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Table of Contents

  1. Speaker Introduction
  2. Silence of the Clams: Reconstructing the history of the Colorado River using marine bivalves
    1. The Silence of the Clams...
    2. The Colorado River in Arizona is the major source of water...
    3. What impact has the complete utilization of the river had?
    4. The questions that we are really interested in can be broken down into a series.
    5. Some preliminary results...
    6. Using isotopes to answer fundamental questions:
    7. How can you use isotopes to calculate percentages of fresh or marine water?
    8. Using a mass spectrometer...
    9. Isotopes, carbonate based skeletons and paleotemperatures...
    10. Interpreting clam shell structure...
    11. What do the series of bands on the shell mean? The field of sclerochronology...
    12. Selecting field samples...
    13. Billions and billions of shells or cheniers...
    14. The world's biggest mud flats...it's just awful.
    15. We try to hike to the limits that we think we can push everybody to...
    16. You see nothing but shells of Mulinia as far as the eye can see...
    17. After collecting the shells, the first thing that we do is we age them.
    18. We can actually sample something that represents more into five days of growth.
    19. Isotopic profiles for fossil specimens...
    20. Now, here's where things get interesting...
    21. And sure enough, they show the arrival of the river.
    22. Well, there have been two issues that we can think of.
    23. Our burning question is why has Mulinia gone into such significant declines.
    24. Of course, we're not holding our collective breaths...
    25. Before I end...
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