Pub Date : 2024-12-26DOI: 10.1016/j.cretres.2024.106076
Jiří Kolibáč , Evgeny E. Perkovsky
Cleroid beetle Aiytillus agapensis gen. et sp. nov. is described from upper Cenomanian Taimyr amber. This is the first finding of a predatory checkered beetle (Cleridae) in the Cretaceous. Based on the tarsi with equally large tarsomeres 1–4, the fossil is unambiguously assigned to the basal clerid subfamily Tillinae. The fossil was found near the Nizhnyaya Agapa River in the upper horizon of the Dolgan Formation during an expedition in 1973. Although damaged by improper preservation, the fossil exhibits a number of interesting morphological details including extremely small body (less than 3 mm), long serrated antenna, pretarsal claw with denticle, and comb-like protibial structures. The unusually long antenna together with the aforementioned morphological characters resembles another small tilline fossil Bilbotillus glum Kolibáč from Baltic Amber, although the latter is about 60 My younger. The presence of modern looking clerids in the Middle Jurassic of NE China as well as in Taimyr and Baltic ambers, and conversely their absence in burmite, may indicate the origin of the family in temperate rather than tropical conditions.
{"title":"The first record of a predaceous clerid beetle (Coleoptera: Cleridae) from the Cretaceous Taimyr amber","authors":"Jiří Kolibáč , Evgeny E. Perkovsky","doi":"10.1016/j.cretres.2024.106076","DOIUrl":"10.1016/j.cretres.2024.106076","url":null,"abstract":"<div><div>Cleroid beetle <em>A</em><em>iy</em><em>tillus agapensis</em> gen. et sp. nov. is described from upper Cenomanian Taimyr amber. This is the first finding of a predatory checkered beetle (Cleridae) in the Cretaceous. Based on the tarsi with equally large tarsomeres 1–4, the fossil is unambiguously assigned to the basal clerid subfamily Tillinae. The fossil was found near the Nizhnyaya Agapa River in the upper horizon of the Dolgan Formation during an expedition in 1973. Although damaged by improper preservation, the fossil exhibits a number of interesting morphological details including extremely small body (less than 3 mm), long serrated antenna, pretarsal claw with denticle, and comb-like protibial structures. The unusually long antenna together with the aforementioned morphological characters resembles another small tilline fossil <em>Bilbotillus glum</em> Kolibáč from Baltic Amber, although the latter is about 60 My younger. The presence of modern looking clerids in the Middle Jurassic of NE China as well as in Taimyr and Baltic ambers, and conversely their absence in burmite, may indicate the origin of the family in temperate rather than tropical conditions.</div></div>","PeriodicalId":55207,"journal":{"name":"Cretaceous Research","volume":"168 ","pages":"Article 106076"},"PeriodicalIF":1.9,"publicationDate":"2024-12-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143181847","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 : 2024-12-20DOI: 10.1016/j.cretres.2024.106072
Elisabete Malafaia , Fernando Escaso , Rodolfo A. Coria , Adán Pérez-García , Francisco Ortega
The upper Campanian–lower Maastrichtian site of Poyos (Guadalajara, Spain) has yielded an abundant fossil record of reptiles, including several cranial and postcranial elements of theropod dinosaurs. Here we present a study, based on statistical and cladistic analyses as well as on detailed description, of a sample of isolated theropod teeth collected from this site. The sample comprises twenty relatively complete and well-preserved tooth crowns, belonging to mesial and lateral teeth. The combination of morphological and morphometric features is consistent with the identification of these specimens as belonging to a medium-sized abelisaurid theropod. These specimens resemble the teeth associated with the holotype of Arcovenator escotae (upper Campanian of France) and some isolated teeth assigned to Arcovenator sp. from different temporal correlative localities of Spain. These similarities suggest the presence of an abelisaurid closely related to Arcovenator in Poyos, expanding the fossil record of this lineage of abelisaurids to the upper Campanian-lower Maastrichtian in the Iberian Peninsula. The currently known fossil record shows that abelisaurids were one of the most abundant groups of non-coelurosaurian theropods in the Upper Cretaceous of Europe and possibly the only medium-to large-size carnivorous dinosaurs in the Ibero-Armorican realm from the upper Cenomanian to the upper Maastrichtian. The increasing abundance of abelisaurids during the Late Cretaceous and the vanishing of other large theropods that dominated the Early Cretaceous faunas of Ibero-Armorica seem to be part of a faunistic turnover that can be related to a climate change to semi-arid conditions.
