The whiter ones are more rich in calcium carbonate which is indicative of forams.

白色的部分富含更多的碳酸钙，说明这里有孔虫。

Also known as forams, these are tiny protozoans that build shells of calcium carbonate.

也称为有孔虫，这些是微小的原生动物 ，可以形成碳酸钙的外壳。

During the PETM, between 30 and 50 percent of all foram species went extinct.

在 PETM 期间，30% 到 50% 的所有有孔虫物种灭绝了。

But for corals, forams, and other marine life, such extreme heat spelled disaster.

但对于珊瑚、有孔虫和其他海洋生物来说， 如此极端的高温意味着灾难。

And as for Gerta Keller's forams, Smit was in no doubt she had made another big mistake.

至于Gerta Keller发现的有孔虫，Smit全然相信她又犯了另一个大错误。

Though they don’t have eyes or brains or limbs, forams somehow manage to pull ingredients from seawater and stack them together into houses made out of the mineral calcium carbonate.

尽管它们没有眼睛、大脑或四肢， 但有孔虫以某种方式设法从海水中提取成分，并将它们堆放在一起， 形成由矿物碳酸钙制成的房屋。