Cretaceous Research最新文献_第6页

Calcareous nannofossil biostratigraphy of the upper Cretaceous to lower Paleocene in Zagros Basin, western Iran 伊朗西部扎格罗斯盆地上白垩统—下古新统钙质纳米化石生物地层学

IF 1.7 3区地球科学 Q1 GEOLOGY

Cretaceous Research

Pub Date : 2025-09-03 DOI: 10.1016/j.cretres.2025.106213

Noushin Moradi Lirkashasi , Sakineh Arefifard , Thomas J. Algeo , Jonathan D. Schueth

Calcareous nannofossil biostratigraphy has been investigated for Upper Cretaceous and lowermost Paleocene deposits in the Garab section located on the northeastern limb of the Kabir Kuh Anticline, Zagros Basin (Iran). The results reveal a relatively complete record that spans the Cenomanian to Danian stages. The base of the section contains Eiffellithus turriseiffelii, implying placement in or above the UC0 Biozone, and the occurrence of Corollithion kennedyi at 68.8 m confirms placement in the Cenomanian. An unconformity is suggested by the missing UC15a-b Biozone in the upper Campanian Gurpi Formation. The Cenomanian/Turonian Boundary (CTB) and Oceanic Anoxic Event 2 (OAE2) is characterized by abundant small taxa including Biscutum constans, Discorhabdus ignotus, and Zeugrhabdotus noeliae, among which the last two taxa are indicators of surface-water fertility during OAE2. The Cretaceous/Paleogene Boundary (KPB) is marked by an increase of abundance of calcareous nannofossils such as Braarudosphaera bigelowii and Neobiscutum spp. and a rapid increase of calcareous dinoflagellates. Our results document high nannofossil productivity during the OAE2, as observed in other Tethyan locations, and rapid turnover and proliferation of disaster taxa such as Braarudosphaera bigelowii, and Neobiscutum spp. at the KPB. These results significantly enhance our understanding of these geological events and suggest that the Garab section is a strong candidate for further study of both the Cenomanian/Turonian boundary and K/Pg boundary.

对伊朗Zagros盆地Kabir Kuh背斜东北翼Garab剖面上白垩统和下古新统钙质纳米化石生物地层学进行了研究。结果显示了一个相对完整的记录，跨越了塞诺曼尼亚到丹尼尼亚阶段。该剖面底部含有艾菲ellithus turriseiffelii，表明其位于UC0生物带或以上，而在68.8 m处出现的corollithon kennedyi证实其位于Cenomanian。上坎帕统古尔皮组缺少UC15a-b生物带，提示不整合。Cenomanian/Turonian Boundary （CTB）和Oceanic Anoxic Event 2 （OAE2）的特征是存在大量的小类群，包括brustum constans、Discorhabdus ignotus和Zeugrhabdotus noeliae，其中后两个类群是OAE2期间地表水肥沃度的指标。白垩纪-古近纪界线（KPB）以brarudosphaera bigelowii和Neobiscutum sp.等钙质纳米化石的丰度增加和钙质鞭毛藻的快速增加为标志。我们的研究结果表明，在其他特提斯地区观察到的OAE2期间，纳米化石的生产力很高，KPB的灾难分类群（如Braarudosphaera bigelowii和Neobiscutum spp.）的更替和增殖也很快。这些结果大大提高了我们对这些地质事件的认识，并表明Garab剖面是进一步研究Cenomanian/Turonian边界和K/Pg边界的有力候选者。

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引用次数: 0

Vegetation and climate during the primary formation of the Songliao Basin, NE China 松辽盆地初生期的植被与气候

