河南西峡白垩纪地层和蛋化石   总被引：11，自引：3，他引：8  

方晓思  张志军  庞其清  李佩贤  韩迎建  谢宏亮  闫荣浩  庞丰久  吕景禄  程政武 《地球学报》2007,28(2):123-142

本文在对西峡地区恐龙蛋化石分布进行全面评价同时,还首次报道了鳄类蛋化石、鸟类蛋化石、赵营组的无脊椎动物化石,这些新发现不仅丰富了西峡地区生物群面貌,也揭示了伏牛山南麓白垩纪构造盆地特点.  相似文献   

西峡盆地新类型恐龙蛋化石的发现   总被引：1，自引：0，他引：1  

王德有  周世全 《河南国土资源》1995,(4)

本文首次报道广西峡盆地的两类新类型的恐龙蛋化石：西峡长圆柱蛋（新属、新种）Ｌｏｎ－ｇｉｔｅｒｅｓｏｏｌｉｔｈｕｓｘｉｘｉａｅｎｓｉｓ（ｇｅｎ．ｅｔｓｐ．ｎｏｖ．）．戈壁棱柱形蛋ＰｒｉｓｍａｔｏｏｌｉｔｈｕｓｇｅｂｉｅｎｓｉｓＺｈａｏａｎｄＬｉ１９９３。它们分别产于高沟组的中、下部和上部，其时代均为晚白垩世。  相似文献   

塔里木盆地吐依洛克组发现沟鞭藻化石   总被引：1，自引：0，他引：1  

郭宪璞  王大宁  丁孝忠  叶留生 《地质论评》2008,54(6):814-820

新疆塔里木盆地西南缘的吐依洛克组化石罕见,以前依据岩性将其定为晚白垩世。郝诒纯等（2001）、郭宪璞（1990）根据在该组所产的有孔虫、介形虫等化石组合,将该组时代划为古新世,并将白垩系与古近系界线划在该组与依格孜牙组之间。本次在该组命名剖面—吐依洛克剖面上部岩性段发现了20余种沟鞭藻化石,增添了新的古生物门类和生物地层材料,这是带有白垩纪与古近纪过渡色彩的沟鞭藻化石组合,其所反映的古环境是温暖的近岸滨海—浅海环境。  相似文献   

主题公园周边土地利用动态变化及其驱动机制——以常州中华恐龙园为例   总被引：1，自引：0，他引：1  

汤傅佳  黄震方  陈晓艳 《地域研究与开发》2016,(5)

以常州中华恐龙园为研究对象,选取该处土地利用重要变化节点2000—2010年为研究时段,利用GIS/RS手段,从土地利用变化速度、土地利用扩展强度和土地利用转移方向等方面对中华恐龙园周边土地利用变化时空特征进行定量分析。结果显示:2000—2010年中华恐龙园周边10 km缓冲区内各种土地利用类型均有较大变化,随着缓冲区范围的扩大,其建设用地变化速率变缓,相比而言,2005—2010年间的变化强度和规模比2000—2005年间大。研究区内建设用地变化与中华恐龙园的发展水平呈显著相关。依托区域形象、人文环境、人口集聚等保障因素,在政府金融、财税、土地等政策的引导下和各项经济因素的推动下,主题公园周边的土地实现了功能转变、价值提升且土地利用方式朝着集约化的方向发展。  相似文献   

Dentary groove morphology does not distinguish ‘Nanotyrannus’ as a valid taxon of tyrannosauroid dinosaur. Comment on: “Distribution of the dentary groove of theropod dinosaurs: Implications for theropod phylogeny and the validity of the genus Nanotyrannus Bakker et al., 1988”     

《Cretaceous Research》2016

There has been considerable debate about whether the controversial tyrannosauroid dinosaur ‘Nanotyrannus lancensis’ from the uppermost Cretaceous of North America is a valid taxon or a juvenile of the contemporaneous Tyrannosaurus rex. In a recent Cretaceous Research article, Schmerge and Rothschild (2016) brought a new piece of evidence to this discussion: the morphology of the dentary groove, a depression on the lateral surface of the dentary that houses neurovascular foramina. They argued that an alleged ‘Nanotyrannus’ specimen, which possesses a groove, cannot be referable to Tyrannosaurus rex, which they considered as lacking the groove, and they hypothesized that ‘Nanotyrannus’ is closely related to albertosaurine tyrannosauroids, which also are said to possess the groove. However, we show that the groove is a widespread feature of tyrannosauroids that is present in T. rex and many other specimens, and that it is an ontogenetically variable feature that changes from a sharp, deeply-impressed groove to a shallower sulcus as an individual matures. As a result, the presence or absence of a dentary groove does not clarify the validity of ‘Nanotyrannus’ or its phylogenetic position among tyrannosauroids. We consider it most parsimonious that ‘Nanotyrannus’ specimens belong to juvenile T. rex.  相似文献   

Dinosaur eggshell assemblage from Japan reveals unknown diversity of small theropods     

《Cretaceous Research》2016

The Lower Cretaceous (Albian) Sasayama Group in the Hyogo Prefecture of southwestern Japan has yielded various vertebrate fossils, including skeletal remains of dinosaurs, anurans, lizards, and mammals, and recently eggshell fragments. Here we report on numerous fossil eggshells from the bone-bearing Kamitaki locality in Tamba City, which represents a diverse dinosaur eggshell assemblage. Of the more than 90 eggshell fragments recovered, five different types were identified, including eggshells that likely belong to a variety of theropods (Nipponoolithus ramosus oogen. et oosp. nov., Elongatoolithus sp., Prismatoolithus sp., and Prismatoolithidae indet.) and at least one ornithopod (Spheroolithus sp.). All eggshells are relatively thin, and a new derived estimation method correlating egg mass with eggshell thickness indicates that they are among the smallest (28–135 g) theropod eggs known, likely laid by small bodied forms. The eggshell assemblage from this locality suggests that a diverse small dinosaur fauna, consisting primarily of theropods, nested in the region, a diversity yet to be evidenced from skeletal remains in Japan.  相似文献   

