Boundaries between intervals of the geological time scale are determined by
A)dividing the time range of the interval by the number desired subdivisions,thereby creating equal intervals between the divisions.
B)major events in the Earth's history,such as major extinctions.
C)using a quantile method whereby the number of years in each subdivision is determined by dividing the number of years by the desired number of classes.
D)climatic periods based on paleoclimatological reconstructions.
E)historical misunderstandings based on the principle of uniformitarianism;they remain as relicts of this bygone scientific period.

Question

Quizplus · Accepted Answer

Boundaries between intervals of the geological time scale are determined by major events in the Earth's history, such as major extinctions. For example, the boundary between the Cretaceous and Paleogene periods is defined by the extinction of the dinosaurs.

Boundaries Between Intervals of the Geological Time Scale Are Determined