IF 1.7 3区地球科学 Q1 GEOLOGY

Cretaceous Research

Pub Date : 2025-09-03 DOI: 10.1016/j.cretres.2025.106217

Miaoqin Lin , Jianguo Li , Yixiao Wu , Tan Tan , Yigang Xu

The International Continental Scientific Drilling Project (ICDP) in the Songliao Basin that has produced a continuous core of the Lower Cretaceous in 4134.81 m thickness, i.e. the SK-II borehole, provides an exceptional archive for studying tectonic and palaeoenvironmental history of the basin under the Cretaceous greenhouse climate. The Shahezi Formation that consists of the main part of this core, represents the primary basin fills at the syn-rift stage of the Songliao Basin and thus marks its commencement and is crucial for studying the timing and mechanism of this basin's early evolution. The precise age of the Shahezi Formation, however, remains controversial and little is known about the palaeovegetation and palaeoenvironment during its deposition. In this study, plenty of pollen and spores are extracted from core samples near the base of the Shahezi Formation. They are the oldest fossils so-far identified from the SK-Ⅱ borehole. The high abundance and diversity of Cicatricosisporites, in association with some other fossils as Pilosisporites, indicate a clear early–middle Aptian age for the base of the Shahezi Formation, i.e. the primary formation of the Songliao Basin. The vegetation was overall featured by abundant ferns, common cycads and some bryophytes in the ground storey, alongside conifer trees or shrubs of Pinaceae, Taxodiaceae, Araucariaceae and Cheirolepidiaceae in the upper canopy, with increases of Cheirolepidiaceae and cycads over time. A generally warm and humid tropical to subtropical climate with a trend to be slightly drier was developed, which might be a response of terrestrial ecosystem to the Oceanic Anoxic Event 1a.

国际大陆科学钻探项目（ICDP）在松辽盆地取得了厚度为4134.81 m的下白垩统连续岩心SK-II钻孔，为研究该盆地在白垩系温室气候下的构造和古环境史提供了一个独特的档案。该岩心的主体沙河子组代表了松辽盆地同裂谷期的主要盆地充填，标志着松辽盆地的开始，对研究松辽盆地早期演化的时间和机制具有重要意义。然而，沙河子组的确切年代仍有争议，对其沉积时期的古植被和古环境知之甚少。本研究从沙河子组底部附近的岩心样品中提取了大量的花粉和孢子。它们是迄今为止在SK-Ⅱ钻孔中发现的最古老的化石。cicatricosporites的高丰度和多样性，与其他一些化石（如Pilosisporites）相结合，表明松辽盆地沙河子组基底明显处于早-中阿普tian时代，即原始地层。植被总体上以地面层丰富的蕨类植物、普通苏铁和部分苔藓植物为特征，上层林冠层有松科、红杉科、云杉科和铁杉科的针叶乔木或灌木，随着时间的推移，铁杉科和铁杉科的数量有所增加。形成了温暖湿润的热带—亚热带气候，并有偏干燥的趋势，这可能是陆地生态系统对海洋缺氧事件1a的响应。

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引用次数: 0

New fossil notostracans (Branchiopoda, Notostraca) from the Lower Cretaceous of Inner Mongolia, China 内蒙古下白垩世notostracans新化石（鳃足目，Notostraca）

IF 1.7 3区地球科学 Q1 GEOLOGY

Cretaceous Research

Pub Date : 2025-09-02 DOI: 10.1016/j.cretres.2025.106216

Wei-Wei Wang , Dong Ren , Zhi-Peng Zhao

Nototracans have lived on Earth for over 350 million years, yet limited species records and poor specimen preservation have significantly impeded our understanding of their early evolutionary history. Herein, we supplement the information of a known species and report a new species, Weichangiops trangularis Yang and Hong, 1980 and Weichangiops squamosus sp. nov., from the Lower Cretaceous Yixian Formation in Duolun, Inner Mongolia, China. The diagnosis characters of Weichangiops Yang and Hong, 1980 and W. trangularis were revised based on the new well-preserved specimens. These newly discovered fossil specimens allow for a detailed summary of morphological characteristics in Notostraca, with a systematic review of features observed in Cretaceous lineages. Given the relatively rarity of Cretaceous notostracan fossils, these findings not only expand the known species diversity of this period but also provide valuable insights into the early evolutionary processes of Notostraca.

