The sediments are rich in clay, which forms when water weathers rocks into fine-grained particles.

这些沉积物富含粘土，粘土是由水流将岩石侵蚀成细小的微粒所形成的。

youdao

Then something strange happened: the loess in the terraces wasn't on top of crushed rock anymore - it was on top of very finely laminated clay-rich sediments.

然后一些很奇怪的事儿发生了：梯田里的黄土不再在碎岩石上-在非常完美层压的黏土丰富的沉积物上。

youdao

Elements are mainly terrigenous, clay (or fine muddy matter) is the major factor controlling the concentrations of heavy metals in sediments.

大多数元素以陆源为主，粘土(或细颗粒沉积物)是控制底质金属含量的主要因素。

youdao

Such helium was found inside fullerenes in well-studied, clay sediments that contain extraterrestrial iridium and highly shocked minerals resulting from an asteroid impact 65 million years ago.

BBC: ET gases caged on Earth