Which period makes up nearly all of the Cenozoic era?

Question

Silurian

Tertiary

Quaternary

Ordovician

Answer 1

The period that makes up nearly all of the Cenozoic era is the Tertiary. However, it's important to note that the Tertiary period has been largely subdivided into the Paleogene and Neogene periods in modern geological timescales. The Cenozoic era is also divided into the Tertiary (Paleogene and Neogene) and Quaternary periods, with the Quaternary making up the most recent part.