Pub Date : 2025-12-01Epub Date: 2025-06-14DOI: 10.1016/j.cretres.2025.106192
Gabriel A. Casal , Karen M. Panzeri , Bruno N. Alvarez , Noelia V. Cardozo , Julieta L. Caglianone , Marcelo Luna , Lucio M. Ibiricu
Here, we describe a tooth plate (UNPSJB-PV 1047), from fluvial sandstones of the “middle section” of the Lago Colhué Huapi Formation exposed in the locality of “Playa Kruger” (Santonian?–lower Maastrichtian?), central Patagonia, Argentina. This a prearticular plate that has been assigned to the genus Metaceratodus and provisionally to the species Metaceratodus kaopen. Shared features include the presence of a lingual edge that tends to be straight and a medial edge that is slightly curved, a long first denticulation with a broad base and no deep wear facets, and an end of the first denticulation without the formation of sinuosities. However, this interpretation is not definitive given the morphological variation of tooth plates within the same species. UNPSJB-PV 1047 represents the first record of these lungfish in the Golfo San Jorge Basin, expanding the geographic distribution of this taxon in South America and contributing to interpretations of its living environment. Its presence increases biodiversity for the Lago Colhué Huapi Formation and supports interpretations of the sedimentary paleoenvironment in the “middle section” of the Lago Colhué Huapi Formation, characterized by fluvial systems that seasonally interrupted their discharge under a warm climate with dry periods, suggesting an optimal environment for the development of lungfish.
{"title":"First record of a lungfish (Sarcopterygii: Dipnoi) in the Upper Cretaceous of the Chubut Group, Golfo San Jorge Basin, Argentina. paleoenvironmental and paleoclimatic considerations","authors":"Gabriel A. Casal , Karen M. Panzeri , Bruno N. Alvarez , Noelia V. Cardozo , Julieta L. Caglianone , Marcelo Luna , Lucio M. Ibiricu","doi":"10.1016/j.cretres.2025.106192","DOIUrl":"10.1016/j.cretres.2025.106192","url":null,"abstract":"<div><div>Here, we describe a tooth plate (UNPSJB-PV 1047), from fluvial sandstones of the “middle section” of the Lago Colhué Huapi Formation exposed in the locality of “Playa Kruger” (Santonian?–lower Maastrichtian?), central Patagonia, Argentina. This a prearticular plate that has been assigned to the genus <em>Metaceratodus</em> and provisionally to the species <em>Metaceratodus kaopen</em>. Shared features include the presence of a lingual edge that tends to be straight and a medial edge that is slightly curved, a long first denticulation with a broad base and no deep wear facets, and an end of the first denticulation without the formation of sinuosities. However, this interpretation is not definitive given the morphological variation of tooth plates within the same species. UNPSJB-PV 1047 represents the first record of these lungfish in the Golfo San Jorge Basin, expanding the geographic distribution of this taxon in South America and contributing to interpretations of its living environment. Its presence increases biodiversity for the Lago Colhué Huapi Formation and supports interpretations of the sedimentary paleoenvironment in the “middle section” of the Lago Colhué Huapi Formation, characterized by fluvial systems that seasonally interrupted their discharge under a warm climate with dry periods, suggesting an optimal environment for the development of lungfish.</div></div>","PeriodicalId":55207,"journal":{"name":"Cretaceous Research","volume":"176 ","pages":"Article 106192"},"PeriodicalIF":1.9,"publicationDate":"2025-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144491866","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}
Pub Date : 2025-12-01Epub Date: 2025-06-26DOI: 10.1016/j.cretres.2025.106194
Anja Kocjančič , Maria Rose Petrizzo , Aleksander Horvat
This paper examines the 42 m thick Upper Cretaceous sedimentary succession of the Čanj section in the Budva Zone (Dinarides), Montenegro, with a focus on planktonic foraminifera and geochemical characteristics across the Santonian/Campanian boundary. The section features well-preserved red pelagic Scaglia-type limestones with occasional chert intercalations, similar to the Cretaceous Oceanic Red Beds (CORBs) observed worldwide. An integrated stratigraphic analysis, including biostratigraphy and chemostratigraphy, was conducted to identify isotopic signals and planktonic foraminiferal species that characterize this Tethyan facies, and to locate the Santonian/Campanian boundary. The lithostratigraphic framework of the section includes distinct members (RM1, RM2, and RM3), along with a notable White Member (WM) containing black chert layers. Stable isotopes (δ13Ccarb and δ18Ocarb) and elemental composition analyses on bulk carbonate samples reveal significant shifts in isotope ratios and element concentrations corresponding to lithologic transitions within the section. The occurrence of the planktonic foraminifera Dicarinella asymetrica in the WM marks an important biostratigraphic interval in the Santonian. The multiproxy approach revealed increased paleobioproductivity and a transgressive sea level phase in the WM during the Santonian in the western Tethys. Geochemical data suggest that the long-term sea-level rise was interrupted by smaller, short-term sea-level falls during the deposition of the studied pelagites. A comparative analysis with other Mediterranean CORBs and the Bottaccione section (Italy) highlights the regional significance of the Čanj sequence.
