虽然在地质记录中有十几次甚至更多的大灭绝，但白垩纪的大灭绝总是引起古生物学家的兴趣，因为它标志着恐龙时代的结束。
While there are a dozen or more mass extinctions in the geological record, the Cretaceous mass extinction has always intrigued paleontologists because it marks the end of the age of the dinosaurs.
然后从沉积微相分析入手，研究了沉积相标志，包括地层岩石的颜色、沉积构造、粒度分布、古生物学等。
Then, beginning with the microfacies, signs of sediment facies, including rock's colour, sediment structure, granularity distribution, fossil and so on, are studied.
然后，结合传统的标志层法、煤岩学及古生物学方法，对该区主要煤层进行对比。
Later in the paper, a correlation between the main coal-seams in this province is made, in combination with the traditional method of the key bed, coal petrography and palaeontology.
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.
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.
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