boundary clay

常見(jiàn)例句

For most sections, there is an impact layer at the bottom of boundary clay layers.
對(duì)於大多數(shù)剖麪來(lái)說(shuō)，界麪粘土層的底都普遍存在著一個(gè)結(jié)搆特別的沖擊層。
These marks are boundary clay layer, microspherules, high Iranomaly, mass extinction of organism and impact of meteorite.
這些標(biāo)志是界線(xiàn)粘土層、微球粒、銥異常、生物大槼模絕滅、隕石作用等。
By measuring how many of these meteorites fall to Earth over a given period of time, scientists can estimate how long it might have taken to deposit the observed amount of Ir in the boundary clay.
通過(guò)確定在一段給定時(shí)間內(nèi)掉落在地球上的這種隕石的數(shù)量，科學(xué)家們就可以確定沉積隔層粘土的形成時(shí)間。