中文摘要：

文中系统描述了鄂尔多斯盆地南缘淳化县铁瓦殿、岐山县烂泥沟上奥陶统生物礁中的层孔虫化石,包括2目5属9种,分别为囊层孔虫（Cystistroma）、拉贝希层孔虫（Labechia）、穿孔层孔虫（Forolinia）、网格层孔虫（Clathrodictyon）和蜂巢层孔虫（Eccli madictyon）。建立拉贝希层孔虫新种两个,淳化拉贝希层孔虫（新种）La-bechiachunhuaensisJiang sp.nov.,铁瓦殿拉贝希层孔虫（新种）LabechiatiewadianensisJiang sp.nov.。这些属种的发现和建立拓展了中国奥陶纪层孔虫的内容。另外,从分布区域看,囊层孔虫、拉贝希层孔虫、穿孔层孔虫和网格层孔虫是淳化县铁瓦殿上奥陶统生物礁的主要造礁生物;而岐山县烂泥沟上奥陶统生物礁只产少数蜂巢层孔虫。

英文摘要：

This paper systematically describes the stromatoporoids from the Ordovician reefs in the southern edge of the Ordos Basin,N.China,including 2 orders,5 genera and 9 species.They are Cystistroma,Labechia,Forolinia,Clathrodictyon,Ecclimadictyon.This study builds two new species： Labechia chunhuaensis sp.nov.,Labechia tiewadianensis sp.nov.Cystistroma,Labechia,Forolinia and Clathrodictyon occur in the breccia of the reef-front facies of the Upper Ordovician reef at Tiewadian,Chunhua County,Shanxi Province,while Ecclimadictyon is the only reef builder in the Upper Ordovician reef at Lannigou,Qishan County,Shanxi Province.