Cretaceous Research最新文献_第3页

Latest Maastrichtian climate changes: Insights from high-resolution palynological data from the XHY2008 borehole, Jiayin, NE China 最新的马斯特里赫特气候变化：来自中国东北嘉印XHY2008钻孔高分辨率孢粉数据的见解

IF 1.7 3区地球科学 Q1 GEOLOGY

Cretaceous Research

Pub Date : 2025-11-26 DOI: 10.1016/j.cretres.2025.106270

Jiahui Yu , Yuewu Sun , Eugenia V. Bugdaeva , Valentina S. Markevich

The latest Maastrichtian was an important interval in Earth's history, characterized by global climatic fluctuations and significant biotic transitions. Understanding the climate and vegetation changes during this time is important for reconstructing the climatic perturbations during the pre-end-Maastrichtian mass extinction and elucidating the cause of the extinction. However, detailed reconstructions of terrestrial climate and vegetation changes remain limited due to the uneven preservation of palynomorphs and the scarcity of high-resolution palynological records. In this study, based on high-resolution palynological data from the Furao Formation in the XHY2008 borehole, Jiayin, Heilongjiang Province, Northeast China, three latest Maastrichtian palynological assemblages were identified, in ascending stratigraphic order: (1) the Gabonisporis–Pinuspollenites–Aquilapollenites assemblage; (2) the Laevigatosporites–Monocolpopollenites–Ulmoideipites assemblage; and (3) the Osmundacidites–Pseudointegricorpus–Wodehouseia assemblage. These assemblages provide key insights into the composition of latest Maastrichtian palynoflora and associated climatic changes. The data indicate that the latest Maastrichtian climate was warm and humid (i.e., subtropical) in the mid-latitudes of the Northern Hemisphere, which was typical of the Cretaceous greenhouse climate. However, two cooling and drying events were recognized based on quantitative analyses of the palynomorphs using principal component analysis and ecological affinity statistics. These two transient events involved changes from a subtropical–humid to temperate–subhumid climate in the last 34 kyr of the Cretaceous. These short-term climatic changes might record abrupt climatic perturbations during latest Maastrichtian cooling and enhance our knowledge on the frequency of climatic change.

最新的马斯特里赫特时期是地球历史上的一个重要时期，其特征是全球气候波动和重大的生物转变。了解这一时期的气候和植被变化对重建末马斯特里赫特大灭绝前的气候扰动和阐明大灭绝的原因具有重要意义。然而，由于孢粉形态的保存不均匀和高分辨率孢粉记录的缺乏，陆地气候和植被变化的详细重建仍然有限。本文利用黑龙江嘉印XHY2008钻孔富饶组高分辨率孢粉资料，确定了3个最新的马氏孢粉组合，按地层顺序依次为：(1)Gabonisporis-Pinuspollenites-Aquilapollenites组合；(2) laevigatosporites - monocolpoplenites - ulmoideipites组合；(3) Osmundacidites-Pseudointegricorpus-Wodehouseia组合。这些组合为了解最新的马斯特里赫特孢粉植物的组成和相关的气候变化提供了关键的见解。研究结果表明，马斯特里赫特最新气候为北半球中纬度温暖湿润的亚热带气候，属于典型的白垩纪温室气候。然而，基于主成分分析和生态亲和统计的定量分析，发现了两个冷却和干燥事件。这两个短暂的事件涉及到白垩纪最后34万年从亚热带湿润气候到温带半湿润气候的变化。这些短期气候变化可能记录了最近一次马斯特里赫特变冷期间突然的气候扰动，并增强了我们对气候变化频率的认识。

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引用次数: 0

A sauropod Tengrisaurus starkovi from the Lower Cretaceous of Transbaikalia, Russia, and Asiatic origin of Titanosauria 俄罗斯外贝加尔湖下白垩纪的一种腾格里龙和泰坦龙的亚洲起源

IF 1.7 3区地球科学 Q1 GEOLOGY

Cretaceous Research

Pub Date : 2025-11-25 DOI: 10.1016/j.cretres.2025.106271

Alexander O. Averianov , Alexander V. Sizov , Dmitry V. Grigoriev , Veniamin V. Kolchanov , Pavel P. Skutschas

