查询词典 cretaceous

These stages can be generalized into four cycles: 1 lower Cretaceous to lower Eocene; 2 middle Eocene to Oligocene; 3 Oligocene to Neocene; 4 Quaternary.

从而可以划分出四个构造旋回：1早白垩世—早始新世；2中始新世—渐新世；3渐新世—晚第三纪；4第四纪。

Assuming a relatively constant rate of orchid evolution, the oldest common ancestor of the orchid family probably lived at least 76 million years ago, in the Late Cretaceous period.

假定兰花的进化过程一直保持一种相对稳定的水平，那么兰花家族最古老的共同祖先可能生活在距今至少7600万年前，即白垩纪晚期。

The Quantou Formation of Jilin Province, People's Republic of China, has recently yielded an important new fauna of 'middle' Cretaceous vertebrates. This fauna includes the small-bodied cerapodan ornithischian dinosaur Changchunsaurus parvus, represented by excellent cranial and postcranial material.

通过对长春龙头部特征的详细研究，对比目前所发现的其他基础角足龙类材料，重新分析了角足龙类的三个演化分支（鸟脚下目、肿头龙下目与角龙下目）之间的关系，为今后基础角足龙类的系统关系研究奠定了基础。

Another narrative weaves through Ellie's story on Secrets of Eromanga, that of the young, female Cretaceous ornithopod.

另一个故事藉由Ellie在Eromanga的秘密是由年轻人的叙述，一只母的白垩记的鸟脚龙。

A new ornithopod dinosaur, Lanzhousaurus magnidens gen. et sp. nov., from the Early Cretaceous of the Lanzhou Basin, Gansu Province, China, possesses the largest teeth of any herbivorous dinosaur yet discovered.

巨齿兰州龙是发现于中国甘肃省兰州盆地早白垩世地层中的一新鸟脚类恐龙，其牙齿是世界上已知植食性恐龙中最大的。

The transfer of these orogenesis types occurred respectively in the early-middle Triassic and late Cretaceous.

造山类型的两次重大转换分别发生于早、中三叠世与晚白垩世。

Recent discovery of abundant psittacosaur fossils from the Lower Cretaceous fossil beds in western Liaoning of China provides the material for detailed study of the osteology and paleobiology of psittacosaurs.

近年来在辽宁西部地区发现大量鹦鹉嘴龙化石，大大推进了该类恐龙的骨骼解剖学和古生物学研究。

New observations indicate that Jingangtai volcanic rocks unconformably overlie the early Cretaceous Shangcheng Pluton, hence they must have not formed in the Jurassic.

新的地质观察表明，其不整合于早白垩世商城岩体之上，不应当归属为侏罗纪。

It underwent the collision event of the Southern China plate with the North China plate at early Triassic, overthrust napping event of continental, and continental spread structure event beginning at Cretaceous. I...

它已经历三迭纪早期华南陆块与华北陆块的碰撞事件、大陆逆掩推覆构造事件及后期白垩纪早期开始的大陆伸展构造事件，是我国华南陆块与华北陆块之间的重要过渡单元。

The area reversed intensively in Late Cretaceous and Paleocene, so as to form a series of fault basins, which created a two-layer structure in the upper crust of the Lower Yangtze area.

这是造成下扬子地区海相古生一中生界油气地质勘探高复杂性、高难度性和高风险性的根本原因，也造就了下扬子区海相烃源岩的二次生烃和晚期成藏的优势。

It has been put forward that there exists single Ball point and double Ball points on the symmetrical connecting-rod curves of equilateral mechanisms.

从鲍尔点的形成原理出发，分析对称连杆曲线上鲍尔点的产生条件，提出等边机构的对称连杆曲线上有单鲍尔点和双鲍尔点。

The factory affiliated to the Group primarily manufactures multiple-purpose pincers, baking kits, knives, scissors, kitchenware, gardening tools and beauty care kits as well as other hardware tools, the annual production value of which reaches US$ 30 million dollars.

集团所属工厂主要生产多用钳、烤具、刀具、剪刀、厨具、花园工具、美容套等五金产品，年生产总值3000万美元，产品价廉物美、选料上乘、质量保证，深受国内外客户的青睐