{"title":"Theropod teeth from the Upper Cretaceous of central Spain: Assessing the paleobiogeographic history of European abelisaurids","authors":"Elisabete Malafaia , Fernando Escaso , Rodolfo A. Coria , Adán Pérez-García , Francisco Ortega","doi":"10.1016/j.cretres.2024.106072","DOIUrl":"10.1016/j.cretres.2024.106072","url":null,"abstract":"<div><div>The upper Campanian–lower Maastrichtian site of Poyos (Guadalajara, Spain) has yielded an abundant fossil record of reptiles, including several cranial and postcranial elements of theropod dinosaurs. Here we present a study, based on statistical and cladistic analyses as well as on detailed description, of a sample of isolated theropod teeth collected from this site. The sample comprises twenty relatively complete and well-preserved tooth crowns, belonging to mesial and lateral teeth. The combination of morphological and morphometric features is consistent with the identification of these specimens as belonging to a medium-sized abelisaurid theropod. These specimens resemble the teeth associated with the holotype of <em>Arcovenator escotae</em> (upper Campanian of France) and some isolated teeth assigned to <em>Arcovenator</em> sp. from different temporal correlative localities of Spain. These similarities suggest the presence of an abelisaurid closely related to <em>Arcovenator</em> in Poyos, expanding the fossil record of this lineage of abelisaurids to the upper Campanian-lower Maastrichtian in the Iberian Peninsula. The currently known fossil record shows that abelisaurids were one of the most abundant groups of non-coelurosaurian theropods in the Upper Cretaceous of Europe and possibly the only medium-to large-size carnivorous dinosaurs in the Ibero-Armorican realm from the upper Cenomanian to the upper Maastrichtian. The increasing abundance of abelisaurids during the Late Cretaceous and the vanishing of other large theropods that dominated the Early Cretaceous faunas of Ibero-Armorica seem to be part of a faunistic turnover that can be related to a climate change to semi-arid conditions.</div></div>","PeriodicalId":55207,"journal":{"name":"Cretaceous Research","volume":"168 ","pages":"Article 106072"},"PeriodicalIF":1.9,"publicationDate":"2024-12-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143181581","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 : 2024-12-18DOI: 10.1016/j.cretres.2024.106071
Rhys D. Meyerkort , Benjamin P. Kear , Michael J. Everhart , Mikael Siversson
Ichthyosaurs maintained substantial species diversity throughout the Early Cretaceous, yet experienced a dramatic decline at the beginning of the Cenomanian. Reliable records of ichthyosaurs in the middle and upper Cenomanian are extremely scarce, with only one previous unequivocal record from the upper Cenomanian of Germany. Here, we describe an isolated ichthyosaur phalanx recovered from the ‘upper’ Gearle Siltstone in the lower Murchison River area of Western Australia. This fossil can be assigned to the terminal ichthyosaur clade Brachypterygiidae based on its distinctly rectangular shape. Stratigraphical bracketing using calcareous nannofossils delimits a Cenomanian age, which we further constrain as middle–late Cenomanian using elasmobranch teeth extracted from the same depositional horizon as the phalanx. The ‘upper’ Gearle Siltstone ichthyosaur occurrence thus represents the geologically youngest example of the group documented from the Southern Hemisphere, and implies a widespread distribution prior to their final extinction in the late Cenomanian.
