The term Great Unconformity was first used in the year 1869 to describe the prominent stratigraphic surface in the Grand Canyon that separates the shallow marine, ∼525-Myr-old Cambrian Tapeats ...

First noticed by John Wesley Powell in 1869 in the layers of the Grand Canyon, the Great Unconformity, as it's known, accounts for more than one billion years of missing rock in certain places.

“We may need to change our language if we want to think about the Great Unconformity as being more complicated, forming at different times in different locations and for different reasons.

There were thousands of feet of missing rock – it had just vanished. He named this feature The Great Unconformity, and asked himself, "how can this be?". Today geologists know that the youngest ...

"The Great Unconformity sets the stage for the Cambrian explosion of life, which has always been puzzling since it is so abrupt in the fossil record—geological and evolutionary processes are ...

Geologists call it the Great Unconformity, and it refers to more than one billion years’ worth of missing rock in various places around the globe, including the Grand Canyon. Huge chunks of geologic ...

This strange phenomenon is called the Great Unconformity, and for over a century it’s been one of the biggest mysteries in geology. But new research published in the Proceedings of the National ...

But sometimes, the absence of geological records is just as telling as their presence. The Great Unconformity, a missing chunk of time that appears in rocks across the world, is the ultimate example ...