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  1. daughter isotope
  2. isotopic dating
  3. radioactive decay
  4. geologic time
  5. fossil succession
  6. stratigraphic formation
  7. numerical age
  8. half-life
  9. relative age
  10. uniformitarianism
  11. Precambrian
  12. correlation
  13. geologic time scale
  14. Epoch
  15. superposition
  16. stratigraphic column
  17. era
  18. Cambrian explosion
  19. original horizontality
  20. period
  21. unconformity
  22. eon
  23. geologic column
  24. cross-cutting relations
  25. carbon-14 (14C) dating
  26. isotope
  27. contact
  28. geologic map
  29. parent isotope
  1. a A radiometric dating process that can tell us the age of organic material containing carbon originally extracted from the atmosphere.
  2. b The remarkable diversification of life, indicated by the fossil record, that occurred at the beginning of the Cambrian Period.
  3. c The process of defining the age relations between the strata at one locality and the strata at another.
  4. d An interval of geologic time representing the largest subdivision of the Phanerozoic Eon.
  5. e The decay product of radioactive decay.
  6. f The science of dating geologic events in years by measuring the ratio of parent radioactive atoms to daughter product atoms.
  7. g An interval of geologic time representing the largest subdivision of a period.
  8. h The principle that sediments are deposited in nearly horizontal layers.
  9. i A scale that describes the intervals of geologic time.
  10. j The largest subdivision of geologic time.
  11. k The age of one geologic feature with respect to another.
  12. l A 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.
  13. m A radioactive isotope that undergoes decay.
  14. n The process by which a radioactive atom undergoes fission or releases particles thereby transforming into a new element.
  15. o Different versions of a given element that have the same atomic number but different atomic weights.
  16. p The age of a rock or structure as specified in years; referred to as Òabsolute ageÓ in older literature.
  17. q The principle that the same physical processes observed today are responsible for the formation of ancient geologic features.
  18. r The interval of geologic time between Earth's formation about 4.57 Ga and the beginning of the Phanerozoic Eon 542 Ma.
  19. s The span of time since the formation of the Earth.
  20. t The principle that younger layers of sediment are deposited on older layers of sediment; thus, in a sequence of strata, the oldest layer is at the base.
  21. u The 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.
  22. v An interval of geologic time representing a subdivision of a geologic era.
  23. w A cross-section diagram of a sequence of strata summarizing information about the sequence.
  24. x A boundary between two different rock sequences representing an interval of time during which new strata were not deposited and/or were eroded.
  25. y A composite stratigraphic chart that represents the entirety of the Earth's history.
  26. z A map showing the distribution of rock units and structures across a region.
  27. aa The time it takes for half of a group of a radioactive element's isotopes to decay.
  28. ab The 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).
  29. ac A means of determining the relative age of rock by looking at which rock or structure cuts another; the feature that has been cut is older.