Proterozoic impact craters

largest verified impact crater on earth, dating from the Paleoproterozoic Era

second largest verified astrobleme on earth, remain of an Paleoproterozoic Era impact

Suavjärvi (in Karelian, Russian: ) is a lake in the Republic of Karelia, Russia about 50 km north of the town of Medvezhyegorsk. The lake is approximately wide.

Keurusselkä is a lake in Central Finland between the towns of Keuruu to the north and Mänttä to the south. It covers an area of . Its average depth is with a maximum depth of . The surface lies at above sea level. The lake is long and is a part of the Kokemäenjoki River basin. Keurusselkä gained international publicity in 2004 when a pair of amateur geologists discovered an ancient impact structure on the western shore of the lake.

impact crater in South Australia, Australia

Oldest known impact structure in the world, in Western Australia

alt=Sunset at lake Suvasvesi|thumb|Sunset at lake Suvasvesi Suvasvesi is a lake in Eastern Finland near the city of Kuopio. Suvasvesi consists of two circular open lakes, Kuukkarinselkä in north and Haapaselkä in south. The lakes are separated by a group of islands. The lake has 688 islands in total. The area of the lake is making it the 18th largest lake in Finland. Kuukkarinselkä is the third deepest lake in Finland measuring in the deepest point.

impact crater in United States

Lumparn () is a large bay devoid of islands in the main island of Åland, Finland, bordered by Sund to the north, Lumparland to the east, Lemland to the south and Jomala to the west.

Sääksjärvi () is a lake in Kokemäki, Satakunta, western Finland, east from the town of Pori. The lake is notable because it overlies an impact crater.

impact structure in Western Australia

impact crater of Northern Territory Australia

thumb|250px|View of the basin of the crater remnant from Öjberget, a hill that belongs to the Rim (crater)|crater rim Söderfjärden is a polder in Ostrobothnia, western Finland, 10 kilometres south of the town of Vaasa. The plain is in an impact crater dating back to more than 640 million years ago (Proterozoic, near the end of the Cryogenian). The crater's diameter is and its maximum depth is . It is filled with Cambrian sandstones leaving only the outer rim visible. There is also a central uplift, which is buried. After rising from the sea due to post-glacial rebound, Söderfjärden was a wetla

crater in Ontario, Canada

impact crater in Northern Territory, Australia

impact crater of Northern Territory, Australia

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.

lake

impact crater in Western Australia

impact crater in Northern Territory, Australia