Cretaceous Research最新文献_第9页

Pneumatic structures of sauropod cervical vertebrae from the Lower Cretaceous Sao Khua Formation of northeastern Thailand 泰国东北部下白垩世Sao Khua组蜥脚类动物颈椎的气动结构

IF 1.9 3区地球科学 Q1 GEOLOGY

Cretaceous Research

Pub Date : 2025-06-13 DOI: 10.1016/j.cretres.2025.106189

Kasidit Eiamlaor , Suravech Suteethorn , Phornphen Chanthasit , Varavudh Suteethorn , Kantapon Suraprasit

Internal structures of sauropod vertebrae are hollowed out by pneumatic diverticular systems similar to extant birds. Their vertebral columns contain extensive air sac systems that are highly prominent in the cervical regions. Here we analyze the pneumatic structures in the cervical vertebrae of two sauropod taxa: Phuwiangosaurus sirindhornae and a diplodocoid sauropod, from the Lower Cretaceous Sao Khua Formation of northeastern Thailand, using a CT-scan technique. The internal pneumatic structures of P. sirindhornae mainly consisted of camerae within the centrum and systems of camellae in the articulation regions, representing a semicamellate pattern. The diplodocoid sauropod exhibited a camerate pattern with its centrum filled with only pneumatic camerae. The semicamallate pattern of Phuwiangosaurus sirindhornae is similar to that of Brachiosaurus sp. and Giraffatitan brancai, differing from previous interpretations that suggested a close relationship to somphospondyls. Due to the more primitive internal structures of Phuwiangosaurussirindhornae, we instead propose that Phuwiangosaurus is a non-somphospondyl titanosauriform more closely related to brachiosaurids. In the Sao Khua diplodocoid sauropod, the vertebral pneumatization was much higher than in dicraeosaurids but less intense than in most neosauropods. The presence of a semicamellate pattern in Phuwiangosaurus extends the temporal range of such a condition to the Early Cretaceous, while the camerate pattern of the Sao Khua diplodocoid suggests that Cretaceous dicraeosaurids likely had a varying degree of pneumaticity, which might have evolved independently in their lineages.

蜥脚类动物椎骨的内部结构被类似于现存鸟类的气动憩室系统掏空。他们的脊柱包含广泛的气囊系统，在颈椎区域非常突出。本文利用ct扫描技术对泰国东北部下白垩世圣花组的Phuwiangosaurus sirindhornae和梁龙科蜥脚类恐龙的颈椎气动结构进行了分析。柽柳的内部气动结构主要由中心内的照相机和关节区的山茶花系统组成，呈半束状结构。梁龙科蜥脚类动物表现出照相机模式，其中央仅充满气动照相机。Phuwiangosaurus sirindhornae的半掌形模式与腕龙（Brachiosaurus sp.）和长颈鹿（Giraffatitan branchai）的相似，不同于以往认为与somphospondyls有密切关系的解释。由于Phuwiangosaurussirindhornae的内部结构更原始，我们认为Phuwiangosaurus是一种与腕龙类关系更密切的非somphospondyl泰坦龙。在圣华梁龙科蜥脚类动物中，椎体气化程度远高于二龙类动物，但低于大多数新蜥脚类动物。Phuwiangosaurus身上的半袖口模式将这种情况的时间范围扩展到了早白垩纪，而Sao Khua梁龙科的袖口模式表明，白垩纪的二龙类可能具有不同程度的气性，这可能是在它们的谱系中独立进化的。

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引用次数: 0

Side by side with titans: A new rebbachisaurid dinosaur from the Huincul Formation (upper Cenomanian) of Patagonia, Argentina 与泰坦并排：阿根廷巴塔哥尼亚Huincul组（上塞诺曼尼亚）发现的一种新的雷巴奇龙

IF 1.9 3区地球科学 Q1 GEOLOGY

Cretaceous Research

Pub Date : 2025-06-13 DOI: 10.1016/j.cretres.2025.106188

Flavio Bellardini , Leonardo S. Filippi , José L. Carballido , Alberto C. Garrido , Mattia A. Baiano

