calcareous microfossil造句

He was a pioneer in the use of mass spectrometry to determine changes in climate as recorded in the oxygen isotope composition of calcareous microfossils.
His research entitled Distribution of Calcareous Microfossils in the China Seas and its Paleenvironmental Significance won the first prize for the Advancement of Science and Technology awarded by the former State Education Commission and the fourth place for the National Natural Science Award.
It's difficult to find calcareous microfossil in a sentence. 用calcareous microfossil造句挺难的