The microorganisms had lain dormant since the Eocene epoch, a time when Australia split off from Antarctica and modern mammals first appeared.
英
美
- 自始新世(5300-3650万年前)开始,它们便沉睡在化石之中,在那个时代,澳洲板块刚刚与南极板块分离,而现代哺乳动物刚刚开始出现。