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All mammals present today are example of tertiary period mammals as we are living in tertiary period .
The "tertiary period" is not a place you can go to. It is a time period - in the remote past of Earth. Since it is in the past, you can't go there.
The Tertiary Period (65.5 to 2.588Ma) is the informal name for the geological period that followed the K-T extinction event. So the K-T event happened before the Tertiary. In fact "K-T" is actually short for Cretaceous-Tertiary as it marked the end of the Cretaceous and the start of the Tertiary.The lower tertiary is more formally known as the Paleogene Period(65.5 - 23.03 Ma) and the upper Tertiary is more formally known as the Neogene Period(23.03 - 2.588Ma).
The k-t extinction was ~65million years ago and marks the transition from the Cretaceous to the Tertiary period.
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the Apocalypse
Pliocene
During the Tertiary period, which lasted from about 66 million to 2.6 million years ago, the continents were already in positions similar to today but with some differences. For example, North America and Eurasia were connected via the Bering land bridge, and South America was still drifting towards its collision with North America. Antarctica was largely ice-free, while Australia was closer to Antarctica.
pleiocene
During the Tertiary Period, the surface of the earth looked much like it does today. It was quite warm with periods of cold much like today.