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From the illustration, it can be said that the age of the rock layer is the same in the four locations of index fossil 1.
It is a measure of how long a material has been fossilized.
Thus, if a rock layer contains a fossil and another similar rock layer does not have the fossil, one can conclude that the ages of the rock layers are different.
Only index fossil 1 is found in all the four locations as shown in the image. Hence, one can as well infer that the rock layers in all these four locations are of the same age.
More on age of fossils can be found here:https://brainly.com/question/2495177
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