聂尔库组植物化石新材料及其地层意义

NEW MATERIALS OF FOSSIL PLANTS FROM THE NIEERKU FORMATION AT NANZAMU DISTRICT OF XlNBIN COUNTY,LIAONING PROVINCE

聂尔库组分布于辽宁东北部新宾县南杂木一带的苏子河盆地,为一套河湖相砂页岩沉积。该组含有较丰富的动、植物化石,但由于系统采集和研究不够,自建组以来,在地层时代和对比方面迄今仍是众说纷云。作者通过系统采集,共获植物亿石12属13种,化石组合面貌与英国威尔登植物群可以比较;与辽西的海州组、辽北—吉中营城组、黑龙江东部的穆棱组植物组合亦很相似,其时代大体相当于早白垩世尼殴克姆晚期。文中对我国首次发现的属种作了描述。

The paper is to report new materials of fossil plants collected from the NieerkuFormation at Nanzamu district Of Xinbin County, Liaoning Province.The plant-bearing Nieerku Formation is composed chiefly bf terrestrial coarse gravel sandstone,sandstone siltstone and shale intercalated with coal seams.The thickness of thisformation is 1403 metres.This florule consists of over 16 species belonging to 15 genera, including 3 newspecies. They belong to Equisetales (6.8%), Filices (25%), Caytoniales (6.8%),Cycadophytes (6.8%), Ginkgophytes (17.5%), Coniferales (31%) and Desmiophyllumsp. (6.8%) repectively. The presence of Equisetum burchardti,Coniopteris fittoni,Ruffordia goepperti, Cladophlebis browniana, C. dunketi, Sagenopteris mantelli, of.Androstrcbus nathorsti, Sphenopteris of.cretosa etc.in this florule indicates EarlyCretaceous age.In the botanical characters, the florule seems to be close to themiddle assemblage of the Ruffordia-Onychiopsis Flora.It bears a close resemblance ingereral aspect to some Early Cretaceous floras, such as the Muling Formation floraof easter Heilongjiang Province, the Yingcheng Formation flora of central Jilin—NorthernLiaoning Province, the Haizhou Formation flora of western Liaoning Province, andthe flora of the English Wealden.So the age of this florule is considered to be ofEarly Cretaceous, and most likely late Neocomian.