辽宁北票地区义县组含鸟化石层沉积环境初探     

和政军  范国清  董国义  李亚平  王瑞信 《国土资源》1997,(3)

北票四合屯地区义县组含鸟化石层沉积形成于火山活动的间歇期。沉积产物以水平纹理泥岩等细碎屑岩为主，普遍含有火山碎屑物质，岩层以流水构造不发育为特征。总体沉积环境主要为滨湖—浅湖，并伴有小规模的阵发性浊流沉积注入。湖盆类型为南东缘发育同沉积断裂，北西侧呈缓坡的半地堑盆地。  相似文献   

The oldest angiosperm—a tricarpous female reproductive fossil from western Liaoning Province, NE China   总被引：2，自引：0，他引：2  

Shuying Duan 《中国科学D辑(英文版)》1998,41(1):14-20

The fossil plant female reproductive organs each with a tricarpous were collected from the Yixian Formation, Chaoyang district, western Liaoning Province. The geological age of the Yixian Formation here is believed to be Late Jurassic, which places this fossil as the oldest angiosperm currently known. Its morphological characters are distinct from other known angiosperm reproductive organs as it has 3 ovaries, each with a terminal style and an apical stigma. 9 such organs compose a cyme. As this morphological arrangement is unique to this plant, a new genus and species has been established, namedChaoyangia liangii gen. et sp. nov. Project supported by the Special Finances of Biological Sciences and Technology, Chinese Academy of Sciences (the special item of the Ministry of Finance of the People’s Republic of China).  相似文献   

辽西中生代含鸟层及上下层位的划分和时代     

李亚平  董国义  范国清 《国土资源》1998,(3)

辽宁西部中生代地层发育,在国内外同期地层研究中占有重要地位。辽西中生代鸟化石的发现,具有重要的科学价值。含鸟层位包括上侏罗统义县组含鸟层和下白垩统九佛堂组含鸟层。现共鉴定出鸟类化石１１个属１４个种,其中义县组鸟化石４个属６个种,地位最为重要。鉴于此,将义县组下部的沉积层划分出来,并建立了四合屯组,该组对寻找鸟类的祖先具有重要的意义。原土城子组一段具有组级岩石地层单位意义称为蒙古营子组。  相似文献   

Brochocolein beetles (Insecta: Coleoptera) from the Lower Cretaceous of northeast China and southern England     

《Cretaceous Research》2013

Lower Cretaceous beetles belonging to the extinct tribe Brochocoleini (Coleoptera: Cupedidae: Ommatinae) are revised and five new species proposed in the extinct Eurasian genus Brochocoleus: Brochocoleus yangshuwanziensis sp. nov. (Yixian Formation, China); Brochocoleus crowsonae sp. nov., Brochocoleus keenani sp. nov., Brochocoleus tobini sp. nov. (Weald Clay Group, UK); and Brochocoleus maximus sp. nov. (Purbeck Limestone Group, UK). New morphological data is provided for Brochocoleus impressus and Brochocoleus sulcatus stat. nov. of which Brochocoleus angustus is considered a synonym (Yixian Fm.). The hindwing venation is described for the first time supporting the basal position of this tribe. A simple key is provided to all Cretaceous species of this presumably xylophagous, warm climate genus.  相似文献   

辽西建昌盆地下白垩统义县组的划分及其介形类化石     

张立君  张立东  场雅军  郭胜哲  王五力  郑月娟  丁秋红  成龙 《地质与资源》2012,21(1):81-92

以要路沟上平房-青石岩、上白庙-罗家沟和小郎家沟-三门店剖面为代表的建昌盆地义县组,自下而上分为5段：第一段主要为砂砾岩（要路沟层）;第二段为砂泥岩、页岩夹凝灰岩,其中包括上白庙层含Cypridea（C.）biventricostata-Yumenia luojiagouensis介形类亚组合带,罗家沟层产介形类Cypridea（C.）luanpingensis-Yumenia unidorsalta-Djungarica camarata亚组合带以及爬行类和鸟类等多门类化石,后狮沟里层以鱼类和介甲类化石为主;第三段岩性是中酸熔岩及其火山碎屑岩;第四段亦称前狮子沟层,以砂页岩为主,夹安山岩,含介形类Yumenia luojiagouensis-Jianchangella dorsicostata亚组合带;第五段为酸性火山岩.上述各层介形类亚组合统归该盆地义县组Cypridea（C.）biventricostata-Yumenia luojiagouensis-Djungarica camarata组合带,其时代属早白垩世早期.文中描述了介形类化石1新属7新种.  相似文献   

