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1. Indeed, by the late Silurian, colonization of the changing land with its newly emerging continents was well under way.

2. The grey slates and shales of the Silurian rock are obvious as you walk.

3. The age of Xia'ertai Group is Cambrian—Silurian period.

4. Representative elements of order Albaillellaria firstly appear in Silurian, which prosperous in Late Devonian, and extinction in end-Permian, is the characteristic group of Late Paleozoic Radiolaria.

5. Straddling the late Ordovician period and the early Silurian period, the Andean-Saharan ice age was marked by a mass extinction, the second most severe in Earth's history.

6. The only uncontroverted Silurian inside Sino-Korean Plateau is the Gokshan- and Boliyangli formations of Pyeongnam Basin, Korean Peninsula.

7. The third period of the Paleozoic era, the Silurian follows the Ordovician period and precedes the Devonian.

8. Lichuan synclinorium from Silurian System to Triassic System has 7 combinations of oil source rock[sentence dictionary], reservoir and cap rock .

9. The Silurian and Devonian regional palaeogeography is controlled by the irregular orogenic process of the Northen Qilian from the Caledonian to Early Hercynian.

10. The discovery of the Silurian - Devonian oil and gas reservoir reveals a good exploration prospect.

11. In the Ordovician, Silurian Period, the Devonian, Carboniferous, the advent of low amphibians and ancient ancient reptiles.

12. From the Early Silurian large scale of retrogression had begun accompanying the Late Caledonian movement.

13. Diagenesis data indicate that the Silurian asphaltic sandstones are the products of multiple fillings of hydrocarbon.

14. Silurian System in Tarim Basin is distributed in an area of about 23.

15. The clastic rock reservoirs of Upper Devonian and Silurian and the carbonate reservoirs of Middle and Lower Ordovician are mainly distributed in the peri-cline area around central Tarim basin.

16. Most of the sequence is middle Cambrian to lower Silurian age.

17. By afternoon the atmosphere seems translucent blue, like some murky view must have looked through a Silurian sea.

18. The hydrocarbon generation content in Lower Cambrian and Lower Silurian is up to 60 % ～80 % of total.

19. But as the ecosystem recovered after the freeze, it expanded, with land plants becoming common over the course of the Silurian period.

20. Sq 1 , Sq 4, Sq 10 are three favorableexploratory sequence of the Silurian and Devonian in Tarim basin.

21. The occurrence of phosphoric dolomite indicates that a restricted bay or lagoon environment, and a semiarid climate during Telychian Stage of Silurian in this area or adjacent region.

22. The original rock of the "Lucky Red" Sandstone is sedimentary quartzitic sandstone, which can be traced back to the Silurian period 0.438 billion years ago.

23. The Tazhong paleo-uplift is a multiple oil-gas accumulation play, and medium-large scale reservoirs have been found in the Carboniferous, Silurian, Ordovician and Cambrian Systems.

24. The original bodies of gas-oil formation are Acritarch and Botryococcus from Precambrian to Silurian.

25. The geological and geochemical study results indicate that the metallogenetic materials came from the hydromica mudstones and shales of the Hanjiadian Group of Lower Silurian System.

26. The first fossil records of vascular plants—that is, land plants with tissue that carries food—appeared in the Silurian period.

27. The landslide occur in the Gao Jabian shale of Silurian Period.

28. It changed to ancient land due vertical movement in the end of the Silurian.

29. A rift trough along Mianxian - Lueyang ophiolitic melange belt was formed from Ordovician to Silurian.

30. Comprehensive researches have concluded that the Heishan ophiolite was formed in Nanhua Ordovician period and its structural location in Silurian period early Middle Devonian epoch.