山东省青岛市灵山岛下白垩统中发现鱼类和叶肢介化石

Discovery of Fish and Conchostracan Fossils in Lower Cretaceous in Lingshan Island,Qingdao,Shandong

山东省青岛市灵山岛下白垩统沉积岩地层首次发现鱼类和叶肢介化石。鱼类化石为Lecoptera sinensis Woodward(中华狼鳍鱼);叶肢介化石为Yanjiestheria Chen(延吉叶肢介属),分为4个种。该鱼化石属于热河生物群的典型分子,和该叶肢介属在胶莱盆地中广泛分布,属于早白垩世陆相河湖动物群。两类化石同层保存,化石保存完整,属于原地埋藏,所以含这些化石的地层应属于陆相沉积,而与海相沉积关系不大。这套地层因岩性和沉积环境与胶莱盆地南部地区的莱阳群法家茔组(K_1f)非常接近,建议使用法家茔组之名,而不使用因被认为是海相浊流沉积而命名的"灵山岛组"。

The in Lingshan Island, rocks preserved the fish and conchostracan fossils are firstly discovered from sedimentary strata of Early Cretaceous Qingdao, Shandong, China. The coordinate of discovery site is N35°45′08″, E120°9′12″. The fossils are dark mudstone, shale and french grey sandstone alternating layers. The fish is Lecoptera sinensis Woodward and the conchostracan is Yanjiestheria Chen, belonging to four species： Y. kyongsangensis （Kobayashi）, Y. wannanensis Chen et Shen, Y. chekiangensis （Novojilov） and Y. yumenensis （Chang et Chen）. Lecoptera was the typical element of the Jehol Biota. Meanwhile, both fish and conchostracan species were widespread in the Jiaozhou--Laiyang Basin of Shandong Province and attributed to continental lacustrine fauna of the Early Cretaceous. The strata that contained above fossils buried in situ should be part of continental depositions. Owing to the high similarity in the lithology and sedimentary environment with the Fajiaying Formation of the Laiyang Group in southern region of Jiaozhou--Laiyang Basin, it is suggested to use the Fajiaying Formation rather than ＂the Lingshandao Formation＂, which was named after the marine turbidite deposits.