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And scientists realised there was a barrier that was beginning to form at exactly the right time,
科學(xué)家們意識(shí)到那道屏障正好也在當(dāng)時(shí)開(kāi)始形成
something else that was created as the super-continent split apart: the Atlantic Ocean.
超大陸的分裂還創(chuàng)造了別的東西：大西洋
In the mid-Jurassic the new ocean flooded in,
中侏羅世誕生了一片新的大洋
cutting present day North America off from South America.
隔開(kāi)了今天的北美洲和南美洲
Because of the oceans, animals would have been isolated on the newly formed continents
因?yàn)橛辛撕Ｑ螅瑒?dòng)物被隔離在新生大陸上
allowing them to evolve separately and creating many new types of dinosaur.
使得它們獨(dú)自進(jìn)化成許多種新的恐龍
It's a process scientists call vicariance, but vicariance is very difficult to prove.
科學(xué)家們稱這一過(guò)程為地理分隔，但是地理分隔很難得到證明
Up until now it's been very difficult to demonstrate the connection between vicariance and dinosaur diversity in the middle Jurassic.
直到現(xiàn)在我們都很難證明地理分隔和中侏羅世恐龍多樣性之間的聯(lián)系
We have lacked any site that has sufficient high resolution to show us any connection between these processes.
我們還沒(méi)能找到一個(gè)地方能充分說(shuō)明這些過(guò)程之間的關(guān)系
But that was before Argentina.
但這只是在阿根廷這次發(fā)現(xiàn)之前
The first clues about vicariance came from something surprising,
第一條地理分隔的線索來(lái)自一個(gè)令人吃驚的發(fā)現(xiàn)
a discovery that seemed to have nothing to do with dinosaurs.
這一發(fā)現(xiàn)似乎與恐龍沒(méi)有任何關(guān)系。
