The diagram below represents 3 geologic columns found in widely
separtated outcrops of sedimentary rock. Each rock layer in the columns represents
a different geologic time interval, ranging from 1 (the oldest), 2, 3, to 4
(the youngest).
12. The fossil shown below that can best
be used to determine the relative ages of the rocks in the columns would be
fossil d, because it is found in all 3 geologic columns, and because it is found
in only one layer in each. Fossil B is also found in all 3 columns, but it is
found in several layers in each so would be less useful determining relative
ages of the layers.
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Slichter