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18 Matching questions

  1. Assume that man's recorded history can be stretched back to 4600 years before the present. This is approximately what fraction of geologic time?
  2. 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?
  3. The radioactive isotopes uranium-238, uranium-235, and thorium-232 eventually decay to different, stable, daughter isotopes of ________.
  4. Consider the names of the eras in the geologic time scale. What is meant by "zoic"?
  5. ________ is an erosional contact between tilted, older strata below and horizontal, younger strata above.
  6. Sandstone strata and a mass of granite are observed to be in contact. Which of the following statements is correct geologically?
  7. Who made the first clear statement of the law of superposition? When?
  8. 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?
  9. What fundamental concept states that in a horizontal sequence of conformable sedimentary strata, each higher bed is younger than the bed below it?
  10. An unconformity is a buried ________.
  11. 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?
  12. Mammals became the dominant land animals during the ________ era.
  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?
  14. Which of the following best characterizes an angular unconformity?
  15. Which of the following is an essential characteristic of an index fossil?
  16. ________ era, literally the era of middle life, is often called the "Age of Reptiles."
  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?
  18. Abundant fossil evidence did not appear in the geologic record until about ________.
  1. a between one-fourth and one-eighth
  2. b life; living things
  3. c Mesozoic
  4. d law of superposition
  5. e eon, era, period, epoch
  6. f principle of faunal succession
  7. g correlation
  8. h Cenozoic
  9. i beds l and 3 are older than bed 4
  10. j lead
  11. k Tilted strata lie below the unconformity; bedding in younger strata above is parallel to the unconformity.
  12. l The granite is older if the sandstone contains pebbles of the granite.
  13. m The organism only lived for a short period of geologic time.
  14. n surface of erosion separating younger strata above from older strata below
  15. o Nicolaus Steno, 17th century
  16. p An angular unconformity
  17. q 550 million years ago
  18. r one millionth