Pub Date : 2024-10-16DOI: 10.1016/j.cretres.2024.106026
Carlos Iván Medina-Castañeda , Kleyton Magno Cantalice , Carlos Castañeda-Posadas
We describe a new species, †Buapichthys gracilis gen. et sp. nov., based on two specimens from the Turonian deposits of the San José de Gracia quarry, Molcaxac, Puebla, central Mexico. Osteological features show this new species belongs to the order †Crossognathiformes, nesting within the suborder †Pachyrhizodontoidae. The combination of features, such as a slender body, the head with cephalic spines, three hypertrophied postcleithra, the pelvic fin posterior to the dorsal fin, the first and last dorsal pterygiophores modified into scutes, and the dorsal fin bony projections shows that †Buapichthys gracilis gen. et sp. nov. is different from other crossognathiform. This new taxon represents an increase in the group's diversity, constituting the seventh species of the order †Crossognathiformes reported in Mexico. Evaluating the crossognathiform biodiversity over time indicates that the great crossognathiform diversification occurred during the Albian until the Turonian. The Mexican fossil record significantly contributes to this diversity, with about 18 % of the species recognized for this period.
{"title":"A new crossognathiform fish (Teleostei: †Crossognathiformes) from San José de Gracia quarry reveals a great diversity in the Cretaceous outcrops of Mexico","authors":"Carlos Iván Medina-Castañeda , Kleyton Magno Cantalice , Carlos Castañeda-Posadas","doi":"10.1016/j.cretres.2024.106026","DOIUrl":"10.1016/j.cretres.2024.106026","url":null,"abstract":"<div><div>We describe a new species, †<em>Buapichthys gracilis</em> gen. et sp. nov., based on two specimens from the Turonian deposits of the San José de Gracia quarry, Molcaxac, Puebla, central Mexico. Osteological features show this new species belongs to the order †Crossognathiformes, nesting within the suborder †Pachyrhizodontoidae. The combination of features, such as a slender body, the head with cephalic spines, three hypertrophied postcleithra, the pelvic fin posterior to the dorsal fin, the first and last dorsal pterygiophores modified into scutes, and the dorsal fin bony projections shows that †<em>Buapichthys gracilis</em> gen. et sp. nov. is different from other crossognathiform. This new taxon represents an increase in the group's diversity, constituting the seventh species of the order †Crossognathiformes reported in Mexico. Evaluating the crossognathiform biodiversity over time indicates that the great crossognathiform diversification occurred during the Albian until the Turonian. The Mexican fossil record significantly contributes to this diversity, with about 18 % of the species recognized for this period.</div></div>","PeriodicalId":55207,"journal":{"name":"Cretaceous Research","volume":"166 ","pages":"Article 106026"},"PeriodicalIF":1.9,"publicationDate":"2024-10-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142531014","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 : 2024-10-12DOI: 10.1016/j.cretres.2024.106021
Hossein Gholamalian , Mohamad Kazem Kamali , David A. Wood
Fossil echinoids have rarely been described from Iran. This study focuses on the echinoid fauna found in the Cretaceous strata (Kazhdumi Formation) of the Geno and Gerash sections in the Bandar Abbas and Fars areas of the Zagros Mountains, southern Iran. The age of the Kazhdumi Formation in both sections is determined to be Albian-Cenomanian based on the associated ammonites and microfauna, its stratigraphic position, and previous studies on this formation. Twenty-one echinoid species (twelve regular and nine irregular) belonging to seventeen genera were described in this study. Fourteen of these species are reported for the first time from Iran. In addition, a new diadematoid echinoid species, Arabicodidema jafariani sp. nov. is introduced. New age ranges are proposed for Pliotoxaster comanchei and Lambertiaster douvillei. The paleogeographic position of the Zagros Basin in the Tethyan realm is confirmed based on the distribution of the index species.
