In the middle
At the top
At the bottom
In a diagonal
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Erosion
Isotopes
Precambrian
Faults
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Intrusion
Extrusion
Unconformities
Uniformitarianism
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Trace
Mold
Cast
Index
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Absolute; igneous
Absolute; metamorphic
Relative; sedimentary
Relative; metamorphic
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Hermit shale
Toroweap Formation
Kaibab Limestone
Coconino Sandstone
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Layer K
Layer I
Layer E
Layer A
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Different
Older
Younger
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