白垩纪时期 meaning in English
cretaceous period million years ago
Examples
- This clam fossil is from the cretaceous period , approximately 100 million years ago
这个蛤化石来自大约一亿年以前的白垩纪时期 - The prints are believed to have been made during the cretaceous period of the mesozoic era , kim said in a statement
这些足迹被认为是在中生代白垩纪时期由当时鸟类留下的。 - In addition , the mafic dykes of hainan island were formed in an intraplate extensional environment , similar to the mafic dykes in north guangdong and fujian coastal areas , all suggesting an extension regime tectonic in southeastern china during cretaceous
白垩纪基性岩脉( 81 135ma )形成于板内拉张环境，与粤北、福建沿海地区的白垩纪基性岩脉共同指示了中国东南部白垩纪时期处于拉张的构造环境。 - Under the guide of dynamic system for pool - forming and petroleum system , this research has fully taken advantage of every kinds of data from the area , applied the new idea , new technology , new methods to study tectonic , sedimentary and resource rock . the results suggest that the source rock of permo - carboniferous has undergone three evolution periods . the first gas generation occurs at the end of triassic and the generation stopped during jurassic - cretaceous
该文以成藏动力学系统和含油气系统理论为指导，充分利用工区以及邻区的各种资料，运用新思路、新技术、新方法，在构造、沉积、烃源岩评价等基础地质研究的基础上，认为石炭?二叠系烃源岩经历了三叠纪末期以前的一次生气阶段、侏罗纪?白垩纪时期的演化停止阶段和早第三纪至今的二次生气阶段等三个阶段。