Nototracans已经在地球上生活了3.5亿多年,但有限的物种记录和可怜的标本保存大大阻碍了我们对他们早期的进化历史的理解。本文补充了内蒙古多伦地区下白垩统易县组已知种的资料，并报道了Weichangiops trangularis Yang和Hong， 1980和Weichangiops squamosus sp. nov.的新种。根据保存完好的新标本，对Weichangiops Yang和Hong， 1980和W. trangularis的诊断特征进行了修订。这些新发现的化石标本使我们能够对Notostraca的形态特征进行详细的总结，并对白垩纪谱系中观察到的特征进行系统的回顾。考虑到白垩纪notostracan化石的相对稀罕性，这些发现不仅扩大了这一时期已知物种的多样性，而且为Notostraca的早期进化过程提供了有价值的见解。

引用次数: 0

Foraminifera and ostracod biostratigraphy of the English Coniacian – Campanian (Upper Cretaceous) Chalk: New results from Seaford Head and correlation to Eastern Europe 英国Coniacian - Campanian（上白垩世）白垩系有孔虫和介形虫生物地层：来自seford Head的新结果和与东欧的对比

IF 1.7 3区地球科学 Q1 GEOLOGY

Cretaceous Research

Pub Date : 2025-08-30 DOI: 10.1016/j.cretres.2025.106215

Ian Jarvis , Zofia Dubicka , Markéta Chroustová

The uppermost Turonian – lower Campanian Chalk succession at Seaford Head, southern England, is described and the placement of stage and substage boundaries are defined. Previous studies of foraminifera and ostracods in the section are reviewed. New data are provided for 99 samples spanning the full exposed section. Samples yielded abundant well-preserved diverse microfossil assemblages. The stratigraphic distributions of 38 selected stratigraphically important foraminifera species of Gavelinella, Stensioeina, Protostensioeina, Bolivina, Bolivinoides, Pyramidina, Pseudouvigerina and planktonic foraminifera (Contusotruncana, Globotruncana, Marginotruncana), and 40 ostracod taxa are presented. A list of taxa with taxonomic notes and descriptions of five new foraminifera species, Gavelinella praestelligera, G. praethalmanni, G. praetumida, Protostensioeina ukrainica and Stensioeina praeexsculpta, and three informal species, Pyramidina sp. A, B and C is included. Evolutionary lineages of foraminifera genera provide the basis for a refined biostratigraphy that is successfully correlated to Salzgitter-Salder, Germany and Dubivtsi, Ukraine. Records are compared to literature data and benthic foraminifera zonations across northern Europe. However, differing taxonomic concepts of authors hamper comparison with literature data, exemplified by critical review of previous work at Seaford Head. This precludes rigorous assessment of diachronism of marker species, although regional stratigraphic differences in the distribution of the first stensioeinids and representatives of the Gavelinella clementiana group in Europe are apparent. The first detailed ostracod records from the English Coniacian – Campanian are presented. Four new ostracod biozones defined by the lowest occurrences of the index taxa are proposed: Neocythere (Physocythere) virginea; Limburgina senonensis; Phacorhabdotus lonsdaleianus; and Pterygocythere laticristata zones.

描述了英国南部Seaford Head的上Turonian -下Campanian白垩系序列，并确定了阶段和次阶段边界的位置。本文对该段有孔虫类和介形虫类的研究进行了综述。提供了99个样本的新数据，覆盖了整个暴露剖面。样品产生了大量保存完好的各种微化石组合。本文介绍了38种具有重要地层意义的有孔虫（Gavelinella, Stensioeina, Protostensioeina, Bolivina, Bolivinoides, Pyramidina, Pseudouvigerina）和浮游有孔虫（Contusotruncana, Globotruncana, Marginotruncana）以及40个介形虫类群的地层分布。本文收录了有孔虫新种（Gavelinella praestelligera、g.p aeethalmanni、g.p praetumida、Protostensioeina ukrainica和praeexsculpta）和非正式种（Pyramidina sp. A、B和C），并附有分类注释和描述。有孔虫属的进化谱系为精细的生物地层学提供了基础，成功地将其与德国萨尔茨吉特-萨尔德和乌克兰杜比夫茨相关联。将记录与文献数据和北欧底栖有孔虫带进行比较。然而，作者的不同分类概念阻碍了与文献数据的比较，例如对以前在西福德海德工作的批判性审查。这就排除了对标志物种的历时性的严格评估，尽管在欧洲，第一批张氏纲和Gavelinella clementana群的代表在分布上的区域地层差异是明显的。本文首次详细记录了英国康涅西亚-坎帕尼亚的介形类。本文提出了四个新的介形类生物带：Neocythere (physicythere) virginea；Limburgina senonensis;Phacorhabdotus lonsdaleianus;和翼状细胞的乳化带。

