Algae, echinoderm, bivalve, and reef-building organisms including bryozoan, coral, stromatoporoids, and sponge are conserved in the carbonate of the Yijianfang Formation.

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Based on lots of indoor observation, tests and analyses by 4 wells in the two areas, it is discovered that authigenic quartz in sandstone can be divided into three kinds:narrow,width and fine crystal. Species and composition of sandstone are the main factors which controled the formation of authigenic quartz.

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Leaf secondary veins 7-10 on each side of midvein; branches of 2nd- or 3rd-year growth with grayish lamelliform waxy scalelike trichomes

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Chemical elements (for example, silicon and selenium )doped for use in electronics are to be classified in this Chapter,provided that they are in forms unworked as drawn, or in the form of cylinders or rods.

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One's studies will have optical variable features such as fluorescence, emiting or chromotropic of material, usually plastic sheeting or beanies, made into definite shape such as a circle or polygon of both sides of the paper; it is characterized by the naked eye will recognize, and photocopiers are difficult to reproduce.

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Copper plate was employed as substrate,ethanol as carbon source,and iron chloride or iron nitrate as catalyst precursor .

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A multiplying factor derived form the load sharing between the two lites, of equal or different thicknesses and type ( including the layered behavior of laminated glass under long duration loads), in a sealed IG unit.

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We have observed the structure of these dune sands and analyzed the grain-size,surface textural features and several main chemical elements of them,the results showed that:(1) these dune sands have some eolian structure characteristics which are similar to the recent dune sands;(2) they are also similar to the recent dune sands in grain-size components,and parameters of Mz,?滓,Sk and Kg,as well as in several main chemical components;(3) the scatter plots of Mz-?滓,SiO2-Al2O3+TOFE and the probability curves of grain-size showed that these paleo dune sands are different from paleosols and fluvio-lacustrine facies but are consistency with recent dune sands;and(4) the quartz sands have well roundness and some surface textural features such as dish-shape pits,crescent-shape pits,pockmarked pits,upturned cleavage plates,siliceous precipitates and siliceous crevasses,indicating that they had been carried for a long time by the wind.

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