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Geologic Time and Earth’s

Geologic Time and Earth s Biological HistoryDesigned to meet South Carolina Department of Education 2005 Science Academic Standards What is the Geologic Time Scale? (slide 4)Standard `Epochs, Eons, Eras, and Periods (slide 4) How was the time scale and it s divisions created? (slide 5) A complete Geologic Time Scale with references to (slides 6-7)Table of Contents Principles of the Geologic Time Scale (slide 8) Principles of Superposition, Horizontality and Original lateral continuity Principle of biologic succession (slide 9) Charles Lyell, the Principle of cross-cutting relations & Inclusion principle (slide 10) Charles Darwin Relative Age Dating using unconformities (slide 10)Standard Relative Age dating using cross-cutting relations and index fossils (slide 11) Absolute Age dating (slide 13) Isoto

Eons: Longest subdivision; based on the abundance of certain fossils Eras: Next to longest subdivision; marked by major changes in the fossil record Periods: Based on types of life existing at the time Epochs: Shortest subdivision; marked by differences in life forms and can vary from continent to continent. Table of Contents 4

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