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引用次数: 0

More diverse and abundant than assumed: Eucommiidites pollen preserved in a deltaic setting (Lower Cretaceous) of the Araripe Basin (NE Brazil) 比想象的更加多样化和丰富：在Araripe盆地（巴西东北部）的一个三角洲环境（下白垩纪）中保存的真丝虫花粉

IF 1.7 3区地球科学 Q1 GEOLOGY

Cretaceous Research

Pub Date : 2025-08-30 DOI: 10.1016/j.cretres.2025.106210

Christa-Ch. Hofmann , Ulrich Heimhofer , Emily A. Roberts , Leyla J. Seyfullah

Twelve species of Eucommiidites pollen from deltaic sedimentary rocks of the Rio da Batateira and lowermost Crato formations are here described and depicted with light microscopy (LM) and scanning electron microscopy (SEM). A clump of Eucommiidites sp. 6 from sample CAS 27 of the lowermost Crato Formation is thought to be the dispersed equivalent of in situ pollen of Araripestrobus resiniferous found in the laminitic limestone of the Crato Formation. The other Eucommiidites taxa are known only as dispersed taxa. The separation of individual Eucommiidites species using LM is often very difficult and helped by the use of SEM to observe the position of lateral sulci/furrows, plus the sculpture and ornamentation of the sulcus membrane and ektexine. Only two Eucommiidites taxa, E. sp. 2 and E. sp. 3, occur frequently and generally abundantly in medium percentages (4–15 %) in the pollen sum throughout the section, and are interpreted to come from either wind pollinated plants or plants with no specific edaphic requirements. All other taxa are interpreted to have grown further away from the distributary channels, probably in more specialized stands. Two of them (Eucommiidites sp. 6 and E. sp. 8) are preserved in clumps and are suggested to be animal pollinated. The presence of unusually high percentages of 8–14 % of Eucommiidites in the pollen sums reveal that Eucommiidites taxa constituted a significant portion of the ancient vegetation habitats located upriver, but only comprise a few fragments in the macrofossil record of the Araripe Basin.

本文用光学显微镜（LM）和扫描电镜（SEM）对巴泰拉盆地里约热内卢da Batateira和克拉托盆地最下层的三角洲沉积岩中的12种真丝虫花粉进行了描述和描绘。在克拉托组下部CAS 27样品中发现的一团eucommiites sp. 6被认为是在克拉托组层状灰岩中发现的Araripestrobus resiniferous原位花粉的分散等效物。其他真丝目分类群只被称为分散分类群。借助扫描电镜观察侧面沟/沟的位置，再加上沟膜和边缘的雕刻和纹饰，利用LM分离单个的真丝虫物种通常是非常困难的。在整个剖面的花粉总数中，只有2个菊科植物分类群E. sp. 2和E. sp. 3以中等比例（4 - 15%）出现频率高且数量普遍丰富，可以解释为来自风传粉植物或无特定土壤要求的植物。所有其他分类群都被解释为生长在离分流河道更远的地方，可能是在更专门的林分上。其中2种（eucommidites sp. 6和e.p sp. 8）呈丛状保存，推测为动物传粉。在花粉总数中，真丝虫的比例高达8 ~ 14%，表明真丝虫类群在上游古植被生境中占有重要地位，但在Araripe盆地的宏观化石记录中仅占少数碎片。

