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Principles - Principles of Historical Geology Geology 331...

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Principles of Historical Geology Geology 331
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Principles Principle of Superposition Principle of Original Horizontality Principle of Original Lateral Continuity Principle of Intrusive Relationships Principle of Cross-Cutting Relationships Principle of Fossil Succession ± will discuss in Biostratigraphy Section
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Principle of Superposition In any undeformed sequence of sedimentary rocks, each bed is younger than the one below it and older than the one above it. This is the basis of relative ages of all strata and their contained fossils.
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Original Horizontality - Sediments usually form flat- O\LQJ GHSRVLWV RQ WKH HDUWK¶V VXUIDFH²
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Original Horizontality - Sedimentary rocks are horizontal because the original sediments were horizontal.
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Original Horizontality ± These layers were once horizontal. Why are they now tilted?
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Principle of Original Lateral Continuity Strata originally extended in all directions until they thinned to zero at their edges of deposition.
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