Cretaceous Research最新文献

{"title":"Upper Cretaceous sauropod dinosaur tracks, palaeosols, and sedimentary deposits - Bauru Group, southeastern Brazil","authors":"Emerson Ferreira de Oliveira ,&nbsp;Silvina de Valais ,&nbsp;Alessandro Batezelli ,&nbsp;Carlos Roberto Candeiro","doi":"10.1016/j.cretres.2024.106017","DOIUrl":"10.1016/j.cretres.2024.106017","url":null,"abstract":"<div><div>The Upper Cretaceous period is known in international literature for its rich diversity of terrestrial life. There is a lot of research on sedimentary deposits and the preservation of vertebrate and invertebrate fossils therein. Another essential data contribution to scientific research is the diagnostic characteristics of palaeosol profiles, such as horizons, structures, and root traces. This research found records of palaeosols, sedimentary deposits, and dinosaur tracks in a single outcrop. The palaeosols were analysed based on macro and micromorphological data. They have Bt and C horizons, and it was possible to reconstruct the pedosedimentary development of composite palaeosols. Facies analysis and interpretation of the depositional environment were carried out to identify and interpret the sediments. These are parallel bedding sedimentary structures with alternation of fine sand and clay. The tracks -bearing layers are tabular, parallel bedding sedimentary structures with fine sand and clay alternation. The tracks in the field were identified according to width, depth, morphology, and dimension, so it was possible to define the moulds and casts. At least nineteen concave structures in four different layers were interpreted as cross-sections of dinosaur tracks, with some preserved at the top of the analysed outcrop. Dinosaur tracks depend on specific conditions to be preserved in the geological record, such as plasticity and consistency of the sediments and the depositional environment. Another series of factors must also be considered, such as how and why these animals came to this place. The palaeosols indicate topographic stability for a period sufficient for the pedogenesis process, while the parallel beddings preserved at the top of the section represent instability of the relief with insufficient time for soil development. Thus, the plasticity in the sediments made it possible to record the tracks. This research contributes to the palaeoecological and environmental reconstruction of the landscape through the use of palaeosols, sediments, and dinosaur tracks records.</div></div>","PeriodicalId":55207,"journal":{"name":"Cretaceous Research","volume":"166 ","pages":"Article 106017"},"PeriodicalIF":1.9,"publicationDate":"2024-10-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142440967","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}

{"title":"New evidence of the global distribution of the swordfish-like pachycormid Protosphyraena in the late Early Cretaceous and a review of global records of the genus","authors":"Alina Kanarkina ,&nbsp;Nikolay Zverkov ,&nbsp;Irina Polyakova","doi":"10.1016/j.cretres.2024.106019","DOIUrl":"10.1016/j.cretres.2024.106019","url":null,"abstract":"<div><div><em>Protosphyraena</em> is one of the most widespread Cretaceous actinopterygian genera, with numerous species described primarily from the Upper Cretaceous of North America and Western Europe. However, most of the species are known from fragmentary and anatomically non-overlapping material, making the alpha taxonomy of this genus extremely problematic. Here we describe the first finds of <em>Protosphyraena</em> from the Albian of the Caucasus, and reassess the historical specimens from the Cenomanian of the Kursk Region of Russia. In an attempt to assign Russian specimens to a particular species, we review the global records and tangled taxonomy of <em>Protosphyraena</em>. The type species, <em>P</em>. <em>ferox</em>, is unambiguously known from teeth, cranial fragments and mandibles. The posteriorly directed rostral teeth of the type species cast doubt on the validity of <em>Australopachycormus</em> originally erected based on this feature. Our observations support the assignments of the historical Russian Cenomanian specimens to <em>P. ferox</em> and <em>P. tenuirostris</em>. We do not find sufficient cause to refer all isolated fins from Europe to <em>P. ferox</em>, as suggested by recent research. Instead, the species initially proposed by Agassiz for isolated fins from the English Chalk are available, and the fins of <em>Protosphyraena</em> from the Caucasus are consistent with one of these species, <em>Protosphyraena gibberula</em> comb. nov. Our findings indicate that <em>Protosphyraena</em> was widespread already in the late Early Cretaceous. Moreover, the youngest occurrence of <em>Protosphyraena</em> in Europe, a pectoral fin from the Maastrichtian of Belgium, demonstrates unique features and is thus referred to a new species, <em>Protosphyraena terminata</em> sp. nov.</div></div>","PeriodicalId":55207,"journal":{"name":"Cretaceous Research","volume":"166 ","pages":"Article 106019"},"PeriodicalIF":1.9,"publicationDate":"2024-10-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142531013","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}