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引用次数: 0

A large lamniform shark from the Aptian of Villa de Leiva (Boyacá, Colombia), based on the first Lower Cretaceous shark specimen preserving both teeth and vertebrae 来自Villa de Leiva （boyac<e:1>，哥伦比亚）Aptian的一种大型板状鲨鱼，基于第一个保存牙齿和椎骨的下白垩纪鲨鱼标本

IF 1.7 3区地球科学 Q1 GEOLOGY

Cretaceous Research

Pub Date : 2025-08-28 DOI: 10.1016/j.cretres.2025.106211

Cristian D. Benavides-Cabra , María E. Páramo-Fonseca , José A. Narváez-Rincón , Daniel E. Pomar

We describe a new specimen of a lamniform shark from the upper Aptian of the Arcillolitas abigarradas Member of the Paja Formation of Villa de Leiva (Colombia). It represents the first lamniform shark specimen from the Lower Cretaceous with both teeth and vertebrae preserved. The specimen consists of several disarticulated but well-preserved teeth and well-preserved partially articulated vertebral centra, denticles and soft tissues. We refer the specimen to Protolamna ricaurtei, a species recently erected from a specimen found in the same formation. It is a lamniform shark characterized by proportionally small tearing-type teeth with small triangular main cusp, two pairs of small triangular lateral cusplets, and massive bilobated roots. The specimen represents a mature individual to be 6.65 m in total length, making it the oldest record of a gigantic lamniform. This specimen is the first evidence that not all macrophagous lamniforms follow the linear function relating crown height to total body length. Our taphonomic analysis indicates that the specimen must have rapidly reached an anoxic bottom, with low benthic activity, gentle currents, and with microbial mats that facilitated the rapid phosphatization of the soft tissues. Based on the preserved anatomy, we propose that Protolamna ricaurtei was a relatively slow but active swimmer feeding in tropical near-shore areas over small preys such as bony fishes, small sharks, squids, and crustaceans.

我们描述了来自Villa de Leiva（哥伦比亚）Paja组的Arcillolitas abigarradas上Aptian的一种新的板形鲨鱼标本。它代表了下白垩纪第一个保存了牙齿和椎骨的板状鲨鱼标本。标本由几颗脱臼但保存完好的牙齿和保存完好的部分脱臼的椎体中心、牙髓和软组织组成。我们认为该标本属于richaurtei原olamna，这是最近从同一地层中发现的标本中生长出来的一个物种。它是一种板形鲨鱼，其特征是成比例的小撕裂型牙齿，具有小三角形的主尖，两对小三角形的侧尖，和巨大的双叶根。该标本代表了一个成熟的个体，总长度为6.65米，使其成为最古老的巨型板形动物记录。该标本首次证明，并非所有巨噬细胞板状体都遵循冠高与体长的线性关系。我们的埋藏学分析表明，标本必须迅速到达缺氧的底部，底栖生物活动低，水流温和，微生物席促进了软组织的快速磷化。根据保存下来的解剖结构，我们认为ricaurteprotoolamna是一种相对缓慢但活跃的游泳者，以热带近岸地区的小型猎物为食，如硬骨鱼、小鲨鱼、鱿鱼和甲壳类动物。

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引用次数: 0

Early Cretaceous freshwater bivalves from northeastern Brazil: Insights into the evolutionary history of South American freshwater mussels 巴西东北部早白垩世淡水双壳类：对南美淡水贻贝进化史的洞察

IF 1.7 3区地球科学 Q1 GEOLOGY

Cretaceous Research

Pub Date : 2025-08-28 DOI: 10.1016/j.cretres.2025.106212

Victor R. Silva , Vitor B. Guerrini , Filipe G. Varejão , Rafael C. Silva , Katie Collins , Ismar S. Carvalho , Simon Schneider , Marcello G. Simões

