Cretaceous Research最新文献_第4页

Coniacian (Late Cretaceous) echinoids from the southern Tethyan shelf (NE Algeria) with remarks on their palaeobiology and palaeobiogeography 南特提斯陆架（阿尔及利亚东北部）晚白垩世锥虫目及其古生物学和古生物地理学的评述

IF 1.7 3区地球科学 Q1 GEOLOGY

Cretaceous Research

Pub Date : 2026-02-01 Epub Date: 2025-11-03 DOI: 10.1016/j.cretres.2025.106261

Nils Schlüter , Rafika Slami , Madani Benyoucef , Abdelmoumen Garah , W. James Kennedy , Ireneusz Walaszczyk

Thirteen echinoid taxa are described from Coniacian marl-limestone alternations in three sections south and east of Djebel Metlili, on the southwestern margin of the Aures Mountains in northeastern Algeria. The biostratigraphic framework, based on ammonites and inoceramids, indicates an early to middle Coniacian age. The identified taxa include: Rachiosoma rectilineatum, Phymosoma tamarinense, P. cf. P. mansour, Gomphechinus meslei, Coenholectypus subcrassus, Parapygus coquandi, Petalobrissus trigonopygus, P. rimula, Hemiaster sp., and Mecaster fourneli. Three new species are described, Orthopsis metliliae sp. nov., Coenholectypus sulcatus sp. nov. and a new genus and species referred to the family Phymosomatoidae, Triboporus luluatus gen. et sp. nov. A large amount of well-documented material, comprising 579 specimens, was collected, with the fauna being dominated by the spatangoid Mecaster fourneli. At the genus level, the fauna exhibits characteristics typical of the Tethyan realm, and includes Rachiosoma, Gomphechinus, Mecaster, Parapygus and Petalobrissus. However, at the species level, most taxa are restricted to Algeria. Some are also found in adjacent countries such as Tunisia and Egypt.

在阿尔及利亚东北部Aures山脉西南边缘Djebel Metlili以南和以东三个剖面的Coniacian泥灰岩交替中，描述了13个针孔类动物。以菊石和菊石为基础的生物地层格架表明其时代为早至中Coniacian时代。已鉴定的分类群包括：直纹Rachiosoma直纹Rachiosoma tamarinense， P. cf. P. mansour, Gomphechinus meslei, Coenholectypus subcrassus, coquandi, Petalobrissus trigonopygus， P. rimula, Hemiaster sp.和Mecaster fourneli。报告了3个新种（骨科）、3个新属（新种）和1个新属（新种）（藻科）、1个新属（新种）（三角孔虫）（三角孔虫）。收集了579个标本，其中以蛛形目Mecaster fourneli为主。在属水平上，动物群表现出典型的特提斯王国特征，包括Rachiosoma、Gomphechinus、Mecaster、Parapygus和Petalobrissus。然而，在物种水平上，大多数分类群仅限于阿尔及利亚。在突尼斯和埃及等邻近国家也发现了一些。

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引用次数: 0

Depositional system transitions and sequence stratigraphic evolution of the Tuscaloosa Group in the Mississippi Embayment, USA: Accommodation space and sediment supply controls 美国密西西比湾塔斯卡卢萨群沉积体系变迁与层序地层演化：可容纳空间与沉积物供给控制

IF 1.7 3区地球科学 Q1 GEOLOGY

Cretaceous Research

Pub Date : 2026-02-01 Epub Date: 2025-09-17 DOI: 10.1016/j.cretres.2025.106241

Husamaldeen Zubi , Brian F. Platt , Muneer Abdalla , Jennifer Gifford , Belkasim Khameiss

The Tuscaloosa Group (Grp), the basal unit of Upper Cretaceous strata in the northern Gulf of Mexico (GoM), formed during the late Cenomanian transgression across the southeastern United States. Despite its significance, comprehensive sequence stratigraphic analyses of the Tuscaloosa Grp within the south-central Mississippi Embayment (MSE) are limited. This study integrates core data, wireline logs, and field observations to characterize its depositional evolution and sequence stratigraphic architecture, delineating stratigraphic surfaces, systems tracts, and depositional sequences, and examining controlling factors. Four third-order sequences were identified from four sequence boundaries, two transgressive surfaces, and three maximum flooding surfaces. Sequence 1 (S1) includes a lowstand systems tract (LST), transgressive systems tract (TST), and highstand systems tract (HST); Sequence 2 (S2) has a TST and HST; Sequence 3 (S3) contains a LST, TST, and HST; and Sequence 4 (S4) includes a LST and TST. S1 comprises fluvial and incised valley deposits (LST), transitioned to deltaic TST during rising sea levels, and culminated in barrier island and shelf HST. S2 features distal shelf TST deposits followed by a prograding deltaic HST. S3 records a full cycle: fluvial LST, retrograding deltaic TST, and progradational deltaic HST. S4 is less developed, with fluvial LST and localized retrograding deltaic TST deposits. The Tuscaloosa's evolution was driven by accommodation space changes and sediment supply. Subsidence of the MSE in the Late Cretaceous may have increased accommodation and facilitated TST formation in the Upper Tuscaloosa. The Appalachian Highlands supplied most sediments, with the Ouachita Highlands as a secondary source.

