Manicouagan Crater

Manicouagan Crater

Courtesy of NASA/LPI


The Manicouagan Crater in Quebec province, Canada, is one of the largest impact craters still preserved on the surface of Earth. It is believed that an asteroid about 5 km in diameter smashed into Earth about 215 million years ago during the Triassic Period. This ring-shaped structure may have been caused by multiple impacts that melted the surface and splashed out to form an erosion resistant layer. Much of the original 100 km diameter rim has been eroded away by glaciers.