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Principles of Radiometric Dating. Extinction of species is common; most of the species that have lived on the earth no longer exist. Ch How the rocks? Correlation with them has helped geologists date many New Zealand rocks, including those containing dinosaurs. Absolute age-dating 3. He was often presented with the problem of finding two different rock outcrops from two different periods. Although most attention in today's world focuses on dinosaurs and why they became extinct, the world of paleontology includes many other interesting organisms which tell us about Earth's past history.
Already registered? Would you like to take a short survey? Earn certificates of completion. We also want our index fossils to be common, widely-distributed species that are easy for scientists to identify. I would affect me? We use index fossils to identify periods of geologic history and to match up pieces of rock strata that have been separated by large distances.
Earth History. For a fossil to be a good index fossil, it needs to have lived during one specific time period, be easy to identify and have been abundant and found in many places. We don't want to use fossils belonging to species that lived for too long; these fossils would show up in more than one rock layer. The study of fossils and the exploration of what they tell scientists about past climates and environments on Earth can be an interesting study for students of all ages.
Earth Science: Tutoring Solution. Movements within the creation. Time factors of millions and billions of years is difficult even for adults to comprehend.