Which is not a true statement?
A) Volcanic ash can form a depositional layer and can be used to date rocks because the ash deposit is the same age everywhere it got deposited
B) An iridium-rich clay layer from the debris of a giant meteorite impact can be used to date rocks because its presence in rock layers of the same age should be present
C) Individual sedimentary layers of similar composition can be used to date rocks because that rock type would have been deposited at the same geologic time
D) The presence of a single type of index fossil is sufficient to establish the relative age of a rock

Question

Quizplus · Accepted Answer

Sedimentary layers of similar composition cannot always be used to date rocks accurately because similar rock types can be deposited at different times under similar conditions. The principle of using specific characteristics like volcanic ash layers, iridium-rich layers, or index fossils is more reliable for dating because these are unique events or life forms that existed during specific time periods.

Which Is Not a True Statement