多金属结核海底照片图象处理结果的地质解释   总被引：1，自引：0，他引：1  

朱克超  王公念 《海洋地质与第四纪地质》1997,17(3):53-62

海底照片微机处理系统（ＮＩＲＳ）是多金属结核海底照片的处理系统，该系统可高效率地处理大量的海底照片，提高了照片的清晰度，获取了更多的地质信息，根据ＤＹ８５０１及ＤＹ８５－３航次照片处理结果，划盼出五咱照片类型，讨论照片处理质量的评价方法，在海氏分布状态，用照片估算丰度评价校正抓斗采样丰度的方法。ＤＹ８５－３航次全部单次照片的处理结果表明，在抓斗采样丰度中，埋藏型结核所占的比例很小；抓斗采样丰度受诸  相似文献   

Preservation of dinosaur tracks induced by microbial mats in the Sousa Basin (Lower Cretaceous), Brazil     

《Cretaceous Research》2013

Dinosaur footprints and tracks in the Sousa Basin (Lower Cretaceous, Brazil) occur in at least 37 localities, in distinct stratigraphic positions. Footprints are rare in the Antenor Navarro (lower) and Rio Piranhas (upper) formations, where lithofacies analyses point to sedimentation in ancient alluvial fan to fluvial braided palaeoenvironments. In the Sousa Formation, the generally finer grain sized sediments rendered them more suitable for footprint preservation, where lithofacies analyses point to sedimentation in warm, small/shallow and temporary lakes, swamps and meandering fluvial palaeoenvironments. Microbially induced sedimentary structures are observed in many of the fine-grained lithofacies where dinosaur tracks are also found, and the large number of these tracks in the Sousa Basin (particularly in the Sousa Formation, Lower Cretaceous) may be related to the role of the mats in their preservation. Observations on recent microbial mats show that footprint morphology is related to the mat thickness and to the water content of the mat and the underlying sediment. In dry mats, generally poorly defined or no footprints are produced, while in saturated ones the imprints are well-defined, sometimes with well-defined displacement rims. The formation of well-defined displacement rims around the prints of large dinosaurs occurs in thick, plastic, moist to water-unsaturated microbial mats on top of moist to water-unsaturated sediment. These aspects are commonly observed in the tracks of the Passagem das Pedras site in the Sousa Basin. The footprint consolidation and its early lithification probably occurred due the existence of microbial mats that allowed a more cohesive substrate, preventing the footprints from erosion. The sediments were initially stabilized by early cementation and by the mat fabric over the tracks. Successive flooding, and subsequent sediment influx allowed the large number of layers with dinosaur tracks and sedimentary structures.  相似文献   

基于深度学习的介形类化石识别     

安玉钏  陈雁  黄玉楠  李平  蒋裕强 《地质论评》2021,67(6):67112001-67112001

介形类化石对地质年代的确定、古湖泊和古海洋的研究、古环境的重建以及海底石油资源的勘探等工作都具有重要意义。然而,现有识别化石颗粒的方法费时费力,准确率也有待提高。鉴于介形类化石颗粒的类别具有科、属、种的层次结构,种类数量庞大,所以本文提出了一种层次化识别方法。首先进行目标检测,实现介形类化石的定位与属类划分;之后在目标检测模块的基础上进行智能识别,使用卷积神经网络和支持向量机提取属类下更细微的种类特征,实现化石种类划分。实验结果表明,本文提出的分层次识别模型能检测出化石图像中所有化石颗粒的位置信息并对其进行分类,分类准确率可达95%,且相较于未进行分层次识别的模型,能将识别准确率提升1.8%~5.8%。  相似文献   

内蒙古乌拉特中旗恐龙足迹研究   总被引：8，自引：1，他引：7  

李建军  白志强  Martin Lockley  周彬  刘疆  宋宇 《地质学报》2010,84(5):723-742

2006年内蒙古地质环境监测院在乌拉特中旗海流图镇西10公里处发现一恐龙足迹化石点。由于恐龙足迹产地的地层研究程度较低,因此这批恐龙足迹的研究在地层年代确定、以及恢复古环境方面具有重大意义。共识别出脊椎动物足迹化石119个,其中大部分为恐龙足迹,包括兽脚类恐龙足迹:玫瑰实雷龙足迹(Eubrontes glenrosensis)、海流图卡岩塔足迹(Kayentapus hailiutuensis ichnosp.nov)和鸟脚类恐龙足迹中型异样龙足迹种(Anomoepus intermedius),以及鳄类足迹的蛙步足迹,其中海流图卡岩塔足迹(Kayentapus hailiutuensisichnosp.nov)为新种。根据足迹形态的对比,推断造迹恐龙分别为兽脚类恐龙中的巨齿龙类(Megalosaurus)和双脊龙类(Dilophosaurus)以及鸟脚类恐龙棱齿龙类(Hypsilophodont)。通过对比发现乌拉特与波兰Opatw附近的Podole地区的早侏罗世的足迹组合十分相似,因此建议将乌拉特中旗海流图的足迹及含足迹地层的年代归入侏罗纪早期。根据对足迹产地附近的地层剖面的研究以及足迹组合中含大量鸟脚类恐龙足迹的事实推断:侏罗纪早期研究区古环境为山涧河流环境,雨量充沛。  相似文献