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1997～ 1 998年 ,在燕山中段的河北省兴隆 宽城地区 ,在古元古代长城群最底部的常州沟组 (约 1 80 0Ma)首次发现了大量圆盘形、椭圆形和香肠形 ,即Chuaria状、Shouhsienia状和Tawuia状的碳质压型化石 (Carbonaceouscompressions) ,或宏观藻类化石 .除对它们进行了形态学研究外 ,还采用化石本体浸解法、扫描电镜法和岩石薄片法对其中部分圆盘形和椭圆形化石 ,即Chuaria状和Shouhsienia状化石进行了初步的组织学研究 ,发现了呈群体状组织、假薄壁组织和薄壁组织等 3种多细胞组织类型 .所有这些多细胞组织的资料不仅为确定常州沟组新发现的碳质压型化石系多细胞藻类化石的生物学属性提供了重要的组织学基础 ,而且也为后生植物至少在古元古代晚期 ( 1 80 0Ma)就已出现的认识 ,提供了更可靠的化石证据
From 1997 to 1998, a large number of disc-shaped, oval and sausage-shaped discs were found for the first time in the Changchenggou Formation (ca. 180 Ma) at the bottom of the Great Paleoencient Great Wall Group in the Xinglong Kuancheng area of Hebei Province in the middle of Yanshan. That is, Chuaria-like, Shouhsienia-like and Tawuia-like carbonaceous compacts, or macroscopic algal fossils.In addition to their morphological studies, the fossil bodies, the scanning electron microscopy Disc-shaped and oval-shaped fossils, ie, Chuaria-like and Shouhsienia-like fossils, were subjected to preliminary histological studies and three multicellular types of tissue, such as herbarial, pseudopapular and parenchymal tissues, were found. All of these multicellular The data not only provided an important histological basis for the identification of the biological properties of the newly discovered carbonaceous fossil multicellular algae fossils in the Changzhou Goup Formation, but also contributed to the development of metazoan plants at least in the late Paleoproterozoic (180 Ma) The emerging wisdom has provided more reliable fossil evidence