Rebbachisaurids are medium to large-sized, non-selective and ground-level browser diplodocoid sauropods, and they are characterised by highly specialised skulls, widely pneumatized axial elements and gracile appendicular skeletons. Known from the Early Cretaceous to the early Late Cretaceous, the rebbachisaurid fossil record is particularly diversified in Gondwana, with several specimens found in North Africa and South America. Notably, Patagonia has yielded over more than half of all known Rebbachisauridae, including the most basal forms and the youngest rebbachisaurid remains to date. Herein, we describe a new species of Rebbachisauridae from the Huincul Formation (upper Cenomanian) of the Neuquén Basin (Patagonia, Argentina): Astigmasaura genuflexa gen. et sp. nov. New laboratory work provided the complete osteology of the specimen MAU-Pv-EO-629, complementing the previously published hind limb anatomy. Thus, the type material of Astigmasaura comprises the posterior portion of an articulated, postcranial skeleton of a single, morphologically adult individual. Astigmasaura shares different conditions with other Rebbachisauridae, including anterior caudal vertebrae with tall neural spines and tetraradiate neural laminae, asymmetric middle haemal arches, mediolaterally compressed proximal tibiae, and femur with medially inclined distal condyles. Furthermore, Astigmasaura shows a unique combination of diagnostic features that distinguish it from all other sauropods. This new record not only provides new morphological information about the caudal and pelvic girdle anatomy of Rebbachisauridae, which is poorly known to date, and suggests a greater taxonomic diversification within the family during the last stages of its evolutionary history than known before.

Rebbachisaurids是中型到大型，非选择性和地面浏览梁龙科蜥脚类动物，它们的特点是高度特化的头骨，广泛气动的轴向元素和纤细的附肢骨骼。从早白垩纪到晚白垩纪早期，rebbachisaurd的化石记录在冈瓦纳特别多样化，在北非和南美洲发现了几个标本。值得注意的是，巴塔哥尼亚出土了超过一半的已知Rebbachisauridae，包括最基本的形式和迄今为止最年轻的Rebbachisauridae。在此，我们描述了一种来自neuqu 盆地（巴塔哥尼亚，阿根廷）Huincul组（上Cenomanian）的Rebbachisauridae新种：Astigmasaura genuflexa gen. et sp. 11 .新的实验室工作提供了标本MAU-Pv-EO-629的完整骨学，补充了先前发表的后肢解剖。因此，尾柱头的类型材料包括一个单一的、形态上的成年个体的关节、颅后骨骼的后部。尾前椎骨神经棘高，神经板四散，中间血弓不对称，胫骨近端内侧受压，股骨远端髁内侧倾斜。此外，Astigmasaura表现出独特的诊断特征组合，使其区别于所有其他蜥脚类动物。这一新记录不仅提供了迄今所知甚少的Rebbachisauridae科尾部和骨盆带解剖结构的新形态学信息，而且表明该科在其进化史的最后阶段具有比以前已知的更大的分类多样化。

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引用次数: 0

Vertebrate coprolites from the marine Upper Cretaceous of Coimbra (west-central Portugal): Palaeoenvironmental and palaeoecological significance 科英布拉（葡萄牙中西部）海相上白垩纪脊椎动物粪化石：古环境和古生态意义

IF 1.9 3区地球科学 Q1 GEOLOGY

Cretaceous Research

Pub Date : 2025-06-13 DOI: 10.1016/j.cretres.2025.106190

Ricardo J. Pimentel , Pedro Callapez , Fernando Barroso-Barcenilla , Mélani Berrocal-Casero , Vanda Faria Santos

