赣东北铅山县二叠纪雾霖山组底部含Shouchangoceras的海相动物群？…

赣东北雾霖山组长期被视为吴家坪期的陆相沉积,在其近底部发现含Ｓｈｏｕｃｈａｎｇｏｃｅｒａｓ的海相化石群,表明该岩组并非纯陆相沉积,其底部的地层时代亦不排除茅口晚期的可能。     

古生代轮藻类的演化和分类

本文通过对古生代轮藻类群形态结构的比较研究,认为Ｔｒｏｃｈｉｌｉｓｃｕｓ和Ｍｏｅｌｌｅｒｉｎａ具有不同的起源。前者藏卵器包围细胞右旋具横脊,底部结构两侧对称,起源于Ｓｙｃｉｄｉｕｍ;后者的左旋轮藻类包围细胞简单,底部结构辐射对称源于具简单直立包围细胞的Ｘｉｎｊｉａｎｇｏｃｈａｒａ。根据底部结构的对称性,将轮藻门划分为Ｓｙｃｉｄｉｐｈｙｃｅａｅ和Ｃｈａｒｏｐｈｙｃｄｅａｅ两个纲,Ｓｙｃｉｄｉｐｈｙｃ     

江西长兴组顶部与大冶组底部牙形刺的再研究

本文描述了江西信丰铁石口镇古南桃江剖面和修水清水岩乡东岭剖面长兴组最顶剖与大冶组（或铁石口组）最底部粘土层的牙形刺共１属６种和亚种,并把长兴组最顶部和大冶组最底部粘土层分别归属于Ｃｌａｒｋｉｎａ ｃｈａｎｇｘｉｎｇｅｎｓｉｓ ｙｉｎｉ－Ｃ．ｍｅｉｓｈａｎｅｎｓｉｓ ｚｈａｎｇｉ和Ｃｌａｒｋｉｎａ ｍｅｉｓｈａ－ｎｅｎｓｉｓ ｍｅｉｓｈａｎｅｎｓｉｓ带,它们分别可与浙江长兴煤山标准剖面长兴组最顶部和     

加拿大北极地区黄昏鸟化石

加拿大北极地区Ｂｙｌｏｔ岛晚白垩世陆相沉积中发现一黄昏鸟化石。这是首次在极地地区发现这类不会飞行的已绝灭的潜水鸟类,该地点也是白垩纪最晚期的黄昏鸟产地。新材料的形态构造与Ｈｅａｐｅｒｏｒｎｉｓ ｒｅｇａｌｉｓ比较接近,但它个体大,颈椎椎体后部特别向两侧扩展,椎体侧凹亦特别大而深等,具特化的性状,因而建一新属新种：Ｃａｎａｄａｇａ ａｒｃｔｉｃａ ｇｅｎ．ｅｔ．ｓｐ． ｎｏｖ．。     

罕见的双头蛇

１９９７年９月９日下午,山东莱州市朱桥镇后杨村村民杨明耀,在自家院内收获的花生蔓中发现一条极为罕见的双头蛇。这条怪蛇长约３０ｃｍ,最粗处直径约１．１ｃｍ,头长约２ｃｍ,两头合在一起宽约２．５ｃｍ,头与头之间底部有一小蹼相连,两头最大分距可达到３．１ｃ...     

一块“鸟喙”化石

鄂尔多斯盆地在文化大革命期间,一度曾因陕甘宁边区政府在延安建立的政治原因,被称为陕甘宁盆地。该盆地是我国中生代陆相沉积地层分布广泛,发育良好,地层层序较为清晰,构造运动相对平稳,陆相沉积类型众多的地区之一。也是全球中生代陆相沉积地层发育较好的地区之一。该盆地地层中蕴藏着十分丰富的煤炭、天然气、石油、岩盐、粘土矿等沉积矿产,特别是盆地中部的侏罗系地层储藏着世界级的优质大煤田,储藏量惊人,     

MHC Class Ib grc—G／C基因的研究进展

ＭＨＣ的ｃｌａｓｓ基因,可分为经典的ｃｌａｓｓ Ｉ和非经典的ｃｌａｓｓＩ,后者称ｃｌａｓｓ Ｉｂ。ｃｌｓｓ Ｉ与β／β Ｔ细胞相关在细胞表面高密度表达,ｃｌａｓｓ Ｉｂ在细胞表面弱表达,其功能尚不清楚,ｃｌａｓｓ Ｉｂ的基因区域中含有一个ｇｒｃ区域,ｇｒｃ基因的ｒｃｃ,ｆｔ,ｄｗ－３三组基因组成。     

