Radiocarbon dating of fossils taken from caves on islands along southeastern Alaska's coast suggest that at least a portion of the area was remaining ice-free during the last ice age.
从阿拉斯加东南海岸岛屿的洞穴中提取的化石的放射性碳年代测定法表明，在最后一个冰河时代，该地区至少有一部分保持无冰状态。
There are two key fossils called Proganochelys quenstedti and Palaeochersis talampayensis dating from early dinosaur times, which appear to be close to the ancestry of all modem turtles and tortoises.
原颚龟化石（Proganochelys quenstedti）和古老陆地龟化石（Palaeochersis talampayensis）这两种重要化石最早可以追溯到恐龙时代，它们与所有现代海龟和乌龟的祖先最为接近。
He starts at their beginning with a weighty introduction that looks at fossils dating back to the dinosaurs, the structure of feathers and the evolution of birds.
通过大量介绍恐龙时代的化石，他开始描述最初的羽毛结构和鸟类进化的开端。
The three-hour guided visits are a walk through time, along a well-designed nature trail past a wealth of exposed fossils dating as far back as the Tertiary, some 40 million years ago.
这三个小时的参观是一次时间漫游，沿精心设计的自然路径以此经过大量的可以追溯到大约4千万年前的第三纪的暴露的化石。
That fall into the cave happened 1.977 million years ago, according to dating based on the rate of decay of uranium in the rock layer that holds the fossils.
根据保存这些化石的岩石层里铀衰变率的基础上所确定的年代，那次掉入洞穴事件发生在197.7万年前。
This paper reports the U-series dating results of calcites and mammalian fossils from Southern Branch Cave of Maba hominid site.
报道马坝人地点南支洞次生碳酸盐岩和骨化石样的铀系年代。
The fossils in two ancient ape relict sites (8603, 8704) of Yuanmou have been determined by the ESR dating method.
采用电子自旋共振（ESR）测年法，对元谋县竹棚豹子洞箐（86 0 3）和小河蝴蝶梁子（870 4 ）两个古猿遗址的化石进行了测定。
The fossils in two ancient ape relict sites (8603, 8704) of Yuanmou have been determined by the ESR dating method.
采用电子自旋共振（ESR）测年法，对元谋县竹棚豹子洞箐（86 0 3）和小河蝴蝶梁子（870 4 ）两个古猿遗址的化石进行了测定。
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