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What do we use the fossil record for?

What do we use the fossil record for?. 3. Interpreting past environments. At any one time different sediments types are being deposited in different places. No one environment stretches indefinitely far in any direction. .

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What do we use the fossil record for?

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  1. What do we use the fossil record for? 3. Interpreting past environments At any one time different sediments types are being deposited in different places. No one environment stretches indefinitely far in any direction. http://www.geology.ohio-state.edu/~vonfrese/gs100/lect29/xfig29_02.jpg http://oceanworld.tamu.edu/students/coral/images/coral_reef_1.jpg http://www.wsgs.uwyo.edu/Coal/coal_brochure/images/fig1_swamp.jpg

  2. http://strata.geol.sc.edu/Bahamas/images/040-Heirarchy-of-Facies.jpghttp://strata.geol.sc.edu/Bahamas/images/040-Heirarchy-of-Facies.jpg

  3. http://csmres.jmu.edu/geollab/fichter/SedRx/carbdepoenvir.htmlhttp://csmres.jmu.edu/geollab/fichter/SedRx/carbdepoenvir.html

  4. http://csmres.jmu.edu/geollab/fichter/SedRx/meanderriver.htmlhttp://csmres.jmu.edu/geollab/fichter/SedRx/meanderriver.html

  5. Facies = all of the characteristics of a particular rock unit. The characteristics of the rock unit come from the depositional environment. Every depositional environment puts its own distinctive imprint on the sediment, making a particular facies. Thus, a facies is a distinct kind of rock for that area or environment. http://gpc.edu/~pgore/geology/geo102/facies.htm

  6. A = Sandstone facies (beach environment)B = Shale facies (offshore marine environment)C = Limestone facies (far from sources of terrigenous input) Each depositional environment grades laterally into other environments. http://gpc.edu/~pgore/geology/geo102/facies.htm

  7. http://www3.interscience.wiley.com:8100/legacy/college/levin/0470000201/chap_tutorial/ch12/images/le03_42.jpghttp://www3.interscience.wiley.com:8100/legacy/college/levin/0470000201/chap_tutorial/ch12/images/le03_42.jpg

  8. Transgression Onlap (Transgressive) Sequences Shifting Facies through Time Time Rock Unit Time Rock Unit Time Rock Unit Time Transgressive Unit Time Rock Unit Time Rock Unit Time Rock Unit Beach sandstone Near Shelf shale Far Shelf limestone Beach moves farther away Water gets deeper Sediment becomes finer FUS – Fining Upward Sequence = Transgressive Sequence

  9. Prograding Regression Offlap (Regressive) Sequences Shifting Facies through Time Time Transgressive Rock Unit Beach sandstone Time Rock Unit Time Rock Unit Time Rock Unit Time Rock Unit Time Rock Unit Near Shelf shale Far Shelf limestone Beach moves closer Water gets shallower Sediment gets coarser CUS – Coarsening Upward Sequence = Regressive Sequence

  10. Beach sandstone Time Transgressive Rock Unit Near Shelf shale Far Shelf limestone Beach sandstone Prograding Regression Beach moves farther away Near Shelf shale Water gets deeper Far Shelf limestone Sediment becomes finer Transgression Beach moves closer Water gets shallower Sediment gets coarser Transgressive Sequence Regressive Sequence

  11. Walther's Law = sedimentary environments that started out side-by-side will end up overlapping one another over time due to transgressions and regressions. The result is a vertical sequence of beds. The vertical sequence of facies Represents former adjacent depositional environments. Which sequence of rock layers represents a transgression? http://gpc.edu/~pgore/geology/geo102/facies.htm

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