甘肃兰州盆地咸水河组下红泥岩中的小哺乳动物化石

兰州盆地咸水河组下红泥岩共产有15属25种哺乳动物化石。位于下红泥岩中部的峡沟和上西沟等地产有11属20种化石（Amphechinus cf. A. rectus, A. cf. A. minimus, Amphechinus sp., Soricidae indet., Sinolagomys kansuensis, S. cf. S. major, Yindirtemys grangeri, Y. xiningensis, Y. ambiguus, Eucricetodon sp., Tachyoryctoides? sp., Parasminthus asiae朿entralis, P. tangingoli, P. parvulus, Parasminthus spp., Sinosminthus sp., Heterosminthus lanzhouensis, Litodonomys huangheensis和Didymoconus berkeyi）,被称为峡沟动物群。其中8属11种与党河Taben朾uluk动物群共有。两者的时代大致相当,为晚渐新世。位于瞿家川附近的下红泥岩下部产有：Desmatolagus cf. D. gobiensis, Ordolagus sp.,Tataromys plicidens, Tsaganomys altaicus, Amphechinus cf. A. minimus和Sinolagomys kansuensis等。该动物群的面貌显得比峡沟动物群的要老,而与其下的黄砂岩中所产的南坡坪动物群较相似,其时代有可能为早渐新世晚期。如果更多的化石证明是这样,那么在兰州盆地同一时代的同一动物群可产于不同的岩层（黄砂岩和下红泥岩下部）,而代表不同时代的不同的动物群产于同一岩性地层中。早、晚渐     

湖北恩施志留系秀山组顶部的牙形刺及其地层意义

本文描述了湖北恩施太阳河灯草坪剖面志留系秀山组顶部灰岩夹层中的牙形刺。秀山组顶部的灰岩产出较丰富的牙形刺化石,共10属14种,包括Pterospathodus eopennatus,P.a.cf.angulatus,Apsidognathus sp.,Ozakodina paraplanussima,Ozakodina sp.,?Distomodus sp.,?Tuberocostadontus sp.,Coryssagnathus shaannanensis,Wurmiella recave,Wurmiella sp.,Oulodus shiqianensis,Oulodus sp.,Pseudooneotodus beckmanni,Distomodus sp.。根据牙形刺的产出情况,可识别出两个牙形刺带。秀山组顶部灰岩可归入Pterospathodus eopennatus超带的P.eopennatus ssp.n.2带。需要指出的是,秀山组最顶部样品发现了P.a.cf.angulatus,因此,秀山组顶部的时代延伸至Pterospathodus celloni超带的P.a.angulatus带,时代为兰多维列世特列奇早-中期。     

华南上扬子区下奥陶统红花园组顶界的穿时性

在早奥陶世弗洛早期,广布于华南扬子台地的浅海碳酸盐台地沉积(红花园组)逐渐被陆源碎屑沉积所替代,而海洋生物分异度快速升高,随后出现了奥陶纪生物大辐射的第一次高潮。因此下奥陶统红花园组顶界附近的岩石地层学和年代地层学研究具有重要意义。目前该组顶界的穿时性及其横向分布规律尚无定论。通过对贵州桐梓红花园、习水吼滩、湖北兴山古洞口和湖南张家界温塘4个剖面红花园组牙形石动物群的系统分析,从下至上识别出了3个牙形石带,分别是Serratognathus diversus带、Prioniodus honghuayuanensis-Oepikodus communis带和Oepikodus evae带。采用统一的红花园组顶界定义,即以中—厚层亮晶颗粒灰岩的消失作为红花园组与上覆地层之间的界线,结合研究剖面和前人牙形石生物地层学资料,发现上扬子区红花园组顶界具有明显的穿时性,而且这种穿时性在空间上还具有一定的规律性。上扬子区红花园组顶界大部分位于P.honghuayuanensis-O.communis带内;从上扬子区中部向台地南北两侧的边缘区,红花园组顶界大体上逐渐升高至O.evae带;而在靠近陆源碎屑沉积的西部地区顶界则降低至S.diversus带。造成这一现象的主要控制因素除了海平面的升高外,可能还与陆源碎屑供应的增多有关。     

