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. Which fossil below can best be used to determine the relative
ages of the rocks in the columns?
---------- [Answer] ----------
Slichter