A collection of 123 non-spiral vertebrate coprolites collected in the Tentúgal Formation from the middle Cenomanian, near Casais dos Carecos (Coimbra, west-central Portugal) is classified into eight different morphotypes (A to H) based on their morphology, size, poles shape, structure, and surface texture. The coprolites are autochthonous or parautochthonous, usually well-preserved without signs of abrasion or significant deformation. Each displays a uniform colouration, with hues ranging smoothly from yellow to reddish-yellow across the assemblage, and show low prevalence of surface traces, reflecting fast burial and a fossilization process under consistent environmental conditions. The calcium-phosphate composition of the coprolites, along with the presence of macro inclusions of bone elements in some specimens, indicates that they were produced by carnivores. The larger coprolites with circumferential constriction could be related to the crocodylomorphs. Other possible producers were marine squamates and teleosts. This study provides more insights into the Cretaceous marine and marginal marine ecosystems of the Aptian-Turonian West Portuguese Carbonate Platform, contributing to our understanding of the palaeoenvironmental conditions and food web interactions within this shallow epicontinental sea from the south European branch of the Tethyan realm.

在葡萄牙中西部科英布拉Casais dos Carecos附近的Tentúgal组收集了123件非螺旋脊椎动物粪化石，根据它们的形态、大小、极点形状、结构和表面纹理，将它们分为8种不同的形态类型（A到H）。粪化石是原生或准原生的，通常保存完好，没有磨损或明显变形的迹象。每一个都显示出统一的颜色，在整个组合中，从黄色到红黄色的色调平滑地变化，并且显示出低流行的表面痕迹，反映了在一致的环境条件下快速埋葬和石化过程。粪化石的磷酸钙组成，以及一些标本中骨骼元素的宏观包裹体的存在，表明它们是由食肉动物产生的。具有周向收缩的较大粪化石可能与鳄鱼类有关。其他可能的生产者是海洋鳞片动物和硬骨鱼。这项研究提供了更多关于阿普提安-图尔onian西葡萄牙碳酸盐岩台地的白垩纪海洋和边缘海洋生态系统的见解，有助于我们了解来自特提斯王国南欧分支的浅陆表海的古环境条件和食物网相互作用。

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引用次数: 0

The potential of fossil primary feather in taxonomic and ecological prediction 原始羽毛化石在分类学和生态学预测中的潜力

IF 1.9 3区地球科学 Q1 GEOLOGY

Cretaceous Research

Pub Date : 2025-06-13 DOI: 10.1016/j.cretres.2025.106191

Jing Zhang , Baoxia Du , Jing Peng , Yiqiao Fu , Mingzhen Zhang , Jingjing Cai , Mingyang Wei , Aijing Li

Feathers, shaped by the interplay of phylogenetic factors and environmental behaviors, serve not only as critical indicators for avian classification but also as carriers of information regarding flight patterns and ecological habitats. Although isolated fossil feathers are frequently undervalued due to the lack of direct skeletal associations, their well-preserved outline and microstructure can provide critical insights into key issues such as feather evolution, the origin of flight behavior, and taxonomic diversity. In this study, we discovered an exceptionally well-preserved distal primary feather from the Lower Cretaceous in the Jiuquan Basin of northwest China. We extracted the morphological outlines of modern primary feathers for elliptic Fourier analysis and combined microstructural data to test whether feather morphology can be used to distinguish taxonomic groups, orders, and habitats. The results indicate that the flight feather morphology in modern birds is predominantly shaped by flight-related adaptations, with significant morphospace differentiation across flight types and taxonomic orders, while habitat exerts minimal influence on feather architecture. Furthermore, multivariate statistical analyses that incorporate fossil data into modern datasets suggest that the primary feather fossil occupies a morphospace position associated with terrestrial ecological and flight mode similar to that of modern passerine type, indicating a potential association between the fossil feather and enantiornithines. However, accurate identification of fossil feather information requires expanded fossil data collection to uncover further insights embedded within the fossilized feathers.

