A surface of discontinuity representing a break in the depositional record; a discontinuity representing erosion or nondeposition is a(n) ____________________.
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Q21: A sedimentary rock that shows evidence of
Q22: Long-lived radioactive isotope pairs used in radiometric
Q29: The time necessary for half of the
Q42: An interval of geologic time not represented
Q45: _ dating is used to obtain absolute
Q46: In order to correlate age-equivalent rock units
Q47: Carbon 14 is useful for archeological purposes
Q50: After one half-life, _% of the radioactive
Q52: Carbon-14 dating is based on the ratio
Q55: The principle of _ states that rock
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