塔斯卡卢萨群（Tuscaloosa Group, Grp）是墨西哥湾北部上白垩统地层的基础单元，形成于美国东南部的塞诺曼尼亚海侵晚期。尽管具有重要意义，但对密西西比湾中南部Tuscaloosa组的层序地层学综合分析仍然有限。本研究综合了岩心资料、电缆测井资料和野外观测资料，描述了其沉积演化和层序地层结构，圈定了地层表面、体系域和沉积层序，并研究了控制因素。从4个层序边界、2个海侵面和3个最大泛水面中识别出4个三级层序。层序1 （S1）包括低水位系统域（LST）、海侵系统域（TST）和高水位系统域（HST）；序列2 （S2）具有TST和HST；序列3 （S3）包含LST、TST和HST；序列4 （S4）包括LST和TST。S1由河流和切谷沉积（LST）组成，在海平面上升期间过渡到三角洲TST，最终形成障壁岛和陆架HST。S2的特征是陆架远端TST沉积，之后是一个推进的三角洲HST。S3记录了一个完整的周期：河流LST -退积三角洲TST -进积三角洲HST。S4发育程度较低，主要为河流型地表温度沉积和局部退积型三角洲地表温度沉积。塔斯卡卢萨河的演变是由可容纳空间的变化和沉积物的供应驱动的。晚白垩世MSE的沉降可能增加了可容纳性，促进了上塔斯卡卢萨地区TST的形成。阿巴拉契亚高地提供了大部分沉积物，瓦希托高地是次要来源。

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引用次数: 0

A new large zalambdalestid mammal from the Gobi Desert and formal stratigraphic description of the Upper Cretaceous Zos Formation 戈壁沙漠一种新的大型zalamdalestid哺乳动物和上白垩统Zos组的正式地层描述

IF 1.7 3区地球科学 Q1 GEOLOGY

Cretaceous Research

Pub Date : 2026-02-01 Epub Date: 2025-10-25 DOI: 10.1016/j.cretres.2025.106253

Michael J. Novacek , William M. Wolfe , Maureen A. O'Leary , Eric M. Roberts

We describe Zoslestes gongori, a new species of non-placental eutherian mammal from Upper Cretaceous rocks of Zos Canyon in the Nemegt Basin of the western Gobi Desert, Mongolia. Zoslestes gongori is the largest known zalambdalestid. The Zos Canyon locality, Red Rum, that yielded the specimen is adjacent to beds that have produced several extinct crocodyliforms and the ornithischian dinosaur Haya griva. We provide the first formal stratigraphic description of these fossiliferous Zos Canyon rocks by naming and describing the Zos Formation for the unit at Red Rum. The Zos Formation has a distinct set of sedimentologic associations that differentiate it from the overlying Djadokhta Formation and also has the only fauna in the Nemegt Basin older than that of the Djadokhta Formation. We consider the Zos Formation roughly comparable in age to the Javkhlant Formation of the Eastern Gobi Desert, and likely older than the Alagteeg Formation of the Ulan Nur Basin.

Zoslestes gongori is known from the holotype, a well-preserved posterior cranium, worn dentition, and fragmentary postcranial elements, and one referred specimen. The referred specimen consists of a damaged anterior skull and dentition, and a fragmentary left mandible with roots and alveoli, including an enlarged tooth resembling the elongate first lower incisor of zalambdalestids. Zoslestes shares several derived features with zalambdalestids, including the presence of a prominent entoglenoid process that, in ventral view, partly conceals the anteriorly-positioned postglenoid foramen, a large maxillary tuberosity, multiple hypoglossal foramina, a large, elongate i1 with a horizontally directed root extending deep within the mandible, lower molars with mesiodistally compressed trigonids and relatively wide talonids, a relatively large P4, and upper molars that are distinctly wider labiolingually than long mesiodistally and that are not interlocked mesiodistally. The significantly large size of Zoslestes and the large contribution of its jugal to the zygomatic process are autapomorphies distinguishing this taxon from other zalambdalestids.

