Discuss the geologic time scale. How are time units determined in the Precambrian? How does this differ with time units of the Phanerozoic Eon? Be sure to include why the boundaries and units of the geologic time scale have been modified since the time scale's original inception.
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Home » Geography » This question must be at least 3 sentences long: Discuss the geologic time scale. How are time units determined in the Precambrian? How does this differ with time units of the Phanerozoic Eon?