辽西北票地区义县组古气候环境标志及其意义

野外地质调查及综合研究表明，包含中华龙鸟、被子植物等珍稀化石的热河生物群的主要赋存层位为义县组二段湖相沉积岩层。对产于不同地点沉积层中的植物、孢粉化石以及木化石进行了总结研究，分析了它们所反映的古气候环境，认为义县组沉积时期存在大量的喜温湿植物，总体指示温暖湿润的生存环境。同时，一些旱生的买麻藤类植物的普遍存在、本内苏铁类的膜质叶以及松柏类的鳞状叶等的特征反映了存在季节性干旱、半干旱气候的可能性。这种气候状况的出现可能与火山活动有关。     

辽西义县组蝾螈类化石新发现

在辽西葫芦岛市附近的早白垩世义县组地层中发现1处新的蝾螈化石点。新台门一带出露的湖相沉积地层主要是一套灰绿色安山岩与紫色泥质粉沙岩的互层。该层中除了产蝾螈化石外，还有诸如Ephemeropsis，Eosestheria，Liaoningocladus等其他动植物化石。过去发现的Liaoxitriton化石点是在同一地区比新化石层稍高的层位中发现的。该类蝾螈化石曾报道产于早白垩世的九佛堂组，但是新近的野外调查表明，该化石点所在层位也属义县组。     

A Possible Long-tailed Bird with a Pygostyle from the Late Mesozoic Yixian Formation, Western Liaoning, China

AbstractAn incomplete caudal vertebral series (IVPP Vl1309) from the Yixian Formation of late MesozoicJianshangou area of Beipiao, western Liaoning Province, may represent a new bird. The tail is composed of at least 12 free caudal vertebrae and the most distal 5 caudal vertebrae co-ossified into a pygostyle. The pygostyle is plate-like and slightly curved dorsally. The anterior free caudals are amphiplatyan. The anterior caudal surfaces of the last three free caudals are concave, but their posterior articular surfaces are convex. The pygostyle is regarded as the first appeared flight apparatus during the evolutionary process from Archaeopteryx to neornithes. The pygostyle appeared in most early fossil birds and almost all the modem birds. Although their morphologies are different, they are basically formed by at least four last caudal vertebrae. The specimen V11309 is regarded as a bird rather than a non-avian theropod dinosaur based on the following characters: short caudal vertebrae, numerous pits present on the surfaces of the centra and, a foramen present between the basal part of the fused neural spines, which is similar to that of Struthio camelus. The discoveries of pygostyles from the therizinosauroids and oviraptorosaurs may provide strong evidence for supporting the origin of birds from small theropod dinosaurs. The structure of the pygostyle in specimen Vl1309 is different from those of Beipiaosaurus (Therizinosauroid) and Nomingia (oviraptorosaur). The most parsimonious interpretation is that these pygostyle-like structures are independently acquired by Beipiaosaurus and Nomingia during their evolutionary process.     

SHRIMP Geochronology of Volcanics of the Zhangjiakou and Yixian Formations, Northern Hebei Province, with a Discussion on the Age of the Xing''anling Group of the Great Hinggan Mountains and Volcanic Strata of the Southeastern Coastal Area of China

A zircon U-Pb geochronological study on the volcanic rocks reveals that both of the Zhangjiakou and Yixian Formations, northern Hebei Province, are of the Early Cretaceous, with ages of 135-130 Ma and 129-120 Ma, respectively. It is pointed out that the ages of sedimentary basins and volcanism in the northern Hebei -western Liaoning area become younger from west to east, i. e. the volcanism of the Luanping Basin commenced at c. 135 Ma, the Luotuo Mount area of the Chengde Basin c. 130 Ma, and western Liaoning c. 128 Ma. With a correlation of geochronological stratigraphy and biostratigraphy, we deduce that the Xing'anling Group, which comprises the Great Hinggan Mountains volcanic rock belt in eastern China, is predominantly of the early-middle Early Cretaceous, while the Jiande and Shimaoshan Groups and their equivalents, which form the volcanic rock belt in the southeastern coast area of China, are of the mid-late Early Cretaceous, and both the Jehol and Jiande Biotas are of the Early Cretaceous, not L     

Discovery of a New Pterosaur in Western Liaoning,China

The pterosaur from the Yixian Formation in Beipiao, Liaoning Province, ischaracterized by the medium-sized individual, short tail, presence of the gastralia, strongforelimbs, radius and ulna longer than wing-metacarpal, extremely narrow and elongatemetatarsals, degenerated and small phalanx V of hindlimb and so on. It must be a new genusand species, Eosipterus yangi gen. et sp. nov., in the early groups of the SuborderPterodactyloidea. This is the first record of pterosaurs found in Liaoning Province. The fossilprovides new evidence for further determining the nature and geological time of the JeholFauna and for studying the palaeogeography and palaeoenvironment.     

