Cretaceous Research最新文献

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

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

{"title":"First dinosaur remains from Serbia: Sauropod and theropod material from the uppermost Cretaceous (Maastrichtian) of Osmakovo","authors":"Zoran Marković , Miloš Milivojević , Richard J. Butler , Paul M. Barrett , Simon Wills , Andrew A. van de Weerd , Wilma Wessels , Predrag Radović","doi":"10.1016/j.cretres.2025.106177","DOIUrl":"10.1016/j.cretres.2025.106177","url":null,"abstract":"<div><div>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 <em>Magyarosaurus</em> and <em>Petrustitan</em> 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 <em>Magyarosaurus</em>, 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 <em>Paronychodon</em> 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.</div></div>","PeriodicalId":55207,"journal":{"name":"Cretaceous Research","volume":"176 ","pages":"Article 106177"},"PeriodicalIF":1.9,"publicationDate":"2025-06-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144307153","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

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

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

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

{"title":"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)","authors":"A. Pérez-García , E. Espílez , L. Mampel , A. Cobos","doi":"10.1016/j.cretres.2025.106179","DOIUrl":"10.1016/j.cretres.2025.106179","url":null,"abstract":"<div><div>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 <em>Aragochersis lignitesta</em> is exclusively documented in this Spanish paleontological area, the new material from Ariño is identified as the oldest occurrence for the British <em>Plastremys lata</em>, 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 <em>Plastremys lata</em>, 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 ‘<em>Trachyaspis turbulensis</em>’, also from the lower Albian of Teruel) is examined and its holotype, whose original anatomical attribution is here revised, is reattributed to <em>Plastremys lata</em>.</div></div>","PeriodicalId":55207,"journal":{"name":"Cretaceous Research","volume":"176 ","pages":"Article 106179"},"PeriodicalIF":1.9,"publicationDate":"2025-06-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144322606","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

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

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

Francesco Della Giustina , Riccardo Rocchi , Bernat Vila

{"title":"A new armored crocodyliform from the Upper Cretaceous of Catalonia (Spain): new insight into the evolution of the eusuchian postcranial and dermal skeleton","authors":"Francesco Della Giustina , Riccardo Rocchi , Bernat Vila","doi":"10.1016/j.cretres.2025.106178","DOIUrl":"10.1016/j.cretres.2025.106178","url":null,"abstract":"<div><div>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 <em>Allodaposuchus palustris</em> in the Ibero-Armorican domain<em>.</em> 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.</div></div>","PeriodicalId":55207,"journal":{"name":"Cretaceous Research","volume":"176 ","pages":"Article 106178"},"PeriodicalIF":1.9,"publicationDate":"2025-06-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144307230","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

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

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

{"title":"A new theropod dinosaur lek in the Cretaceous Dakota Sandstone (Dinosaur Ridge, Colorado, USA)","authors":"Rogers C.C. Buntin , Tom Moklestad , Neffra A. Matthews , Brent Breithaupt , Paul C. Murphey , Ian Kapinos , Nora Noffke","doi":"10.1016/j.cretres.2025.106176","DOIUrl":"10.1016/j.cretres.2025.106176","url":null,"abstract":"<div><div>High-resolution aerial imagery captured by drones document new non-avian theropod mating display scrapes (<em>Ostendichnus</em>) 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 <em>Ostendichnus</em>-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 <em>Ostendichnus</em> 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 (<em>n</em> = 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.</div></div>","PeriodicalId":55207,"journal":{"name":"Cretaceous Research","volume":"176 ","pages":"Article 106176"},"PeriodicalIF":1.9,"publicationDate":"2025-06-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144280325","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

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

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

Yuan-zheng Lu , Sheng-hui Deng

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

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

{"title":"Carbon isotope stratigraphy for regional correlation of the Upper Jurassic–Lower Cretaceous Tetori Group in Japan","authors":"Mayuko Kamimura , Mitsuhiro Nagata , Takuto Ando , Sota Niki , Takafumi Hirata , Takashi Hasegawa","doi":"10.1016/j.cretres.2025.106164","DOIUrl":"10.1016/j.cretres.2025.106164","url":null,"abstract":"<div><div>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 (δ<sup>13</sup>C<sub>org)</sub> 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 <em>ca.</em> −25.5 to −19.5 ‰. A notable character in the obtained δ<sup>13</sup>C<sub>org</sub> curves is the large values exceeding <em>ca.</em> −22 to −20 ‰ in the upper parts of both sections, coupled with underlying low values of <em>ca.</em> −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.</div></div>","PeriodicalId":55207,"journal":{"name":"Cretaceous Research","volume":"175 ","pages":"Article 106164"},"PeriodicalIF":1.9,"publicationDate":"2025-05-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144177771","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