羽毛是由系统发育因素和环境行为共同作用形成的，不仅是鸟类分类的重要指标，而且是鸟类飞行模式和生态栖息地信息的载体。尽管由于缺乏直接的骨骼关联，孤立的羽毛化石经常被低估，但它们保存完好的轮廓和微观结构可以为羽毛进化、飞行行为的起源和分类多样性等关键问题提供重要的见解。在这项研究中，我们在中国西北部的酒泉盆地发现了一根保存异常完好的下白垩统远端原生羽毛。我们提取了现代初生羽毛的形态轮廓进行椭圆傅里叶分析，并结合微观结构数据来测试羽毛形态是否可以用于区分分类类群、目和栖息地。结果表明，现代鸟类的飞行羽毛形态主要受飞行相关适应的影响，在不同的飞行类型和分类目之间存在显著的形态空间差异，而栖息地对羽毛结构的影响很小。此外，将化石数据纳入现代数据集的多元统计分析表明，原始羽毛化石在陆地生态和飞行模式方面占据的形态空间位置与现代雀鸟类型相似，表明化石羽毛与对鸟目之间存在潜在的联系。然而，准确识别化石羽毛信息需要扩大化石数据收集，以揭示化石羽毛中更深层次的见解。

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引用次数: 0

First dinosaur remains from Serbia: Sauropod and theropod material from the uppermost Cretaceous (Maastrichtian) of Osmakovo 来自塞尔维亚的第一具恐龙遗骸：来自奥斯马科沃白垩纪晚期（马斯特里赫特）的蜥脚类恐龙和兽脚亚目恐龙化石

IF 1.9 3区地球科学 Q1 GEOLOGY

Cretaceous Research

Pub Date : 2025-06-06 DOI: 10.1016/j.cretres.2025.106177

Zoran Marković , Miloš Milivojević , Richard J. Butler , Paul M. Barrett , Simon Wills , Andrew A. van de Weerd , Wilma Wessels , Predrag Radović

Diverse and abundant continental vertebrate assemblages are known from the Upper Cretaceous (Campanian–Maastrichtian) of several European countries. They formed on an island archipelago and are marked by their distinctive combination of unusual endemic groups and immigrants from North America, Asia and Gondwana. Although dinosaur fossils have been described from nearby Bulgaria, body fossils of continental vertebrates were previously unknown from the Mesozoic of Serbia. Here, we describe the dinosaurian component of a new vertebrate assemblage from the uppermost Cretaceous (Maastrichtian) of Osmakovo in southeastern Serbia. A single larger bone represents the partial left ulna of a sauropod dinosaur. Its anatomy is suggestive of titanosaurian affinities, although it appears distinct from the titanosaurs Magyarosaurus and Petrustitan from the Maastrichtian of Romania. The small size of this element may indicate its juvenile nature or that it represents an island dwarf similar to Magyarosaurus, but distinguishing these possibilities will require histological work. Sixteen isolated theropod teeth, some incomplete, were recovered by screenwashing and studied using comparative anatomy and machine learning analysis. Nine of these teeth are referred to Dromaeosauridae based on both approaches. Three teeth that are strongly recurved and lack serrations were identified as Aves by machine learning but might alternatively represent dromaeosaurid premaxillary teeth and are thus referred to Paraves. The remaining teeth comprise one specimen of the enigmatic Paronychodon and three too poorly preserved to identify beyond Theropoda. This assemblage shows similarities to contemporaneous assemblages from Romania and suggests the potential for further discoveries in the Mesozoic of Serbia.