湖北兴山古洞口下奥陶统几丁虫

系统分析兴山古洞口下奥陶统,包括南津关组、分乡组、红花园组及大湾组底部的几丁虫微体生物化石。鉴定几丁虫5属14种,含早奥陶世特征种Eremochitina baculata,早中奥陶世常见种Conochitina decipiens,以及华南上扬子区早奥陶世常见属种Euconochitina fenxiangensis和Lagenochitina chongqingensis。E.baculata是北冈瓦纳地区弗洛早中期的特征带化石,本文的材料为该种在华南的首次确切报道,且产出层位略低,为特马豆克期。在华南,常见于特马豆克晚期的带化石Euconochitina symmetrica在该剖面的同时段地层中暂未被发现,但形态上与之高度相似的Euconochitina fenxiangensis在该时段大量出现。比较以往发表的数据后发现,E.fenxiangensis在华南的分布广泛且产出层位较为稳定,较之E.symmetrica更易获得,或可将其作为特马豆克晚期至弗洛初期区域内地层对比的一个有效卡尺。     

甘肃靖远、景泰早石炭世维宪期植物群

祁连山和河西走廊区石炭纪地层发育,动植物化石丰富,是研究我国海陆交互相石炭系的重要地区。臭牛沟组系袁复礼(1925)所建,标准地点在甘肃武威西南35km的臭牛沟,据其中的腕足类和珊瑚化石的研究,确定其时代为早石炭世维宪期(Visean)。研究材料来自甘肃景泰和靖远的早石炭世臭牛沟组,这里的臭牛沟组厚约120m左右,由泥质页岩夹煤线、粉砂岩及薄层泥灰岩、灰岩组成,为潮间潟湖相至滨海沼泽相及泥炭沼泽相沉积。含丰富的植物化石,主要分子有Sublepidodendron sp. , Lepidodendronciyaoense sp. nov. , Lepjingyuanense sp.nov. , Lepidodendron volkmannianum , Lep. gansuense sp. nov. , Lep. shanyangense, Lep. cf. aolungpulukense,Lep. sp. 1, Lep. sp. 2, Cathaysiodendron jingyuanense, C. cf. incertum, Stigmaria ficoides, Lepidostrobophyllum cf. lanceolatum, L. rotundi folium sp. nov., Lepidostrobus sp. 1, L. sp. 2, Bothrodendron ruchengense, Archaeocalamites scrobiculatus , Hamatophyton uerticillatum , Cardiopteridium spetsbergense , C. podozamioides,Triphyllopteris collombiana , Triphyllopteris sp. ( cf. T. lescuriana Lesquereux), Rhacopteris sp. , Adiantites gothanii, Sphenopteris sp. 1, Sphenopteris sp. 2, Rhodeopteridium hsianghsiangense, R. cf. hsianghsiangense,R. cf. chinghaiense, Rhodeopteridium sp. (cf. R. lipoldi) , Paripteris gigantea , P. cardiopteroides, Linopteris sp. , Codonospermum sp. , Trigonocarpus spp. , Cardiocarpus cordai, Cordaites sp. (cf. C. schenkii Halle) 。其下伏地层前黑山组中有菊石Kazakhstania sp．,为下石炭统底部Gattendor fia带分子,其余还有孢子化石、腕足类和植物,表明为杜内期沉积;而上覆地层靖远组底部有牙形石Gnathodus bilineatus bollandensis,G．bilineatus bilineatus,Paragnathodus commutatus及P．nodosus,是我国下石炭统顶部德坞阶的一个牙形石带化石;筵化石：Mediocris breviscula,M．pilatus,M．cf．minima,Eostaffella galinae,E.cf．mediocris是我国和卅l组常见分子,也产于贵州罗甸的德坞阶(相当于早期纳缪尔阶)。臭牛沟组产有大量孢子,可分3个孢子带,分别可以和西欧维宪期孢子带(PV,TC,NM)对比。在当前的植物群中Cathaysiodendron及Bothrodendron ruchengense,Le pidodendron shanyangense的发现,对于研究早石炭世植物地理区的划分,华南和西北同期植物群的对比及东方型鳞木类的演化均具有重大意义。     

