【摘要】 前人曾经报道过湖北宜昌庙坡组的鹦鹉螺化石,但鹦鹉螺动物群的详细面貌特征仍鲜为人知。湖北远安真金剖面庙坡组产丰富的笔石、少量的腕足类、三叶虫、鹦鹉螺化石等,时代为中奥陶世末期至晚奥陶世桑比早期,在该组中新发现许多保存较完好的鹦鹉螺化石,多以立体黄铁矿化形式保存,少量以炭质薄膜的方式保存。经鉴定有4属5种,包括Lituites ningkiangense Lai,Lituites sp.,Ancistroceras sp.,Michelinoceras sp.和Cyclolituites sp.,其中以Lituites居多,可与国内外同期地层所产出的Lituites进行对比。在晚奥陶世全球古地理复原图的基础上重建Lituites的地理分布,显示该属主要分布在中低纬度热带海洋,并局限于冈瓦纳大陆东北边缘块体和瑞克洋东西两侧。更多还原

【Abstract】 The Miaopo Formation of the late Darriwilian to early Sandbian age in Yichang,Hubei Province contains rich graptolites,brachiopods,trilobites,and less common nautiloids.So far,the nautiloid fauna of this unit have been poorly studied.Recently,we collected many well-preserved nautiloid specimens from the Zhenjin section,Yuan’an County,about 80 km north of the Yichang City.They are mostly preserved as three-dimensional pyritic models or less often as flattened specimens.Five species assigned to four genera have been identified,including Lituites ningkiangense Lai,Lituites sp.,Ancistroceras sp.,Michelinoceras sp.,and Cyclolituites sp.Among them,specimens of Lituites have biostratigraphic potential for correlation of the Miaopo Formation with strata yielding Lituites elsewhere in the world.Based on the occurrences of Lituites in South China,Sibumasu,Tibet,and Baltica,the palaeobiogeographic distributions of this genus is restricted to the Rheic Ocean and in low latitudes surrounding the Gondwana Continent.更多还原