We revise and describe the Early Cretaceous (Berriasian to Albian) freshwater bivalves from northeastern Brazil, including representatives of Unionida, Trigoniida, and potentially Sphaeriida. Three genera previously thought to be endemic to the Aptian to Albian Crato and Romualdo formations, Araripe Basin, Ceará State, i.e. Cratonaia, Araripenaia, and Monginellopsis, are now recorded from other interior basins. The Berriasian to Barremian Mont Serrat Conglomerate (Salvador Formation) of the Recôncavo Basin, Bahia State, hosts a diverse Unionida-dominated fauna, including Mycetopoda, Anodontites?, Cratonaia, and potentially also hyriids. Specimens tentatively assigned to the neomiodontid Musculiopsis also occur. This fauna has mixed Gondwanan and Laurasian affinities and likely thrived in ephemeral streams and/or floodplain lakes. Araripenaia is recorded from the Aptian Marizal Formation of the Tucano Basin. Supposed representatives of Sphaerium from the same strata are clam shrimps (Diplostraca). Cratonaia and Monginellopsis occur in the Aptian-Albian Itapecuru Formation of the Parnaíba Basin, Maranhão State. Articulated shells of Cratonaia, Araripenaia, and Monginellopsis are typically associated with fluvial-lacustrine deposits. Their common occurrence in Aptian-Albian strata of northeastern Brazil suggests dispersal via fluvial systems connecting the different sedimentary basins. These northeastern Brazilian assemblages are distinct from those of the Upper Cretaceous Bauru Basin in southeastern Brazil. Despite South America and North Africa being connected for most of the Early Cretaceous, no shared freshwater bivalves are known. The newly described faunas provide insight into South American Early Cretaceous freshwater mussel diversity when the proto-South Atlantic was dominated by alluvial and lacustrine settings hosting abundant but poorly known freshwater bivalves.

我们对巴西东北部早白垩世（Berriasian - Albian）淡水双壳类进行了修正和描述，包括Unionida、Trigoniida和Sphaeriida的代表。以前被认为是阿普tian到Albian克拉托和Romualdo组，Araripe盆地，cerar State特有的三个属，即Cratonaia， Araripenaia和Monginellopsis，现在从其他内陆盆地记录下来。巴伊亚州Recôncavo盆地的Berriasian - Barremian Mont Serrat砾岩（Salvador组）拥有多种以unionida为主的动物群，包括足类动物、Anodontites？克拉通那亚，也可能是混血儿。也出现了暂定为新齿纲肌肉纲的标本。这种动物混合了冈瓦纳和劳拉的亲缘关系，可能在短暂的溪流和/或洪泛区湖泊中繁衍生息。Araripenaia记录于Tucano盆地Aptian Marizal组。假定来自同一地层的球形目的代表是蛤虾（蛤虾属）。Cratonaia和Monginellopsis发生在马拉州Parnaíba盆地的Aptian-Albian Itapecuru组。克拉通、Araripenaia和Monginellopsis的铰接壳通常与河流-湖泊沉积有关。它们在巴西东北部Aptian-Albian地层中普遍存在，表明它们是通过连接不同沉积盆地的河流系统传播的。这些巴西东北部的组合与巴西东南部的上白垩纪Bauru盆地的组合不同。尽管在早白垩纪的大部分时间里，南美洲和北非是相连的，但没有已知的淡水双壳类动物。新描述的动物群提供了对南美早白垩世淡水贻贝多样性的深入了解，当时原南大西洋由冲积和湖泊环境主导，拥有丰富但鲜为人知的淡水双壳类。

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引用次数: 0

From the inside: Pathologies from a histological perspective of two elasmosaurids from the Upper Cretaceous of Antarctica and Argentina 从内部看：从组织学角度看来自南极洲和阿根廷上白垩纪的两只依拉丝龙的病理学

IF 1.7 3区地球科学 Q1 GEOLOGY

Cretaceous Research

Pub Date : 2025-08-22 DOI: 10.1016/j.cretres.2025.106208

Matias Mitidieri , Marianella Talevi , Yanina Herrera , Bruce Rothschild , Marta S. Fernández