腕足动物小嘴贝类Axiodeaneia属在广西的发现及意义

文中描述了分别采自广西田东陇合屯剖面杜内阶底部和桂林南边村剖面法门阶顶部的Axiodeaneia属的两个种:Axiodeaneia cf.anxia Havlicek,1979和Axiodeaneia xui sp.nov.前者以壳体侧边缘略内凹和壳体较宽为特征,而后者以其独特的壳褶分布形式为特征,不同于该属的其他种类...     

内蒙古清水河及山西偏关奥陶系鹦鹉螺

1977年8月,笔者与林尧坤,周志毅,杨学长,王绍鑫,沈后,罗坤泉,姚宝琦等同志,对内蒙古清水河以及山西偏关地区奥陶纪地层进行了观察并测制剖面,采集了一些鹦鹉螺化石。经鉴定,计有12属、19种,其中10新种、2未定种。现按其地点层位列述如下: 1.内蒙古清水河刘家窑剖面(冶里组),有Ectenoceras cf. subcurvatum Kobayashi, Dakeoceras neimengguense (sp. nov.), Dakeoceras circulare (sp. nov.), Clarkoceras calvini Ulrich, Foerste et Miller, Clarkoceras sp,(野外编号:QL 19)。2.山西偏关老营剖面(亮甲山组),有Yehlioceras yehliense (Grabau) emend Obata, Kaipingoceras slenderforme Obata, Coreanoceras brevi     

陕西陇县上奥陶统背锅山组牙形刺

背锅山组系车福鑫(1963)所建,标准剖面在陕西陇县新集川公社李家坡西北的背锅山。根据珊瑚Fauistella sp., Agetolites sp., Plasmoporella sp., Catenipora sp.及腕足类Glyptorthis sp.,车氏将背锅山组归属于上奥陶统。嗣后,中国科学院南京地     

中国间摇蚊属一新种及一新记录种记述(双翅目:摇蚊科)

记述间摇蚊属Paratendipes 1新种:尖窄间摇蚊P.angustus sp.nov.和1中国新记录种:苏步间摇蚊P.subaequalis(Malloch).正模标本存放于南开大学生命科学学院摇蚊学研究室,副模标本保存于台州学院生物系.     

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.     

A NEW EARLY ORDOVICIAN CONODONT GENUS FROM THE SOUTHERN MONTAGNE NOIRE, FRANCE

Abstract:  Two species of a new Tremadocian (Early Ordovician) conodont genus from the Saint Chinian Formation of the southern Montagne Noire, France, are erected: Hammannodus sarae gen. et sp. nov. and Hammannodus juliae gen. et sp. nov. They were found within a single storm-induced limestone nodule interbedded with offshore shales belonging to the regional Shumardia ( C .) pusilla (trilobite) Biozone, and to the Paltodus deltifer deltifer (conodont) Subzone. This conodont record is associated with the episodic development of carbonate productivity in temperate waters of the Montagne Noire platform, a process absent in neighbouring platforms of north-west Gondwana. The apparatus is composed of five coniform pyramidal elements occupying P and S positions and one bicostate element in the M position, having three or two sharp costae, respectively, with a subtriangular basal outline.     

长江三峡东部早奥陶世早期的几丁虫

该文介绍了国内外关于早奥陶世早期的几丁虫研究现状,描述了峡东地区早奥陶世早期分乡组的几丁虫3属6种:Conochitina symmetrica,Conochitina cf.pomoti,Conochitina sp.A,Conochitina sp.B,Lagenochitina cf.combazi,Cyathochitina sp.。根据共生的笔石和牙形石以及这些几丁虫在世界其它地区的地质分布,讨论了其时代与对比问题。指出了长江三峡东部早奥陶世早期的几丁虫面貌与世界各地同期几丁虫生物古地理的亲缘关系。     

