These prehistoric wasp cocoons, known as tracefossils 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。
2
Tracefossils 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。
3
The Precambrian tracefossils described in this paper were found in the Yunmengshan and Beidajian Formation of the Ruyang Group of Lushan and Ruyang, western Henan province.