Titanosauria is the final and most diverse radiation of sauropod dinosaurs, which is predominantly distributed throughout the Late Cretaceous of Gondwana. Previous hypotheses have suggested that Gondwana might have served as the origin for Titanosauria. However, the presence of a significant number of titanosaurs with procoelous caudal vertebrae in the Early Cretaceous of Asia indicates that the titanosaurian bauplan may have been established on the northern continents as early as the earliest Cretaceous. In contrast, the titanosaurs with procoelous both anterior and middle caudal vertebrae appeared in South America only during the Albian. The most recent research has identified the Tengrisaurus starkovi Averianov et Skutschas, 2017 from the Lower Cretaceous (Valanginian) Murtoi Formation at the Mogoito locality in Buryatia, Transbaikalia, Russia, as the earliest documented sauropod to display the titanosaurian bauplan, as evidenced by its procoelous anterior and middle caudal vertebrae. The present study reports on a recently discovered sauropod posterior cervical vertebra from the Mogoito locality, which is attributed to T. starkovi. A novel phylogenetic analysis, incorporating data from the cervical and caudal vertebrae, confirms the position of Tengrisaurus as a basal member of the titanosaurian clade Colossosauria. Consequently, the Valanginian Tengrisaurus is recognized as the earliest member of both Colossosauria and Titanosauria, which substantially supports a potential Asiatic origin of these clades.

泰坦龙是蜥脚类恐龙中最后的也是最多样化的一种，主要分布在晚白垩纪的冈瓦纳。先前的假说认为冈瓦纳可能是泰坦龙的起源。然而，早白垩纪亚洲地区大量具有原骨尾椎骨的泰坦巨龙的存在表明，早在白垩纪早期，泰坦巨龙群可能已经在北方大陆建立起来。相比之下，具有前尾椎骨和中尾椎骨的泰坦龙仅在阿尔比亚时期出现在南美洲。最近的研究发现，来自俄罗斯外贝加尔湖布里亚特地区Mogoito地区下白垩纪（Valanginian） Murtoi组的Tengrisaurus starkovi Averianov et Skutschas， 2017年，是最早记录的显示巨龙bauplan的蜥脚类动物，其前缘和中尾椎骨证明了这一点。本研究报告了最近在Mogoito地区发现的一种蜥脚类动物后颈椎，其归属于T. starkovi。一项新的系统发育分析，结合了来自颈椎和尾椎的数据，证实了Tengrisaurus是泰坦龙分支Colossosauria的基础成员。因此，Valanginian Tengrisaurus被认为是Colossosauria和Titanosauria的最早成员，这基本上支持了这些分支的潜在亚洲起源。

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引用次数: 0

A new species of Pahasapasaurus (Plesiosauria: Polycotylidae) from the upper Cretaceous (lower Turonian) Tropic Shale of southern Utah, U.S.A. 美国犹他州南部上白垩世（下Turonian）热带页岩中的一新种（蛇颈龙目：多子龙科）

IF 1.7 3区地球科学 Q1 GEOLOGY

Cretaceous Research

Pub Date : 2025-11-25 DOI: 10.1016/j.cretres.2025.106269

Rebecca L. Schmeisser McKean

The Tropic Shale is an Upper Cretaceous (Cenomanian–Turonian) formation that was deposited along the western side of the Cretaceous Western Interior Seaway. The biodiversity within the Tropic Shale is high, with marine organisms including ammonoids, bivalves (clams, oysters), gastropods, actinopterygians, chondrichthyans, turtles, mosasaurs, and plesiosaurs. This paper describes a new polycotylid plesiosaur, Pahasapasaurus gillettei sp. nov., based on a well-preserved, partial skeleton from the Tropic Shale of southern Utah, U.S.A. Several characteristics from this specimen are shared with the genus Pahasapasaurus, including the morphology of the palate (lack of an anterior interpterygoid vacuity, a robust parasphenoid with ventral keel), an elongated temporal fenestra, a low tooth count in the mandibular symphysis, and the lack of a posterodistal expansion of the humerus. Pahasapasaurus gillettei is distinct in possessing teeth with smooth enamel, a posterior extension of the squamosals along the midline, a low maxillary tooth count, a small posterolateral extension of the coracoid, as well as a unique combination of characters. Pahasapasaurus was previously known from a single species (P. haasi) from the upper Cenomanian Greenhorn Limestone of South Dakota, U.S.A., deposited along the eastern side of the Western Interior Seaway. The discovery of P. gillettei extends the known range of the genus Pahasapasaurus into slightly younger (lower Turonian) sediments along the opposite side of the seaway and has implications for the evolutionary history of polycotylid plesiosaurs. Pahasapasaurus gillettei also adds a sixth species of short-neck plesiosaur to the Tropic Shale, expanding the known biodiversity of this productive formation.

