In order to assign absolute dates to fossils in this sediment core, it would be most helpful if
A) we knew the order in which the fossils occurred in the core.
B) the sediments had not been affected by underwater currents during their deposition.
C) volcanic ash layers were regularly interspersed between the sedimentary strata.
D) metamorphic rock strata alternated with sedimentary rock strata.
E) fossils throughout the column had equal ratios of a parental radioisotope to its daughter isotope.
Answer: C
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