{"title":"Colonisation of disturbed deltaic paleoenvironments from the Early Cretaceous (Albian): Inferences from an exceptional record of the fern Ruffordia goeppertii (Dunker) Seward from northeastern Spain","authors":"Luis M. Sender ,&nbsp;Uxue Villanueva-Amadoz ,&nbsp;Torsten Wappler ,&nbsp;José B. Diez ,&nbsp;Alberto Cobos","doi":"10.1016/j.cretres.2024.106018","DOIUrl":"10.1016/j.cretres.2024.106018","url":null,"abstract":"<div><div>Exquisitely well-preserved records of a nearly monospecific assemblage of in situ specimens in growth position of the fern <em>Ruffordia goeppertii</em> from the Albian deposits of northeastern Spain, clarify Early Cretaceous continental paleoenvironments during a key epoch of floral evolution during the Cretaceous Terrestrial Revolution. These macro and microfossils of vegetative and fertile organs are preserved in connexion with their rhizomes, and spores are retained within sporangia. This assemblage contains the first records of this iconic Cretaceous fern from the Albian of Spain. The fossils also fill a temporal and geographical gap in the distribution of this taxon in southwestern Eurasia during an interval of rapid floristic and faunal changes, globally. The biostratinomy of these fossils aid reconstruction of the paleoenvironments in which this type of ferns developed, and indicates that disturbed deltaic floodplains were colonised by <em>Ruffordia</em> in southwestern Eurasia during the Albian. Moreover, the presence of plant-insect interaction traces on this fern and the relationship of this plan fossil assemblage with evidence of herbivorous dinosaur tracks provides insights into the possible feeding strategies of these animals in deltaic-estuarine environments during the late Early Cretaceous in southwestern Eurasia.</div></div>","PeriodicalId":55207,"journal":{"name":"Cretaceous Research","volume":"166 ","pages":"Article 106018"},"PeriodicalIF":1.9,"publicationDate":"2024-10-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142446810","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}

{"title":"Sedimentary organic matter and paleoenvironmental reconstruction of the Santana Group (Lower Cretaceous), Araripe Basin, Northeast Brazil","authors":"Juan David Vallejo ,&nbsp;Regina Buarque de Gusmão ,&nbsp;Marcelo de Araujo Carvalho ,&nbsp;Claus Fallgatter ,&nbsp;Enelise Katia Piovesan","doi":"10.1016/j.cretres.2024.106016","DOIUrl":"10.1016/j.cretres.2024.106016","url":null,"abstract":"<div><div>Depositional controls of the Santana Group in the Araripe Basin are still being debated. The main controversial subject is their marine influence and paleoenvironmental evolution. In this study, palynofacies analysis was performed on 59 samples from one core drilled at Sítio Romualdo in the Araripe Basin to investigate sedimentary organic matter. Three palynofacies associations (structureless, continental particles, and aquatic + opaque) were identified. The Santana Group consist of Barbalha, Crato, Ipubi and Romualdo formations. Based on palynofacies associations we conclude that the depositional setting of the Barbalha Formation reflects a fluvially-fed lacustrine system under oxic conditions. The Crato Formation, associated with tidal flats, coastal lakes, and lagoons within an open bay environment, represents a bayhead delta system. The Ipubi Formation corresponds to a coastal plain typical of sabkha paleoenvironments, characterized by low energy under reducing conditions, during drier climate conditions. The Romualdo Formation records mainly an estuarine paleoenvironment characterized by dysoxic to anoxic conditions. The presence of palynomorph groups typifies a late Aptian age for the Santana Group, which is based on the range of guide species marked mainly by the presence of <em>Sergipea variverrucata</em> biozone (P-270), as well as the occurrence of <em>Complicatisaccus cearensis</em> and <em>Equisetosporites maculosus</em>. The identification of marine palynomorphs (dinoflagellate cysts <em>Subtilisphaera</em> and foraminiferal test linings) are indicative of several, local marine incursions.</div></div>","PeriodicalId":55207,"journal":{"name":"Cretaceous Research","volume":"166 ","pages":"Article 106016"},"PeriodicalIF":1.9,"publicationDate":"2024-10-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142441041","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}

