Solenites (Czekanowskiales) from the Late Mesozoic Jehol Biota of Southeastern Jilin, China and its Paleoclimatic Implications     

LI Yunfeng  an  SUN Chunlin  LI Tao  NA Yuling  CHEN Yuejun  XING Dehe 《《地质学报》英文版》2015,89(4):1088-1102

Situated at the easternmost area of the Late Mesozoic Jehol Biota, China, abundant fossils, including invertebrates, vertebrates and plants, were collected from the Early Cretaceous Yingzuilazi Formation of the Baishan Basin, southeastern Jilin. The faunal remains from this formation distinctly belong to the Early Cretaceous Lycoptera–Ephemeropsis–Eosestheria assemblage of the Jehol Biota. Based on the gross leaf morphology and epidermal structures, two new species and one indeterminate species of genus Solenites(Czekanowskiales), S. baishanensis sp. nov., S. gracilis sp. nov. and S. sp. are described in this paper. This is the first fossil plant of Czekanowskiales reported from this new fossil locality of the easternmost area of the Late Mesozoic Jehol Biota, China. The new discovery contributes to improve our knowledge for understanding of leaf morphology, epidermal characters and diversity of this genus during the Early Cretaceous time, and extends geologic and geographic distribution of Solenites in northern China and Eurasia. Along with consideration of associated plant and faunal assemblages and sedimentology, we suggest that the regional climate was warm and moderately humid with seasonal temperature and precipitation variations in warm–temperate zone during the Early Cretaceous.  相似文献   

辽西义县组基性、中基性火山岩内沉凝灰岩层的发现及其意义     

陈树旺 《国土资源》2001,18(1)

义县组岩性以基性、中基性火山岩、火山碎屑岩为主，局部发育有富含“热河生物群”化石的沉积层。在这些沉积层之下、义县组复成分底砾岩之上，发现有 4个沉凝灰岩层，与基性、中基性火山岩呈互层状产出，其岩性以沉凝灰岩或含砾凝灰质粉砂岩为主。这些凝灰岩层厚度虽小，但分布较广泛，走向延伸稳定。根据辽西地区中生代火山岩活动的基本规律，沉凝灰岩层与基性、中基性火山岩的空间展布特征及野外地质综合研究将义县组早期火山活动划分出 5个火山作用旋回，并确认四合屯、黄半吉沟、尖山沟、以及上园、大康堡、河夹心等地富含“热河生物群”化石的沉积层均属于同一火山旋回（第五旋回）的产物。这一发现极大地丰富了辽西地区中生代陆相盆地火山—沉积作用的研究内容，并将促进火山活动与生物灭绝事件方面的研究工作。  相似文献   

辽西热河生物群演化的主要地质背景     

张立军 《世界地质》2013,32(3):447-462

本文结合近年来辽宁省化石资源调查成果,对辽西热河生物群的分布和组成进行了总结,进一步明确了以辽西各主要盆地化石群为代表的相对连续的化石群序列; 运用宏观进化理论和地理隔离等观点分析了辽西热河生物群脊椎动物的演化,并对其主要地质背景进行了总结。对辽西热河生物群脊椎动物的演化,可识别出辐射、趋同和复式进化等类型; 在义县组阶段存在着由于地理隔离而发生的成种事件,九佛堂组阶段翼龙和鸟类的辐射可能与由于食性分化而导致的生态隔离有关; 热河生物群的演替很可能是打破地理隔离后部分物种的绝灭、一些本地起源物种的向外迁移和外来物种的侵入、部分类群的辐射和复式进化共同作用的结果,与其所处的主要地质背景在时空上协同一致。综合分析认为,义县组火山岩已经“穿时”,在其晚期火山活动初始,已进入九佛堂组阶段。  相似文献   

贵州金沙长岩沟寒武系牛蹄塘组生物群组成特征     

王平丽  赵元龙  李增学  杨兴莲  伍孟银  张培兴 《地质通报》2013,32(5):760-766

贵州金沙长岩沟牛蹄塘组生物群化石丰富,共计25属,以海绵动物为主,另有节肢动物及藻类两大门类化石代表.海绵动物以普通海绵为主,计8属,占整个海绵动物属的57％;六射海绵5属,占海绵的36％,另有纲、目及科未定1属.节肢动物8属中高肌虫占优势,计有5属;大型双壳节肢动物2属,三叶虫仅1属.藻类共计3属.与遵义牛蹄塘生物群相比,两地均以普通海绵为主,金沙长岩沟牛蹄塘生物群海绵更为丰富,与遵义黑沙坡的海绵组成有差异.金沙长岩沟节肢动物中三叶虫少,仅1属,但高肌虫丰富,达5属,而遵义黑沙坡只有2属高肌虫,三叶虫则达4属.遵义和金沙牛蹄塘组生物群分别有藻类属4个和3个,共有属2个.两地同一生物群组成的差异,说明同处扬子浅水区的金沙长岩沟及遵义黑沙坡沉积环境可能有所差异,因而组成面貌也有差异.两地牛蹄塘生物群均具有显著的澄江生物群色彩.  相似文献   

