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This stimulation releases the trapped electrons as a photon of light which is called luminescence. Foraminifera, single-celled organisms with calcareous shells, are an example of an especially useful index fossil for the Cretaceous Period and Cenozoic Era. Upon death, the phosphatic hard parts were scattered into the rest of the marine sediments. This produces one of two different effects: 1 an electron jumps in to fill the missing spot of the departed electron and emits an X-ray, or 2 in what is called the Auger process, another electron is released and changes the atom into an ion. Relative Dating Lesson Plan. The final events affecting this area are current erosion processes working on the land surface, rounding off the edge of the fault scarp, and producing the modern landscape at the top of the diagram. Answering this frequently encountered question in geology requires two separate steps.

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