{"title":"Integrated stratigraphy and paleoceanography across the Santonian/Campanian boundary in the Budva Zone (Dinarides), Montenegro","authors":"Anja Kocjančič , Maria Rose Petrizzo , Aleksander Horvat","doi":"10.1016/j.cretres.2025.106194","DOIUrl":"10.1016/j.cretres.2025.106194","url":null,"abstract":"<div><div>This paper examines the 42 m thick Upper Cretaceous sedimentary succession of the Čanj section in the Budva Zone (Dinarides), Montenegro, with a focus on planktonic foraminifera and geochemical characteristics across the Santonian/Campanian boundary. The section features well-preserved red pelagic Scaglia-type limestones with occasional chert intercalations, similar to the Cretaceous Oceanic Red Beds (CORBs) observed worldwide. An integrated stratigraphic analysis, including biostratigraphy and chemostratigraphy, was conducted to identify isotopic signals and planktonic foraminiferal species that characterize this Tethyan facies, and to locate the Santonian/Campanian boundary. The lithostratigraphic framework of the section includes distinct members (RM1, RM2, and RM3), along with a notable White Member (WM) containing black chert layers. Stable isotopes (δ<sup>13</sup>C<sub>carb</sub> and δ<sup>18</sup>O<sub>carb</sub>) and elemental composition analyses on bulk carbonate samples reveal significant shifts in isotope ratios and element concentrations corresponding to lithologic transitions within the section. The occurrence of the planktonic foraminifera <em>Dicarinella asymetrica</em> in the WM marks an important biostratigraphic interval in the Santonian. The multiproxy approach revealed increased paleobioproductivity and a transgressive sea level phase in the WM during the Santonian in the western Tethys. Geochemical data suggest that the long-term sea-level rise was interrupted by smaller, short-term sea-level falls during the deposition of the studied pelagites. A comparative analysis with other Mediterranean CORBs and the Bottaccione section (Italy) highlights the regional significance of the Čanj sequence.</div></div>","PeriodicalId":55207,"journal":{"name":"Cretaceous Research","volume":"176 ","pages":"Article 106194"},"PeriodicalIF":1.9,"publicationDate":"2025-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144588675","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}
Pub Date : 2025-11-01Epub Date: 2025-05-13DOI: 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
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 Giganotosaurus and Mapusaurus, 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.
{"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":"2025-11-01","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}
Pub Date : 2025-11-01Epub Date: 2025-04-25DOI: 10.1016/j.cretres.2025.106148
Daisuke Aiba , Takafumi Mochizuki
We examined 47 specimens of ammonoid and inoceramid bivalves from the Cretaceous Taneichi Formation in Iwate Prefecture, northeastern Japan and assigned them to seven species of ammonoids and two species of inoceramids. Of these, five species of ammonoids, Protexanites (Anatexanites) fukazawai (Yabe and Shimizu, 1925); Eubostrychoceras valdelaxum Aiba, Yamato, Kurihara, and Karasawa, 2017; Hyphantoceras transitorium Matsumoto, 1977; Polyptychoceras yubarense (Shimizu, 1935); and Po. obatai (Matsumoto, 1977); and one species of inoceramid, Platyceramus japonicus (Nagao and Matumoto, 1940) are reported for the first time from this Formation. The inoceramid Pl. japonicus and a few biostratigraphically informative ammonoids indicate that the middle Member of the Taneichi Formation was deposited in Santonian–early Campanian (Late Cretaceous). Ammonoid species found in the Taneichi Formation were generally similar to those of the Santonian–lower Campanian in other regions of the northwestern Pacific. Heteromorph taxa were the most abundant ammonoids, accounting for approximately 70 % of the total. Additionally, it is notable that “Leiostraca” taxa, such as Tetragonitoidea and Desmoceratoidea, were not included in the examined specimens. These patterns of occurrence might suggest the palaeoecology of ammonoids, but determining whether they reflect the true distribution requires verification of taphonomic processes, such as post-mortem drifting.