Histopathology plays a fundamental role in the detailed analysis of various pathologies, as it allows for diagnosing diseases through microscopic examination of the affected tissues. These studies on Mesozoic marine reptiles are scarce, and almost non-existent in plesiosaurs. Here, two elasmosaurid plesiosaur specimens were examined: specimen MLP-PV 93-I-5-1, recovered from the lower Maastrichtian Snow Hill Island Formation (Vega Island, Antarctica), and specimen MML-PV 5, retrieved from the upper Maastrichtian Jagüel Formation (Salinas de Trapalcó, Río Negro). To obtain the histological sections, a fragmented rib was selected from the first specimen; and a transverse process, dorsal rib, and phalanx were chosen from the second. Pathological bone callus was observed on the rib sections of MLP-PV 93-I-5-1. Periosteal growth perpendicular to the long axis of the bone was observed on the transverse process, dorsal rib, and phalanx sections of MML-PV 5. The characteristics observed in specimen MLP-PV 93-I-5-1 are consistent with the diagnosis of a healing fracture. The characteristics observed in specimen MML-PV 5 are indicative of periostitis. Based on the histopathological study of the two elasmosaurid specimens, it was possible to identify abnormal internal variations in bone tissue and determine that both pathologies developed during the life of the elasmosaurids.

组织病理学在各种病理的详细分析中起着基本的作用，因为它允许通过显微镜检查受影响的组织来诊断疾病。这些关于中生代海洋爬行动物的研究很少，关于蛇颈龙的研究几乎没有。本文研究了两个依拉丝模龙蛇颈龙标本，分别是来自马斯特拉赫特下雪山岛组（Vega Island, Antarctica）的MLP-PV 93- i -5和来自马斯特拉赫特上部jag el组（Salinas de Trapalcó， Río Negro）的MML-PV 5。为了获得组织学切片，从第一个标本中选择了一根破碎的肋骨；而横突，背肋骨和指骨则是从第二处选取的。MLP-PV 93-I-5-1肋骨切片可见病理性骨痂形成。在MML-PV 5的横突、背肋和指骨切片上观察到垂直于骨长轴的骨膜生长。在标本MLP-PV 93-I-5-1中观察到的特征与骨折愈合的诊断一致。在标本MML-PV 5中观察到的特征表明骨膜炎。根据对这两种骨模龙标本的组织病理学研究，可以识别出骨组织的异常内部变异，并确定这两种病理都是在骨模龙的一生中发展起来的。

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引用次数: 0

Integrated carbon isotope stratigraphy and biostratigraphy of Cenomanian to Turonian carbonates from Jordan – An updated age model and sequence stratigraphic correlations with Oman 约旦塞诺曼—土鲁期碳酸盐岩的综合碳同位素地层学和生物地层学——更新的年龄模型和与阿曼的层序地层对比

IF 1.7 3区地球科学 Q1 GEOLOGY

Cretaceous Research

Pub Date : 2025-08-05 DOI: 10.1016/j.cretres.2025.106207

Tojo Chirakal , Jihede Haj Messaoud , Ali Alibrahim , Khalil Ibrahim , Carine Grélaud , Amir Kalifi , John H. Powell , Frans van Buchem

A new integrated age model of the uppermost Albian to Coniacian Ajlun Group in West-Central Jordan is presented based on four complete outcrop sections along a ∼124 km N–S transect. Carbon isotope curves from this work are integrated with published carbon isotope data and constrained by new and existing nannofossil and ammonite biostratigraphy. Key identified carbon isotope events include the Mid-Cenomanian Event 1 (MCE 1), the Oceanic Anoxic Event 2 (OAE 2) at the Cenomanian/Turonian boundary and the Pewsey Event in the middle Turonian. The findings of this study corroborate and revise previous chemostratigraphic definitions in the study area, while also demonstrating a coeval origin of different lithostratigraphic units within the Ajlun Group. On the Arabian Plate scale, a detailed (3rd order) sequence stratigraphic correlation is made between Jordan and time-equivalent strata from the well-studied Natih Formation in Oman. These correlations help to evaluate the relative contributions of eustasy and tectonics on different plate tectonic settings, since the northeastern and eastern margins were heavily influenced by tectonic processes associated with the closure of the Neo-Tethys Ocean. In Oman, the creation of increased accommodation space (ca. 40 m) is observed relative to Jordan commencing in the interval between the MCE 1 and OAE 2. This suggests the onset of tectonic precursor events in Oman during the middle to late Cenomanian interval before the main tectonic phase in the Turonian, resulting in the termination of shallow water carbonate deposition. In contrast, Jordan remained in a largely passive margin setting.