在几个欧洲国家的上白垩纪（坎帕尼亚-马斯特里赫特），已知有丰富多样的大陆脊椎动物组合。它们形成于一个岛屿群岛，其特点是不同寻常的地方群体和来自北美、亚洲和冈瓦纳的移民的独特组合。虽然在附近的保加利亚发现了恐龙化石，但在塞尔维亚中生代发现的大陆脊椎动物的身体化石以前是未知的。在这里，我们描述了来自塞尔维亚东南部奥斯马科沃白垩纪晚期（马斯特里赫特）的一个新的脊椎动物组合的恐龙成分。一块较大的骨头代表了蜥脚类恐龙的部分左尺骨。它的解剖结构表明它与泰坦龙有相似之处，尽管它看起来与罗马尼亚马斯特里赫特人的Magyarosaurus和Petrustitan泰坦泰坦有所不同。这个元素的小尺寸可能表明它的幼年性质，或者它代表了类似于马yarosaurus的岛屿侏儒，但区分这些可能性需要组织学工作。16颗分离的兽脚亚目恐龙牙齿，其中一些不完整，通过筛洗和比较解剖学和机器学习分析进行研究。根据这两种方法，这些牙齿中有九颗属于驰龙科。通过机器学习，三颗强烈反折且缺乏锯齿的牙齿被识别为Aves，但也可能代表动龙的前上颌牙齿，因此被称为Paraves。剩下的牙齿包括一个神秘的副爪龙标本和三个保存得太差，无法识别兽脚目以外的物种。该组合与罗马尼亚同时期的组合相似，表明在塞尔维亚中生代有进一步发现的潜力。

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引用次数: 0

New information on the anatomy and paleobiogeographic and stratigraphic distributions of the British basal turtle Plastremys lata (Helochelydridae) based on its most complete skeleton (lower Albian, Spain) 基于最完整骨架的英国底龟lata Plastremys （Helochelydridae）解剖学、古地理和地层分布的新资料（西班牙Albian下游）

IF 1.9 3区地球科学 Q1 GEOLOGY

Cretaceous Research

Pub Date : 2025-06-06 DOI: 10.1016/j.cretres.2025.106179

A. Pérez-García , E. Espílez , L. Mampel , A. Cobos

The synchronous and sympatric presence of two helochelydrids is reported here for the first time for the Spanish Municipality of Ariño (Teruel Province), where the most complete skeletons from that group had been found for the European record. The presence of two members of this lineage of basal turtles has been documented in very few localities worldwide, and until now consisted of isolated and fragmented remains. Although the lower Albian Aragochersis lignitesta is exclusively documented in this Spanish paleontological area, the new material from Ariño is identified as the oldest occurrence for the British Plastremys lata, extending the paleobiogeographic distribution range for that taxon. The new fossils include a partial skeleton, as well as isolated remains of several individuals. Their analysis not only shows intraspecific variability, but also documents several anatomical elements previously unknown for Plastremys lata, which was only known from shell remains. Furthermore, the status of the first Mesozoic turtle taxon defined for the Spanish record (i.e., the hitherto problematic ‘Trachyaspis turbulensis’, also from the lower Albian of Teruel) is examined and its holotype, whose original anatomical attribution is here revised, is reattributed to Plastremys lata.

在西班牙Ariño市（特鲁埃尔省）首次报道了两种helochelydrids的同步和同域存在，在那里发现了欧洲记录中最完整的该群体骨骼。这种基龟谱系的两个成员的存在在世界上很少的地方被记录下来，直到现在还由孤立和碎片化的遗骸组成。虽然低级Albian Aragochersis lignitesta仅在西班牙古生物学区域被记录在案，但来自Ariño的新材料被确定为英国Plastremys lata最古老的发现，扩大了该分类单元的古生物地理分布范围。新发现的化石包括部分骨架，以及几个个体的孤立遗骸。他们的分析不仅显示了种内变异性，而且还记录了一些以前不知道的lata Plastremys的解剖学元素，这些元素只从贝壳遗骸中知道。此外，研究了西班牙记录中定义的第一个中生代海龟分类群的地位（即迄今为止有问题的“Trachyaspis turbulensis”，也来自Teruel的下Albian），并对其完整型（其原始解剖归属在这里进行了修订）重新归属于Plastremys lata。