易县麦饭石中沸石的发现及其意义

易县麦饭石系黑云母石英二长岩,属新开发的一种食品原料矿产资源。麦饭石主矿物长石的解理、裂隙、空洞中赋存有沸石及其它粘土矿物,构成一种独特的次生显微海绵状结构。按其次生矿物种类、集合体形态和大小、产出方式和部位,划分出叶片状、脉状、斑点状、环带状和囊状等五种类型。次生显微海绵状结构是麦饭石所特有的、区别于一般中酸性火成岩的主要特征,是决定麦饭石的物理化学性质和其健身益寿功效的主要因素,并可作为麦饭石重要的地质判別标志之一。     

New genera and species of bark-gnawing beetles (Coleoptera: Trogossitidae) from the Yixian Formation (Lower Cretaceous) of Western Liaoning,China

Two new genera from the Lower Cretaceous Yixian Formation of Beipiao City, Liaoning Province, northeastern China are described and illustrated. Paracretocateres gen. nov. (type species P. bellus, sp. nov.) and Yixianteres gen. nov. (type species Y. beipiaoensis sp. nov.) are assigned to the subfamily Lophocaterinae based on the state of the procoxae which are not projecting, the transverse procoxal cavities, and the exposed protochantins. The new taxa broaden the diversity of this family and provide further morphological characters for phylogenetic studies of Trogossitidae. They also provide evidence that lophocaterines well-diversified prior to the trogossitines and their biologies may have been similar to extant forms.     

辽宁北部秀水盆地义县组地层划分的地球物理响应特征

通过采用地表地质调查、钻孔岩心编录、地球物理测井、二维地震等多种技术手段,综合运用岩石地层、测井曲线、二维地震和钻井资料标定相结合的研究方法,将以辽法地1井、秀D1井为代表的义县组划分为4个岩性段,即：一段（K₁y¹）基性火山岩段,二段（K₁y²）火山岩夹沉积-火山碎屑岩段,三段（K₁y³）沉积岩段,四段（K₁y⁴）酸性火山岩段.4个岩性段和界面在露头、钻井岩心、测井曲线、地震等资料上的特征明显.重、磁、电剖面联合反演综合解释推断及井震标定后的地震反射特征均表明下白垩统义县组4个岩性段在空间上具有一定的展布特征和分布规律.     

辽西中生代义县旋回强烈火山作用对生物生存环境的双重影响

辽西中生代义县旋回火山作用可以划分成4个亚旋回,每个亚旋回火山喷发都有不等量的火山碎屑物和熔岩形成。火山爆发作用对生物生存环境产生两方面的影响,一方面火山喷发作用形成一定量的H2O、SO2、SO3等硫化物气体,是火山喷发烟雾及火山硫酸盐气溶胶的主要物质成分,由于硫化物气体上升进入大气层而发生氧化反应,形成硫酸盐气溶胶,对太阳产生折射,使生物死亡。H2S、SO2、SO3、HCl和FIF等气体和As、Hg的存在都能造成水体和植物的污染,使生物死亡。另一方面火山作用间歇期为生物提供生存的时间和活动的空间。火山作用停止以后,火山口附近通常形成大量的温泉和较大的湖泊,给生物提供了良好的生存环境,使生物在新的环境下重新繁盛。     

中华鸟龙与孔子鸟类的时代——辽西义县组火山凝灰岩激光~(40)Ar/~(39)Ar年龄测定

利用ＮｄＹＡＧ 激光ＡｒＡｒ 测年法,对产自辽西北票四合屯尖山沟地区义县组底部孔子鸟和中华鸟龙湖相层中火山凝灰岩中的黑云母单晶做了５０ 多次分析, 得出的同位素年龄值为（１４７ ±１．８） Ｍａ , 用ＫＡｒ 法测得孔子鸟化石外面的火山包裹层的结果为（１４７．３ ±３ ．３）Ｍａ ,两者年龄时代相当吻合,同为晚侏罗世晚期（ 晚提唐期） ,比德国始祖鸟层的时代略晚,也与孔子鸟特征和美颌龙类———中华鸟龙指示的地质时代吻合。