Jianshangou Bed of the Yixian Formation in West Liaoning,China   总被引：4，自引：0，他引：4  

CHEN Peiji    WANG Qifei  ZHANG Haichun    CAO Meizhen  LI Wenben  WU Shunqing & SHEN Yanbin . Nanjing Institute of Geology  Palaeontolgoy  Chinese Academy of Sciences  Nanjing  China  . State Key Laboratory of Palaeobiology  Stratigraphy  Nanjing  China 《中国科学D辑(英文版)》2005,48(3):298-312

The Jianshangou fossil locality was first found byChang Zhenglu and his colleagures in 1962, now thearea of Jianshangou, Sihetun and Huangbanjigou be-comes famous all over the world for its yielding feath-ered dinosaurs, Confuciusornis and Archaefructus. Thename of Jianshangou Bed was proposed by the firstauthor of present paper as an informal suggesting unitduring the research on Jehol fossils of western Liaon-ing in 1963 and 1964. The unit was named then asJianshan Bed[1], indicating th…  相似文献   

关岭生物群的生活环境   总被引：4，自引：2，他引：4  

王尚彦  王宁 《贵州地质》2002,19(4):240-241

产于贵州省关岭县新铺乡附近晚三叠世早期地层瓦窑组下部的关岭生物群科学意义重大、观赏性极好、生活环境独特。岩相古地理分析其生活环境为海湾。沉积和古生态特征显示生活环境水体平静。  相似文献   

瓮安生物群中海绵化石的新证据   总被引：5，自引：0，他引：5  

曹芳  朱士兴 《地质学报》2001,75(3):289-291,T001,T002

近年来笔者依据现存的瓮安生物群中一些海绵及动物胚胎化石标本的研究，对那些可能的球形海绵体及有争议的海绵幼虫标本进行了简略的评述。本文提供的保存完好的具单轴骨针的球形海绵体化石及可能的海绵幼虫标本，对于陡山沱期出现海绵动物的推测提出了新的证据。  相似文献   

三尾拟蜉蝣在中国热河生物群可能并不存在   总被引：2，自引：0，他引：2  

黄建东  任东 《地质论评》2008,54(5):602-608

热河生物群是中生代晚期分布在东亚地区尤其是中国辽西、冀北地区的一个非常繁荣的陆相化石群,东方叶肢介（Eosestheria）、“三尾拟蜉蝣（Ephemeropsis trisetalis）”和狼鳍鱼（Lycoptera）是它的3个典型代表成员。最近对采自义县组的上百块与三尾拟蜉蝣较为相似的成虫标本研究,发现上述成虫标本与三尾拟蜉蝣存在比较明显的区别,建立了美丽蜉蝣属及其两个种,并认为三尾拟蜉蝣可能仅分布在俄罗斯西伯利亚的外贝加尔和蒙古,在中国热河生物群并不存在。这一发现对有关热河生物群的古地理分布、地层划分和对比以及古水系等问题有重要的参考意义。  相似文献   

New Localities and Palaeoscolecid Worms from the Cambrian (Stage 4, Series 2) Guanshan Biota in Kunming, Yunnan, South China     

LIU Jianni  HAN Jian  LI Jinshu  WU Yichen  PENG Jie  QI Nan  YANG Yiyao  LI Juan 《《地质学报》英文版》2016,90(6):1939-1945

The Guanshan Biota from the Cambrian Stage 4 Wulongqing Formation is a typical Burgess-shale type Lagerst?tte that had witnessed the Cambrian explosion. Here we report two new localities of the Guanshan Biota, which is located at Baimei village, south of Kunming and Xinglong village, Wuding County, Yunnan Province respectively. Both localities produce soft-body fossils and several new taxa, e.g. a new species of palaeoscolecidans (Palaeoscolex xinglongensis sp. nov.) reported herein. The comparative study of the new species with similar form not only indicates that there is a diversification of palaeoscolecid species in Guanshan Biota, but also strengthens the ties between the older Chengjiang Biota and the younger Kaili Biota (and also the coeval Burgess Shale community). Three paleoecological features, including high diversity, little disparity and richness of palaeoscolecid worms, are summarized as a case study to represent the differences between Guanshan and Chengjiang Biota.  相似文献   

城子河组的新材料及其地层意义     

郑少林  梁子华 《地层学杂志》1995,19(1):1-8,T001

黑龙江省密山县金沙农场北部鹿山地区被钻孔揭示的城子河组剖面产有海相一半成水相双壳类、沟鞭藻，孢子花粉及植物化石，这些新材料进一步证明城子河组的时代应属早白垩世早中期，从而为侏罗～白垩系界线划分及鸡西群与龙爪沟群对比提供了新的生物地层依据。  相似文献