热带页岩是沿白垩纪西部内陆海道西侧沉积的上白垩统（塞诺曼—turonian）组。热带页岩的生物多样性很高，海洋生物包括菊石类、双壳类（蛤蜊、牡蛎）、腹足类、放光鳍类、软骨鱼类、海龟、沧龙和蛇颈龙。本文描述了一种新的多子叶蛇颈龙，Pahasapasaurus gillettei sp. nov.，基于美国犹他州南部热带页岩中保存完好的部分骨骼，该标本的几个特征与Pahasapasaurus属相同，包括上颚的形态（缺乏前翼状间隙，具有腹侧龙骨的粗大副骨），延长的颞窗，下颌联合中的低齿数，而且肱骨后远端没有扩张。gilletepahasapasaurus的独特之处在于牙齿釉质光滑，鳞片沿中线向后延伸，上颌牙齿数量少，喙后外侧延伸小，以及独特的特征组合。在此之前，人们从美国南达科塔州沿西部内陆海道东侧沉积的上切诺曼尼亚格林霍恩石灰岩中发现了一种Pahasapasaurus （P. haasi）。P. gillettei的发现将Pahasapasaurus属的已知范围扩展到沿海道对面的稍微年轻的（下Turonian）沉积物中，并对多子叶蛇颈龙的进化史具有启示意义。吉列帕萨龙还为热带页岩增加了第六种短颈蛇颈龙，扩大了这一多产地层的已知生物多样性。

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引用次数: 0

A revision of the lower cretaceous heteromorphic ammonite species Anisoceras carcitanense Matheron, 1880 and the introduction of Hourqueigella gen. nov. 下白垩统异形菊石Anisoceras carcitanense Matheron， 1880的修订及Hourqueigella gen. nov的介绍。

IF 1.7 3区地球科学 Q1 GEOLOGY

Cretaceous Research

Pub Date : 2025-11-20 DOI: 10.1016/j.cretres.2025.106266

Camille Frau

The revision of the heteromorph ammonite Anisoceras carcitanense Matheron, 1880, supports the establishment of the new genus Hourqueigella gen. nov. Its suture line, characterized by a very deep, symmetrically trifid adventive lobe and a broad, bipartite lateral saddle, together with medium-sized hamulicone coiling featuring an extended retroversum and simple ribbing, indicates close affinities with certain members of the family Acrioceratidae Vermeulen, particularly the atuberculate pole of Toxoceratoides, previously assigned to the Tonohamites–Raymondcaseyites plexus. The combination of exceptionally large size, hamulicone coiling, and hypermorphic retroversum in Hourqueigella, however, demonstrates a clear generic distinction from these atuberculate Toxoceratoides. Examination of new topotype specimens from Cassis–Roquefort-La-Bédoule, southern France, confirms the presence of this species in the lower upper Aptian (lower Epicheloniceras martini Zone).

异形菊石Anisoceras carcitanense Matheron（1880）的修正支持了Hourqueigella gen. 11新属的建立，其缝合线的特征是非常深的对称的三裂外生裂片和宽的两裂侧鞍，以及中等大小的环形盘曲，具有延伸的后背和简单的肋，表明与Vermeulen family的某些成员有密切的关系。特别是弓形虫的管状极，以前属于托诺哈米特-雷蒙德卡塞基神经丛。然而，在Hourqueigella中，异常大的体型、假体盘绕和超形态的后足的组合表明了与这些疣状弓形虫的明显的一般区别。对来自法国南部cassis - roquefort - la - b doule的新形态标本的检查证实，该物种存在于阿普tian的下上部（下Epicheloniceras martini区）。

引用次数: 0

Reptile footprints on a pelagic seafloor as a vestige of a synsedimentary seismic event in the lower Campanian Scaglia Rossa basin of the Umbria-Marche Apennines (Italy) 意大利翁布里亚-马尔凯亚平宁地区坎帕尼亚下Scaglia Rossa盆地同沉积地震事件的深海海底爬行动物足迹