本文描述了在蒙古戈壁西部Nemegt盆地Zos峡谷上白垩世岩石中发现的一种非胎盘哺乳类动物Zoslestes gonori。扁角虫是已知最大的扁角虫。在佐斯峡谷的红朗姆地区，发现了这个标本，附近的地层曾发现过几种已灭绝的鳄鱼目恐龙和鸟臀目恐龙。我们通过命名和描述在Red Rum的单位的Zos组，提供了这些化石的Zos峡谷岩石的第一个正式的地层描述。Zos组与上覆的Djadokhta组有着独特的沉积学联系，也是Nemegt盆地中唯一比Djadokhta组更古老的动物群。我们认为Zos组的年龄与东部戈壁沙漠的Javkhlant组大致相当，可能比乌兰淖尔盆地的Alagteeg组更古老。我们从完整的模型、保存完好的后颅骨、磨损的牙列、残缺的颅后器官和一个参考标本中了解到小狐猴。所提到的标本包括一个受损的前颅骨和牙列，一个带有根和牙槽的碎片左下颌骨，包括一颗类似于zalambdalestid的细长的第一下门牙的扩大的牙齿。Zoslestes与zalambdalestids有几个共同的衍生特征，包括有一个突出的盂内突，从腹侧看，它部分隐藏了位于前方的盂后孔，一个大的上颌结节，多个舌下孔，一个大的，细长的i1，一个水平方向的根延伸到下颌骨深处，下磨牙中远端压缩三角肌和相对宽的距骨，一个相对大的P4，上磨牙在唇上明显宽而在中离侧明显长并且在中离侧没有互锁。Zoslestes的巨大体型和对颧突的巨大贡献是该分类群区别于其他zalambdalestes的自形特征。

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引用次数: 0

Evidence of large pliosaurids in the late Valanginian of Colombia 哥伦比亚瓦兰吉尼亚晚期大型上龙的证据

IF 1.7 3区地球科学 Q1 GEOLOGY

Cretaceous Research

Pub Date : 2026-02-01 Epub Date: 2025-09-15 DOI: 10.1016/j.cretres.2025.106235

Javier García-Guerrero , Fredy Parra Ruge , German A. Prieto , Edwin-Alberto Cadena

The fossil record of Lower Cretaceous pliosaurids, particularly from the Valanginian is still poorly known globally, hindering efforts to reconstruct their evolution and palaeogeographical distribution within a broader time frame. Here, we describe an isolated cervical centrum (14 cm maximum diameter) of a pliosaurid belonging to a Brachaucheniinae gen. et sp. indet., from the Lower Cretaceous (upper Valanginian) Rosa Blanca Formation in Zapatoca, Colombia. The presence of large brachaucheniines in the Rosa Blanca Formation suggests that these large pliosaurids were part of the abundant and diverse fauna that inhabited the northwestern margin of Gondwana during the Early Cretaceous and extends their record in northern South America from the Barremian to the late Valanginian. These pliosaurids potentially acted as top predators in the food chain of lower latitude shallow marine environments. This discovery contributes new data to the taxonomic and chronostratigraphic framework of Early Cretaceous marine reptiles from the Proto-Caribbean domain.

下白垩纪上龙的化石记录，特别是来自Valanginian的化石记录，在全球范围内仍然知之甚少，这阻碍了在更广泛的时间框架内重建它们的进化和古地理分布的努力。在这里，我们描述了一个分离的颈椎体（最大直径14厘米），属于brachacheniinae gen. et sp. indet的上龙。来自哥伦比亚萨帕托卡的下白垩纪（上瓦兰吉尼亚）Rosa Blanca组。Rosa Blanca组中大型brachacheniines的存在表明，这些大型上龙是早白垩纪时期居住在冈瓦纳西北边缘的丰富多样的动物群的一部分，并将其在南美洲北部的记录从巴雷米亚延伸到晚瓦兰吉尼亚。这些上龙有可能成为低纬度浅海环境食物链中的顶级捕食者。这一发现为原加勒比海地区早白垩世海生爬行动物的分类和年代地层格架提供了新的数据。

引用次数: 0

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 : 2026-02-01 Epub 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

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 : 2026-02-01 Epub 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

A remarkable new genus of Symphrasinae (Neuroptera: Mantispidae) from mid-Cretaceous amber of Myanmar, and the problem of the phylogenetic affinities of Rhachiberothidae 缅甸中白垩世琥珀合蛛科新属（神经翅目：螳螂科）及其系统发育亲缘关系问题

IF 1.7 3区地球科学 Q1 GEOLOGY

Cretaceous Research

Pub Date : 2026-02-01 Epub Date: 2025-09-24 DOI: 10.1016/j.cretres.2025.106243

Vladimir N. Makarkin , Arnold H. Staniczek

Rhachisymphrasis raehlei gen. et sp. nov. (Neuroptera: Mantispidae: Symphrasinae) is described from mid-Cretaceous Kachin amber. The genus is remarkable for possessing many character states which do not occur in other Symphrasinae: the profemur is slender; the protibia is very short; the lanceolate process of the probasitarsus arises from its tip and is relatively thin; the mesotibia is strongly expanded; and the forewing CuP is shallowly forked. The protarsus of Rhachisymphrasis gen. nov. is rather similar to that of Rhachiberothidae. However, it is unclear whether Rhachiberothidae is phylogenetically closer to Mantispidae or Berothidae. The most plausible hypothesis is that Rhachiberothidae constitute an ancient branch of Mantispoidea leading to Mantispidae (including Symphrasinae), but retaining many character states of Berothidae. The symphrasine affinity of Sinomesomantispa Jepson et al., 2013 from the Lower Cretaceous of China is confirmed.