{"title":"Youngest fossil occurrence of ichthyosaurs from the Southern Hemisphere","authors":"Rhys D. Meyerkort , Benjamin P. Kear , Michael J. Everhart , Mikael Siversson","doi":"10.1016/j.cretres.2024.106071","DOIUrl":"10.1016/j.cretres.2024.106071","url":null,"abstract":"<div><div>Ichthyosaurs maintained substantial species diversity throughout the Early Cretaceous, yet experienced a dramatic decline at the beginning of the Cenomanian. Reliable records of ichthyosaurs in the middle and upper Cenomanian are extremely scarce, with only one previous unequivocal record from the upper Cenomanian of Germany. Here, we describe an isolated ichthyosaur phalanx recovered from the ‘upper’ Gearle Siltstone in the lower Murchison River area of Western Australia. This fossil can be assigned to the terminal ichthyosaur clade Brachypterygiidae based on its distinctly rectangular shape. Stratigraphical bracketing using calcareous nannofossils delimits a Cenomanian age, which we further constrain as middle–late Cenomanian using elasmobranch teeth extracted from the same depositional horizon as the phalanx. The ‘upper’ Gearle Siltstone ichthyosaur occurrence thus represents the geologically youngest example of the group documented from the Southern Hemisphere, and implies a widespread distribution prior to their final extinction in the late Cenomanian.</div></div>","PeriodicalId":55207,"journal":{"name":"Cretaceous Research","volume":"168 ","pages":"Article 106071"},"PeriodicalIF":1.9,"publicationDate":"2024-12-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143180241","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 : 2024-12-16DOI: 10.1016/j.cretres.2024.106069
Grigory A. Ivanov , Dmitry D. Vorontsov , Dmitry E. Shcherbakov
Cretaceous resins have preserved a remarkable diversity of sternorrhynchans. Burmese amber, formed in the mid-Cretaceous tropics, contains more numerous and diverse Psyllomorpha than all other fossil localities of the period together. The genus Dingla Szwedo et Drohojowska, 2020, previously placed into a separate family and infraorder, turned out to be similar in all essential characters to Mirala Burckhardt et Poinar, 2019 and Burmala Liu et al., 2021; therefore we synonymize Dinglidae Szwedo et Drohojowska, 2020 with Miralinae Shcherbakov, 2020 and raise the last subfamily to the full family status based on several unique apomorphies. A sister-group relationship between Dinglomorpha and Aleyrodomorpha was based on incorrect interpretation of characters. Pictala scorpioides gen. et sp. nov. from Burmese amber differs from other miralid genera by spotted forewings without pterostigma and the structure of terminalia in both sexes. In Miralidae, we discovered a long annulated labium and compound wax pores on the ventral side of the abdomen—for the first time among Hemiptera. The compound wax pores may have helped prevent miralids from sticking to the honeydew excreted. The long, flexible second labial segment, reinforced by sclerotized rings, probably allowed the protrusible length of the stylet bundle to be increased by arching the labium, as in mosquitoes.
{"title":"A remarkable psyllomorph family from Cretaceous Burmese amber, Miralidae stat. nov. (= Dinglidae syn. nov.; Hemiptera: Sternorrhyncha)","authors":"Grigory A. Ivanov , Dmitry D. Vorontsov , Dmitry E. Shcherbakov","doi":"10.1016/j.cretres.2024.106069","DOIUrl":"10.1016/j.cretres.2024.106069","url":null,"abstract":"<div><div>Cretaceous resins have preserved a remarkable diversity of sternorrhynchans. Burmese amber, formed in the mid-Cretaceous tropics, contains more numerous and diverse Psyllomorpha than all other fossil localities of the period together. The genus <em>Dingla</em> Szwedo et Drohojowska, 2020, previously placed into a separate family and infraorder, turned out to be similar in all essential characters to <em>Mirala</em> Burckhardt et Poinar, 2019 and <em>Burmala</em> Liu et al., 2021; therefore we synonymize Dinglidae Szwedo et Drohojowska, 2020 with Miralinae Shcherbakov, 2020 and raise the last subfamily to the full family status based on several unique apomorphies. A sister-group relationship between Dinglomorpha and Aleyrodomorpha was based on incorrect interpretation of characters. <em>Pictala scorpioides</em> gen. et sp. nov. from Burmese amber differs from other miralid genera by spotted forewings without pterostigma and the structure of terminalia in both sexes. In Miralidae, we discovered a long annulated labium and compound wax pores on the ventral side of the abdomen—for the first time among Hemiptera. The compound wax pores may have helped prevent miralids from sticking to the honeydew excreted. The long, flexible second labial segment, reinforced by sclerotized rings, probably allowed the protrusible length of the stylet bundle to be increased by arching the labium, as in mosquitoes.</div></div>","PeriodicalId":55207,"journal":{"name":"Cretaceous Research","volume":"168 ","pages":"Article 106069"},"PeriodicalIF":1.9,"publicationDate":"2024-12-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143181582","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 : 2024-12-13DOI: 10.1016/j.cretres.2024.106070
Byung-Do Choi , Yaqiong Wang
