When geologists refer to the "Big Five," what are they referring to?

When geologists refer to the Big Five, they are referring to the five different events of extinction in history. Cretaceous-Paleogene, Triassic-Jurassic, Permian-Triassic, Late Devonian and Ordovician-Silurian.

Answer Link

AlphaFlight AlphaFlight · Answer 2 · 2019-05-30T22:17:23+02:00

Answer:

The five largest mass extinctions in Earth's history.

Explanation:

The Big Five is the term used for the 5 mass extinctions that took place during the course of Earth's history.

These big five mass extinctions were :

End-Ordovician
Late Devonian
End-Permian
End-Triassic
End-Cretaceous

These extinctions are really significant because they impacted the population of organisms found in those specific times drastically and also led to the evolution of new species.