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Structure on the Canadian Seabed Identified as Meteorite Crater By New Research
The majority of the earth’s impact craters have been studied on land; however, new seafloor mapping projects have led to the discovery of unexplored geological structures. New research, published in Meteoritics & Planetary Science, examines such a crater on the seabed of the Gulf of St. Lawrence, south of the Canadian city of Sept-Iles.
The crater, which lies 40 m under the ocean, is 4 km in diameter, 185 m deep and is named 'Corossol', after a ship from the fleet of King Louis XIV which sank in the area in 1693. Using bathymetric and geophysical techniques the research team identified the site as a meteorite impact crater, as it forms a circular structure with a central peak and concentric rings that is geometrically typical of complex impact craters.
The team report that while the age of the crater is unknown, its geological setting indicates that it was formed long after the Mid-Ordovician (470 million years ago) and before Quaternary glaciations (2.6 million years ago).