义县组

河北省丰宁县北部侏罗系义县组底部首次发现鸟类化石。

Bird fossils were for the first time discovered in the bottom of the Jurassic Yixian Formation in the north of Fengning county , Hebei .

义县组形成于135～120Ma期间，属于早白垩世。

The Yixian formation was formed during the period of 135 to 120 Ma , i.

义县组各种化石木的平均敏感度（MS）在0～0.2间，表明树木总体生长在年降水量或水供应较均匀的环境。

The index of mean sensitivity ( MS ) from various fossil woods is between 0 and 0.2 , as a whole , showing the trees growth under the well environment with annual precipitation or water provided equably in Yixian age .

辽宁西部义县组被子植物花粉的首次发现

First Discovery of Angiospermous Pollen from Yixian Formation in Western Liaoning

辽西义县组蝾螈类化石新发现

New discovery of salamander fossils from the Yixian Formation in western Liaoning

而义县组火山岩岩性主要为一套流纹质火山岩。

Yixian Formation is mainly composed of rhyolitic volcanic rocks .

辽西北票地区义县组地层层序与化石层位

The stratigraphic sequence and fossil-bearing horizon of the Yixian Formation in Western liaoning , china

辽西地区义县组沉积剖面结构分析与对比

The structural analysis and correlation of sedimentary sections of Yixian Formation in western Liaoning Province

稀土元素分特征还反映出，不同的义县组火山-沉积岩层位之间具有相似的物源关系。

The REE pattern also indicates that different beds of Yixian Formation have similar material sources .

描述：中国的义县组产出的化石种类精美绝伦，种类繁多，昆虫、脊椎动物，还有植物。

Description : The Yixian formation of China contains a panoply of exquisitely-preserved insects , vertebrates , and plants .

辽西下白垩统义县组化石木年轮的观察及其意义

Growth rings observation on fossil woods and their implication from Yixian Formation of Lower Cretaceous in western Liaoning Province

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

Discovery of sedimentary tuff beds in basic and intermediate-basic volcanic rocks of Yixian F. in West Liaoning Province and its significance

以《国际地层指南》的多重地层划分观点为基础，建立了一套完整的义县组岩石地层单位。

According to the multiple stratigraphic division of the International Stratigraphic Guide , a complete column of lithostratigraphic units of the Yixian Formation has been erected .

辽西地区早白垩世早期义县组以产出精美的热河生物群而闻名于世，热河生物群研究的每一个重要进展都引起国内外科学家的极大关注。

The Yixian Formation becomes world well-known by fancy Jehol bita fossils , each signify headway of bita research would bring both here and abroad scientists'attention .

根据火山活动特征和区域地层对比，将四合屯地区的义县组地层划分为三个岩性段，指出它们分别是早、中、晚三期火山活动的产物。

Based on the stratum comparison and characteristic study , the Yixain Formation can be classified into three members that were formed by volcanic activities of three periods respectively .

对辽宁西部晚侏罗世义县组中的孢粉植物群进行了系统研究，首次发现了目前为止世界上最古老的被子植物花粉化石。

This paper reports fossil pollen collected recently from the Upper Jurassic Yixian Formation of western Liaoning Province , and first demonstrates the oldest known angiospermous pollen in the world .

辽西凌源地区张家口组是否存在及其与义县组之间关系的问题一直存在争议。

The problems of whether the Zhangjiakou Formation exists in the Lingyuan area , western Liaoning , and its relationships with the Yixian Formation , has long been in dispute .

运用元素生物地球化学异常对比，作者进一步确认义县组化石与其围岩在有毒、有害元素异常方面存在的一定的耦合关系：其有毒有害元素含量均呈现一定的高异常。

The special element comparison of biochemical abnormal indicates that the fossils of Yixian Formation couple with its fossil-bearing beds at the respect of the high level toxic element abnormal .

辽宁凌源及相邻内蒙古南部宁城地区义县组发现多个重要脊椎动物化石地点，通过岩石地层、脊椎动物生物地层和同位素年代地层对比，建立了该地区义县组地层层序。

Summary : Several important vertebrate fossil localities have been discovered from the Early Cretaceous deposits in Lingyuan , western Liaoning Province and neighboring Ningcheng areas of southern Nei Mongol .

该地区义县组顶部层位的年龄，也是辽西乃至中国东北地区白垩纪大规模岩浆活动结束的年龄。

The age of the top of the Yixian Formation in the area is also a very important ending age of large-scale Cretaceous magmatism in western Liaoning and even Northeast China .

辽宁北票地区义县组是一套中生代陆相火山沉积岩系，主要由中-基性火山熔岩、火山碎屑岩及陆相沉积岩构成。

The Yixian Formation in the Beipiao area , Liaoning Province , consists of a series of volcanic-sedimentary rocks , including basic and intermediate-basic volcanic lava , pyroclasts and terrestrial sedimentary rocks .

野外工作表明辽西地区义县组碳酸盐岩夹层的发育向盆地的南侧有层数增多碳酸盐含量增加的趋势。

The field works indicate that the development of the carbonate interlayers has the tendency of increase in terms of the layers and carbonate content to the southern direction of the basin .

野外填图证实，四合屯及其周边地区热河生物群化石主要产于义县组下部的沉凝灰岩和中部的内陆湖泊相沉积岩之中。

Based on the field mapping , we recognized that " Jehol Biota " fossils occurred mainly in tuffite of the lower part and inner lake sedimentary beds of the middle part of Yixian F.

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。

Under these fossils beds and above polygenic conglomerate beds , 4 sedimentary tuff beds are discovered in the basic , intermediate basic volcanic rocks , which are interbeded with the basic , intermediate basic volcanic rocks , and mainly consisted of sedimentary tuff or pebble tuffaceous siltstone .

辽西北票&义县地区义县组顶部层位的年龄及其意义

The age of the top of the Yixian Formation in the Beipiao-Yixian area , western Liaoning , and its importance

与阜新盆地南部义县附近的义县组火山岩喷发的时代大致相当。

They are almost cotemporary with the volcanic eruptions of Yixian Formation near Yi County in the south of Fuxin Basin .