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There is a ridge formation in the area of ​​the reef, which was created during the ice age during the melting of the continental glacier. The area has been covered by a thick glacier, the edge of which was around 12 years ago at 000. Salpauselka. About 1 years ago, the edge of the melting glacier had receded to the 11nd Salpausellä. In the meantime, the area of ​​Riutta, located between Salpauselkki, was freed from the ice.

The melting and receding glacier had channels and tunnels where glacial rivers formed from the melting waters of the glacier flowed. The stone material transported with the water was deposited and sorted at the bottom of the tunnels and crevices according to the flow speed: during a slow flow, fine soil types such as sand, grit and silt were deposited at the bottom of the bed, and during a faster flow, the flow also transported coarse material such as stones and gravel. This is also how Riutta's ridge was born, which is part of the ridge formation that stretches from Launos through Kormu and Ansalanmäki to Riutta. The ridge is oriented according to the retreating direction of the glacier, i.e. from southeast to northwest.