Va

Permian

Pennsylvanian

Mississippian

Nautiloid Cvn.

Buck Farm Cyn. Havasa Cyn.

Whitmore Cyn^< ^ Bright Angel Shi

Cambrian

Carbon Cyn. , .■ . „ Tapeats Ck. I v. '." Tapeats.

PRECAMBRIAN,

Buck Farm Cyn. Havasa Cyn.

Whitmore Cyn^< ^ Bright Angel Shi

PRECAMBRIAN,

A diagrammatic vertical section through Earth Time as represented by the succession of strata in the Grand Canyon (redrawn from Beus, S. S. and Morales, M., 2003).

depths of the Canyon, the eye scans down through another 275 million years to ancient sedimentary rocks that were originally deposited on the seabed at the beginning of Cambrian times, some 545 million years ago. And beyond that it descends yet further into Precambrian time before the bottom of the chasm is reached. Even then the viewer becomes aware that the whole rock story must continue beneath our feet into the Earth. If we could descend further, how far back could we go?

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