This work presents the first review and comprehensive insights into ostracod faunas of the Cretaceous basins of South Korea. Based on previous literature and new data, a total of 57 species belonging to 13 genera, and nine ostracod assemblages are classified from 15 formations of six basins (Gyeongsang, Yeongdong, Hampyeong, Mokpo Volcanics, Haenam, and Sunchang basins). The ostracods of the Gyeongsang Basin can be divided into four assemblages in ascending order: Cyprideidae (Barremian–early Albian; Sindong Group), Cypridea–Ziziphocypris–Lycopterocypris (late Albian–Cenomanian; lower Hayang Group), Lycopterocypris–Cypria (Turonian–?Campanian; upper Hayang Group), and Mongolocypris (Campanian; Anpo Tuff). And, the ostracods from small basins are divided into five assemblages: Candona (Barremian–Aptian; lower strata of the Yeongdong Basin), Lycopterocypris (Aptian–Albian; Seonyudong Formation of the Yeongdong Basin), Mongolocypris–Cypridea–Candona (Aptian–?Cenomanian; Hampyeong Basin and Mokpo Volcanics), Cypridea–Candona (Campanian; Haenam Basin), and Mongolocypris–Cypridea (Campanian; Sunchang Basin). Most diverse taxa of the basins are the representatives of the superfamily Cypridoidea, especially the species of the genus Cypridea. These occurrences indicate the existence of numerous unstable lakes and temporary waterbodies. The pre-Aptian ostracod diversity is very low but peaked during the early Albian–Cenomanian. The species from the upper Albian-Campanian strata of the Gyeongsang Basin (especially Ziziphocypris and Lycopterocypris species) and the Aptian–?Cenomanian Hampyeong Basin exhibit significant similarities with ostracods from China and Mongolia, indicating active faunal exchanges and migration. The Cenomanian ostracods may represent a transitional fauna during the faunal turnover in East Asia, whereas ostracod diversity in the basins tends to decrease again during the Turonian–Campanian.
{"title":"Cretaceous non-marine ostracod faunas of South Korea: Synthesis of taxonomy, biostratigraphy and paleoecology","authors":"Byung-Do Choi , Yaqiong Wang","doi":"10.1016/j.cretres.2024.106070","DOIUrl":"10.1016/j.cretres.2024.106070","url":null,"abstract":"<div><div>This work presents the first review and comprehensive insights into ostracod faunas of the Cretaceous basins of South Korea. Based on previous literature and new data, a total of 57 species belonging to 13 genera, and nine ostracod assemblages are classified from 15 formations of six basins (Gyeongsang, Yeongdong, Hampyeong, Mokpo Volcanics, Haenam, and Sunchang basins). The ostracods of the Gyeongsang Basin can be divided into four assemblages in ascending order: Cyprideidae (Barremian–early Albian; Sindong Group), <em>Cypridea</em>–<em>Ziziphocypris</em>–<em>Lycopterocypris</em> (late Albian–Cenomanian; lower Hayang Group), <em>Lycopterocypris</em>–<em>Cypria</em> (Turonian–?Campanian; upper Hayang Group), and <em>Mongolocypris</em> (Campanian; Anpo Tuff). And, the ostracods from small basins are divided into five assemblages: <em>Candona</em> (Barremian–Aptian; lower strata of the Yeongdong Basin), <em>Lycopterocypris</em> (Aptian–Albian; Seonyudong Formation of the Yeongdong Basin), <em>Mongolocypris</em>–<em>Cypridea</em>–<em>Candona</em> (Aptian–?Cenomanian; Hampyeong Basin and Mokpo Volcanics), <em>Cypridea</em>–<em>Candona</em> (Campanian; Haenam Basin), and <em>Mongolocypris</em>–<em>Cypridea</em> (Campanian; Sunchang Basin). Most diverse taxa of the basins are the representatives of the superfamily Cypridoidea, especially the species of the genus <em>Cypridea</em>. These occurrences indicate the existence of numerous unstable lakes and temporary waterbodies. The pre-Aptian ostracod diversity is very low but peaked during the early Albian–Cenomanian. The species from the upper Albian-Campanian strata of the Gyeongsang Basin (especially <em>Ziziphocypris</em> and <em>Lycopterocypris</em> species) and the Aptian–?Cenomanian Hampyeong Basin exhibit significant similarities with ostracods from China and Mongolia, indicating active faunal exchanges and migration. The Cenomanian ostracods may represent a transitional fauna during the faunal turnover in East Asia, whereas ostracod diversity in the basins tends to decrease again during the Turonian–Campanian.</div></div>","PeriodicalId":55207,"journal":{"name":"Cretaceous Research","volume":"168 ","pages":"Article 106070"},"PeriodicalIF":1.9,"publicationDate":"2024-12-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143180239","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 : 2024-12-09DOI: 10.1016/j.cretres.2024.106068
Huazheng Zhu , Yaqiong Wang , Byung-Do Choi , Yanhong Pan
This study provides a comprehensive taxonomic analysis of ostracod species from the Jingchuan Formation in the Ordos Basin. We identified six species from four genera: Cypridea koskulensis, Mongolocypris sp., Lycopterocypris debilis, Djungarica aff. saidovi, and Alicenula spp. Our newly ostracod biostratigraphic data suggests that the Jingchuan Formation is dated to the Aptian. Moreover, our findings corroborate the hypothesis of non-marine ostracod faunal exchange in East Asia during the Early Cretaceous. This new temporal constraint also enhances our understanding of the age of Cretaceous aeolian desert sediments and red beds within the Ordos Basin.