伊朗很少有关于回声类化石的描述。本研究的重点是在伊朗南部扎格罗斯山脉 Bandar Abbas 和 Fars 地区 Geno 和 Gerash 地段的白垩纪地层（Kazhdumi 地层）中发现的回声虫动物群。根据相关的棘皮动物和微型动物、其地层位置以及以前对该地层的研究，这两个地段的卡兹杜米地层被确定为阿尔卑斯-仙人掌纪。本研究描述了属于 17 个属的 21 个回声虫物种（12 个规则物种和 9 个不规则物种）。其中 14 个物种是首次在伊朗发现。此外，还介绍了一个新的双齿类回声虫物种--Arabicodidema jafariani sp.nov.。此外，还为 Pliotoxaster comanchei 和 Lambertiaster douvillei 提出了新的年代范围。根据索引物种的分布情况，确认了扎格罗斯盆地在泰提安地区的古地理位置。
{"title":"Albian–Cenomanian echinoids from areas north of Bandar Abbas and south of Fars in the Zagros Mountains, Iran","authors":"Hossein Gholamalian , Mohamad Kazem Kamali , David A. Wood","doi":"10.1016/j.cretres.2024.106021","DOIUrl":"10.1016/j.cretres.2024.106021","url":null,"abstract":"<div><div>Fossil echinoids have rarely been described from Iran. This study focuses on the echinoid fauna found in the Cretaceous strata (Kazhdumi Formation) of the Geno and Gerash sections in the Bandar Abbas and Fars areas of the Zagros Mountains, southern Iran. The age of the Kazhdumi Formation in both sections is determined to be Albian-Cenomanian based on the associated ammonites and microfauna, its stratigraphic position, and previous studies on this formation. Twenty-one echinoid species (twelve regular and nine irregular) belonging to seventeen genera were described in this study. Fourteen of these species are reported for the first time from Iran. In addition, a new diadematoid echinoid species, <em>Arabicodidema jafariani</em> sp. nov. is introduced. New age ranges are proposed for <em>Pliotoxaster comanchei</em> and <em>Lambertiaster douvillei</em>. The paleogeographic position of the Zagros Basin in the Tethyan realm is confirmed based on the distribution of the index species.</div></div>","PeriodicalId":55207,"journal":{"name":"Cretaceous Research","volume":"166 ","pages":"Article 106021"},"PeriodicalIF":1.9,"publicationDate":"2024-10-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142554277","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 : 2024-10-09DOI: 10.1016/j.cretres.2024.106020
Paul Penkalski
Ankylosaurids but not nodosaurids possess a suite of neomorphic elements fused to the posterior border of the skull roof. Previous authors have offered conflicting descriptions of these elements, leading to ongoing confusion over their morphology, developmental origin, and homologies. They have been described both as secondary dermal additions and as outgrowths of known skull elements. However, they are demonstrably neomorphic and were incorporated into the skull early in ankylosaurid evolution. The six elements—three per side—are herein termed the supranuchal, postsquamosal, and postquadratojugal and form the posterior margin of the skull on each side (in some taxa, the parietal also reaches the posterior border). They do not overlie the squamosal or quadratojugal but rather articulate with them. Other neomorphic elements including the supraorbitals and supranarial ossifications have been described previously. The squamosal proper is a small element in the skull roof with a well-defined cotylus ventrally for articulation with the quadrate. The three neomorphs likely originated as a cervical half-ring or simply as a series of six cervical osteoderms situated just posterior to the skull in ancestral ankylosaurs.
{"title":"The ankylosaurid neomorphic skull elements","authors":"Paul Penkalski","doi":"10.1016/j.cretres.2024.106020","DOIUrl":"10.1016/j.cretres.2024.106020","url":null,"abstract":"<div><div>Ankylosaurids but not nodosaurids possess a suite of neomorphic elements fused to the posterior border of the skull roof. Previous authors have offered conflicting descriptions of these elements, leading to ongoing confusion over their morphology, developmental origin, and homologies. They have been described both as secondary dermal additions and as outgrowths of known skull elements. However, they are demonstrably neomorphic and were incorporated into the skull early in ankylosaurid evolution. The six elements—three per side—are herein termed the supranuchal, postsquamosal, and postquadratojugal and form the posterior margin of the skull on each side (in some taxa, the parietal also reaches the posterior border). They do not overlie the squamosal or quadratojugal but rather articulate with them. Other neomorphic elements including the supraorbitals and supranarial ossifications have been described previously. The squamosal proper is a small element in the skull roof with a well-defined cotylus ventrally for articulation with the quadrate. The three neomorphs likely originated as a cervical half-ring or simply as a series of six cervical osteoderms situated just posterior to the skull in ancestral ankylosaurs.</div></div>","PeriodicalId":55207,"journal":{"name":"Cretaceous Research","volume":"166 ","pages":"Article 106020"},"PeriodicalIF":1.9,"publicationDate":"2024-10-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142531012","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 : 2024-10-09DOI: 10.1016/j.cretres.2024.106017
Emerson Ferreira de Oliveira , Silvina de Valais , Alessandro Batezelli , Carlos Roberto Candeiro
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.