摘要对日本东北部岩手县白垩纪谷一组的47个菊科双壳类和双壳类标本进行了研究，并将其归属于菊科7种和双壳类2种。其中，五种菊石，原石岩（Anatexanites） fukazawai (Yabe and Shimizu, 1925)；Eubostrychoceras valdelaxum Aiba, Yamato，栗原和Karasawa, 2017；Hyphantoceras transitorium Matsumoto, 1977；polytychoceras yubarense（清水，1935）；和阿宝。obatai（松本，1977）；该组中首次报道了一种鱼科植物Platyceramus japonicus （Nagao and Matumoto, 1940）。菊石Pl. japonicus和少量生物地层学资料表明，Taneichi组中段沉积于晚白垩世圣东—早坎帕尼亚期。在Taneichi组中发现的类氨物种与西北太平洋其他地区的圣东统-下坎帕尼亚统的类氨物种大致相似。异型类群中菊石种类最多，约占总数的70%。此外，值得注意的是，“Leiostraca”分类群，如Tetragonitoidea和Desmoceratoidea，没有包括在检查的标本中。这些发生模式可能暗示了菊石的古生态学，但要确定它们是否反映了真实的分布，需要对埋藏学过程进行验证，例如死后漂流。
{"title":"Ammonoids and inoceramid bivalves from the Upper Cretaceous shallow marine deposits of Taneichi Formation in Hirono Town, Iwate Prefecture, northeastern Japan: Implication for biostratigraphy","authors":"Daisuke Aiba , Takafumi Mochizuki","doi":"10.1016/j.cretres.2025.106148","DOIUrl":"10.1016/j.cretres.2025.106148","url":null,"abstract":"<div><div>We examined 47 specimens of ammonoid and inoceramid bivalves from the Cretaceous Taneichi Formation in Iwate Prefecture, northeastern Japan and assigned them to seven species of ammonoids and two species of inoceramids. Of these, five species of ammonoids, <em>Protexanites</em> (<em>Anatexanites</em>) <em>fukazawai</em> (Yabe and Shimizu, 1925); <em>Eubostrychoceras valdelaxum</em> Aiba, Yamato, Kurihara, and Karasawa, 2017; <em>Hyphantoceras transitorium</em> Matsumoto, 1977; <em>Polyptychoceras yubarense</em> (Shimizu, 1935); and <em>Po</em>. <em>obatai</em> (Matsumoto, 1977); and one species of inoceramid, <em>Platyceramus japonicus</em> (Nagao and Matumoto, 1940) are reported for the first time from this Formation. The inoceramid <em>Pl</em>. <em>japonicus</em> and a few biostratigraphically informative ammonoids indicate that the middle Member of the Taneichi Formation was deposited in Santonian–early Campanian (Late Cretaceous). Ammonoid species found in the Taneichi Formation were generally similar to those of the Santonian–lower Campanian in other regions of the northwestern Pacific. Heteromorph taxa were the most abundant ammonoids, accounting for approximately 70 % of the total. Additionally, it is notable that “Leiostraca” taxa, such as Tetragonitoidea and Desmoceratoidea, were not included in the examined specimens. These patterns of occurrence might suggest the palaeoecology of ammonoids, but determining whether they reflect the true distribution requires verification of taphonomic processes, such as post-mortem drifting.</div></div>","PeriodicalId":55207,"journal":{"name":"Cretaceous Research","volume":"175 ","pages":"Article 106148"},"PeriodicalIF":1.9,"publicationDate":"2025-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143911624","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}
Isolated theropod teeth are notably abundant of vertebrate remains within the Upper Jurassic to Lower Cretaceous Khorat Group of Thailand. However, despite the discovery of numerous dental materials, only a limited number of studies have focused on the morphology and taxonomy of these isolated teeth. This study investigated 112 isolated theropod teeth were retrieved from 19 localities on the Khorat Plateau in Northeastern Thailand. These teeth were divided into five morphotypes based on dental characteristics. They were identified based on cladistic and discriminant analyses that recovered four clades of theropod dinosaurs: Metriacanthosauridae, Tyrannosauroidea, Spinosauridae, and Allosauria. This dental evidence provide significant insights into the theropod diversity in Thailand during the Late Jurassic to Early Cretaceous. Specifically, the Late Jurassic to Early Cretaceous Phu Kradung Formation revealed an extended presence of metriacanthosaurids and basal tyrannosauroids, while the Sao Khua and Khok Kruat Formations indicated a shift towards allosaurian and spinosaurid dominance during the Early Cretaceous. The absence of metriacanthosaurids and basal tyrannosauroids in later formations suggests a faunal turnover, with allosaurians and spinosaurids becoming more prevalent, aligning with the changes in theropod faunal composition across Eurasia. Furthermore, this contribution suggested the faunal turnover pattern in the Eurasian theropods during the Jurassic-Cretaceous boundary interval, which might have been related to the change in herbivorous dinosaurs during this crucial timeframe of dinosaur evolution.
