Assemblages of fossils refer to groups of several unique fossils occurring together.
Relative dating definition of three basic laws: a precise definition and features by determining the actual 'age, cc by-sa 4.
Principle of Cross-Cutting Relationships: Deformation events like folds, faults and igneous intrusions that cut across rocks are younger than the rocks they cut across.
The predominant white layer just below the canyon rim is the Coconino Sandstone.
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Strata that are cut by a canyon later remain continuous on either side of the canyon.