{"title":"Ostracod fauna from the Lower Cretaceous Jingchuan Formation of Ordos Basin in China and its biostratigraphic significance","authors":"Huazheng Zhu , Yaqiong Wang , Byung-Do Choi , Yanhong Pan","doi":"10.1016/j.cretres.2024.106068","DOIUrl":"10.1016/j.cretres.2024.106068","url":null,"abstract":"<div><div>This study provides a comprehensive taxonomic analysis of ostracod species from the Jingchuan Formation in the Ordos Basin. We identified six species from four genera: <em>Cypridea koskulensis</em>, <em>Mongolocypris</em> sp., <em>Lycopterocypris debilis</em>, <em>Djungarica</em> aff. <em>saidovi</em>, and <em>Alicenula</em> spp. Our newly ostracod biostratigraphic data suggests that the Jingchuan Formation is dated to the Aptian. Moreover, our findings corroborate the hypothesis of non-marine ostracod faunal exchange in East Asia during the Early Cretaceous. This new temporal constraint also enhances our understanding of the age of Cretaceous aeolian desert sediments and red beds within the Ordos Basin.</div></div>","PeriodicalId":55207,"journal":{"name":"Cretaceous Research","volume":"168 ","pages":"Article 106068"},"PeriodicalIF":1.9,"publicationDate":"2024-12-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143181579","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 : 2024-12-09DOI: 10.1016/j.cretres.2024.106059
Mohammed I. Fallatah , Mahmoud Alnazghah , Charles Kerans , Abdulkarim Al-Hussaini
The inception of a foreland basin on the Arabian Plate and its subsidence history during the Late Cretaceous are recorded in its forebulge and backbulge sedimentary succession. Exposures of this succession in central Saudi Arabia were examined through a multi-disciplinary approach involving sedimentology, stratigraphy, biostratigraphy, and geochemistry to document the stratigraphic evolution of the depositional system. The succession is marked at its base by deltaic, estuarine, and open-coast tidal flat siliciclastic deposits of the Majma, Qibah, and Malihah formations. These units transition upward into the Aruma Formation which represents carbonate deposition on a carbonate ramp. A Campanian–Maastrichtian age for the Aruma Formation is consistent with the appearance of a negative carbon isotope excursion marking the Campanian-Maastrichtian Boundary Event. The lithological shift from siliciclastics to shallow-water carbonates marks an overall transgression, over a regional unconformity, which is contrary to the documented long-term eustatic sea-level fall from the Turonian through Maastrichtian. This was driven by progressive increase in flexural subsidence due to ophiolite obduction over the plate's eastern and northeastern margins, forcing the Aruma Formation carbonates to onlap onto the unconformity and backstep over the forebulge of the foreland basin. The maximum flexural subsidence is manifested by the deposition of a phosphoritic condensed section in the earliest Maastrichtian, which also signals to the timing of the farthest advancement of the ophiolites over the plate's margins. This study showcases the capacity of shallow-water carbonate systems as recorders of subsidence history in foreland basins.
