A geologist finds identical index fossils in a rock layer in the Grand Canyon in Arizona and in a rock layer in northern Utah, more than 675 kilometers away. What inference can she make about the 2 rock layers? (1 point)
She can make no inference.
The rock layer in the Grand Canyon is older.
A two rock layers are about the same age.
The rock layer in northern Utah is older.
1 answer
The correct answer is: The two rock layers are about the same age.