安徽巢湖孤峰组的放射虫化石*

安徽巢湖下二叠统孤峰组含有极其丰富的放射虫化石,这些化石主要由阿尔拜虫类(albaillellids),球形多囊虫类(spherical polycystine)和十字多囊虫类(stauraxon polycystime)所组成,其中以oalbail-lella scalprata,P.longtanensis,P.sp.cf.P.longicornis,Phaenicosphaera mammilla,P.sp.A,Ruzhence-vispongus uralicus,R.sp.A和R.sp.B占绝对优势.对这3类化石进行了较为系统的描述,建立两个新种Latentifistula triradiata,Quadriremis flata,和两个组合带,即Pseudoalbaillella scalprata-P.sp.cf.P.longicornis和Phaenicosphaera mammilla-Ruzhencevispongus uralicus组合带,并且将这两个带与国内外相应时代的组合带进行了比较,讨论了这两个带的时代.

FOSSIL RADIOLARIA FROM KUFENG FORMATION OF CHAOHU, ANHUI

Recently, diverse, abundant and well-preserved radiolarians have been discovered from the chert of the Kufeng Formation (Permian)in Chaohu, Anhui, among which fourteen genera, thirty-six species (including two new species, Latentifistula triradiata and Quadriremis flata), and one unnamed spheroidal form are recognized and described. These radiolarians are composed of three basic type microfossils, namely, the albaillellids, the spherical polycystine and the stauraxon polycystine, with such dominant elements as Pseudoalbaillella scalprata, P. longtanensis, P. sp. cf. P. longicornis, Phaenicosphaera mammilla, P. sp. A, Ruzhencevispongus uralicus, R. sp. A and R. sp. B.Based on the distribution pattern of the radiolarians in the Kufeng Formation, two assemblage zones have been proposed, namely, the Pseudoalbaillella scalprata-P. sp. cf. P. longicornis Assemblage in the lower part and the Phaenicosphaera mammilla-Ruzhencevispongus uralicus Assemblage in the upper part. Biostratigraphically, the first aemblage is correlated with the Pseudoalbaillella scalprata-P. fusiformis Assemblage from the Kufeng Formation at Longtan, Nanjing and the Pseudoalbaillella sp. C Assemblage of Southwest Japan, while the second assemblage is considered as equivalent to the Phaenicosphaera mammilla Assemblage from the Kufeng Formation at longtan, Nanjing and Hegleria mammifera(= Phaenicosphaera mammilla Sheng et Wang) from West Texas, USA and correlated with the Ruzhencevispongus uralicus Assemblage of the Southern Urals, USSR. Therefore, it is considered that the two zones fall into early Maokouan and middle to late Maokouan stage respectively, and correspond to early and middle to late Guadalupian.