北京西山宏观藻类化石的发现

DISCOVERY OF MACROSCOPIC ALGAE-CHUARIDS ON WEST HILLS NEAR BEIJING CITY

1980年,作者于北京西山青白口系的命名地点——青白口村西,发现了宏观藻类化石。这些化石呈椭圆形、卵形、肾形及鞋底形等多种形态,有的带有拟茎构造。它们与广泛出现在我国东部前寒武系相当地层中的宏观藻类可以对比。

Since 1962, a large number of Chuarids have been found in the Precambrian system in China. The author has also found the large individuals of Chuarids in the middle part of Changlongshan formation on West Hills near Beijing city in 1980, where the Qingbaikou system occurrsed. These Chuarids of various kinds, which are small and circular carbonaceous fossils, have attracted many attentions.These macroscopic algae-chuarids are similar to those in the Precambrian systems in Hebei and Anhui provinces in their size, shape and structure. They are described as follows.1. Shouhsienia cf. axicula Zheng; 2. Longfengshania qingbaikouensis Xiao (sp. nov.); 3. L Stipitata Du; 4. Pumilibaxa cf. huaiheiana Zheng; 5. Nephroformia sp.;The Chuarids found at West Hills near Beijing are characterized by the following features:1.The Fossils are predominantly composed of black carbonaceous membranes, and su-bordinately brown limonitic membranes.2.The individuals of them are bigger than those in Hebei and Anhui.3.The fossils varies in shapes, and some of them have parastem and rhizoid structure.