ORDOVICIAN NAUTILOID FAUNA FROM LUNSHAN, JURONG, JIANGSU

The fossil nautiloids described in this paper were collected in 1984 and 1985 from Lunshan, Jurong in Jiangsu; there the Ordovician strata are well developed and may be divided in descending order into seven formations as follows:Upper Ordovician: Wufeng Formation Tangtou FormationMiddle Ordovician Pagoda Formation Lower OrdovicianKuniutan FormationDawan FormationHunghuayuan FormationLunshan FormationThese nautiloids comprise 36 species belonging to 13 genera (including one new genus and 11 new species), namely,Middle OrdovicianPagoda FormationSinoceras chinense (Foord), Michelinoceras changjiangense Chen, densn (Y), M. paraelongatum Chang.Lower OrdovicianKuniutan FormationRhynchorthoceras jurongense sp. nov., R. lunshanense sp. nov., Dideroceras wahlenbergi (Foord), D. holmi Flower, Michlinoceras irregulare sp. nov., Kotoceras gaoluncunense sp. nov.Dawan Formation.Cochlioceras yantzeense Chang, Chisiloceras ichangense Wang, C. yaoshanense Qi, C. changyangense (Chang), Protocycloceras deprati Reed, P. hupehcnse (Shimizu and Obata), P. sichuanense Wang, P. remotum Lai, P. gangshanense sp. nov., P. siphosedimentum Pan, P. chaoi sp. nov., P.shishantouense sp. nov., P. gaojiabianense sp. nov., Changyangoceras gaojiabianense sp. nov., Gangshanoceras jurongense gen. et sp. nov., G. densum gen. et sp. nov., Michelinoceras cf. dayongense Lai, Troedssonella lunshanensis sp. nov., Mesosendoceras leei (Y), Vaginoceras peiyangense malukonense Chen, Dideroceras mui (Chang), D. gaoluncunense sp. nov.     

新疆塔里木盆地奥陶纪冷水型胞石

文内描述了在新疆塔里木盆地覆盖区QB-1井(黑土凹线)和TZ-32井(却尔却克组)中发现的3种奥陶纪冷水型胞石.即Tanuchitina sp.cf.achabae Paris,Linochitina pissotensis Paris和Siphonochitina bella sp.nov.,时代为中到晚奥陶世。冷水型胞石在奥陶纪主要分布于冈瓦纳大陆北缘和英国等中高纬度地区,沿冈瓦纳大陆边缘向北的洋流将这些中高纬度的表层冷水型胞石带入低纬度的塔里木板块内,热带下沉作用能使它们在深水的盆地相中获得适宜的环境温度而得以生存。     

内蒙古乌海大石门奥陶系牙形刺和Histiodella动物群发现的意义

本文描述了内蒙古乌海大石门剖面奥陶系的牙形刺动物群:下克里摩里组主要有Histiodella kristinae,H.holodentata,H.wuhaiensis sp.nov.,Polonodus newfoundlandensis和Paroistodus horridus等,应归属于中奥陶统达瑞威尔阶(Darriwilian)之Histiodella kristinae带,并在同一剖面上与笔石Pterograptus elegans带和Didymograptus murchisoni带下部相当;下克里摩里组顶部产Histiodella kristinae,Baltoplacognathus cf.reclinatus,Periodon aculeatus和Protopanderodus rectus等,所以大石门剖面的Histiodella kristinae带顶部可能已与北欧Pygodus serra带之底部相当;乌拉力克组底部的砾状灰岩透镜体产有牙形刺Pygodus anserinus?,Protopanderodus liripipus,Yangtzeplacognathus protoramosus和Dapsilodus viruensis等,其中Pygodus anserinus?Pa分子(器官种的一组成分子)的口面瘤齿列的瘤齿比较粗糙,与典型的Pygodus anserinus稍有不同,且在牙形刺十分丰富的样品中仅有一枚此种之Pa分子,所以本文尚有疑问地把这层砾状灰岩归入Pygodus anserinus带,同时不能排除把它归入Pygodus serra带顶部Yangtzeplacognathus protoramosus亚带的可能。由于此剖面牙形刺化石与丰富的笔石共生,为牙形刺带与笔石带的精确对比提供了直接证据。Histiodella动物群在此剖面的发现,不仅具有十分重要的地层意义,而且具有明显的岩相古地理意义。本文详细描述了新种Histiodella wuhaiensis并讨论了Histiodella属5个种之区别。     

