The size of the Great Unconformity also differs across the canyon, with a smaller gap to the east, Peak said. At its smallest, the gap covers about 250 million years.

Unconformity: An interruption between layers of rock, in which the upper layer is much younger (even by more than a billion years) than the lower layer.

The 'Great Unconformity' represents a lapse of between 100 million and a billion years in Earth's geological record Geologists analyzed the history of heat in rocks at the natural wonder ...

The Great Unconformity which took place in North America, the team suggested, was likely caused by the breakup of the supercontinent Rodinia 700-800 million years ago, bringing older rock to the ...

Thermochronologic constraints on the origin of the Great Unconformity. Proceedings of the National Academy of Sciences, 2022; 119 (5): e2118682119 DOI: 10.1073/pnas.2118682119 ...