在国际文献中，上白垩纪以其丰富多样的陆地生物而闻名。有关沉积物及其中保存的脊椎动物和无脊椎动物化石的研究很多。对科学研究做出贡献的另一个重要数据是古沉积剖面的诊断特征，如地层、结构和根迹。这项研究在一个露头中发现了古溶胶、沉积物和恐龙足迹的记录。根据宏观和微观形态数据对古溶胶进行了分析。这些古溶胶具有 Bt 和 C 层，可以重建复合古溶胶的沉积发展过程。为了识别和解释沉积物，对沉积环境进行了剖面分析和解释。这些沉积物是细砂和粘土交替的平行层理沉积结构。含足迹层为表格状平行层理沉积结构，细砂和粘土交替分布。根据宽度、深度、形态和尺寸对现场的足迹进行了鉴定，因此可以确定模子和铸模。四个不同地层中至少有 19 个凹形结构被解释为恐龙足迹的横截面，其中一些保留在分析露头的顶部。恐龙足迹在地质记录中的保存取决于特定条件，如沉积物的可塑性和一致性以及沉积环境。此外，还必须考虑其他一系列因素，例如这些动物是如何以及为什么来到这个地方。古沉积物表明地形稳定，有足够的时间进行成土过程，而保存在剖面顶部的平行层理表明地形不稳定，没有足够的时间进行土壤发育。因此，沉积物的可塑性使得记录足迹成为可能。这项研究通过利用古溶胶、沉积物和恐龙足迹记录，为重建地貌的古生态和环境做出了贡献。
{"title":"Upper Cretaceous sauropod dinosaur tracks, palaeosols, and sedimentary deposits - Bauru Group, southeastern Brazil","authors":"Emerson Ferreira de Oliveira , Silvina de Valais , Alessandro Batezelli , 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}
Pub Date : 2024-10-09DOI: 10.1016/j.cretres.2024.106019
Alina Kanarkina , Nikolay Zverkov , Irina Polyakova
Protosphyraena 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 Protosphyraena 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 Protosphyraena. The type species, P. ferox, is unambiguously known from teeth, cranial fragments and mandibles. The posteriorly directed rostral teeth of the type species cast doubt on the validity of Australopachycormus originally erected based on this feature. Our observations support the assignments of the historical Russian Cenomanian specimens to P. ferox and P. tenuirostris. We do not find sufficient cause to refer all isolated fins from Europe to P. ferox, 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 Protosphyraena from the Caucasus are consistent with one of these species, Protosphyraena gibberula comb. nov. Our findings indicate that Protosphyraena was widespread already in the late Early Cretaceous. Moreover, the youngest occurrence of Protosphyraena in Europe, a pectoral fin from the Maastrichtian of Belgium, demonstrates unique features and is thus referred to a new species, Protosphyraena terminata sp. nov.
