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This diagram represents the sequence of rock units
exposed in the Grand Canyon. Using geologic dating principles
and fossils preserved in the layers, the ages of each
layer have been established. The letters to the left
of each layer in the diagram show abbreviations for
the geologic time periods when the rocks formed.
! Move your cursor over the rock layers for the name
and timing of each period. Use the information to answer
the two questions below.
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