中国辽宁省始新世水杉的研究

以辽宁省抚顺早始新世古城子组和计军屯组的水杉（Ｍｅｔａｓｅｑｕｏｉａ Ｍｉｋｉ）为研究对象,对其雌球果、雄球花枝和营养枝叶的形态、叶表皮和雄球花苞片表皮的结构进行了研究分析,并与Ｍ．ｇｌｙｐｔｏｓｔｒｏｂｏｉｄｅｓ,Ｍ．ｏｃｃｉｄｅｎｔａｌｉｓ,Ｍ．ｍｉｌｌｅｒｉ的性状进行比较,认定其属于Ｍ．ｏｃｃｉｄｅｎｔａｌｉｓ。并没得Ｍ．ｇｌｙｐｔｏｓｔｒｏｂｏｉｄｅｓ和抚顺水杉叶下表皮气孔分布区内的平均气     

云南鱼动物群在广西发现的意义

广西横县六景,泥盆纪地层发育,层次清晰,并产有丰富的无脊椎动物化石。1966年以来,王钰等在该地做过详细的地层古生物工作(王钰,1956;王钰等,1964),创立了那高岭组,用以代表广西早泥盆世晚期的海相沉积,取代了“四排组”,对其上覆的郁江组进行了详细分层。因此,六景便成了我国中泥盆世海相地层的标准地点,创立的那高岭组也广为地质界所引用。紧伏于那高岭组下面的莲花山砂岩,是代表广西早泥盆世早期的陆相沉积,因一直缺乏古生物学方面的可靠证据,故其时代只是按其与上覆下伏地层的关系,归属于早泥盆世早期。1973年4月,笔者与范贵忠同志在广西野外工作期间,于横县六景霞义岭南坡的莲     

河南郑州三李西沟更新世的几种腹足类化石

报道河南郑州三李西沟更新世马兰组、潞王坟组的腹足类化石４种：Ｐｈｙｓａａｓｓｕｔｕｒａｌｉｓｓｐ．ｎｏｖ，Ｉｎｄｏｐｌａｎｏｒｂｉｓｅｘｕｓｔｕｓ（Ｄｅｓｈａｙｅｓ），Ｃａｔｈａｉｃａ（Ｐｌｉｏｃａｔｈａｉｃａ）ｒｉｃｈｔｈｏｆｅｎｉ（Ｍａｒｔｅｎ），Ｃ．（Ｅｕｃａｔｈａｉｃａ）ｆａｓｃｉｏｌａ（Ｄｒａｐａｒｎａｕｄ）。认为潞王坟组沉积时的水域可能比马兰组沉积时广宽，其时代归入早更新世，沉积环境与现代相似，气候比现代温暖。     

Apports de la palynologie a la connaissance du Pliocène du Roussillon (sud de la France)

The present study illustrates clearly how pollen analysis may be applied to stratigraphy from a botanical point of view. Within a chronologically reliable frame (Middle Pliocene for the marine deposits on the basis of Foraminifera record; two subzones for continental deposits on the basis of Mammals record: Hautimagne for Terrats fauna, Sète for Serrat-d'en-Vacquer fauna), palynology provides a good stratigraphical boundary: the extinction of the Taxodiaceae. In a remblayage area, it is established that a continental level is not necessarily younger than a marine one unless they are superposed. Many profiles are replaced according to the «progradation of the pliocene gulf of Roussillon. The boundary between marine and continental deposits cuts through the chronological line of the Taxodiaceae extinction. The flora investigated (93 taxa) is the first known for the Pliocene of this area. The extinction of the Taxodiaceae in southern France has a climatic cause: the setting in of a mediterranean rhythm (dry summers). This extinction is much older than the one which took place in Italy (Tiberian boundary) and in the Netherlands (Reuverian-Pretiglian boundary).     

A Wuchiapingian (Late Permian) brachiopod fauna from an exotic block in the Indus–Tsangpo suture zone, southern Tibet, and its palaeobiogeographical and tectonic implications

A brachiopod fauna including 19 species of 17 genera from an exotic block in the Indus–Tsangpo suture zone in southern Tibet is described and illustrated. The brachiopod fauna is dominated by Martinia elegans and two new taxa: Jinomarginifera lhazeensis gen. et sp. nov. and Zhejiangospirifer giganteus sp. nov. The fauna is closely comparable with those from the middle and upper parts of the Wargal Formation and the Chhidru Formation in the Salt Range of Pakistan, the Chitichun Limestone in southern Tibet, and the Basleo area of West Timor, and these correlations suggest a Wuchiapingian age. The fauna exhibits substantial links with both peri–Gondwanan and Cathaysian faunas, which may imply that it is a seamount biota originally located in the southern margin of the Neotethys during the Late Permian, and was later (in the early Cenozoic) displaced and became sandwiched into younger marine deposits in the collision process between India and Eurasia.     

