They form a huge wedge of sediment deposited in a deep water basin and stretch from north of the Brooks Range beneath the Alaska North Slope to the adjacent offshore.
The USGS found large-scale folds and faults in the South of the formation and evidence, that the rocks have been heated to temperatures at which oil is converted to natural gas.
[1] The Torok Formation was deposited on the floor of the Alaska North Slope basin.
[1] In 2016, oil discovery in the deeper Torok Formation of more than 1.0 billion barrels (160 million cubic meters) was announced at Smith Bay, less than 1 mile (1.6 km) offshore from the NPR-A.
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