One genetic study has traced its origins to the Late Cretaceous or Early Paleogene period.
一项遗传学研究将其起源追溯到白垩纪晚期或古近纪早期。
Paleogene Period
原声例句
PBS地球-动物趣闻
Journeys Through Geologic Time
This was the very beginning of the Paleogene Period, and the world was … kind of empty.
这是古近纪的 开端，世界… … 有点空虚。
中文百科
古近纪 Paleogene
（重定向自Paleogene Period）
古近纪（英语：Paleogene，符号E），旧称早第三纪，是地质时代中的一个纪，开始于同位素年龄65.5±0.3百万年（Ma），结束于23.03±0.05Ma。“古近纪”一名中的“古”是paleo-的意译，“近”则是-gene的音译，并兼顾了字面意义。古近纪包括古新世、始新世、渐新世。
英语百科
Paleogene 古近纪
（重定向自Paleogene Period）
The Paleogene (pronunciation: /ˈpæliːədʒiːn/ or /ˈpeɪliːədʒiːn/; also spelled Palaeogene or Palæogene; informally Lower Tertiary) is a geologic period and system that began 66 and ended 23.03 million years ago and comprises the first part of the Cenozoic Era. Lasting 43 million years, the Paleogene is most notable as being the time in which mammals evolved from relatively small, simple forms into a large group of diverse animals in the wake of the Cretaceous–Paleogene extinction event that ended the preceding Cretaceous Period.
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