{"title":"Geochemistry and regional stratigraphy of the Upper Cretaceous succession of central Saudi Arabia: A record of foreland basin inception on the Arabian Plate","authors":"Mohammed I. Fallatah , Mahmoud Alnazghah , Charles Kerans , Abdulkarim Al-Hussaini","doi":"10.1016/j.cretres.2024.106059","DOIUrl":"10.1016/j.cretres.2024.106059","url":null,"abstract":"<div><div>The inception of a foreland basin on the Arabian Plate and its subsidence history during the Late Cretaceous are recorded in its forebulge and backbulge sedimentary succession. Exposures of this succession in central Saudi Arabia were examined through a multi-disciplinary approach involving sedimentology, stratigraphy, biostratigraphy, and geochemistry to document the stratigraphic evolution of the depositional system. The succession is marked at its base by deltaic, estuarine, and open-coast tidal flat siliciclastic deposits of the Majma, Qibah, and Malihah formations. These units transition upward into the Aruma Formation which represents carbonate deposition on a carbonate ramp. A Campanian–Maastrichtian age for the Aruma Formation is consistent with the appearance of a negative carbon isotope excursion marking the Campanian-Maastrichtian Boundary Event. The lithological shift from siliciclastics to shallow-water carbonates marks an overall transgression, over a regional unconformity, which is contrary to the documented long-term eustatic sea-level fall from the Turonian through Maastrichtian. This was driven by progressive increase in flexural subsidence due to ophiolite obduction over the plate's eastern and northeastern margins, forcing the Aruma Formation carbonates to onlap onto the unconformity and backstep over the forebulge of the foreland basin. The maximum flexural subsidence is manifested by the deposition of a phosphoritic condensed section in the earliest Maastrichtian, which also signals to the timing of the farthest advancement of the ophiolites over the plate's margins. This study showcases the capacity of shallow-water carbonate systems as recorders of subsidence history in foreland basins.</div></div>","PeriodicalId":55207,"journal":{"name":"Cretaceous Research","volume":"168 ","pages":"Article 106059"},"PeriodicalIF":1.9,"publicationDate":"2024-12-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143180240","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}
The successions of the Gurpi Formation and the lower Pabdeh Formation were examined through analyses of lithology, sequence stratigraphy, stable isotope stratigraphy, and ichnofossils in the Jahangir Abad and Abhar sections of the Kabir Kuh anticline within the Lurestan Zone. Stratigraphic correlation with the well-dated Gandab section, located within the same anticline, indicates a late Campanian to early Danian age for these successions. This correlation further confirms the presence of notable carbon isotope excursions associated with the Campanian-Maastrichtian Boundary Event (CMBE) and Mid-Maastrichtian Event (MME). Field observations, along with sedimentological and paleontological analyses, suggest that the Kabir Kuh area was situated within the fore-bulge of the Zagros foreland basin during the Late Cretaceous. Changes in lithology, fossil content, and ichnofacies indicate a significant decrease in water depth at the end of the Campanian and the beginning of the Maastrichtian. This interval contains shallow marine macrofossils, including oysters (mainly Lopha), benthic foraminifers, and fossil debris traces, indicative of a high-energy environment. In contrast, shallow-water facies are not recorded within the middle and late Maastrichtian sequences. These sequences are composed of pelagic mud-dominated facies containing deep-sea ichnofossils, indicating a rapid increase in water-depth during the middle–late Maastrichtian. The observed late Campanian to early Maastrichtian shallowing is associated with the development of the Zagros fore-bulge, while the subsequent deepening and significant sediment deposition during the mid to late Maastrichtian are attributed to the subsidence of the basin. This research re-evaluates and refines the existing sequence stratigraphic and sedimentary models of the Zagros foreland basin, offering new perspectives on its geological evolution.