{"title":"Isolated theropod teeth from the Upper Jurassic to Lower Cretaceous Khorat Group: Implications for theropod diversity in Thailand","authors":"Wongwech Chowchuvech , Sita Manitkoon , Phornphen Chanthasit , Duangsuda Chokchaloemwong , Wachirawit Kosulawatha , Chatchalerm Ketwetsuriya","doi":"10.1016/j.cretres.2025.106147","DOIUrl":"10.1016/j.cretres.2025.106147","url":null,"abstract":"<div><div>Isolated theropod teeth are notably abundant of vertebrate remains within the Upper Jurassic to Lower Cretaceous Khorat Group of Thailand. However, despite the discovery of numerous dental materials, only a limited number of studies have focused on the morphology and taxonomy of these isolated teeth. This study investigated 112 isolated theropod teeth were retrieved from 19 localities on the Khorat Plateau in Northeastern Thailand. These teeth were divided into five morphotypes based on dental characteristics. They were identified based on cladistic and discriminant analyses that recovered four clades of theropod dinosaurs: Metriacanthosauridae, Tyrannosauroidea, Spinosauridae, and Allosauria. This dental evidence provide significant insights into the theropod diversity in Thailand during the Late Jurassic to Early Cretaceous. Specifically, the Late Jurassic to Early Cretaceous Phu Kradung Formation revealed an extended presence of metriacanthosaurids and basal tyrannosauroids, while the Sao Khua and Khok Kruat Formations indicated a shift towards allosaurian and spinosaurid dominance during the Early Cretaceous. The absence of metriacanthosaurids and basal tyrannosauroids in later formations suggests a faunal turnover, with allosaurians and spinosaurids becoming more prevalent, aligning with the changes in theropod faunal composition across Eurasia. Furthermore, this contribution suggested the faunal turnover pattern in the Eurasian theropods during the Jurassic-Cretaceous boundary interval, which might have been related to the change in herbivorous dinosaurs during this crucial timeframe of dinosaur evolution.</div></div>","PeriodicalId":55207,"journal":{"name":"Cretaceous Research","volume":"175 ","pages":"Article 106147"},"PeriodicalIF":1.9,"publicationDate":"2025-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143935610","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}
Pub Date : 2025-11-01Epub Date: 2025-05-02DOI: 10.1016/j.cretres.2025.106158
Marta Díez-Somolinos , Fernando Barroso-Barcenilla , Mélani Berrocal-Casero , Julio Rodríguez-Lázaro , Paloma Sevilla García , Benjamin Sames
The upper Barremian (Lower Cretaceous) palaeontological site of Vadillos-1 is located in the northern part of the province of Cuenca, Spain. It comprises a sedimentary sequence in Wealden-type facies, rich in non-marine ostracods. In these materials, species of Cypridea have been identified, in particular Cypridea isasae, characterized by its rounded cyathus, and Cypridea ventriosa, being distinguished by the subcircular outline and a large rostrum separated by a very marked alveolar notch. Additionally, numerous specimens of Cypridea vatra nov. sp., defined by its well-marked anterior cardinal angle, and Cypridea marihoni nov. sp., well defined by its ornamented carapace, have been described. Other specimens have been assigned to the genus Cyclocypris, specifically to Cyclocypris bamba nov. sp., characterized by its inflated carapace and piriform outline. These taxa are reported for the first time in the study area and are characteristic of alluvial and palustrine palaeoenvironments. This analysis provides the basis for future studies that will allow a more precise interpretation of non-marine Barremian palaeoenvironments.