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引用次数: 0

A new armored crocodyliform from the Upper Cretaceous of Catalonia (Spain): new insight into the evolution of the eusuchian postcranial and dermal skeleton 西班牙加泰隆尼亚上白垩纪新发现的一种带甲鳄鱼形：对尤苏奇动物颅后和真皮骨骼进化的新认识

IF 1.9 3区地球科学 Q1 GEOLOGY

Cretaceous Research

Pub Date : 2025-06-06 DOI: 10.1016/j.cretres.2025.106178

Francesco Della Giustina , Riccardo Rocchi , Bernat Vila

The origin and early radiation of Crocodylia have shifted attention to the Upper Cretaceous of Europe, where numerous new taxa have recently been discovered. Particularly abundant are the remains associated with allodaposuchids, a controversial and recently established eusuchian clade whose postcranial record is rarely documented. Here, we describe a new allodaposuchid specimen from the Fontllonga-6 fossil locality (Àger Basin, NE Spain) in the Fontllonga Group (lower upper Maastrichtian). The specimen consists of cranial, postcranial, and dermal skeleton remains, making it the most complete crocodyliform from the Upper Cretaceous of Europe. It exhibits massive vertebrae and a large ribcage, while the numerous recovered osteoderms show diverse morphologies, providing insight into their position within the dermal skeleton. It presents peculiar teeth ornamentation only observed in Allodaposuchus palustris in the Ibero-Armorican domain. However, confident taxonomic assignment remains challenging due to the lack of other diagnostic traits. Including anatomical information provided by the specimen in phylogenetic analyses underscores the significance of postcranial characters in reconstructing relationships within Eusuchia. This new finding fills a data gap in the postcranial anatomy of eusuchians and allodaposuchids, offering insights into the ecology of this successful clade from the Upper Cretaceous of Europe.

鳄鱼类的起源和早期辐射已经将人们的注意力转移到了欧洲的上白垩纪，在那里最近发现了许多新的分类群。特别丰富的是与异足类相关的遗骸，异足类是一个有争议的新近建立的真足类分支，其颅后记录很少被记录。在此，我们描述了来自Fontllonga群（lower upper Maastrichtian）中Fontllonga-6化石位置（Àger Basin, NE Spain）的一种新的异源类动物标本。该标本由颅骨、颅骨后和真皮骨架遗骸组成，使其成为欧洲上白垩纪最完整的鳄鱼形。它展示了巨大的椎骨和巨大的胸腔，而许多恢复的骨皮显示出不同的形态，提供了对它们在真皮骨骼中的位置的见解。它具有独特的牙齿纹饰，仅在伊比利亚-阿莫里亚地区的Allodaposuchus palustris中观察到。然而，由于缺乏其他诊断特征，自信的分类分配仍然具有挑战性。在系统发育分析中包含标本提供的解剖学信息，强调了颅后特征在重建乌苏奇动物关系中的重要性。这一新发现填补了真足类和异足类后颅解剖学的数据空白，为了解这一来自欧洲上白垩纪的成功进化分支的生态学提供了新的见解。

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引用次数: 0

A new theropod dinosaur lek in the Cretaceous Dakota Sandstone (Dinosaur Ridge, Colorado, USA) 美国科罗拉多州达科他砂岩（dinosaur Ridge, Colorado， USA）中一新的兽脚亚目恐龙化石

IF 1.9 3区地球科学 Q1 GEOLOGY

Cretaceous Research

Pub Date : 2025-06-04 DOI: 10.1016/j.cretres.2025.106176

Rogers C.C. Buntin , Tom Moklestad , Neffra A. Matthews , Brent Breithaupt , Paul C. Murphey , Ian Kapinos , Nora Noffke

