某些特殊分子可能成为潜在的标志化石。
Some particular genera and species can be consided as latent guide fossil.
因此，化石是识别地球历史上特定时期的标志。
Fossils are thus identifying markers for particular periods in Earth's history.
这也标志着人类向着实现化石燃料无碳发电迈出了一大步。
It's a major step forward in delivering the reality of carbon-free fossil fuel electricity generation.
从化石上腿痕迹的位置，腹部的曲线印记，且化石中缺少翅膀的标志，研究员猜测那些痕迹是古浮游笔直的竖起一对翅膀休息时留下的。
From the position of the legs, the curve of the abdomen, and the lack of wing marks, the researchers suspect that the imprint was made by an ancient mayfly that held its wings upright when at rest.
简要介绍了植物化石角质层生物标志化合物研究方法。
The method on biomarker study of fossil plant cuticles is briefly introduced.
古生物学家以黑硅石为化石采集地点的标志。
Paleontologists know chert as a good place to look for fossils.
而巴黎气候变化会谈传来的消息也表明，其最终协约标志着“化石燃料时代落幕的开始”。
And reports coming out of the Paris climate change talks suggested that last week's pact marked the "beginning of the end of fossil fuels."
生物标志物以分子化石的形式记录了沟鞭藻的起源及演化历史。
Biomarker, as molecular fossil, recorded the origin and evolutionary history of dinoflagellate.
研究小组发现了两块骨类化石上有切刮痕迹的，这些痕迹是肉类切割的标志。
The research team found two fossil bones with cut and scrape marks, signs of meat carving.
综述了当今人类社会严重的资源、能源与环境危机标志着后化石经济时代的来临；
The post-petroleum epoch is approaching as indicated by resources, energy and environmental crises.
其中之一便是一直杳无踪迹的来自白垩纪时期的保存良好的的羽毛化石。白垩纪处于一亿四千五百万年前到六千五百万年前之间，以恐龙的大规模灭绝为结束标志。
One such lacuna has been the absence of well-preserved feathers from the Cretaceous—the period between 145m and 65m years ago that ended with the mass extinction that wiped out the dinosaurs.
其中之一便是一直杳无踪迹的来自白垩纪时期的保存良好的的羽毛化石。白垩纪处于一亿四千五百万年前到六千五百万年前之间，以恐龙的大规模灭绝为结束标志。
One such lacuna has been the absence of well-preserved feathers from the Cretaceous—the period between 145m and 65m years ago that ended with the mass extinction that wiped out the dinosaurs.
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