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29 True/False questions

  1. EpochAn interval of geologic time representing the largest subdivision of a period.

          

  2. isotopic datingThe science of dating geologic events in years by measuring the ratio of parent radioactive atoms to daughter product atoms.

          

  3. geologic time scaleA scale that describes the intervals of geologic time.

          

  4. fossil successionThe principle that the assemblage of fossil species in a given sequence of sedimentary strata differs from that found in older sequences or in younger sequences; a given species appears at a certain level and then disappears (goes extinct) at a higher level.

          

  5. geologic mapA map showing the distribution of rock units and structures across a region.

          

  6. geologic columnA composite stratigraphic chart that represents the entirety of the Earth's history.

          

  7. numerical ageThe age of a rock or structure as specified in years; referred to as Òabsolute ageÓ in older literature.

          

  8. geologic timeA map showing the distribution of rock units and structures across a region.

          

  9. correlationThe boundary surface between two rock bodies (as between two stratigraphic formations, between an igneous intrusion and adjacent rock, between two igneous rock bodies, or between rocks juxtaposed by a fault).

          

  10. stratigraphic columnA recognizable layer of a specific sedimentary rock type or set of rock types, deposited during a certain time interval, that can be traced over a broad region.

          

  11. cross-cutting relationsThe process of defining the age relations between the strata at one locality and the strata at another.

          

  12. daughter isotopeThe decay product of radioactive decay.

          

  13. eraThe largest subdivision of geologic time.

          

  14. isotopeThe boundary surface between two rock bodies (as between two stratigraphic formations, between an igneous intrusion and adjacent rock, between two igneous rock bodies, or between rocks juxtaposed by a fault).

          

  15. PrecambrianAn interval of geologic time representing a subdivision of a geologic era.

          

  16. periodAn interval of geologic time representing a subdivision of a geologic era.

          

  17. uniformitarianismA boundary between two different rock sequences representing an interval of time during which new strata were not deposited and/or were eroded.

          

  18. stratigraphic formationA cross-section diagram of a sequence of strata summarizing information about the sequence.

          

  19. carbon-14 (14C) datingA radiometric dating process that can tell us the age of organic material containing carbon originally extracted from the atmosphere.

          

  20. superpositionAn interval of geologic time representing a subdivision of a geologic era.

          

  21. half-lifeThe time it takes for half of a group of a radioactive element's isotopes to decay.

          

  22. original horizontalityThe principle that sediments are deposited in nearly horizontal layers.

          

  23. relative ageThe age of a rock or structure as specified in years; referred to as Òabsolute ageÓ in older literature.

          

  24. eonAn interval of geologic time representing the largest subdivision of the Phanerozoic Eon.

          

  25. unconformityA boundary between two different rock sequences representing an interval of time during which new strata were not deposited and/or were eroded.

          

  26. radioactive decayThe age of one geologic feature with respect to another.

          

  27. Cambrian explosionThe process of defining the age relations between the strata at one locality and the strata at another.

          

  28. contactThe largest subdivision of geologic time.

          

  29. parent isotopeA radioactive isotope that undergoes decay.