High-resolution aerial imagery captured by drones document new non-avian theropod mating display scrapes (Ostendichnus) along two stratigraphic levels of the Upper Cretaceous (Cenomanian) Dakota Sandstone at Dinosaur Ridge, Colorado, USA. We describe and identify their morphologies, orientations, and patterns of clustering that include overprinting. Twenty-five additional scrapes are documented on 2 stratigraphic surfaces (24 on surface 2b, colloquially the “Dinosaur Courtship” surface; and 1 on surface 2h). The additional scrapes on surface 2b elevates its status to a fossilized nest display arena or lek. Most of the scrapes have the diagnostic “bilobate” shape, but some are bowl-shaped consistent with the description of Ostendichnus-like traces and contain well-detectable toe claw marks in all but one of the structures. A new means to determine the direction the trace maker faced while creating the scrapes (azimuth) is proposed for Ostendichnus lacking footprints, anterior divergence of claw marks, posterior tapering of troughs, and a sand crescent pile of excavated sediment at the posterior of the trace. Analysis of the Dinosaur Ridge sites and of 3 previously known lek sites in western Colorado—Club Gulch (n = 2) and Roubideau Creek— permit insight into the social behavior of the trace making theropods by comparisons to modern avian analogs, particularly those of lekking, nest scrape display, a combined nest building and display activity, and nest building that involves digging, and― in some cases― reconfiguration using available materials.

无人机拍摄的高分辨率航空图像记录了美国科罗拉多州恐龙岭上白垩纪（Cenomanian）达科他砂岩的两个地层水平上新的非鸟类兽脚亚目兽脚亚目交配展示痕（Ostendichnus）。我们描述并识别它们的形态、方向和包括套印在内的聚类模式。另外25个刮痕记录在2个地层面上(24个在2b面，俗称“恐龙求偶”面；一个在2h面上。2b表面上的额外刮痕将其地位提升为化石鸟巢展示场所或lek。大多数刮痕具有诊断性的“双叶状”形状，但也有一些是碗状的，与ostendichnus类痕迹的描述一致，并且在除一个结构外的所有结构中都含有可检测到的趾爪痕迹。本文提出了一种新的方法来确定痕迹制造者在制造刮痕时所面对的方向（方位角），这种方法适用于没有脚印的Ostendichnus，爪痕的前部发散，凹槽的后部逐渐变细，以及痕迹后部出土的沙新月形沉积物堆。对恐龙岭遗址和科罗拉多西部已知的三个遗址——俱乐部峡谷（n = 2）和鲁比多溪——的分析，可以通过与现代鸟类类似物的比较，深入了解兽脚亚目恐龙的社会行为，特别是那些留下痕迹的兽脚亚目恐龙，筑巢，筑巢和展示活动的结合，筑巢包括挖掘，在某些情况下，利用现有材料重新配置。

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引用次数: 0

The palynoflora from the Lower Cretaceous of Jiuquan Basin, Gansu Province, NW China, and its paleoclimate implication 酒泉盆地下白垩统孢粉植物及其古气候意义

IF 1.9 3区地球科学 Q1 GEOLOGY

Cretaceous Research

Pub Date : 2025-05-21 DOI: 10.1016/j.cretres.2025.106166

Yuan-zheng Lu , Sheng-hui Deng

The Lower Cretaceous Xinminpu Group in the Jiuquan Basin of Gansu Province is an important source rock. Many fossils have been found from the strata, such as early angiosperms, insects, birds and so on. So the Xinminpu Group is one of the hotspots in Cretaceous research. However, most previous studies focused on the outcrop sections and the upper part of the stratum. This paper mainly deals with the palynology of the lower part of the Xinminpu Group in boreholes. It is found that the content of the genus Classopollis (Cheirolepidiaceae) increases in a fluctuating manner upwards, reaching a maximum of 90 %. Considering the previous research, it is proposed that the climate change in the Jiuquan Basin during the Early Cretaceous involves two cycles, and each cycle showed a trend from warm and humid to dry and hot. The high - content zone of Classopollis in the middle - upper part of the Chijinpu Formation is compared with pre -OAE1a. The changes in the palynological assemblage of the Chijinpu Formation reveal the paleoclimate from pre - OAE1a to OAE1a.