{"title":"New species of ostracods from the non-marine upper Barremian (Lower Cretaceous) of Vadillos-1 (Cuenca, Spain)","authors":"Marta Díez-Somolinos , Fernando Barroso-Barcenilla , Mélani Berrocal-Casero , Julio Rodríguez-Lázaro , Paloma Sevilla García , Benjamin Sames","doi":"10.1016/j.cretres.2025.106158","DOIUrl":"10.1016/j.cretres.2025.106158","url":null,"abstract":"<div><div>The upper Barremian (Lower Cretaceous) palaeontological site of Vadillos-1 is located in the northern part of the province of Cuenca, Spain. It comprises a sedimentary sequence in Wealden-type facies, rich in non-marine ostracods. In these materials, species of <em>Cypridea</em> have been identified, in particular <em>Cypridea isasae,</em> characterized by its rounded cyathus, and <em>Cypridea ventriosa</em>, being distinguished by the subcircular outline and a large rostrum separated by a very marked alveolar notch. Additionally, numerous specimens of <em>Cypridea vatra</em> nov. sp., defined by its well-marked anterior cardinal angle, and <em>Cypridea marihoni</em> nov. sp., well defined by its ornamented carapace, have been described. Other specimens have been assigned to the genus <em>Cyclocypris</em>, specifically to <em>Cyclocypris bamba</em> nov. sp., characterized by its inflated carapace and piriform outline. These taxa are reported for the first time in the study area and are characteristic of alluvial and palustrine palaeoenvironments. This analysis provides the basis for future studies that will allow a more precise interpretation of non-marine Barremian palaeoenvironments.</div></div>","PeriodicalId":55207,"journal":{"name":"Cretaceous Research","volume":"175 ","pages":"Article 106158"},"PeriodicalIF":1.9,"publicationDate":"2025-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143947192","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}
Pub Date : 2025-11-01Epub Date: 2025-05-13DOI: 10.1016/j.cretres.2025.106161
Fernando Luiz Kilesse Salgado , Luis M. Chiappe , Reiner Neumann , Ismar de Souza Carvalho
Cratoavis cearensis, described from a single specimen unearthed from the Crato Formation of the Araripe Basin in Brazil, represents one of the earliest known fossil avians from South America (ca. 117 My). We report on the presence of disarticulated fish elements associated with the skeleton and interpret them as contained within the digestive tract of this enantiornithine bird. These bony elements are similar to ribs of Dastilbe crandalli, a fish belonging to Gonorynchiforms. Dastilbe crandalli is abundant in the same Crato deposits that have yielded Cratoavis cearensis. The identified bony elements provide direct evidence of a piscivorous diet for this Brazilian enantiornithine, thus contributing to the meager evidence available for understanding the trophic specializations of this major clade of Mesozoic birds.
{"title":"Evidence of piscivorous diet in an enantiornithine bird from the Lower Cretaceous of Brazil","authors":"Fernando Luiz Kilesse Salgado , Luis M. Chiappe , Reiner Neumann , Ismar de Souza Carvalho","doi":"10.1016/j.cretres.2025.106161","DOIUrl":"10.1016/j.cretres.2025.106161","url":null,"abstract":"<div><div><em>Cratoavis cearensis</em>, described from a single specimen unearthed from the Crato Formation of the Araripe Basin in Brazil, represents one of the earliest known fossil avians from South America (ca. 117 My). We report on the presence of disarticulated fish elements associated with the skeleton and interpret them as contained within the digestive tract of this enantiornithine bird. These bony elements are similar to ribs of <em>Dastilbe crandalli</em>, a fish belonging to Gonorynchiforms. <em>Dastilbe crandalli</em> is abundant in the same Crato deposits that have yielded <em>Cratoavis cearensis</em>. The identified bony elements provide direct evidence of a piscivorous diet for this Brazilian enantiornithine, thus contributing to the meager evidence available for understanding the trophic specializations of this major clade of Mesozoic birds.</div></div>","PeriodicalId":55207,"journal":{"name":"Cretaceous Research","volume":"175 ","pages":"Article 106161"},"PeriodicalIF":1.9,"publicationDate":"2025-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144083842","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}
Pub Date : 2025-11-01Epub Date: 2025-04-30DOI: 10.1016/j.cretres.2025.106150
Fellipe Muniz , Ariovaldo Giaretta , Thiago S. Fachini , Thiago da Silva Marinho , Pedro Buck , Sabrina Rodrigues , Agustín G. Martinelli
South America hosts one of the largest diversities of living frogs in the world, but our knowledge of the group during the Mesozoic Era is still limited. The Upper Cretaceous Bauru Group, in the south-central region of Brazil, has yielded a variety of vertebrate groups. Frog records are rare and restricted to a few well-preserved skeletons and fragmentary material. Nevertheless, they have offered important clues about the early diversification and distribution of frogs, especially among the speciose clade Neobatrachia. Here, we report new records of frogs from the Adamantina and Serra da Galga formations. The described specimens expand the geographical range of frogs in the Bauru Group and corroborate the hypothesis of a widespread distribution of neobatrachians in Gondwana landmasses by the Late Cretaceous. The discovery of the first putative Calyptocephalella-like form from a northern region in South America sheds light on the proposed biogeographic provincialism of frog faunas in South America by the Late Cretaceous.