A carcharodontosaurid tooth from “Boca de Forno” Ravine of the Itapecuru Formation, Parnaíba Basin, Maranhão, Brazil 巴西maranh<e:1> Parnaíba盆地Itapecuru组“Boca de Forno”峡谷中的一颗齿龙

IF 1.9 3区地球科学

Cretaceous Research Pub Date : 2025-05-13 DOI: 10.1016/j.cretres.2025.106163

Tainá Constância de França , Natan Santos Brilhante , Rafael Delcourt , João Lucas da Silva , Christophe Hendrickx , Manuel Alfredo Medeiros , Fabiana Rodrigues Costa

{"title":"A carcharodontosaurid tooth from “Boca de Forno” Ravine of the Itapecuru Formation, Parnaíba Basin, Maranhão, Brazil","authors":"Tainá Constância de França , Natan Santos Brilhante , Rafael Delcourt , João Lucas da Silva , Christophe Hendrickx , Manuel Alfredo Medeiros , Fabiana Rodrigues Costa","doi":"10.1016/j.cretres.2025.106163","DOIUrl":"10.1016/j.cretres.2025.106163","url":null,"abstract":"<div><div>Carcharodontosauridae forms a clade of medium-to very large-sized (6–14 m long) allosauroid theropods mostly restricted to the Early and mid-Cretaceous with an almost global distribution, and characterized by deep and narrow ornamented skulls and strongly compressed ziphodont teeth. In Brazil, the carcharodontosaurid fossil record is limited to shed teeth and isolated postcranial elements from the Aptian-Cenomanian deposits of the eastern part of the country. Here we describe and identify a shed tooth from a little-known outcrop of the Early Cretaceous (Aptian-Albian) Itapecuru Formation of the Maranhão State, northeastern Brazil. Although some teeth have already been reported from the Aptian-Albian deposits of this unit, this specimen represents the first isolated dental material from the Parnaíba Basin that can be confidently assigned to a carcharodontosaurid through cladistic and morphometric techniques, but also based on a systematic study. The results of the herein conducted study suggest that the specimen belongs to a carcharodontosaurine closely related to the Patagonian taxa <em>Giganotosaurus</em> and <em>Mapusaurus</em>, which are younger in age. Although the specimen is closely related to the abovementioned Patagonian taxa, the faunal composition of the Parnaíba Basin seems to be more similar to that of North Africa. Nevertheless, further collecting efforts are needed in these localities to find skeletal carcharodontosaurid remains and to broaden the comparative base for the identification of theropod dentition.</div></div>","PeriodicalId":55207,"journal":{"name":"Cretaceous Research","volume":"175 ","pages":"Article 106163"},"PeriodicalIF":1.9,"publicationDate":"2025-05-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144168486","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Evidence of piscivorous diet in an enantiornithine bird from the Lower Cretaceous of Brazil 巴西下白垩纪一种反鸟目鸟类的食鱼证据

IF 1.9 3区地球科学

Cretaceous Research Pub Date : 2025-05-13 DOI: 10.1016/j.cretres.2025.106161

Fernando Luiz Kilesse Salgado , Luis M. Chiappe , Reiner Neumann , Ismar de Souza Carvalho

引用次数: 0

Tides of rebirth: A stratigraphic perspective on the Lazarus effect in freshwater bivalves in the Aptian-Albian Romualdo Formation, Araripe Basin, Brazil 再生潮汐：巴西Araripe盆地Aptian-Albian Romualdo组淡水双壳类动物Lazarus效应的地层学视角

IF 1.9 3区地球科学

Cretaceous Research Pub Date : 2025-05-10 DOI: 10.1016/j.cretres.2025.106165

Marcello G. Simões , Vitor B. Guerrini , Victor R. Silva , Filipe G. Varejão , Suzana A. Matos , Mariza G. Rodrigues , Lucas V. Warren , Mario L. Assine , Franz T. Fürsich

