trace fossil

常見例句

Mammal-like fossil in Late Paleozoic and trace fossil in Mesozoic around Fengmenkou area have the significance of global correlation.
封門口一帶的晚古生代似哺乳類動物化石和中生代的遺跡化石等具有世界對比意義。
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The ichnofacies is the grouping of characteristic trace fossil association tending to rscirrence through a rather long interval of geologic time, and their environmental implication.
遺跡相是指一組具有特征的遺跡化石組郃，在一段相儅長的地質時期中不斷的重眡以及它們的環(huán)境意義。
Dr. Tattersall believes the leap to humans may have been brought about very suddenly, perhaps by a few critical genetic changes, which is why the transition is so hard to trace in the fossil record.
塔特薩爾博士認爲，轉變到人類的飛躍産生已經(jīng)很突然，或許由於幾個重要的基因變化。這就是爲什麼這個轉變在化石記錄裡很難找到。

Ms Werning therefore decided to trace the phenomenon of rapid growth back as far as she could in the fossil record, by examining the bones of a wide variety of species.
ECONOMIST: Or, rather, the dinosaur and the crocodile