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Geologic Time Break: Understanding Unconformities and Dating Methods

Explore the concept of unconformities in geologic time, learn about radiometric dating techniques, and discover the principles of stratigraphy and relative dating. Uncover the secrets hidden in stratified rock layers and the clues they offer about Earth's history.

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Geologic Time Break: Understanding Unconformities and Dating Methods

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  1. Ch 8 Review Jeopardy

  2. Break in geologic time Answer

  3. Unconformity Home

  4. Stratified rock over unstratified rock Answer

  5. Nonconformity Home

  6. Layer of sedimentary rock over an older, eroded layer of rock Answer

  7. Disconformity Home

  8. True or False: Unconformities determine absolute age Answer

  9. false Home

  10. Which law tells us that all rocks beneath an unconformity are older than rocks above the unconformity? Answer

  11. Law of Superposition Home

  12. In radiometric dating, what is the original material called? (the radioactive material) Answer

  13. Parent isotope Home

  14. What do we use to date fossils younger than 70,000 years? Answer

  15. Carbon-14 dating Home

  16. In radiometric dating, scientists compare the proportion of a radioactive parent isotope to a stable: ___________ Answer

  17. Daughter isotope Home

  18. Method of determining the absolute age of an object by comparing the relative percentages of a radioactive and stable isotope Answer

  19. Radiometric dating Home

  20. Radioactive decay happens at a relatively ____________ rate. Answer

  21. Constant . Home

  22. States that sedimentary rocks left undisturbed will remain in horizontal layers Answer

  23. Principle of horizontality Home

  24. Which law tells us that a fault or igneous intrusion is always younger than the rock layers it cuts through? Answer

  25. The Law of Crosscutting Relationships Home

  26. States that undisturbed sedimentary rock layer is older than the layer above it and is younger than the layers below it Answer

  27. Law of Superpostion Home

  28. Principle that geologic processes that occurred in the past can be explained by current geologic processes Answer

  29. Uniformitariansim Home

  30. Assuming a fault is younger than 2 layers its cutting through is explained by this law Answer

  31. Crosscutting Relationships Home

  32. The numeric age of an object is called: ______ Answer

  33. Absolute age Home

  34. These layers are used to find absolute age and are often found in glacial lakes Answer

  35. Varves Home

  36. The age of an object in relation to ages of other objects Answer

  37. Relative Age Home

  38. Measuring the rate at which a stream erodes its bed estimates what kind of age? Answer

  39. Absolute Age Home

  40. Arrangement of layer in which coarse and heavy particles are located in the bottom layers Answer

  41. Graded Bedding Home

  42. True or False: bacteria can not survive freezing temperatures Answer

  43. True! Home

  44. Almost all fossils are discovered in what kind of rock? Answer

  45. Sedimentary Home

  46. Fossilized dung or waste Answer

  47. Coprolite Home

  48. Fossilized evidence of past animal movement such as tracks and foot prints Answer

  49. Trace Fossil Home

  50. Fossil used to date rock layers of a particular geologic age Answer

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