The Victoria Island structure is a bowl-shaped structure buried in the shale sediments of the Sacramento-San Joaquin River Delta, west of Stockton, California. The circular structure is part of a former sea bed, and lies below sea level.Paul Rincon (2007). 'Crater' spied under California, BBC News
Discovered during oil exploration and reported at the Lunar and Planetary Science Conference in Houston, Texas, in March 2007, it is thought to be a buried impact crater formed between 37 and 49 million years ago.
Victoria Island, which the structure is named for, is in the San Joaquin River Delta at approximately . The current publications do not list a more precise location for the impact structure than the island.
See also List of possible impact structures on Earth
References
External links BBC News Aerial Exploration of the Victoria Island Structure