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Relative and Absolute Dating Name ______________________ 1. Four outcrops and some fossils are shown below. Which fossil would be the best index fossil? a. b. c. 2. a. d. Which pie graph best represents the percentage of total time for the four major divisions of geologic time? b. c. d. Use the following information to answer the next three questions. The letters in circles represent fossils. 3. What is the oldest layer shown? a. glacial soil b. brown sandstone c. tan limestone d. grey limestone 4. When did fault XY in column 1 most likely occur? a. during the formation of the green shale b. before the grey limestone c. during the formation of the grey limestone d. during the formation of the black shale 5. Fossil A in the tan limestone is a fossil of the first known coral. The tan limestone was most likely deposited during which geologic time interval? a. Precambrian b. Paleozoic c. Pleistocene d. Quaternary 6. The diagram below shows a geologic cross section. Letters A through D represent different rock units. Contact metamorphism occurs when magma flows into or onto cooler rocks. The cool rock is metamorphosed by the extreme heat where the magma contacts it. The older rock is “baked”. Which sequence correctly shows the age of the lettered rock units, from oldest to youngest? a. A B C D b. C D A B c. D B A C d. D C B A Use the following information to answer the next two questions. Three stratigraphic columns are shown below. 7. The volcanic ash layer is considered a good time marker for correlating rocks because the volcanic ash layer a. has a dark color b. lacks fossils c. can be dated using carbon-14 d. was rapidly deposited over a wide area 8. The volcanic ash was dated using the concentrations of uranium-235 and lead-207 isotopes. It was found that 70% of the uranium remains. What is the approximate age of the ash?