Lab Notes 2

Lab Notes 2 - Geologic Record-layers of rock stacked one...

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Geologic Record —layers of rock stacked one atop the other Fossils —any evidence of ancient life Relative age dating —the process of determining when something formed or happened in relation to other things Absolute age dating —the process of determining when something formed or happened in exact units of time Rock Units Corresponding (Division of the Geologic Record) Geologic Time Units Eonothem (largest) Eon of time (longest unit) Erathem Era of time System Period of time Series Epoch of time Stage Age of time Zone Chron of time 6 basic laws for determining relative age relationships among bodies of rock based on their physical relationships Law of Original Horizontality —Sedimentary layers (strata) and lava flows were originally deposited as relatively horizontal sheets Law of Lateral Continuity —Lava flows and strata extend laterally in all directions until they thin to nothing (pinch out) or reach the edge of their basin of deposition Law of Superposition —In an undisturbed sequence of strata or lava flows, the oldest layer is at the bottom of the sequence and the youngest is at the top Law of Inclusions —Any piece of rock (clast) that has become included in another rock or body of sediment must be older than the rock or sediment into which it has been incorporated Such a clast (usually a rock fragment, crystal, or fossil) is called an
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This note was uploaded on 09/20/2009 for the course GEOL 105 taught by Professor Platt,davis during the Spring '08 term at USC.

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Lab Notes 2 - Geologic Record-layers of rock stacked one...

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