辽南复州湾本溪组下部植物群的发现

<正> 辽南复州湾地区本溪组出露较好,以往在上部即三棱山灰岩及以上层位研究较详,而下部研究甚少,未见古生物方面的报道,其地质时代总是同上部一起看作相当莫斯科期,有人曾怀疑该段地层有属早石炭世的可能(辽宁区域地质志,1989)。本文对复州湾区本溪组下部地层测制了两条剖面,三棱山剖面在以往资料中常见涉及,此处不再赘述,而位于三棱山西北约400m、丁屯村东的水泥厂附近(新开大路两侧),下部层位发育、出露甚好(图1),自上而下详述如下:

Discovery of flora from the lower part of the Penchi Formation in Fuz-houwan, southern Liaoning

This paper first reports and systematically discusses the features of the flora from the lower part (below the Sanlengshan Limestone) of the Penchi Formation in Fuzhouwan region of Liaoning province, Northeast China. This flora consists of 8 genera and 15 species characterized by a number of Mesocalamites and closely resembles the Namurian A Period flora of western Europe, Jingyuan Formation flora of Gansu Province, the Early Carboniferous flora in Taizihe realm of Liaoning Province and the Namurian A Period flora of the southern Tarim Basin. Its age is late Early Carboniferous, that is, the Namurian A Period. A new assemblage, the Mesocalamites cistiformis-Linopteris neuropteroides Assemblage, is recognized. The writers discuss the time of the Penchi Formation and propose that the Penchi Formation of this region belongs to late Early Carboniferous to early Late Carboniferous (up to Moscovian), which is a new achievement in the study of the North China Platform.