基于沿N-S ~ 124 km的4个完整的露头剖面，提出了约旦中西部阿尔卑统至Coniacian Ajlun群的一个新的综合年龄模型。碳同位素曲线与已发表的碳同位素数据相结合，并受到新的和现有的纳米化石和菊石生物地层学的限制。关键的碳同位素事件包括Cenomanian Event 1 （MCE 1）、Cenomanian/Turonian边界的Oceanic缺氧Event 2 （OAE 2）和Turonian mid的Pewsey Event。本研究的发现证实和修正了研究区以往的化学地层学定义，同时也证明了阿基伦群内不同岩石地层单元的形成是同时期的。在阿拉伯板块尺度上，对约旦与阿曼Natih组时间等效地层进行了详细的（三级）层序地层对比。这些相关性有助于评估不同板块构造背景下的地壳运动和构造的相对贡献，因为东北和东部边缘受到与新特提斯洋闭合相关的构造过程的严重影响。在阿曼，与约旦相比，在MCE 1和OAE 2之间的间隔开始增加了住宿空间（约40米）。这表明阿曼的构造前驱事件发生在塞诺曼期中晚期，早于Turonian期主构造期，导致浅水碳酸盐岩沉积终止。相比之下，约旦在很大程度上处于被动的边缘地位。

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引用次数: 0

Revision of mid-Cretaceous Peltoperlidae (Insecta: Plecoptera) from Burmese amber, with description of two new species in a new genus 中白垩世缅甸琥珀Peltoperlidae的修正（昆虫亚目：翅翅目），附一新属两新种描述

IF 1.7 3区地球科学 Q1 GEOLOGY

Cretaceous Research

Pub Date : 2025-08-05 DOI: 10.1016/j.cretres.2025.106206

Zhi-Teng Chen , Pavel Sroka , Thomas van de Kamp , Arnold H. Staniczek

This study delves into the taxonomy of the stonefly family Peltoperlidae known from mid-Cretaceous Burmese amber. Based on a broad survey, the fossil family Petroperlidae Sroka, Staniczek & Kondratieff, 2018 is herein considered as a subfamily (Petroperlinae stat. nov.) within Peltoperlidae; and the subfamily Borisoperlinae Chen and Xu, 2020 syn. nov. is synonymized with Petroperlinae stat. nov. The diagnostic characters of all genera of Petroperlinae stat. nov. are revised and summarized. In addition, two new petroperline stoneflies, Graciloperla bulbosa gen. et sp. nov. and Graciloperla stylata gen. et sp. nov., are described based on male adults, which exhibit well-preserved aedeagal structures, the first known for fossil Peltoperlidae.

本研究探讨了中白垩纪缅甸琥珀中已知的石蝇科Peltoperlidae的分类。根据广泛的调查，化石科Petroperlidae Sroka， Staniczek & & & Kondratieff， 2018被认为是Peltoperlidae中的一个亚科（Petroperlinae stat. 11 .）；Chen and Xu, 2020 syn11 .与Petroperlinae stat. 11同义。对Petroperlinae stat. 11各属的诊断特征进行了修订和总结。此外，本文还描述了两种新的石蝇，Graciloperla bulbosa gen. et sp. nov.和Graciloperla stylata gen. et sp. nov.，这两种石蝇基于雄性成虫，它们具有保存完好的aedeagal结构，这是在Peltoperlidae化石中首次发现的。

引用次数: 0