IF 1.7 3区地球科学 Q1 GEOLOGY

Cretaceous Research

Pub Date : 2025-11-19 DOI: 10.1016/j.cretres.2025.106268

Paolo Sandroni , Nathan S. Church , Rodolfo Coccioni , Fabrizio Frontalini , Maurizio Mainiero , Alessandro Montanari

A group of free climbers by chance discovered a large number of footprint traces deeply impressed on a vast pelagic limestone slab on the steep northeastern limb of the Monte Cònero anticline, near the city of Ancona (Marche region of central-eastern Italy). The footprints probably represent a stampede of panicking sea turtles that were mobilized en masse by an earthquake. These tracks were subsequently covered by a fluxoturbidite triggered by the same earthquake. The same layer is exposed in a 40-m-thick section along the littoral zone below. This new section provides the ability, through combined bio- and magneto-stratigraphic analysis, to place the footprint layer in the lower Campanian foraminiferal biozone Globotruncanita elevata and the lowermost part of magnetochron C33n. Most of this section comprises calcarenitic and calcilutitic turbidites interbedded with pelagic biomicrites, which witnessed a period of enhanced seismic activity exacerbated by a climate change-driven eustatic sea level fluctuation. Following a review of the sedimentological and tectono-seismic history of the Cretaceous Umbria-Marche paleobasin with particular attention to the Monte Cònero area, we describe and document our integrated stratigraphic analysis of the new section exposed along the northeastern littoral known as La Vela Beach.

在安科纳市（意大利中东部马尔凯地区）附近，一群自由登山者偶然发现了大量的足迹痕迹，这些足迹深深地印在Cònero山背斜陡峭的东北边缘的一块巨大的上层石灰石板上。这些脚印可能代表了一群惊慌失措的海龟在地震中被动员起来。这些足迹随后被同一次地震引发的滑塌浊积岩覆盖。同一层暴露在下面的沿海带40米厚的剖面中。这一新剖面通过结合生物和磁地层学分析，提供了将足迹层置于下坎帕纪Globotruncanita elevata有孔虫生物带和C33n磁时线最下部的能力。这一剖面大部分由钙屑岩和钙质浊积岩组成，它们与远洋生物碎屑岩互层，经历了一段地震活动增强的时期，气候变化驱动的海平面上升波动加剧了地震活动。在回顾了白垩纪翁布里亚-马尔切古盆地的沉积学和构造地震历史（特别是Monte Cònero地区）之后，我们描述并记录了我们对东北沿岸被称为La Vela海滩的新剖面的综合地层分析。

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引用次数: 0

Integrated biostratigraphic and paleoenvironmental framework of Aptian ostracods and foraminifera from the Codó Formation (Parnaíba and São Luís Basins, Northeast Brazil) 巴西东北部Codó组（Parnaíba和<e:1> o Luís盆地）Aptian介形类和有孔虫的综合生物地层和古环境格架

IF 1.7 3区地球科学 Q1 GEOLOGY

Cretaceous Research

Pub Date : 2025-11-18 DOI: 10.1016/j.cretres.2025.106264

Renata Juliana Arruda Maia , Enelise Katia Piovesan , Santana Holes Pereira De , Robbyson Mendes Melo , Lima Filho Mario Ferreira De , Rodolfo Dino , Luzia Antonioli

This work aims to expand knowledge of the taxonomy of ostracods from the Lower Cretaceous of Northeast Brazil, with an emphasis on the association recovered from wells in the Codó Formation of the Parnaíba and São Luís basins, integrating foraminiferal assemblages and facies analyses to refine paleoenvironmental interpretations. The results provided input for expanding biostratigraphic correlations based on ostracods and paleoenvironmental interpretations based on ostracods, foraminifera association, and facies analysis. For this work, samples were recovered from three wells: 2-ANP-5-MA, drilled in the São Luís Basin, and 1-FSS08-GJ and 9-PIF-16-MA, drilled in the Parnaíba Basin. The methodology included weighing, washing, drying, and sorting samples, followed by imaging and taxonomic identification. The dominant ostracods genera were Pattersoncypris Bate, Reconcavona Krömmelbein, and Cypridea Bosquet. Two new species were proposed: Pattersoncypris inflata and Ilyocypris tryponata. Identifying the guide species P. micropapillosa (Biozone OST-011) made it possible to position the samples in the Aptian, Lower Cretaceous. Benthic foraminifera specimens, representing nine genera and eleven taxa, were recovered from core 1-FSS08-GJ. The most abundant foraminifera genera are Bathysiphon and Rhizammina. From the integrated analysis of the association between carbonate microfossils and facies, it was possible to confirm the occurrence of marine influence during the Aptian in the Codó Formation, Parnaíba Basin.