甘肃酒泉盆地下白垩统新民堡群是重要的烃源岩。从地层中发现了许多化石，如早期被子植物、昆虫、鸟类等。因此，新民堡群是白垩纪研究的热点之一。然而，以往的研究大多集中在露头剖面和地层上部。本文主要研究了新民堡群下部钻孔孢粉学。结果表明，石竹属植物的含量呈波动上升趋势，最高可达90%。结合前人的研究，提出酒泉盆地早白垩世的气候变化涉及两个旋回，每个旋回都表现出由暖湿向干热的变化趋势。将池金堡组中上段的classopolis高含量带与前oae1a进行了比较。池金堡组孢粉组合的变化揭示了前OAE1a - OAE1a的古气候。

引用次数: 0

Carbon isotope stratigraphy for regional correlation of the Upper Jurassic–Lower Cretaceous Tetori Group in Japan 日本上侏罗统—下白垩统Tetori群区域对比的碳同位素地层学

IF 1.9 3区地球科学 Q1 GEOLOGY

Cretaceous Research

Pub Date : 2025-05-19 DOI: 10.1016/j.cretres.2025.106164

Mayuko Kamimura , Mitsuhiro Nagata , Takuto Ando , Sota Niki , Takafumi Hirata , Takashi Hasegawa

Regional correlation of non-marine strata is challenging despite its crucial importance in understanding terrestrial environmental transitions. This study applied carbon isotope stratigraphy for preliminary regional correlation of the Tetori Group, an Upper Jurassic to Lower Cretaceous shallow marine and non-marine siliciclastic succession in west-central Japan. To strengthen credibility for this correlation, new U–Pb zircon dating on a tuff from the Itsuki Formation provides a weighted average date of 128.8 ± 1.4 Ma (Hauterivian). Three separate samples were collected from several stratigraphic horizons within the Tetori Group. Their organic carbon isotope ratio (δ¹³C_org) was determined to assess the horizontal variation of the values. The stratigraphic fluctuation of organic carbon within the Tamodani and Itoshirogawa logging road sections ranged within ca. −25.5 to −19.5 ‰. A notable character in the obtained δ¹³C_org curves is the large values exceeding ca. −22 to −20 ‰ in the upper parts of both sections, coupled with underlying low values of ca. −25 ‰ in the middle parts of both sections. The Hauterivian long-term negative excursion and the positive excursion associated with OAE1a in the Aptian are plausible events potentially correlated to these sections. These isotopic curves were compared with those from other regions of Asia, and it is noted that the −20 to −22 ‰ positive excursion related to the OAE1a can be correlated directly with other Asian sections. This study serves as a benchmark, showcasing the potential for regional correlation within the Tetori Group using carbon isotope stratigraphy.

非海相地层的区域对比对理解陆地环境变化具有重要意义，但仍具有挑战性。应用碳同位素地层学对日本中西部地区上侏罗统—下白垩统Tetori群进行了初步的区域对比。为了加强这一对比的可信度，新的U-Pb锆石定年结果显示，来自伊月组的凝灰岩的加权平均年代为128.8±1.4 Ma （Hauterivian）。三个不同的样品是在鸟居群的几个地层中收集的。测定其有机碳同位素比值（δ13Corg），评价其水平变化。Tamodani和Itoshirogawa伐木路段有机碳的地层波动范围在- 25.5 ~ - 19.5‰之间。得到的δ13Corg曲线有一个显著的特征，即在两剖面的上部均有较大的δ13Corg值，超过−22 ~−20‰，而在两剖面的中部则有较大的δ13Corg值，约为−25‰。在阿普提亚，与OAE1a相关的Hauterivian长期负偏移和正偏移可能与这些剖面相关。将这些同位素曲线与亚洲其他地区的同位素曲线进行比较，发现与OAE1a有关的- 20 ~ - 22‰正偏移可以与亚洲其他剖面直接相关。该研究可作为一个基准，展示了利用碳同位素地层学在Tetori群内进行区域对比的潜力。

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