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Significance of ichnofossils to genetic stratigraphy——Examples from the Cretaceous of Alberta, Canad
Trace fossils represent both sedimentological and paleontological entities, representing a unique blending of potential......
This paper expounds a data-fitting algorithm for the double-weight neural network,and presents a new algorithm for the s......
此项研究的对象是晚全新世障壁后泻湖的演变。此湖后来演变成一个淡水沼泽(ValeStandiana)。很可能是从大约6kaBP开始,当冰后期海平面上升降低时,北亚得里......
【正】美国CCP公司日前宣布,受卡特里娜飓风的影响,自9月19日起,对其出产的所有液体和粉末涂料树脂涨价0.05美元/磅。据公司负责聚......
雅砻江锦屏一级水电站普斯罗沟坝址左岸山体内存在大量深部裂缝,它们不仅发育于坡向与岩层倾向相反的左岸,而且发育在卸荷带以内数......