W10_103_4a_stratigraphy1

W10_103_4a_stratigraphy1 - • Original Horizontality •...

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Stratigraphy The study of the origin, relationship and extent of rock layers (Strata). Lithostratigraphy Each layer is a different rock type. Chronostratigraphy Each layer is a different age. Biostratigraphy Each layer contains a different fossil assemblage.
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Lithostratigraphic Units Supergroup Group A Formation A Member A Member B Member C Formation B Member D Member E Member F Formation C Member G Member H Group B Formation D Member I Member J Member K Member L Member M Formation E Member N Member O Member P Member Q Formation F Member R Member S Member T Supergroup | Group | Formation | Member | Bed Lithostratigraphic Example: Grand Canyon
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How do we Illustrate Stratigraphy? •Stratigraphic Columns •Cross Sections •Geologic Maps Stratigraphic Column: John Day Fossil Beds NM
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Geologic Maps Snoqualmie Pass Chronostratigraphic Map of Washington
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Cross Sections Principles (Laws) of Stratigraphy Principle of…
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Unformatted text preview: • Original Horizontality • Superposition • Lateral Continuity • Cross Cutting Relationships • Inclusions • Faunal Succession Walther’s Law Nicholas Steno 1. Principle of Original Horizontality 2. Principle of Superposition Youngest Strata Oldest Strata 3. Principle of Lateral Continuity Lateral Continuity Charles Lyell 4. Principle of Cross Cutting Relationships 5. Principle of Inclusions 6. Principle of Faunal Succession Sketch by Baron Cuvier (1769-1832) William “Strata” Smith 6. Principle of Faunal Succession " . . . each stratum contained organized fossils peculiar to itself, and might, in cases otherwise doubtful, be recognized and discriminated from others like it, but in a different part of the series, by examination of them." Biostratigraphy Defined by first and last appearance of index fossils and/or fossil assemblages Superzone - Biozones- Subzones Diatoms...
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W10_103_4a_stratigraphy1 - • Original Horizontality •...

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