E&E 151 S Introductory Geology: Chapters 8.4 - 8.5 (Geologic Time Pt. 2) Visualization Study

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7 Terms

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Relative Age

The age of a rock layer or geologic event relative to others, established using structural clues rather than numerical numbers.

<p><span>The age of a rock layer or geologic event relative to others, established using structural clues rather than numerical numbers.</span></p>
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Superposition

In undeformed rock layers, older layers lie at the bottom and younger layers lie at the top.

<p><span>In undeformed rock layers, older layers lie at the bottom and younger layers lie at the top.</span></p>
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Original Horizontality

Layers of sediment are originally deposited horizontally.

<p><span>Layers of sediment are originally deposited horizontally.</span></p>
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Lateral Continuity

Layers of sediment initially extend laterally in all directions.

<p><span>Layers of sediment initially extend laterally in all directions.</span></p>
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Cross-cutting Relationships

A feature or intrusion (such as a dike or fault) that cuts across another rock body must be younger than the rock body it cuts through.

<p><span>A feature or intrusion (such as a dike or fault) that cuts across another rock body must be younger than the rock body it cuts through.</span></p>
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Unconformity

A buried erosion surface representing a gap in the geological record.

<p><span>A buried erosion surface representing a gap in the geological record.</span></p>
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Principle of Faunal Succession

The principle used for worldwide correlation of rock strata based on the distinct, observable sequence of fossils they contain.

<p><span>The principle used for worldwide correlation of rock strata based on the distinct, observable sequence of fossils they contain.</span></p>