Which statement best summarizes the development of the geologic time scale?
A) Numerical ages for rocks were known before the relative sequence of sedimentary layers was established.
B) Relative ages for sedimentary strata were known before accurate numerical dates for these rocks were measured.
C) Names of relative ages (such as Silurian)and accurate numerical dates for these ages became known at about the same time.
D) Numerical ages for fossils were known before the relative sequence of sedimentary layers was established.

Question

Quizplus · Accepted Answer

The development of the geologic time scale began with establishing the relative sequence of sedimentary layers. This allowed geologists to recognize and name different periods of time based on the types of fossils found in those layers. However, it wasn't until later that numerical dates for these periods were measured using radiometric dating techniques. Therefore, option B is the best statement to summarize this development.

Which Statement Best Summarizes the Development of the Geologic Time