云南澄江早寒武世地层并论中国的Parabadiella,摩洛哥的Abadiella及澳大利亚的Abadiella huoi(英文)

LOWER CAMBRIAN STRATIGRAPHY OF CHENGJIANG, EASTERN YUNNAN, CHINA WITH SPECIAL NOTES ON CHINESEPARABADIELLA, MOROCCAN ABADIELLA AND AUSTRALIAN ABADIELLA HUOI

根据近来的发现 ,区域地层的阐明及生物在寒武系与前寒武系界线上下的变化 ,澄江早寒武世地层划分作了修订。早寒武世岩石地层名称的更换 ,年代地层及生物地层单位的分带这里作了简述。目前的岩石地层单位从下到上是渔户村组 (梅树阶 ) ,黑林铺组 (筇竹寺阶 ) ,红井哨组、乌龙箐组 (沧浪铺阶 )及山邑村组 (龙王庙阶 )。此层序可分为 12个组合带及 2个亚带。所有的组合带在中国西南地台区都有存在 ,但两个亚带在澄江是区域性的。云南东部震旦系与寒武系的界线暂时置于渔户村组小歪头山段的底界 ,位于小壳化石最早出现的下部。中国的Parabadiella ,摩洛哥的Abadiella及澳大利亚的Abadiellahuoi这里重新作了研究。Parabadiella及Abadiella是两个不同的属。模式标本的图片在这里再次刊出。澳大利亚的Abadiellahuoi一种应是Wutingaspis的一个新种 (WutingaspisjelliChangsp .nov .)。¨Opik( 1975 )的Dolerolenus( ?)sp .nov .一种应归属Parabadiellahuoi一种。Parabadiella是中国也是澳大利亚寒武系最古老的三叶虫。澳大利亚的Wutingaspisjelli的层位与摩洛哥Abadiella的层位相当 ,可与中国的Wutingaspis Eoredlichia带的上部对比。

Subdivision of the classic Lower Cambrian stratigraphy of Chengjiang County, eastern Yunnan, China, is revised in light of recent discoveries and interpretations of the regional stratigraphy, and recent interpretations of biotic changes across the Precambrian-Cambrian boundary. Modification to lithostratigraphic nomenclature, chronostratigraphic zonation, and biostratigraphic zonation of Lower Cambrian units are summarized. As presently recognized, lithostratigraphic units are, in ascending order, the Yuhucun Formation (Meishucun Stage), the Heilinpu Formation (Qiongzhusian Stage), the Hongjingshao and Wulongqing formations (Canglangpuian Stage) and the Shanyicun Formation (Longwangmiaoan Stage). Biostratigraphically, this succession is divided into 12 assemblage-zones and two subzones. All of the assemblage-zones are recognizable throughout the Southwest China Platform, but the subzones are of local utility. The position of the Sinian (Neoproterozoic)-Cambrian boundary in eastern Yunnan is tentatively placed at the base of the Xiaowaitoushan Member of the Yuhucun Formation, just below the first appearance of small shelly fossils. Chinese Parabadiella, Moroccan Abadiella and Australian Abadiella huoi are reviewed. We prefer to maintain Parabadiella and Abadiella as separate genera. Type specimens of these two genera are reillustrated. Australian Abadiella huoi is a new species of Wutingaspis jelli Chang sp. nov. and pik's (1975) Dolerolenus (?) sp nov. is a species referred to Parabadiella huoi Chang (1966). Parabadiella huoi is the oldest Cambrian trilobite not only in China but also in Australia. The stratigraphic position of Wutingaspis jelli in Australia and Abadiella in Morocco is equivalent to the upper part of the Wutingaspis-Eoredlichia Zone in China.