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Dating Fossils and Rock Layers
Grade Level
AP Biology
APB.378 Dating Fossils and Rock Layers
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A fossil is located above a dated lava flow, below a dated ash bed, and within a layer containing an index fossil. Which strategy best combines the evidence?
A
Ignore the radiometric dates because index fossils are always exact.
B
Average all dates and ranges into one exact fossil age.
C
Use only the fossil's position in the layer and reject all numerical evidence.
D
Use the lava and ash to bracket the age, then check whether the index fossil's known range narrows the interval.
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