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http://paleo.cortland.edu/tutorial/Timescale/Timescale3.GIF

http://paleo.cortland.edu/tutorial/Timescale/Timescale3.GIF. Figure F7. Cenozoic events in climate, tectonics, and biota vs. d 18 O and d 13 C in benthic foraminiferal calcite (after Zachos et al., 2001). VPDB = Vienna Peedee belemnite

MikeCarlo
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http://paleo.cortland.edu/tutorial/Timescale/Timescale3.GIF

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  1. http://paleo.cortland.edu/tutorial/Timescale/Timescale3.GIF

  2. Figure F7. Cenozoic events in climate, tectonics, and biota vs. d18O and d13C in benthic foraminiferal calcite (after Zachos et al., 2001). VPDB = Vienna Peedee belemnite http://odp.pangaea.de/publications/207_IR/chap_01/c1_f7.htm#60367

  3. http://www.ruf.rice.edu/~leeman/GeoTimeSpiral.gif

  4. “Outcrop” or cross section view • Types of rocks based on geometry? (sedimentary, igneous, metamorphic) • Order of events? http://serc.carleton.edu/quantskills/methods/quantlit/DeepTime.html

  5. Guiding principles geologist use when examining a rock outcrop to determine order of events • principle of uniformitarianism: • physical processes acting today also acted in the past at comparable rates • -- the present is the key to the past; • principle of superposition: • younger sedimentary rocks overlie older rocks because a layer of sediment cannot • accumulate unless there is already a substrate on which it can collect • principle of original horizontality: • sedimentary rocks are deposited relatively horizontally because they settle out of fluid in • a gravitational field -- folds and tilted beds indicate deformation that postdates deposition; • principle of original continuity: • sedimentary rock units accumulate in continuous sheets, a layer exposed on one side of • a canyon likely spanned the canyon at one time; http://serc.carleton.edu/quantskills/methods/quantlit/DeepTime.html

  6. Guiding principles geologist use when examining a rock outcrop to determine order of events • principle of cross-cutting relationships: • a feature that cuts across another is younger than that which it cuts; • principle of inclusions: • igneous and sedimentary rocks that contain inclusions of other rocks must be younger • than the rocks they include • principle of baked contacts: • an igneous intrusion "bakes" the rock surrounding it. http://serc.carleton.edu/quantskills/methods/quantlit/DeepTime.html

  7. In this image, A is younger than C (superposition), C is younger than I (inclusions, cross cutting), I is younger than D, E and B (cross-cutting), D (the fault) is younger than E and B (cross-cutting), H, F, K and J have been tilted or folded (original horizontality), G is younger than B, H, F, K and J (baked contacts). In order from youngest to oldest, the sequence is as follows: A, C, I, D (faulting), E, G, B, tilting, H, F, K. J. http://serc.carleton.edu/quantskills/methods/quantlit/DeepTime.html

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