Open Socrative. Type the room number: 246449

Enter your name. Write answers to the questions on the board.

• Open Socrative. Type the room number: • Enter your name. Write answers to the questions

on the board.

1.State one piece of evidence that indicates basalt is the youngest rock unit in the cross section.

2. You MUST use your?

3. State one reason why certain species of graptolites are used as an index fossil.

4. The index fossil Eurypterus is found in the limestone layer. What trilobite index fossil could be found in the shale layer?

5. The granite intrusion is 54 million years old and the vesicular basalt is 1.2 million years old. The rock layers have not been overturned. During which geologic time period did the shale layer form?

6. Order from Oldest to Youngest:

d

d

d

d

B

C

D

E

A

7. State one piece of evidence that supports the fact that the Palisade Sill is younger than the Brunswick sandstone.

8. Identify the geologic feature represented by boundary X. Identify by name one index fossil that existed when the limestone rock shown in the cross section was being formed

9.During which geologic time period was rock layer C deposited? 10. Identify two processes that produced the unconformity in outcrop I.

11.Describe one characteristic a fossil must have in order to be considered a good index fossil. 12.Explain why carbon-14 can not be used to find the geologic age of these index fossils.

13.The index fossil Dicellograptus was found in the shale layer. During which geologic time period did this shale layer form?

14.What geologic time period is missing?

15.Which Graph is correct?

16. Which layer is the youngest? Oldest

17. Put in order: Oldest to Youngest A, B, C, D

18. Where did earth’s early oxygen come from?

19. Where did gases in earth’s early atmosphere come from?

20. Which letter best represents an index fossil?

21. Why is volcanic ash a good time marker?

22. When did a rock form that contains the index fossil Lichenaria ?

23. What group of organisms does Lichenaria belong to?

24. Are those organisms still alive today?

25. What index fossil lived during the breakup of pangaea?

26. When did the Archean Eon end?

27. List in order from oldest to youngest:Earliest birdsEarliest fishesEarliest insects

28. After two half-lives, what percent of the original sample of uranium-238 remains?

29. If 100 grams of pure C 14 starts to decay, how much N 14 will be created after 11,400 years?

30. How many ½ lives is that?

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