Evolutionary paleontologists use ‘index fossils’ to assign an age to a layer of sedimentary rock and its associated fossils. Your diagram should include sedimentary rock layers and fossils. 7. 10. Infer what you might learn from each type of fossil… Letters W, X, Y, and Z represent fossils found in the rock layers. Index fossils are used in the formal architecture of geologic time for defining the ages, epochs, periods, and eras of the geologic time scale. WHICH OF THE FOSSILS SHOWN IS AN INDEX FOSSIL? They advance understanding of the origin of life on Earth. Index fossils must have a short vertical range, wide geographic distribution and rapid evolutionary trends. 15.Identify the New York State index fossil group that includes fossil 4 shown on the rock sample. They aid in comparison of rock layers at distant locations. Which letter best represents an index fossil? Think Critically. Assume overturning has not occurred. Compare and contrast the frog fossil in Figure above and the fossil dinosaur tracks in Figure above. The second set of diagrams identifies four types of index fossils and shows four columns of fossil bearing rock strata. Some of the boundaries of these subdivisions are defined by mass extinction events, like the Permian-Triassic extinction. Which fossil could best be used as an index fossil? When choosing the right index fossil we can reinterpret the characteristics of index fossils to help us: 1. The surface bedrock at which location is most likely to contain this fossil? (1) A (3) C (2) B (4) D . Letters A, B, C, and D represent four different marine fossils found in these rock layers. exposures of layers that contain fossils. 6. (1) W (2) X (3) Y (4) Z Base your answers to questions 10 and 11 on the block diagram below, which shows bedrock units A through F and boundary XX’. The diagram below represents a geologic cross . answer choices section of a portion of Earth’s crust. 16.Based on the fossils present, the rock sample shown in the diagram came from which rock unit listed 2. They advance understanding of rock type at the time the organism lived. This video screencast was created with Doceri on an iPad. IN EACH OUTCROP ARE SEVERAL FOSSILS. Doceri is free in the iTunes app store. Evolutionary theory assumes that a particular creature evolved from its ancestors, lived successfully for a period, then became extinct as its descendants evolved better ways of surviving. The diagram below represents the placoderm fish Bothriolepis, an index fossil found in New York State. l. Reconstruct the complete sequence ofevents and draw the layers (with the fossils if present) on the appropriate column of your Report Sheet. FOR EXAMPLE: THE DIAGRAM BELOW SHOWS SEVERAL ROCK OUTCROPS SEPARATED BY LARGE DISTANCES. They aid in the study of ranges of different organisms. Learn more at http://www.doceri.com Index fossils (also known as guide fossils or indicator fossils) are fossils used to define and identify geologic periods (or faunal stages). Create an original diagram to explain the concept of index fossil. index fossils. How do index fossils help scientists?
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