安徽石台下、中奥陶统紫台组的牙形刺

下、中奥陶统紫台组以紫红色泥质灰岩、瘤状泥质灰岩为特征,具有稳定的空间分布范围,沿扬子台地东南缘呈条带状分布,与扬子台地上发育的湄潭组、大湾组等大致同期。作者研究了安徽石台栗阳柳树亭剖面紫台组的牙形刺,共描述19属23种,识别出四个牙形刺带,从下至上分别是Oepikodus evae带、Baltoniodus triangularis带、Baltoniodus navis带和Paroistodus originalis带,并可与同期笔石带对比。除扬子区外,紫台组还可与欧洲、阿根廷前科迪勒拉等地区的同期地层对比。     

重庆城口大塘口下奥陶统红花园组和湄潭组下部的几丁虫

文中图示和描述了重庆城口大塘口奥陶系红花园组和湄潭组下部营盘段的几丁虫计 6属, 17种。其中包括 7个未定种和 3个新种 (Conochitinadatangkouensissp. nov., C. wengxigouensissp. nov., Rhabdochitinachenk ouensesp. nov. )。讨论了几丁虫的地理和地层分布特点及其与笔石生物带的关系,阐明了红花园组和湄潭组下部营盘段不同笔石带(A. filiformis, D. bifidus和A. suecicus笔石带)中几丁虫的组合特征,并与国外同期地层几丁虫组合进行了对比。     

峡东地区上奥陶统高庙坡组球节子类及其它多节类三叶虫

系统描述湖北宜昌和秭归新滩晚奥陶世庙坡组球接子类及多节类三叶虫动物群中的１４种,分属于９属、７科、。根据化石保存状态、挤压变形以及个体发育特征,对前人所报道的产于本组的有关三叶早作了大量归并、转移和重新厘定,新的材料支持解释Telephiana longicephala的性双形现象。Ａtractopyge系首次在庙坡组中发现,以往它在三峡地区只见于临湘组。文中还将新疆的一个保留命名种Ｌonchodomas cf.yohi重新命名为Ｌonchodomas zhangi sp.nov.。     

NEW MATERIAL OF AZYGOGRAPTIDAE AND ITS SIGNIFICANCE

Among the graptolites collected by Unit 734 from the Lower Ordovician Qiaotingzi Formation (corresponding to the Ningkou Formation) at Xiayanzhai of Jishou, Hunan, more than ten specimens particularly chosen from the collection were handed over to the writer for. study. These spe cimens preserved as mere carbonaceous films in grey green slate belong to one new genus and the same new species named by the writer Jishougraptus mui gen. et sp. nov. in association with Didymograptus cf. praenuntius     

Horizon of the oldest known bryozoans (Ordovician)

Among the six species of fossil bryozoans described by Xia et al. [Xia, F.S., Zhang, S.G., Wang, Z.Z., 2007. The oldest bryozoans: new evidence from the late Tremadocian (Early Ordovician) of East Yangtze Gorges. Journal of Paleontology 81 (6), 1308–1326] from the Fenghsiang Formation of the Chenjiahe section of Yichang and the Guanzhuangping section, Liujiachang Town of Songzi, the Yangtze Gorges, Nekhorosheviella nodulifera occurs in the pristinus Conodont Subzone (lower Subzone of deltifer Conodont Zone) and the five other species are associated with the conodont Paltodus deltifer deltifer and the graptolites Acanthograptus sinensis and A. erectoramus. Based on the conodonts and graptolites, this bryofauna stratigraphically corresponds to the A. sinensis Graptolite Zone or P. deltifer Conodont Zone. The bryofauna is of Tremadocian Age (Early Ordovician) and represents the oldest bryozoans so far as known.