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Base your answers to questions 51 through 54 on the cross section below and on your knowledge of Earth
science. On the cross section, numbers 1 through 7 represent rock units in which overturning has not occurred.
Line XY represents a fault and line WZ represents the location of an unconformity

The three index fossils below are found within rock units 1, 2, and 3. Since the rock units were deposited during different geologic time periods, each fossil is found in a different rock unit.

Base your answers to questions 51 through 54 on the cross section below and on your knowledge of Earth science On the cross section numbers 1 through 7 represen class=

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Looking at the cross section photograph you posted, you can see where the three index fossils are found in units 1, 2, and 3. I did notice that you left off the main question that is needed to complete the answer needed. The rest of the questions wants you to write the name of the index fossil next to the rock unit where the fossil is most likely found. I will list this below. 

Rock unit 1 - Centrceras
Rock unit 2 - Hexameroceras
Rock unit 3 - Cryptolithus