{"title":"A new ornithocheirid pterosaur (Pterosauria: Ornithocheiridae) from the mid-Cretaceous Ifezouane Formation, Kem Kem Group of Morocco","authors":"Megan L. Jacobs ,&nbsp;Roy E. Smith ,&nbsp;Samir Zouhri","doi":"10.1016/j.cretres.2024.106015","DOIUrl":"10.1016/j.cretres.2024.106015","url":null,"abstract":"<div><div>A new ornithocheirid pterosaur, <em>Akharhynchus martilli</em> gen. et. sp. nov. from the Ifezouane Formation, Kem Kem Group of Morocco is described, based on a well-preserved anterior rostrum fragment. It is assigned to a new genus based on one autapomorphy and a unique combination of synapomorphies, including the following: the medial rims of the first alveoli pair contact each other and the first alveoli pair are 50% smaller than the second alveoli pair. Comparative anatomy and a phylogenetic analysis demonstrate that <em>Akharhynchus</em> has affinities with <em>Tropeognathus</em> within Tropeognathinae.</div></div>","PeriodicalId":55207,"journal":{"name":"Cretaceous Research","volume":"166 ","pages":"Article 106015"},"PeriodicalIF":1.9,"publicationDate":"2024-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142434315","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"A new gansuid bird (Avialae, Euornithes) from the Lower Cretaceous (Aptian) Jiufotang Formation of Jianchang, western Liaoning, China","authors":"Xuri Wang ,&nbsp;Andrea Cau ,&nbsp;Yinuo Wang ,&nbsp;Martin Kundrát ,&nbsp;Guili Zhang ,&nbsp;Yichuan Liu ,&nbsp;Luis M. Chiappe","doi":"10.1016/j.cretres.2024.106014","DOIUrl":"10.1016/j.cretres.2024.106014","url":null,"abstract":"<div><div>The study of the Cretaceous birds closest to the living euornithine species has mainly focused on the evolutionary patterns leading to the modern group. Yet, the morphological and ecological diversity of the euornithine branches not directly ancestral to the crown-group is probably underestimated. A new euornithine bird, <em>Shuilingornis angelai</em> gen. et sp. nov., is erected based on a nearly complete skeletal material from the Early Cretaceous (Aptian) Jehol Biota in western Liaoning, China. The new taxon is similar to the penecontemporary gansuids, yet it differs in the smaller body size and in the retention of plesiomorphic features widespread among non-gansuid euornithines. The osteohistological analysis indicates that <em>Shuilingornis</em> gen. nov. represents an early adult stage at the time of death. The phylogenetic analysis robustly supports the referral of <em>Shuilingornis</em> gen. nov. to Gansuidae. Except for the controversial <em>Hollanda</em>, the gansuids have been uncovered from four Aptian basins deposited under similar paleoclimatic conditions. Gansuid success in the middle part of the Cretaceous demonstrates that the exploration of semi-aquatic ecologies was a consistent euornithine pattern which preceded the later ornithurine radiation.</div></div>","PeriodicalId":55207,"journal":{"name":"Cretaceous Research","volume":"166 ","pages":"Article 106014"},"PeriodicalIF":1.9,"publicationDate":"2024-09-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142426923","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"A new Albian genus and species and two other new species of Umenocoleidae (Dictyoptera) from South Korea","authors":"Soo Bin Lee ,&nbsp;Gi Soo Nam ,&nbsp;André Nel ,&nbsp;Jong Kyun Park","doi":"10.1016/j.cretres.2024.106013","DOIUrl":"10.1016/j.cretres.2024.106013","url":null,"abstract":"<div><div>Since the first description from China, the Mesozoic dictyopteran family Umenocoleidae was recorded from the Eurasian and South American continents with 18 genera and 31 species. Here, we describe one new genus and three species from the Jinju Formation, South Korea: <em>Umenocoleus minimus</em> sp. nov., <em>Pseudoblattapterix weoni</em> gen. et sp. nov., and <em>Petropterix koreaensis</em> sp. nov. We also discuss three new apomorphies of the Umenocoleidae and Alienopteridae, which are 1) M, Cu and PCu1 veins form an common vein near wing base, 2) M, Cu and PCu1 veins appress to R vein and 3) CuP + PCu1 vein are not as concave as in the other Holopandictyoptera (total group of extant Blattodea and Mantodea). On the basis of these new apomorphies, we support the inclusion of the family Alienopteridae into the superfamily Umenocoleoidea. We also support the exclusions of the genera <em>Vitisma</em> and <em>Permoponopterix</em> from the Umenocoleidae family and propose to transfer the genus <em>Permoponopterix</em> into the Protelytroptera.</div></div>","PeriodicalId":55207,"journal":{"name":"Cretaceous Research","volume":"166 ","pages":"Article 106013"},"PeriodicalIF":1.9,"publicationDate":"2024-09-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142426922","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}

