A combination of data from litho‐ and biofacies and gamma‐ray spectrometry indicates an upward marine shallowing in the late Rhaetian succession of Nevada followed by deepening in the early Hettangian, which conforms well to a regression–transgression couplet of the sort associated with many marine mass extinctions. This pattern can be discerned widely across the world, most notably in North and South America and in Europe, suggesting the operation of eustatic control of sea level, a global fall being followed by a rise.

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