本研究旨在扩大巴西东北部下白垩统介形类的分类知识，重点研究Parnaíba和 o Luís盆地Codó组井的关联，结合有孔虫组合和相分析来完善古环境解释。研究结果为扩展介形类的生物地层对比以及基于介形类、有孔虫组合和相分析的古环境解释提供了输入。在这项工作中，从3口井中回收了样品：在 o Luís盆地钻探的2-ANP-5-MA，以及在Parnaíba盆地钻探的1-FSS08-GJ和9-PIF-16-MA。方法包括称重、洗涤、干燥和分选样品，然后进行成像和分类鉴定。优势介形虫属为pattersoncypriis Bate、Reconcavona Krömmelbein和Cypridea Bosquet。提出了2个新种：膨龙鲤（Pattersoncypris inflata）和锥鱼鲤（ilycypris tryponata）。通过对该样品的鉴定，使其定位于下白垩统阿普tian地区。在1-FSS08-GJ岩心共采集到底栖有孔虫9属11类群。最丰富的有孔虫属是深孔虫和根孔虫。通过对碳酸盐岩微化石与相的综合分析，可以确定Parnaíba盆地Codó组Aptian期存在海相影响。

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引用次数: 0

Detrital zircon populations in the early cretaceous Laiyang Sag: Implications for the evolution of the Basin and peripheral orogenic belt 莱阳凹陷早白垩世碎屑锆石种群：对盆地及周边造山带演化的启示

IF 1.7 3区地球科学 Q1 GEOLOGY

Cretaceous Research

Pub Date : 2025-11-15 DOI: 10.1016/j.cretres.2025.106267

Chenlin Zhu , Chao Han , Zhigang Song , Shourui Dai , Jie Li , Yuetong Zhang , Xiang Ren , Zuozhen Han

During the Early Cretaceous, the Paleo Pacific Plate underwent extensive subduction beneath the Eurasian continent, which coincided with substantial lithospheric thinning in the North China Craton. The Jiaolai Basin, which formed during this period, is located along the southeastern margin of the North China Craton, and is positioned between the Sulu Orogenic Belt (SLOB) and the Jiaobei Terrane (JBT). The sedimentary sequences in the basin record relevant information on the evolution of the surrounding tectonic units. Thus, this study conducted petrographic and detrital zircon U–Pb geochronological analyses on sandstones from the Lower Cretaceous Laiyang Formation in the Laiyang Sag. The findings indicate that: (1) during the Early Cretaceous, detrital sources within the Laiyang Sag displayed a distinct evolutionary pattern: early-stage deposits were primarily sourced from the JBT, with a subsequent transition towards dual-source inputs from both the JBT and the SLOB. (2) At approximately 123 Ma, intensified faulting along the southern margin of Jiaolai Basin led to the rapid deposition of substantial amounts of detrital material from the SLOB. (3) The SLOB may have been exhumed above the surface during the Middle–Late Jurassic and continued to supply sediment to the Laiyang Sag.

早白垩世，古太平洋板块在欧亚大陆下进行了广泛的俯冲，与华北克拉通岩石圈的大量减薄相吻合。胶莱盆地形成于这一时期，位于华北克拉通东南缘，位于苏鲁造山带与胶北地体之间。盆地内的沉积层序记录了周围构造单元演化的相关信息。为此，本研究对莱阳凹陷下白垩统莱阳组砂岩进行了岩石学和碎屑锆石U-Pb年代学分析。结果表明：①早白垩世，莱阳凹陷碎屑物源演化模式明显，早期碎屑物源主要来自JBT，随后向JBT和SLOB双源输入过渡；(2)在123 Ma左右，胶莱盆地南缘断裂加剧，导致大量陆相碎屑物质快速沉积。(3)中晚侏罗世陆源岩可能已被发掘出地表，并继续为莱阳凹陷提供沉积物。