{"title":"Detrital zircon U–Pb geochronology of the trench-fill sandstone on the Cretaceous Shimanto accretionary complex in SW Japan: Implications for provenance and igneous activity in the eastern edge of East Asia","authors":"Tetsuya Tokiwa ,&nbsp;Yusuke Shimura ,&nbsp;Hiroshi Mori","doi":"10.1016/j.cretres.2024.106012","DOIUrl":"10.1016/j.cretres.2024.106012","url":null,"abstract":"<div><div>Cretaceous igneous rocks are widely distributed in the East Asian margin, and their formation is due to the large-scale migration of igneous activity areas from the continental interior to near the subduction margin. Detrital zircon U–Pb ages of trench-fill sandstones of the Shimanto accretionary complex in the Akaishi Mountains of southwest Japan can provide information on eroded igneous rocks, and their location at the eastern edge of East Asia makes them essential for better understanding the intensity and migration of the igneous activity. As a result of the dating, the Cretaceous zircons in the trench-fill sandstones were found to increase dramatically in the middle Cretaceous and to be abundant in the Late Cretaceous. In addition, these large amounts of Cretaceous zircons were found to be derived from igneous rocks such as the Abukuma Granites and Ryoke Granites distributed in the proto-Japan arc. These results indicate that migration of igneous activity from the continental side reached the eastern edge of East Asia in the middle Cretaceous and that large-scale igneous activity continued to occur in the eastern edge of East Asia until the Late Cretaceous. Thus, the detrital zircon age spectra in trench-fill sediments provide a clear picture of the degree of igneous activity in the source area and migration of the igneous activity on active continental margins.</div></div>","PeriodicalId":55207,"journal":{"name":"Cretaceous Research","volume":"166 ","pages":"Article 106012"},"PeriodicalIF":1.9,"publicationDate":"2024-09-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142426920","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}

{"title":"A maritime location reduced palynofloral turnover and extirpation across the end Cretaceous boundary interval on the west coast of Canada","authors":"Nidhi U. Patel ,&nbsp;Sandy M.S. McLachlan ,&nbsp;Jennifer M. Galloway ,&nbsp;David R. Greenwood ,&nbsp;Vera Pospelova","doi":"10.1016/j.cretres.2024.106011","DOIUrl":"10.1016/j.cretres.2024.106011","url":null,"abstract":"<div><div>A well-preserved suite of ∼163 spore-pollen taxa from a recently discovered K/Pg interval within the maritime Oyster Bay Formation, Vancouver Island, British Columbia, Canada, reveals a pattern of floral turnover across the boundary event with local extirpations of ∼15 % of Cretaceous taxa. Along the margin of the eastern North Pacific, a shift occurred in near-coastal vegetation composition from uppermost Cretaceous diverse fern and bryophyte-dominated communities to Danian conifer-dominated forests with a fern understory. The ‘fern spore spike’ common in other K/Pg records was not detected within the sandstone to mudstone sequence. Spore-pollen assemblages preserved herein align with those of the Continental Margin floristic province. Palm pollen is noteworthy in the studied sections including <em>Arecipites</em> spp. (aff. Arecaceae), <em>Spinizonocolpites</em> spp. (aff. <em>Nypa</em>) and <em>Pandaniidites typicus</em> (aff. <em>Pandanus</em>) suggesting a warm, frost-free, sub-tropical climate prevailed across the K/Pg interval. The presence of numerous endemic spore-pollen taxa is indicative of geographic isolation from the North American Western Interior. Maritime climate buffering along the west coast of North America contributed to microrefugia permitting greater stability in terrestrial plant communities than in continental regions.</div></div>","PeriodicalId":55207,"journal":{"name":"Cretaceous Research","volume":"166 ","pages":"Article 106011"},"PeriodicalIF":1.9,"publicationDate":"2024-09-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142426921","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"First discovery of dinosaur tracks from the Lower Cretaceous Duoni Formation in eastern Tibet, China","authors":"Yangui Li ,&nbsp;He Zhao ,&nbsp;William J. Foster ,&nbsp;Yue Yu ,&nbsp;Lida Xing ,&nbsp;Qiang Ye ,&nbsp;Chuanshang Wang ,&nbsp;Huazhou Yao","doi":"10.1016/j.cretres.2024.106009","DOIUrl":"10.1016/j.cretres.2024.106009","url":null,"abstract":"<div><div>Dinosaurs are known to have been abundant and diverse in eastern Tibet, and roamed the region from the Early Jurassic to the Late Cretaceous. Even though the evidence of dinosaurs is known throughout this interval, there are still many stratigraphic gaps that lack evidence, such as the Upper Jurassic and the Lower Cretaceous successions. Here, we report a new dinosaur tracksite from the Lower Cretaceous Duoni Formation of Basu County, where 28 track-bearing surfaces were discovered, which document a flourishing dinosaur community. Of these, three track layers with a high abundance of dinosaur tracks are described here, including sauropod, ornithopod and theropod trackways. These tracks suggest a possible exchange of trackmakers between this region and with adjacent areas of East Asia. The trackmakers' size, gait, and speed were inferred. The paleoenvironment is interpreted as ephemeral lakes bordered by conifer dominated forests. Palynological analysis conducted along the Duola stratigraphic section suggests that the tracksite is Aptian-Albian (Lower Cretaceous) in age, and the paleoclimate of the Basu area was relatively warm and dry.</div></div>","PeriodicalId":55207,"journal":{"name":"Cretaceous Research","volume":"166 ","pages":"Article 106009"},"PeriodicalIF":1.9,"publicationDate":"2024-09-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142315906","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}