A new ammonoid fauna from the Carnian (Upper Triassic) Kasimlar Formation of the Taurus Mountains (Anatolia,Turkey)

We describe a new ammonoid fauna from the Taurus Mountains of southern Turkey. The Carnian ammonoid fauna from A?a?iyaylabel is presented for the first time. Ammonoids were obtained from limestone to marl beds of an approximately 35‐m‐thick section, which presents the rare opportunity to investigate ammonoid faunas across the Lower–Upper Carnian boundary. Intense sampling near the village of A?a?iyaylabel led to the recognition of a new Lower Carnian (Julian 2) to Upper Carnian (Tuvalian 1) ammonoid fauna from the Kasimlar Formation. The genus Kasimlarceltites gen. nov. is reported for the first time from the Taurus Mountains, which represents the main faunal element and occurs as huge mass occurrence (n ? 1 million). Kasimlarceltites krystyni gen. et sp. nov., Klipsteinia disciformis sp. nov. and Anasirenites crassicrenulatus sp. nov. occur within the Lower Carnian Carbonate member (Units A–B) of the Kasimlar Formation from the Taurus Platform Units. Ammonoids described from the marls of the Tuvalian Marlstone member were deposited during a major, Tethyan‐wide climate crisis – the so‐called Carnian crisis – characterized by a demise of carbonate platforms. Based on the biostratigraphic relevance of certain ammonoid taxa described herein, the age of the analysed parts of the Kasimlar Formation is Julian 2 to Tuvalian 1. The discovery of the new ammonoid assemblages from A?a?iyaylabel substantiates the significance of Upper Triassic faunas within the Taurus Mountains and facilitates the correlation with faunal assemblages from other regions in the Tethyan Realm. The ammonoid fauna and facies indicate a general deepening from open‐platform margins, over deeper shelf settings down to an open marine‐influenced basinal environment. The tentative habitat for Kasimlarceltites gen. nov. is a shallow platform environment to upper mid‐ramp.     

Conodonts from the Permian Jisu Honguer (Zhesi) Formation of Inner Mongolia, China

The Jisu Honguer Formation (“Zhesi Formation”) is a North China marine carbonate unit of Permian age containing a mixed fauna of Tethyan, Boreal and endemic elements. The age of the Jisu Honguer Formation has been thought to range from Artinskian to Kazanian based on previous studies using mostly benthic macrofossils. A typical Mesogondolella aserrata conodont fauna is reported from the lower part of the upper member of the Jisu Honguer Formation in the Ulanqub District, Zhesi area, of northern China. The fauna indicates a Middle Permian (Guadalupian) age, most likely late Wordian to early Capitanian, for the strata yielding conodonts. The whole Jisu Honguer Formation could be assigned to the Wordian to early Capitanian age. The overlying Yihewusu Formation is probably of Capitanian age. There are no Wuchiapingian marine deposits in the Zhesi area. As characteristic of the open sea Guadalupian conodont faunas of the Tethys, smooth Mesogondolella dominate the fauna. The view that all Tethyan Guadalupian conodont faunas consist exclusively of serrated Mesogondolella cannot be confirmed. Three new species are described: Mesogondolella neoprolongata C. - y. Wang, Mesogondolella mandulaensis C. - y. Wang and Wardlawella jisuensis C. - y. Wang.     

Une faune de petits mammiferes d'age turolien moyen(Miocene superieur) a Cucuron (Vaucluse); donnees nouvelles sur le genre Stephanomys (Rodentia) et consequences stratigraphiques

A small mammal fauna, including rodents and a new species of Murid, Stephanomys stadii n. sp., has been found in a continental formation underlying the deposits with the famous big mammal fauna of Mont Luberon. This fauna of small mammals is a little younger than the fauna of Los Mansuetos (Spain), so, the Pikermian fauna of Mont Luberon, which is said to be of the same age as the fauna of Pikermi is younger than the fauna of big and small mammals of Los Mansuetos.     

