Earth's geography changed dramatically between the beginning and the end of the Tertiary. I could give you a long winded description, but I think you would prefer maps. Under "Related Links" there will be a map for the early Tertiary (called the Paleogene), and one for the later Tertiary (Neogene).
P.S. The Tertiary began 65.5 million years ago and ended 2.6 million years ago.
During the Tertiary period, the geography included the separation of continents, the uplift of the Himalayas and the Alps, and the formation of the Atlantic Ocean. Climate was generally warmer, with forests expanding and new plant and animal species evolving. The Tertiary period lasted from about 65 million years ago to 2.6 million years ago.
The K-T extinction occurred at the boundary between the Cretaceous and Paleogene periods, marking the end of the Mesozoic Era and the beginning of the Cenozoic Era. Therefore, it occurred at the end of the Cretaceous period and before the Tertiary period.
During the Tertiary period, a variety of rocks were formed, including sandstone, shale, limestone, and volcanic rocks such as basalt and andesite. The Tertiary period was characterized by changes in climate and tectonic activity, leading to the formation of diverse rock types in different environments.
Miocene
The Tertiary Period began roughly 65 million years ago following the mass extinction event that ended the Cretaceous Period. It ended about 2.6 million years ago, marking the beginning of the Quaternary Period.
warm and slightly clear
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 k-t extinction was ~65million years ago and marks the transition from the Cretaceous to the Tertiary period.
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the Apocalypse
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.
The K-T extinction occurred at the boundary between the Cretaceous and Paleogene periods, marking the end of the Mesozoic Era and the beginning of the Cenozoic Era. Therefore, it occurred at the end of the Cretaceous period and before the Tertiary period.
The Tertiary Period (including the Pliocene, Miocene, Oligocene, Eocene, and Paleocene Epochs) lasted from about 65 million years ago to 1.8 million years ago. It is part of the Cenozoic Era, along with the Quarternary Period.
The Holocene Epoch