancient collision and erosion.
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