{"title":"Tides of rebirth: A stratigraphic perspective on the Lazarus effect in freshwater bivalves in the Aptian-Albian Romualdo Formation, Araripe Basin, Brazil","authors":"Marcello G. Simões , Vitor B. Guerrini , Victor R. Silva , Filipe G. Varejão , Suzana A. Matos , Mariza G. Rodrigues , Lucas V. Warren , Mario L. Assine , Franz T. Fürsich","doi":"10.1016/j.cretres.2025.106165","DOIUrl":"10.1016/j.cretres.2025.106165","url":null,"abstract":"<div><div>The Aptian-Albian Romualdo Formation was deposited in a confined aquatic setting marked by at least three distinct marine ingression events. Most paleontological knowledge of this unit derives from the shale-dominated interval in its middle part, while fossil data from the sandstone-dominated facies in the uppermost part of the formation remain scarce. This paucity of data arises because the overlying deposits were either eroded or are currently obscured by Cenozoic gravity-flow deposits. Nonetheless, the uppermost Romualdo Formation preserves a tide-dominated delta succession, documenting the basin gradual return to continental conditions. In the Sobradinho section, a new mollusk-dominated assemblage is identified in an intraclast-supported conglomerate located ∼10 m above the upper shell bed interval. The assemblage includes bone fragments, plant remains, and marine/brackish-water mollusks. Additionally, freshwater bivalves, previously known only from the underlying Crato Formation, are also recorded. All macroinvertebrates exhibit a consistent preservational pattern, with infill composed of the rock matrix. Therefore, the freshwater bivalves are not reworked fossils from older sediments within the conglomerate. Their presence suggests that, for much of the Romualdo Formation depositional history, these freshwater bivalves thrived in riverine and/or low-salinity transitional or coastal environments. Without this new record, their known vertical distribution would remain largely confined to the bivalve-rich mudstones of the basal third of the Crato Formation and to a siltstone bed within a confined bay succession ∼100 m below the newly reported assemblage. This discovery significantly expands their stratigraphic range as facies-controlled Lazarus taxa.</div></div>","PeriodicalId":55207,"journal":{"name":"Cretaceous Research","volume":"175 ","pages":"Article 106165"},"PeriodicalIF":1.9,"publicationDate":"2025-05-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144106806","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Palaeoceanographic changes during the late Albian-early Turonian in the Sergipe-Alagoas Basin (Northeast Brazil) and their link with global events 巴西东北部Sergipe-Alagoas盆地albian晚期- Turonian早期古海洋学变化及其与全球事件的联系

IF 1.9 3区地球科学

Cretaceous Research Pub Date : 2025-05-08 DOI: 10.1016/j.cretres.2025.106162

Valentina Cesari , Martino Giorgioni , Igor Carrasqueira , Aristóteles de Moraes Rios-Netto , Roberto Silva Jr , Luigi Jovane

{"title":"Palaeoceanographic changes during the late Albian-early Turonian in the Sergipe-Alagoas Basin (Northeast Brazil) and their link with global events","authors":"Valentina Cesari , Martino Giorgioni , Igor Carrasqueira , Aristóteles de Moraes Rios-Netto , Roberto Silva Jr , Luigi Jovane","doi":"10.1016/j.cretres.2025.106162","DOIUrl":"10.1016/j.cretres.2025.106162","url":null,"abstract":"<div><div>The mid-Cretaceous was characterized by extreme greenhouse conditions, long-term sea level rise, and tectonic processes that influenced the dynamics of oceanic systems. The global carbon cycle was affected by major perturbations during Oceanic Anoxic Events (OAEs). We present new integrated geochemical, magnetic, and mineralogical data from a core drilled through late Albian to early Turonian sediments in the Sergipe-Alagoas Basin, off northeastern Brazil, which includes one of the few records of the OAE2 from the South Atlantic Ocean. The obtained results show a major change in sedimentation in the middle Cenomanian when mixed carbonate and siliciclastic deposits were replaced by chalk. This transition reflects a major change in palaeoceanographic conditions toward a more stable circulation mode, with better connection between the different oceanic basins, persistent currents, and bottom ventilation. Cyclicity in the ln(K/Al) record indicates insolation-driven fluctuations in aridity and humidity. A new age model, based on the stable 405 kyr-long eccentricity cycles, places the onset of the OAE2 carbon isotope excursion at ∼94.74 Ma. Sedimentation during the OAE2 seemed to be mainly controlled by long-term processes and local effects rather than global perturbations. Variations in ln(Sr/Ca) indicate increased primary productivity persisting for two long eccentricity cycles, while transient reducing conditions, inferred from loss in magnetic susceptibility compared to Fe, persisted across the earliest long eccentricity maximum phase, at least.</div></div>","PeriodicalId":55207,"journal":{"name":"Cretaceous Research","volume":"175 ","pages":"Article 106162"},"PeriodicalIF":1.9,"publicationDate":"2025-05-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144072391","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0