Pliocene coastal palaeomorphology and ostracod faunas of the Bass Strait hinterland,southeast Australia

Early to late Pliocene sedimentary strata present across the northern Bass Strait hinterland, southeastern Australia yield extensive fossil proxy data relevant to the interpretation of high sea level coastal palaeomorphology. Within the Pliocene Whalers Bluff Formation exposed in coastal cliffs near the township of Portland, Victoria, marine microfossil faunas delineate two broad cycles of deposition. Both these sedimentary cycles are bound below by unconformity surfaces. Within the lower sedimentary cycle, a basal stress-tolerant (low diversity) marginal marine microfossil fauna devoid of ostracods and suggestive of bottom-water hypoxia, is succeeded by a diverse shallow marine ostracod fauna dominated by stenohaline species indicative of a sheltered (but open) oceanic embayment. This lower sedimentary cycle has an early Pliocene (Zanclean) age. Equivalent shallow marine (e.g. coastal embayment) deposits occur broadly across the coastal hinterland of southeastern Australia—reflecting the generally higher global sea levels of this time. The upper cycle in the cliff exposures at Portland is late Pliocene (Piacenzian) in age. Equivalent deposits across the Bass Strait hinterland are restricted to former incised river valley settings. Euryhaline estuarine/coastal lagoon Ostracoda are present throughout the upper cycle in the Portland cliffs. These are associated with a low diversity microfauna at the base of the upper cycle and a high diversity microfauna towards the top of the cycle. Early Pliocene coastal marine deposits can be distinguished from late Pliocene coastal marine deposits across the northern Bass Strait hinterland on the basis of the presence or absence of certain open marine (‘stenohaline’) ostracod species.     

Le Miocène du Val des Verrières et du Bief des Lavaux(Jura central,Haute-Chaîne): Événements paléobiogéographiques et géodynamiques

The faunas collected in the Miocene of the Centralpart of the Jura High-Range near Pontarlier have allowed to attribute a Burdigalien age at the marine molass and Upper Burdigalien age at the overlying lacustrine deposits. The marine faunas are varied and show very clearly sea-ways from the rhodanoprovencal area. The age of the continental faunas prove that the sea recedes as soon as the end of Lower Miocene, showing the beginning of the emersion of the High-Range is an earliest event than hitherto believed.     

La Grotte des Félins, site paléolithique du Pléistocène supérieur à Dar Bouazza (Maroc)

In the continental sediments filling a cave that developed in Middle Pleistocene deposits near Casablanca, Morocco, a very rich mammal fauna from the last climatic cycle was discovered. It was associated with a Middle Palaeolithic poor and atypical lithic assemblage manufactured on blocks and pebbles. The lower fossiliferous layer contained abundant carbonized remains of felids. Unfortunately, the site was destroyed by quarrying before adequate excavations could be carried out.     

Les rongeurs du miocène inférieur en Bas,Languedoc et les corrélations entre échelles stratigraphiques marine et continentale

The discovery of continental interstratified fossiliferous layers within the lower Miocene marine deposits of Bas Languedoc and the rather unexpected occurrence of rodents within the marine deposits of the same period enables us to refine the mammalian biochronological scale, but above all enables us to establish correlations between the latter and the marine stratigraphic scale. Thus the standard mammalian level of Paulhiac is correlated to the «formation bioclastique de Carry-le-Rouet. As for the standard level of Laugnac it might correspond to the marine Burdigalian whereas it is traditionally allocated to the Aquitanian.The abundance of rodents has allowed to complete our knowledge of still imperfectly known faunas and to formulate new data concerning some evolutive lineages of Cricetid, Eomyid and Glirid rodents.     

Late Miocene continental biota in Northeastern Patagonia (Península Valdés, Chubut, Argentina)

A new vertebrate faunal assemblage was recently discovered from the uppermost part of the late Miocene Puerto Madryn Formation. These deposits crop out along the southwestern coast of the Península Valdés area near Punta Delgada (Chubut Province, Argentina). The exhumed vertebrate fauna includes a range of fish, bird and mammal taxa, of which the latter are most varied and abundant. The new findings represent the first record of continental fossil vertebrates in the Puerto Madryn Formation and this is the first assemblage of late Miocene continental vertebrates recorded to the south of Río Negro Province. It also includes the southernmost record of Hydrochoeridae rodents, Dendrocygninae birds and Loricariidae fishes. The mammals suggest that the fossil-bearing sediments are Huayquerian in age. The climate during the accumulation of late Miocene deposits in this region is inferred to have been warmer and seasonally drier than that of today.