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Geological Laws; Relative and Absolute Numerical Dating
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Includes tables of common radioactive parent isotopes and their stable daughter products, and half lives of common radioactive isotopes. Each card represents a particular rock layer with a collection of fossils that are found in that particular rock stratum. NAGT Reuse: Discuss the difference between relative time, ordering events by which happened first, and absolute time, the number of years ago each event happened. In addition, they learn the difference between relative time whether one event came before another and absolute time how many years ago something happened. If the letters "T" and "C" represent fossils in the oldest rock layer, they are the oldest fossils, or the first fossils formed in the past for this sequence of rock layers. More on this in later lessons. This is called relative dating. Geological Society of America.
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They should name the categories with a 1 word label that ends in the suffix —ian or —ic. Summary This simple lesson gets students accustomed to reading a Geologic Time Scale and understanding the organization of the information contained in it by creating a Personal Time Scale using events from their own lives.
The graptolite, placoderm, ammonite, ichthyosaur, and shark's tooth could possibly be used as index fossils since they are found in only one layer. Then, based on whatever organizational scheme makes the most sense to them, they divide their lives into eons. Starting with the top card, the letters should be in order from youngest to oldest.