Söderfjärden
Söderfjärden is the name of the plain of an impact crater 10 kilometers south of the city of Vaasa in the Finnish region of Ostrobothnia on the Gulf of Bothnia . The western part belongs to the municipality of Vaasa, the eastern part to the municipality of Korsholm .
The Proterozoic crater is at least 640 million years old, has a maximum diameter of 6.6 km and a maximum depth of 300 m. It is filled with Cambrian sandstone . Only the outer edge is still visible. There is also a buried central bump .
After the rise of the Baltic Sea floor due to the post-glacial uplift , Söderfjärden became a wetland, but it was drained in the 1920s. Today it is used for agriculture and is clearly visible from the air as a large, circular field. This makes Söderfjärden unique among other known impact structures in Finland that are at least partially submerged.
Söderfjärden is the northernmost major resting area for the gray crane in Europe.
Web links
Individual evidence
- ↑ Archived copy ( Memento of the original from May 5, 2015 in the Internet Archive ) Info: The archive link was inserted automatically and has not yet been checked. Please check the original and archive link according to the instructions and then remove this notice.
- ↑ Archived copy ( memento of the original from September 25, 2011 in the Internet Archive ) Info: The archive link was inserted automatically and has not yet been checked. Please check the original and archive link according to the instructions and then remove this notice.
