Noun:

1. from 63 million to 2 million years ago

Adjective:

1. coming next after the second and just before the fourth in position

Tertiary period第三纪

thirdnum.第三；三分之一adj.第三的；三分之一的

3rdadj.第三的

1. The tertiary industry in our nation has grown rapidly in recent years.
   近几年我国的第三产业增长很快。
2. Tertiary education follows secondary education.
   高等教育紧跟中等教育。
3. Other tertiary institutions also offer degree courses in education.
   其他高等教育院校亦有开办教育学位课程。