Protosphyraena是白垩纪分布最广的腕足动物属之一，主要在北美和西欧的上白垩世描述了许多物种。然而，大多数物种都是从零散的、解剖结构不重叠的材料中得知的，这使得该属的阿尔法分类极为困难。在这里，我们描述了在高加索阿尔卑斯山首次发现的原角龙，并重新评估了俄罗斯库尔斯克地区仙人掌纪的历史标本。为了将俄罗斯的标本归入一个特定的物种，我们回顾了全球记录和纠缠不清的原尾柱虫分类法。从牙齿、头盖骨碎片和下颌骨中可以明确地了解到模式种--铁狐（P. ferox）。该模式种的喙齿向后，这使人们对最初根据这一特征建立的 Australopachycormus 的有效性产生了怀疑。我们的观察结果支持将历史上的俄罗斯塞诺曼时期标本归属于 P. ferox 和 P. tenuirostris。我们认为没有足够的理由将欧洲所有孤立的鳍鱼都归入P.相反，阿加西（Agassiz）最初为英国白垩纪的分离鳍提出的物种是可用的，而高加索地区的Protosphyraena鳍与其中的一个物种--Protosphyraena gibberula comb.nov.是一致的。我们的研究结果表明，早白垩世晚期，Protosphyraena已经广泛分布。此外，欧洲出现的最年轻的Protosphyraena--来自比利时马斯特里赫特期的胸鳍--显示出独特的特征，因此被称为一个新物种--Protosphyraena terminata sp.
{"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 , Nikolay Zverkov , 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}
Pub Date : 2024-10-05DOI: 10.1016/j.cretres.2024.106018
Luis M. Sender , Uxue Villanueva-Amadoz , Torsten Wappler , José B. Diez , Alberto Cobos
Exquisitely well-preserved records of a nearly monospecific assemblage of in situ specimens in growth position of the fern Ruffordia goeppertii 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 Ruffordia 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.
{"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 , Uxue Villanueva-Amadoz , Torsten Wappler , José B. Diez , 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}
Pub Date : 2024-10-02DOI: 10.1016/j.cretres.2024.106016
Juan David Vallejo , Regina Buarque de Gusmão , Marcelo de Araujo Carvalho , Claus Fallgatter , Enelise Katia Piovesan
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 Sergipea variverrucata biozone (P-270), as well as the occurrence of Complicatisaccus cearensis and Equisetosporites maculosus. The identification of marine palynomorphs (dinoflagellate cysts Subtilisphaera and foraminiferal test linings) are indicative of several, local marine incursions.
{"title":"Sedimentary organic matter and paleoenvironmental reconstruction of the Santana Group (Lower Cretaceous), Araripe Basin, Northeast Brazil","authors":"Juan David Vallejo , Regina Buarque de Gusmão , Marcelo de Araujo Carvalho , Claus Fallgatter , 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}
Pub Date : 2024-10-01DOI: 10.1016/j.cretres.2024.106015
Megan L. Jacobs , Roy E. Smith , Samir Zouhri
A new ornithocheirid pterosaur, Akharhynchus martilli 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 Akharhynchus has affinities with Tropeognathus within Tropeognathinae.
{"title":"A new ornithocheirid pterosaur (Pterosauria: Ornithocheiridae) from the mid-Cretaceous Ifezouane Formation, Kem Kem Group of Morocco","authors":"Megan L. Jacobs , Roy E. Smith , 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}
Pub Date : 2024-09-24DOI: 10.1016/j.cretres.2024.106014
Xuri Wang , Andrea Cau , Yinuo Wang , Martin Kundrát , Guili Zhang , Yichuan Liu , Luis M. Chiappe
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, Shuilingornis angelai 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 Shuilingornis gen. nov. represents an early adult stage at the time of death. The phylogenetic analysis robustly supports the referral of Shuilingornis gen. nov. to Gansuidae. Except for the controversial Hollanda, 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.
{"title":"A new gansuid bird (Avialae, Euornithes) from the Lower Cretaceous (Aptian) Jiufotang Formation of Jianchang, western Liaoning, China","authors":"Xuri Wang , Andrea Cau , Yinuo Wang , Martin Kundrát , Guili Zhang , Yichuan Liu , 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}
Pub Date : 2024-09-21DOI: 10.1016/j.cretres.2024.106013
Soo Bin Lee , Gi Soo Nam , André Nel , Jong Kyun Park
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: Umenocoleus minimus sp. nov., Pseudoblattapterix weoni gen. et sp. nov., and Petropterix koreaensis 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 Vitisma and Permoponopterix from the Umenocoleidae family and propose to transfer the genus Permoponopterix into the Protelytroptera.
{"title":"A new Albian genus and species and two other new species of Umenocoleidae (Dictyoptera) from South Korea","authors":"Soo Bin Lee , Gi Soo Nam , André Nel , 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}
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