摘要
在燕山长城系串岭沟组发现的 Parachuaria化石 ,轮廓清晰 ,保存完好。通过浸解法、实体浸解法和岩石磨片法对 Parachuaria化石的研究表明 :化石层中的古片藻 L aminarites可能就是宏观藻类 Parachuaria化石的残体和碎片。除此以外 ,还有许多光面和粗面小球藻及其他多细胞藻类残体碎片。碳质宏观藻类 Parachuaria化石可能是古老的褐藻类多细胞植物。化石的发现 ,其时代层位较老 ,是原始藻类演化发展的一个重要标志 ,代表我国前寒武纪的长城系一个独有的生物组合。由于化石层位稳定 ,从而为长城系的划分和对比提供了新的化石依据。Parachuaria化石的发现不仅丰富了前寒武纪生物地层研究的内容 ,同时也为古藻类演化和特征的研究提供了新资料 ,因此具有重要的生物演化和地层意义。
Parachuaria discovered from the Chuanlinggou Formation of the Changcheng System in the Yanshan region are clear in the outline and well preserved. A study on the Parachuaria fossils by means of HF acid-resistant maceration, fossil maceration and petrologic section methods indicates that Laminarites in the fossil bed may be remains and fragments of macro-algal Parachuaria fossils. Besides, there are a lot of Leiominuscula and Trachysphaeridium minor and other multicellular algae fragments. The carbonaceous macro-algal Parachuaria fossils may be ancient multicellular brown algae. Parachuaria is an important criterion of the evolution of primitive algae and is a representation of unique features and characteristics of bioassemblage of the distinctive Precambrian stage of China. Parachuaria provides a basis for stratigraphic division and correlation of the Changcheng System as a result of the constancy of the fossil bed. The discovery of Parachuaria not only enriches the substance of the research of Precambrian biostratigraphy but also provides material for the research of the evolution of algae and its characteristics. Description of new species Chuariaceae (Wenz), 1938 emed Duan, 1982 Parachuaria Zhu et Sun, 2002, Parachuaria glabra sp. nov. Description fossils are discoid in outline, carbonaceous. Periphery smooth, diameter is generally 3～6 mm, minimum 0.5 mm, maximum 10 mm. Shield surface smooth, covex lens in cross section. Comparison This species is like Chuaria circularis in shape, but, the individual is larger, periphery smooth, no-concentric ring. Occurrence Chuanlinggou Formation of in the Changcheng System in Jixian, Xinglong County.
出处
《地质学报》
EI
CAS
CSCD
北大核心
2004年第6期721-725,共5页
Acta Geologica Sinica
基金
国家自然科学基金 (编号 40 3 72 0 0 3 )
中国地质调查局地调项目 (编号 2 0 0 3 13 0 0 0 0 5 2 )资助的成果
