GEL 107 (2) - GEL107 PALEOBIOLOGY Lecture 3 Biostratigraphy...

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1 1 GEL107: PALEOBIOLOGY Lecture 3: Biostratigraphy & timescale Sue the Tyrannosaurus rex at the Field Museum in Chicago is 65 million years old. Help me! I cannot imagine such a long time period. How do we know it? 3 How long is the geologic time scale? What is relative age and how do we use it to tell how old a fossil organism is? What are the important time period names? Where are fossils found? How do we put actual numbers (absolute age) on relative age? What fossils are used as index fossils? What are the problems of biostratigraphy?
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