conodont造句
1. Apart from conodonts, unequivocal evidence for fish does not occur until the Ordovician.
2. The discovery of this conodont-bearing animal suggests that at least some conodonts may be among the most primitive of vertebrates.
3. But in the conodonts examined so far the crystalline structure within this layer is very variable.
4. In the 1980s, however, paleontologists found full fossilized conodont specimens, and only recently have scientists begun to unravel their secrets.
5. The soft anatomy of conodont shows some soft tissues including eyes, notochord, nerve cord, myomeres and caudal fin.
6. According to conodont , coral and foraminifera fossils discovered, the geological age of this sequence of sedimentary strata is Early Carboniferous.
7. Three failing periods of conodont are influenced by two ice ages, five sea-level changes and rainfalls in the geological history time.
8. We also concisely described the characteristics of the conodont fauna through the boundary strata.
9. In Tazhong-88 Well, the conodont fossils in the late of Middle Ordovician and the early of Late Ordovician slope facies have been found for the first time.
10. Study is made on palaeozoic conodont fossil from Bachu Uplift and Awati Depression. 5 conodont fossil assemblage zones are identified. And their geological history and geological eras are discussed.
11. According to the conodont and fusulinid fossils, their ages are determined to be Devonian -Permian.
12. Conodont is an important kind of fossil in the stratigraphy research.
13. Based on an analysis of the conodont biofacies, it is inferred that there was probably a deep-sea basin facies sedimentary environment in the Wenguer area during the early Middle Permian.
14. Three prosperous periods of conodont have relation to Palaeomagnetism Reversal.
15. Furthermore, there appears to be a total absence of dentine, which is unexpected if conodonts are vertebrates.
16. The content of this text is studying evolutive degree of the source rock of the upper Sinian and the Paleozoic group mainly by vitrinite, pyrogenation, conodont and sporopollen.
17. A detailed research has been worked on the Late Upper Permian conodont fauna of Tieshikou section in Xinfeng area, Jiangxi Province.
18. MEI Shi - long , 1991 . Middle and Late Cambrian conodont and trilobite biostratigraphy in Wanxian, Hebei . Unpublished Ph. D thesis of Peking University.
19. By systematic study on some categories of biotic fossils discovered in the carboniferous strata of Laiwu coal field, the assemblage of Fusulinida and conodont of this area is established.
20. Main production suitable for all kinds of electric bicycle, tricycles, use of lead-acid battery, its products conodont and midfielder two brands.
21. Based on palaeomagnetic data and tectonic analysis, the present authors concluded that this conodont fauna were from Permian Northern Temperate Zones.
22. Forty eight characteristic species belonging to 27 genera are described herein, and 4 new conodont species are established.