rachisymphrasis raehlei gen. et sp. 11 .（神经翅目：螳螂科：螳螂科）来自中白垩世克钦琥珀。该属的显著特点是具有许多在其他合孢科中所没有的特征状态：柱头纤细；时间很短；近跖骨的披针形突起起于其尖端，相对较薄；中胫肌强烈扩张；前杯呈浅分叉。石竹属的前跗关节与石竹科的前跗关节非常相似。然而，目前尚不清楚在系统发育上Rhachiberothidae是否更接近Mantispidae或Berothidae。最合理的假设是，尾蛛科构成了螳螂科的一个古老分支，导致了螳螂科（包括合蛛科），但保留了许多蛛科的特征状态。中国下白垩统Sinomesomantispa Jepson et al.， 2013证实了共phrasine亲和力。

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 : 2026-02-01 Epub 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

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 : 2026-02-01 Epub 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

Macrofauna and stable isotope record of the Jurassic‒Cretaceous transition at the Dedina section (Golubac, eastern Serbia) 塞尔维亚东部Golubac Dedina剖面侏罗纪-白垩纪过渡时期的大型动物群及稳定同位素记录

IF 1.7 3区地球科学 Q1 GEOLOGY

Cretaceous Research

Pub Date : 2026-02-01 Epub Date: 2025-10-15 DOI: 10.1016/j.cretres.2025.106250

Lucie Vaňková , Barbara V. Radulović , Martin Košťák , Dragoman Rabrenović , Martin Mazuch , Dejan Barjaktarović , Slađana Dušanić

The Tithonian‒Berriasian boundary interval at the Dedina section (Serbia) has been evaluated from the perspective of rare invertebrate fossils (excluding ammonites and their aptychi) and stable isotope data obtained from the bulk rock samples (δ¹³C_carb and δ¹⁸O_carb). The majority of the described benthic fauna consists of brachiopods (Lacunosella hoheneggeri, Tropeothyris tychaviensis, Svaljavithyris bilimeki and Helvetella arzierensis); additionally, a single bivalve species Camptonectes (Camptonectes) cottaldinus is present. This fauna occurs predominantly in the uppermost part of the section, corresponding to the middle Berriasian. Rare belemnites (genera Duvalia, Berriasibelus, Tithonobelus, and Hibolites) exhibit a faunal turnover around the boundary between the calpionellid Remaniella ferasini and Calpionella elliptica subzones, where the family Duvaliidae is largely replaced by Belemnopseidae. The stable carbon isotope data are consistent with previously published records from the north-western Tethys, showing typical slightly negative excursions and trends: at the base of the Calpionella alpina Subzone, within the Ferasini Subzone (a well documented negative δ¹³C_carb excursion), and a negative peak within the Elliptica Subzone. The latter may hold potential correlative value but this requires confirmation. The stable oxygen isotope data are more affected by diagenesis, but partially reflect trends observed in other sections and may therefore preserve a palaeoclimatic signal.

从稀有无脊椎动物化石（不包括菊石及其类）和块状岩石样品（δ13Ccarb和δ18Ocarb）的稳定同位素数据的角度对塞尔维亚Dedina剖面的Tithonian-Berriasian边界段进行了评价。所描述的底栖动物主要为腕足类动物（Lacunosella hoheneggeri, Tropeothyris tychaviensis， Svaljavithyris bilimeki和Helvetella arzierensis）；此外，存在单一双壳类Camptonectes (Camptonectes) cottaldinus。这种动物群主要出现在剖面的最上部，对应于贝里亚中部。稀有的蛭石属（Duvalia属，Berriasibelus属，Tithonobelus属和Hibolites属）在calpionellid Remaniella ferasini亚带和Calpionella elliptica亚带之间表现出动物群更替，其中duvalidae科大部分被Belemnopseidae取代。稳定碳同位素数据与先前发表的特提斯西北部记录一致，显示出典型的轻微负偏移和趋势：在Calpionella alpina亚带的底部，Ferasini亚带内（一个有充分记录的负δ13Ccarb偏移），以及椭圆亚带内的负峰。后者可能具有潜在的相关价值，但这需要确认。稳定氧同位素数据受成岩作用影响较大，但部分反映了其他剖面观测到的趋势，因此可能保留了古气候信号。

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引用次数: 0