precambrian造句
1. Hoffman possesses an encyclopedic knowledge of Precambrian continental geology.
2. Rapakivi is a special rock in Precambrian.
3. Precambrian time accounts for as much as eighty - five percent of all geological time.
4. The existence of the undeformed and unmetamorphed Precambrian dike swarms shows that the Precambrian North China Craton had been a rigid plate.
5. Early - Precambrian rocks are widely exposed in Dunhuang - Beishan area, GansuProvince.
6. Late Precambrian mafic dyke swarms are extensively developed in the central North China Craton.
7. Precambrian high grade terrene(granulite facies terrene), consisting of all continental shields (basements) in the world, are the representatives of lower crust.
8. Among them the Precambrian and Cenozoic eras are the main metallogenic epoches in the world.
9. The early Precambrian in Jilin province includes the Archaeozoic granite-greenstone belt, early Proterozoic Ji'an Group and mid Proterozoic Laoling Group .
10. Many fold systems constituted by the Precambrian Paleozoic platform structural layer and the endogenetic gold deposits controlled by those fold systems are formed in the Meso Cenozoic eras.
11. There are seven ductile shear zones developed in Precambrian metamorphic rock in southwest Zhejiang. They mainly extend from NE or NNE to SW or SSW and are developed in Badu group and Longquan group.
12. Worsley and his colleagues have extrapolated these effects of the Supercontinental Cycle back into the Precambrian.
13. Extensive areas within continental platforms are formed of basement, a complex of metamorphic and igneous rocks of Palaeozic or Precambrian age.
14. Prior to this lies the yawning stretch of epochs known as the Precambrian.
15. Despite the obscuring veil of time, many researchers can make out the traces of the Supercontinent Cycle in the Precambrian.
16. The project will adopt a case-study methodology and will focus on scientific studies of the Precambrian.
17. That history began with the origin of the primitive, unicellular aquatic algae of the Precambrian Eon.
18. Of , belonging to, or designating the earlier of two divisions of the Precambrian era.
19. They are controlled by shear fracture belt of epimetamorphic rock series of Precambrian Period.
20. The oldest rocks in the concession area belong to the Guyana and are of Precambrian age.
21. The original bodies of gas-oil formation are Acritarch and Botryococcus from Precambrian to Silurian.
22. There have long been disputes about the time of origin of microbes that were quite prosperous in the Precambrian and the divergence time of metazoans .
23. There are two different ideas about the tectonic division of North China Block (NCB) basement and its evolution in early Precambrian.
24. The Late Pan-African age of metamorphism is important when considering the location of the Mashan Complex and Jiamusi Massif during the late Precambrian to early Phanerozoic .
25. Darwin argued that the question might be answered in future by the discovery of fossils in rocks that formed before the Cambrian period, in Precambrian times.
26. The lower Proterozoic Badu Group is one of the oldest metamorphic rock series in the continental margin of Southeast China, and is an integral part of the early Precambrian Zhejiang-Fujian craton.
27. The Mashan group and Heilongjiang group are major components of the base of Precambrian Jiamusi block.
28. Gneiss, a metamorphic rock, can be commonly found in Precambrian areas.
29. In the world a lot of gold deposits occur in the early Precambrian greenstone belts.
30. They are in fact metamorphosed rocks , predominantly schist , amphibolites, granites and sand stones and Muruwa Precambrian.
12