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引用次数: 0

†Trichochterus gen. nov., a new genus of velvety shore bugs from Burmese amber with strong terrestrial adaptation (Insecta: Hemiptera: Ochteridae) †毛翅虫属（Trichochterus gen. nov.），来自缅甸琥珀的一新属，具有很强的陆地适应性（昆虫纲：半翅目：毛翅虫科）

IF 1.7 3区地球科学 Q1 GEOLOGY

Cretaceous Research

Pub Date : 2025-11-12 DOI: 10.1016/j.cretres.2025.106265

Chunlan Xian , Pingping Chen , Qiang Xie , Yanhui Wang

A new genus of the family Ochteridae (Hemiptera: Nepomorpha), †Trichochterus gen. nov., is described from mid-Cretaceous, with two new species: †T. zhengi sp. nov. and †T. nieseri sp. nov. The new genus can be distinguished from other ochterids by its unique antennal structure and the first documented occurrence of trichobothrium-like setae within the family. Notably, the presence of trichobothria in velvety shore bugs represents a distinctive morphological feature, potentially reflecting ecological specialization in riparian or terrestrial habitats. Detailed morphological descriptions, supported by high-resolution photographs and illustrations, highlight the diagnostic characters of †Trichochterus gen. nov., such as the elongate rostrum, ridged frons, cursorial legs, and tarsal formula. An updated identification key and a comparative table are provided to facilitate the classification of all extant and fossil genera of Ochteridae. Furthermore, the phylogenetic placement of the newly established genus was assessed based on a morphological matrix.

从白垩纪中期开始记述了毛翅目（半翅目：毛翅目）一科新属†Trichochterus gen. nov.。郑州11月和†T。这个新属可以通过其独特的触角结构和在该科中首次记录到的类似毛状刚毛的出现而与其他ochterids区分开来。值得注意的是，丝状岸虫中毛虫的存在代表了一种独特的形态特征，可能反映了河岸或陆地栖息地的生态专业化。在高分辨率照片和插图的支持下，详细的形态学描述突出了†Trichochterus gen. nov.的诊断特征，如细长的喙、脊状的喙、弯曲的腿和跗骨公式。提供了一个更新的鉴定键和比较表，以方便对所有现存和化石属的分类。此外，基于形态学矩阵对新建立属的系统发育定位进行了评估。

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引用次数: 0

A continental record of the late Campanian negative carbon isotopic excursion (LCE, late Campanian event) in the Dinosaur Park Formation, Alberta, Canada 加拿大阿尔伯塔省恐龙公园组晚坎帕尼亚负碳同位素漂移（LCE，晚坎帕尼亚事件）的大陆记录

IF 1.7 3区地球科学 Q1 GEOLOGY

Cretaceous Research

Pub Date : 2025-11-10 DOI: 10.1016/j.cretres.2025.106263

Muditha Goonetilleke, Ricardo L. Silva, Paul R. Durkin

The Campanian was the longest stage of the Late Cretaceous and witnessed multiple global carbon cycle disruption episodes, including the negative carbon isotope excursion (CIE) known as the Late Campanian Event (LCE). However, Campanian-aged δ¹³C perturbations are primarily documented in marine environments, raising questions about their record in terrestrial settings and the potential use of terrestrial stable carbon isotope records from the Campanian as a chemostratigraphic tool. In this study, we present a stable carbon isotope record from fossil organic matter preserved in the alluvial floodplains of the Dinosaur Park Formation, which is radiometrically dated to the time interval containing the LCE. Results reveal a ∼0.8 ‰ negative CIE recorded in floodplain fossil organic matter. We show that the negative CIE is not a result of changing organic matter or diagenesis and that it likely reflects the global atmospheric δ¹³C signal during the Campanian. We interpreted the identified negative CIE as a continental record of the LCE. When we couple our δ¹³C_TOC record with the Dinosaur Park Formation's age model, we can correlate our section with other well-dated European marine stratigraphic sections. Our findings demonstrate that Campanian carbon cycle perturbations are preserved in terrestrial environments. For the first time, we recognize that the deposition of the world-famous dinosaur-bearing Dinosaur Park Formation in Alberta was contemporaneous with a major global carbon cycle perturbation episode. Our findings contribute to contextualizing ongoing research and re-evaluating previous studies on dinosaur evolution and other contemporary groups, within the framework of planetary-scale Earth system disturbances.