辽西地区土城子组-义县组地层划分对比及时代讨论     

张应明  吕晓瑜  侯静  马维  王然  潘四江 《吉林地质》2012,31(2):1-6

本文介绍了辽西中生代土城组、张家口组、义县组地层特征、化石组合。通过岩石地层、生物地层、同位素年代学研究,并在宁城道虎沟地区的张家口组沉积层中采到的化石组合和同位素年龄多数反映时代为晚侏罗纪;义县组生物化石组合和同位素年龄反映时代为早白垩纪。故将侏罗纪与白垩纪界线置于张家口组与义县组之间,同国际年表年代界限（145.5 Ma）相一致。  相似文献   

Evolution and palaeosynecology of the Mesozoic earwigs (Insecta: Dermaptera)     

André Nel  Cédric AriaRomain Garrouste  Alain Waller 《Cretaceous Research》2012,33(1):189-195

Sinoprotodiplatys zhangi gen. et sp. nov. is described from the Lower Cretaceous Yixian Formation in Liaoning Province, near Beipiao City, China. It is one of the most recent representatives of the suborder Archidermaptera. The classification and synonymies among the archidermapteran families are reassessed. The palaeosynecological evolution of the Mesozoic earwigs is analysed using the new tool of the ‘Wagner Parsimony using Morphological Characters’ method (‘WAPUM’), suggesting that the evolution of the morphology of these insects was very progressive, perhaps owing to their way of life in the soil.  相似文献   

早白垩世义县盆地义县组顶部金刚山层沉积相及其古环境意义     

梁俊红  巩恩普  李永杰 《沉积学报》2012,30(4):689-695

辽西义县盆地内近东西走向的马神庙-刀把地-三百垄-金刚山一带为义县组标准地层剖面出露地,义县组建阶标准地层剖面枣茨山金刚山层为一套古湖盆相沉积组合。野外详细的沉积学和地层学研究将金刚山层自下而上划分为湖缘碎屑浊流相、浅水湖坪相和半深湖相3个沉积亚相。金刚山层下部湖缘碎屑浊流相包括3个粗-细粒序递变沉积韵律。粗粒岩石单元为灰绿色含长石岩屑凝灰质砂砾岩、杂色砾岩、灰白色含砾凝灰岩;细粒岩石单元由灰白色含砾凝灰岩、灰绿色致密凝灰岩、质纯膨润土组成。韵律沉积底部粗粒岩石单元为浊流头部沉积产物,其中常形成弥散式正粒序递变层理,细粒岩石单元为浊流体部、尾部逐渐稀释的沉积结果,其中常发育水平层理。中部浅水湖坪相沉积由5个膨润土化粉砂岩（质纯膨润土或页岩）-泥灰岩（含方解石细脉灰岩）沉积韵律构成。每一湖坪相的碳酸盐岩与下伏火山灰质沉积厚度之比值变化范围为:0.11~0.47,指示湖盆围缘经历了多期次湖坪沉积时间间隔相等的地质规律。金刚山层上部半深湖相沉积为灰白色纸片状页岩-粉砂质页岩组合。金刚山层下部湖缘火山碎屑浊流沉积指示火山喷发物质近源性、火山喷发多期作用的地质演化规律。中部湖坪相的5个膨润土化粉砂岩（质纯膨润土或页岩）-泥灰岩（含方解石细脉灰岩）沉积韵律指示古湖盆水体至少经历了5期变浅过程,在区域性干旱气候影响下,形成湖坪相泥灰岩沉积。湖盆中心相对深水沉积区接受大量细粒悬浮质沉积,形成静水半深湖相沉积。  相似文献   

A New Fossil Hangingfly (Mecoptera: Cimbrophlebiidae) from the Early Cretaceous of China     

WANG Chen  SHIH Chungkun  REN Dong 《《地质学报》英文版》2014,88(1):29-34

A new species, Cimbrophlebia rara sp. nov., in the family Cimbrophlebiidae（Mecoptera） is described and illustrated. This specimen was collected from the Early Cretaceous Yixian Formation at Liutiaogou in Inner Mongolia, China. This is the first record of a cimbrophlebiid from the Jehol biota. A key to all species of Cimbrophlebia is given. A preliminary review of published taxa data indicates that from the Middle Jurassic to the Early Cretaceous, Mecoptera became less diverse and less abundant in northeastern China at familiar level（from 11 to 6）, generic level（from 32 to 8） and specific level（from 44 to 14）.  相似文献   

New Fossil Procercopidae (Hemiptera, Cicadomorpha) from the Early Cretaceous of Northeastern China     

HU Haijing  YAO Yunzhi  REN Dong 《《地质学报》英文版》2014,88(3):725-729

A new fossil species,Anthoscytina macula sp.nov.,of the family Procercopidae is described from the Early Cretaceous Yixian Formation in Huangbanjigou,Chaomidian Village,Beipiao City,Liaoning Province,China.A key to the species of the genus Anthoscytina Hong,1983 is provided.The diagnosis of the genus is revised.  相似文献