论文部分内容阅读
Eoverbeekina一属系李四光教授于1933年所建,属型E.intermedia Lee标本采自贵州下二叠统栖霞组。该标本矿化甚剧,微细结构保存不好,作者在属征描述中认为其旋壁似由致密层和纤细蜂巢层组成。1934年陈旭教授在描述产于江苏船山地区栖霞组中的Eoverbeekina时曾对上述旋壁的判断提出疑义,认为该种旋壁是由暗色致密层,透明层和内暗色层组成,并指出即使在高倍镜下透明层里也见不到蜂巢结构(陈旭,1934,P.104)。至今(竹蜓)类研究者在华南多省二叠纪地层中已发现始费伯克(竹蜓)十余种,对晚二叠世的种其旋壁一般都
Eoverbeekina belongs to the Department of Professor Li Siguang was built in 1933, genus E.intermedia Lee specimens collected from the Guizhou Permian Qixia group. The specimen mineralization and drama, the fine structure of the preservation is not good, the author in the description of the character that the spiral wall as if by the dense layer and slender honeycomb layer. In 1934 Professor Chen Xu made a judgment on the above spinous wall when he described Eoverbeekina in the Qixia Formation in Chuanshan, Jiangsu Province. He believed that the spinous wall consisted of a dark dense layer, a transparent layer and an inner dark layer, and pointed out that even if The honeycomb structure can not be seen in the transparent layer under high magnification (Chen Xu, 1934, p. 104). So far (bamboo dragonfly) researchers in the South China provinces Permian strata have found more than ten species of Burke (bamboo dragonfly), the Late Permian species of their walls are generally