| Victoria Island structure | |
| Map: | California |
| Coordinates: | 37.89°N -121.535°W |
| Confidence: | probable |
| Diameter: | 5.5km (03.4miles) |
| Exposed: | No |
| Drilled: | No |
| Country: | United States |
| State: | California |
| District: | San Joaquin County |
The Victoria Island structure is a 5.5km (03.4miles) bowl-shaped structure buried in the shale sediments of the Sacramento-San Joaquin River Delta, 12miles west of Stockton, California. The circular structure is part of a former sea bed, and lies 1,490–1,600 meters (4,890–4,250 ft) below sea level.[1]
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.[2] [3]
Victoria Island, which the structure is named for, is in the San Joaquin River Delta at approximately 37.89°N -121.535°W. The current publications do not list a more precise location for the impact structure than the island.