These prehistoric wasp cocoons, known as trace fossils among paleontologists, date back 75 million years to what is now Montana.
这些史前黄蜂蜂巢——古生物学家称为遗迹化石——可以追溯到7500万年前的蒙大拿州。
Trace fossils from the Middle Ordovician Lashizhong Formation in Zhuozishan, the northwest margin of Ordos Basin are studied systematically.
首次对鄂尔多斯盆地西北缘桌子山地区中奥陶世拉什仲组的遗迹化石进行了系统研究。
The Precambrian trace fossils described in this paper were found in the Yunmengshan and Beidajian Formation of the Ruyang Group of Lushan and Ruyang, western Henan province.
等发现于河南西部鲁山县和汝阳县的汝阳群云梦山组和北大尖组。
There exist some problems in the research on trace fossils at present, i. e. , the concept being not unitary, content being diverse, and classified naming not coinciding with the real fossils.
目前在遗迹化石研究中存在概念不统一，内容繁杂，分类命名与实体化石混淆不分问题。
The fossil dinosaur eggs included 19 species assinged to 10 genera belonged 7 families. They are assosiated with Hadrosaurs, Tyrannosaurs, Sauropods, Charophytes, Sporopollen and trace fossils et al.
据初步统计，已有7科、10属、19种之多，且与霸王龙、鸭咀龙、蜥脚类及轮藻、孢粉、痕迹化石等共生。
Other bird "trace" fossils have been found in Utah and Alaska, but none from so far back as the early Cretaceous -- at the height of the age of dinosaurs.
在犹他州和阿拉斯加州还发现了另一种鸟的“足迹”化石，但都无法追溯到白垩纪早期——恐龙时代的鼎盛时期。
In this study, 1003 core samples were collected, found 557 fossils of ostracods, identified the 15 fossil assemblage, the measured carbon and oxygen isotopes 252, and 189 trace element ratio data.
本研究共采集岩心样品1003个，发现介形类化石557个，鉴定出15个化石组合带，测得252组碳氧同位素和189组微量元素比值数据。
Recently unearthed fossils trace whales to a doglike predecessor of hoofed plant-eaters, and genetic analysis has identified hippos as whales' closest living relatives.
最近出土的化石使鲸的祖先可追溯到一种有蹄外形像狗的植食动物，而且基因分析证实了现存动物中河马是鲸的近亲。
Recently unearthed fossils trace whales to a doglike predecessor of hoofed plant-eaters, and genetic analysis has identified hippos as whales' closest living relatives.
最近出土的化石使鲸的祖先可追溯到一种有蹄外形像狗的植食动物，而且基因分析证实了现存动物中河马是鲸的近亲。
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