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20 True/False questions

  1. ________ is an erosional contact between tilted, older strata below and horizontal, younger strata above.principle of faunal succession

          

  2. Assume that man's recorded history can be stretched back to 4600 years before the present. This is approximately what fraction of geologic time?Mesozoic

          

  3. Visualize five, horizontal, sedimentary strata exposed in a cliff or canyon wall identified by consecutive numbers, 1 being the lowest bed and 5 being the highest. Which of the following statements concerning the strata are true?beds l and 3 are older than bed 4

          

  4. Which of the following best characterizes an angular unconformity?Tilted strata lie below the unconformity; bedding in younger strata above is parallel to the unconformity.

          

  5. The radioactive isotopes uranium-238, uranium-235, and thorium-232 eventually decay to different, stable, daughter isotopes of ________.lead

          

  6. Who made the first clear statement of the law of superposition? When?Tilted strata lie below the unconformity; bedding in younger strata above is parallel to the unconformity.

          

  7. What fundamental concept states that in a horizontal sequence of conformable sedimentary strata, each higher bed is younger than the bed below it?Tilted strata lie below the unconformity; bedding in younger strata above is parallel to the unconformity.

          

  8. Sandstone strata and a mass of granite are observed to be in contact. Which of the following statements is correct geologically?one millionth

          

  9. An unconformity is a buried ________.Cenozoic

          

  10. Abundant fossil evidence did not appear in the geologic record until about ________.surface of erosion separating younger strata above from older strata below

          

  11. ________ era, literally the era of middle life, is often called the "Age of Reptiles."Cenozoic

          

  12. ___________ era could also be called the "Age of Flowering Plants." Flowering plants (angiosperms) strongly influenced the evolution of both birds and herbivorous mammals.Mesozoic

          

  13. Which of the following denotes the divisions of the geologic time scale in correct order of decreasing lengths of time beginning with the longest time interval and ending with the shortest?eon, era, period, epoch

          

  14. Which of the following is an essential characteristic of an index fossil?Tilted strata lie below the unconformity; bedding in younger strata above is parallel to the unconformity.

          

  15. What of the following refers to the investigative process by which geologists identify and match sedimentary strata and other rocks of the same ages in different areas?correlation

          

  16. The ________ is the idea or concept that ancient life forms succeeded each other in a definite, evolutionary pattern and that the contained assemblage of fossils can determine geologic ages of strata?An angular unconformity

          

  17. The half-life of carbon-14 is about 6000 years. Assume that a sample of charcoal is formed by burning of living wood 15,000 years ago. How much of the original carbon-14 would remain today?between one-fourth and one-eighth

          

  18. Mammals became the dominant land animals during the ________ era.surface of erosion separating younger strata above from older strata below

          

  19. Consider the names of the eras in the geologic time scale. What is meant by "zoic"?eon, era, period, epoch

          

  20. Which era is sometimes called the "age of dinosaurs"?Mesozoic