Major North American oil source yields clues to one of Earth's deadliest mass extinctions

The Bakken Shale Formation—a 200,000-square-mile shale deposit below parts of Canada and North Dakota—has supplied billions of barrels of oil and natural gas to North America for 70 years. A new discovery reveals that the rocks also open a uniquely informative window into Earth’s complicated geological history.


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Source: Phys.org