It is misleading to say that by merely opening and closing your eyes, you could afftect the wave pattern. A more realistic example would be that you would need a flashlight to see the electrons, and when you turned it on, the photons from your flashlight interacting with the electron probability wave force it to collapse.
Wrong wrong wrong. The layers are dated using radiometric dating. You search for a material that retains a parent nuclide, but selectively rejects the daughter nuclides. For instance, while the material Zircon is forming, it retains Uranium and Thorium, and rejects Lead, one of the products of the uranium decay chain. By examining Zircon regions in rock, and measuring the Uranium-Lead ratio, you can tell how old a rock is.
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