坎帕纪是晚白垩纪最长的阶段，经历了多次全球碳循环中断事件，包括被称为晚坎帕纪事件的负碳同位素偏移（CIE）。然而，坎帕尼亚期δ13C扰动主要记录在海洋环境中，这对它们在陆地环境中的记录以及坎帕尼亚期陆地稳定碳同位素记录作为化学地层学工具的潜力提出了质疑。在这项研究中，我们从恐龙公园组冲积洪泛平原中保存的化石有机质中获得了稳定的碳同位素记录，该记录的放射性年代可追溯到包含LCE的时间间隔。结果表明，河漫滩化石有机质的CIE值为- 0.8‰。结果表明，负的CIE值不是有机质变化或成岩作用的结果，它可能反映了坎帕纪全球大气δ13C信号。我们将确定的负CIE解释为LCE的大陆记录。当我们将δ13CTOC记录与恐龙公园组的年龄模型相结合时，我们可以将我们的剖面与其他确定年代的欧洲海相地层剖面相关联。我们的研究结果表明，坎帕尼亚碳循环的扰动在陆地环境中得到了保存。我们第一次认识到，世界著名的艾伯塔省恐龙公园组的沉积与一次重大的全球碳循环扰动事件是同时发生的。我们的发现有助于在行星尺度地球系统扰动的框架内，对正在进行的恐龙进化和其他当代类群的研究进行背景分析和重新评估。

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引用次数: 0

Diving in the Maastrichtian of Marambio (Seymour) Island: A new member of the Neoaves in the Cretaceous Antarctic avifauna 在马兰姆比奥（西摩）岛的马斯特里赫特岛潜水：白垩纪南极鸟类中新鸟类的新成员

IF 1.7 3区地球科学 Q1 GEOLOGY

Cretaceous Research

Pub Date : 2025-11-10 DOI: 10.1016/j.cretres.2025.106259

Facundo Irazoqui , Carolina Acosta Hospitaleche , Javier N. Gelfo , Ariana Paulina Carabajal , Paula Bona , Leonel Acosta Burlaille

A new genus and species of Cretaceous bird from Antarctica with implications for the early evolution of Neornithes is described here. The type specimen of Pujatopouli soberana gen. et sp. nov. (MLP-PV 08-XI-30-44), preserving part of the skull and postcranium, was recovered from Maastrichtian deposits of the López de Bertodano Formation on Marambio (Seymour) Island, James Ross Basin, West Antarctica. The phylogenetic relationships of Pujatopouli with other avian species, including all previously described Cretaceous birds from Antarctica, were assessed using two different datasets. The first, mainly composed of Mesozoic birds, places Pujatopouli within the crown group of birds (Neornithes), whereas the second, which includes a broad sampling of modern taxa, positions it within Neoaves, and closely related to the ‘core-waterbirds’ (Aequornithes). Besides, morphological evidence suggests that Pujatopouli was a foot-propelled diver with an ichthyophagous diet, living sympatrically with other neornithine birds along the Antarctic coast during the latest Cretaceous.

本文描述了一种来自南极洲的白垩纪鸟类的新属和新种，它与新鸟的早期进化有关。Pujatopouli soberana gen. et sp. nov. （MLP-PV 08-XI-30-44）的模式标本保存了部分头盖骨和后头盖骨，是在南极洲西部James Ross盆地Marambio （Seymour）岛的López de Bertodano组的Maastrichtian沉积物中发现的。使用两个不同的数据集评估了Pujatopouli与其他鸟类物种的系统发育关系，包括所有先前描述的来自南极洲的白垩纪鸟类。第一个主要由中生代鸟类组成，将Pujatopouli置于鸟类的冠群（Neornithes）中，而第二个包括现代分类群的广泛样本，将其置于新鸟群中，并与“核心水鸟”（Aequornithes）密切相关。此外，形态学证据表明，Pujatopouli是一种以脚为动力的潜水员，以食鱼为食，在白垩纪晚期与其他新鸟目鸟类共同生活在南极海岸。

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