Some rocks below the Great Unconformity are 1.2 billion years ... Originally, they had been laid down as horizontal beds, mostly in rivers or shallow seas. Then the sediments hardened over time ...

“The Great Unconformity is one of the first well-documented geologic ... Then there there’s a cutoff, and above that you have these beautiful horizontal layers that form the buttes and peaks that you ...

The rocks above the Great Unconformity are about 520 million ... But it’s not a perfect timeline: below the horizontal bands we associate with the Grand Canyon, the canyon’s walls suddenly ...

"The Great Unconformity is one of the first well-documented ... Then there there's a cutoff, and above that you have these beautiful horizontal layers that form the buttes and peaks that you ...

This "Great Unconformity" has rocked the scientific ... Then there's a cutoff, and above that you have these beautiful horizontal layers that form the buttes and peaks that you associate with ...

That is, until you get deep into the canyon and find the Great Unconformity, a gap between rock layers representing a billion years in some places. Even stranger, the Great Unconformity shows up ...

One of the biggest geological mysteries surrounding our planet is known as The Great Unconformity. It refers to the disappearance of a significant portion of Earth’s crust, a gap in the ...

The red line between the underlying and tilted (nearly vertical) sedimentary layers and the overlying less tilted (nearly horizontal) strata is an angular unconformity. In this case, the rocks ...

Cambrian sandstone rests on much older basement rock called Vishnu schist in a section of Blacktail Canyon in Arizona that shows the Great Unconformity. Photograph by Earth Gallery Photograph ...

Thirty years later, groups are no closer to increasing protections for the area made up of Frenchman Mountain, Rainbow Gardens and the Great Unconformity — a slab of exposed rock that reveals a ...

"The Great Unconformity is one of the first well-documented ... Then there there's a cutoff, and above that you have these beautiful horizontal layers that form the buttes and peaks that you ...