南美洲是世界上现存青蛙种类最多的地区之一，但我们对中生代这一群体的了解仍然有限。在巴西中南部地区的上白垩纪Bauru群，已经产生了各种各样的脊椎动物群。青蛙的记录是罕见的，仅限于一些保存完好的骨架和碎片材料。尽管如此，它们还是为青蛙的早期多样化和分布提供了重要的线索，尤其是在新蛙科的物种分支中。在这里，我们报告了来自Adamantina和Serra da Galga地层的青蛙的新记录。所描述的标本扩大了bauuru组青蛙的地理范围，并证实了晚白垩纪在冈瓦纳大陆广泛分布的新蛙类的假设。在南美洲北部地区发现的第一个推测的类萼头蛙形式，为提出的白垩纪晚期南美洲青蛙动物群的生物地理地方性提供了线索。
{"title":"New records of frogs (Anura, Lissamphibia) from the Late Cretaceous Bauru Group of Brazil and its paleobiogeographic implications","authors":"Fellipe Muniz , Ariovaldo Giaretta , Thiago S. Fachini , Thiago da Silva Marinho , Pedro Buck , Sabrina Rodrigues , Agustín G. Martinelli","doi":"10.1016/j.cretres.2025.106150","DOIUrl":"10.1016/j.cretres.2025.106150","url":null,"abstract":"<div><div>South America hosts one of the largest diversities of living frogs in the world, but our knowledge of the group during the Mesozoic Era is still limited. The Upper Cretaceous Bauru Group, in the south-central region of Brazil, has yielded a variety of vertebrate groups. Frog records are rare and restricted to a few well-preserved skeletons and fragmentary material. Nevertheless, they have offered important clues about the early diversification and distribution of frogs, especially among the speciose clade Neobatrachia. Here, we report new records of frogs from the Adamantina and Serra da Galga formations. The described specimens expand the geographical range of frogs in the Bauru Group and corroborate the hypothesis of a widespread distribution of neobatrachians in Gondwana landmasses by the Late Cretaceous. The discovery of the first putative <em>Calyptocephalella</em>-like form from a northern region in South America sheds light on the proposed biogeographic provincialism of frog faunas in South America by the Late Cretaceous.</div></div>","PeriodicalId":55207,"journal":{"name":"Cretaceous Research","volume":"175 ","pages":"Article 106150"},"PeriodicalIF":1.9,"publicationDate":"2025-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143923838","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}
Pub Date : 2025-11-01Epub Date: 2025-05-10DOI: 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
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.
{"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":"2025-11-01","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}
Pub Date : 2025-11-01Epub Date: 2025-05-21DOI: 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.
{"title":"The palynoflora from the Lower Cretaceous of Jiuquan Basin, Gansu Province, NW China, and its paleoclimate implication","authors":"Yuan-zheng Lu , Sheng-hui Deng","doi":"10.1016/j.cretres.2025.106166","DOIUrl":"10.1016/j.cretres.2025.106166","url":null,"abstract":"<div><div>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 <em>Classopollis</em> (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 <em>Classopollis</em> 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.</div></div>","PeriodicalId":55207,"journal":{"name":"Cretaceous Research","volume":"175 ","pages":"Article 106166"},"PeriodicalIF":1.9,"publicationDate":"2025-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144195894","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}
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