Victoria Island structure, Subsurface impact crater in San Joaquin River Delta, California, US.
Victoria Island structure is a subsurface geological formation buried deep beneath the Sacramento-San Joaquin River Delta in California. It displays a circular basin with a central peak and concentric ring patterns characteristic of impact structures.
The formation originated 37 to 49 million years ago during the Eocene epoch and was discovered accidentally during oil exploration in the early 2000s. Scientific examination indicated an ancient meteorite impact had created this buried structure.
Scientists presented their findings about this circular basin formation at the Lunar and Planetary Science Conference in Houston, Texas, during March 2007.
Researchers study the formation using seismic surveys and well log data collected from beneath the surface. The subsurface location means access is only possible through geophysical measurements rather than direct site visits.
The structure features a central uplifted peak surrounded by major normal faults - a combination rarely seen so clearly in other known impact craters. This arrangement provides scientists with unusual insight into how ancient meteorite impacts shaped subsurface geology.
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