{"title":"Palaeoenvironmental interpretation and isotope stratigraphy of the Campanian–Danian successions in the Zagros Foreland Basin (Kabir Kuh, Lurestan, Iran)","authors":"Elham Talebi , Hamzeh Mehrabi , Mehdi Daraei , Amin Navidtalab , Aram Bayet-Goll","doi":"10.1016/j.cretres.2024.106058","DOIUrl":"10.1016/j.cretres.2024.106058","url":null,"abstract":"<div><div>The successions of the Gurpi Formation and the lower Pabdeh Formation were examined through analyses of lithology, sequence stratigraphy, stable isotope stratigraphy, and ichnofossils in the Jahangir Abad and Abhar sections of the Kabir Kuh anticline within the Lurestan Zone. Stratigraphic correlation with the well-dated Gandab section, located within the same anticline, indicates a late Campanian to early Danian age for these successions. This correlation further confirms the presence of notable carbon isotope excursions associated with the Campanian-Maastrichtian Boundary Event (CMBE) and Mid-Maastrichtian Event (MME). Field observations, along with sedimentological and paleontological analyses, suggest that the Kabir Kuh area was situated within the fore-bulge of the Zagros foreland basin during the Late Cretaceous. Changes in lithology, fossil content, and ichnofacies indicate a significant decrease in water depth at the end of the Campanian and the beginning of the Maastrichtian. This interval contains shallow marine macrofossils, including oysters (mainly Lopha), benthic foraminifers, and fossil debris traces, indicative of a high-energy environment. In contrast, shallow-water facies are not recorded within the middle and late Maastrichtian sequences. These sequences are composed of pelagic mud-dominated facies containing deep-sea ichnofossils, indicating a rapid increase in water-depth during the middle–late Maastrichtian. The observed late Campanian to early Maastrichtian shallowing is associated with the development of the Zagros fore-bulge, while the subsequent deepening and significant sediment deposition during the mid to late Maastrichtian are attributed to the subsidence of the basin. This research re-evaluates and refines the existing sequence stratigraphic and sedimentary models of the Zagros foreland basin, offering new perspectives on its geological evolution.</div></div>","PeriodicalId":55207,"journal":{"name":"Cretaceous Research","volume":"168 ","pages":"Article 106058"},"PeriodicalIF":1.9,"publicationDate":"2024-11-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143180244","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 : 2024-11-26DOI: 10.1016/j.cretres.2024.106057
Qi Zhang , Ning Jia , Yizheng Li , Jianxun Wang , Alexander P. Rasnitsyn
Falsiformicidae is a poorly known extinct family of aculeate wasps. It is known only as inclusions in various Cretaceous ambers. Brachypterous male Falsiformix pedestris Zhang and Rasnitsyn gen. et sp. nov. is described in the family Falsiformicidae based on a unique fossil from the middle Cretaceous Kachin amber. Occurrence and meaning of the male flightlessness in Hymenoptera is discussed. A combination of the flightless males with flying females occurs when mating takes place shortly after the eclosion, before adults disperse from confined space where they developed. An equally rare even if less exotic strategy with males and females both being flightless depends on the female pedestrian habits rather than on the pre-dispersal mating. Wide spatial (Angara Land, Laurussia Land and Gondwana Land) and narrow temporal distribution (Cenomanian and Turonian ages only) indicate Falsiformicidae as a possibly important stratigraphical indicator.
{"title":"New genus of falsiformicid wasps (Hymenoptera, Vespoidea: Falsiformicidae) with brachypterous male from middle Cretaceous Kachin amber in Myanmar","authors":"Qi Zhang , Ning Jia , Yizheng Li , Jianxun Wang , Alexander P. Rasnitsyn","doi":"10.1016/j.cretres.2024.106057","DOIUrl":"10.1016/j.cretres.2024.106057","url":null,"abstract":"<div><div>Falsiformicidae is a poorly known extinct family of aculeate wasps. It is known only as inclusions in various Cretaceous ambers. Brachypterous male <em>Falsiformix pedestris</em> Zhang and Rasnitsyn gen. et sp. nov. is described in the family Falsiformicidae based on a unique fossil from the middle Cretaceous Kachin amber. Occurrence and meaning of the male flightlessness in Hymenoptera is discussed. A combination of the flightless males with flying females occurs when mating takes place shortly after the eclosion, before adults disperse from confined space where they developed. An equally rare even if less exotic strategy with males and females both being flightless depends on the female pedestrian habits rather than on the pre-dispersal mating. Wide spatial (Angara Land, Laurussia Land and Gondwana Land) and narrow temporal distribution (Cenomanian and Turonian ages only) indicate Falsiformicidae as a possibly important stratigraphical indicator.</div></div>","PeriodicalId":55207,"journal":{"name":"Cretaceous Research","volume":"168 ","pages":"Article 106057"},"PeriodicalIF":1.9,"publicationDate":"2024-11-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143181848","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 : 2024-11-21DOI: 10.1016/j.cretres.2024.106056
Aijing Li , Baoxia Du , Jing Zhang , Jing Peng , Yiqiao Fu , Jingjing Cai , Mingyang Wei , Peihong Jin
Taxaceae is a special member of the Mesozoic flora mainly found in the Northern Hemisphere. However, Taxaceae fossils did not show abundance in the Mesozoic, particularly lacking twigs with information on reproductive organs. The new species Torreya jiuquanensis sp. nov. from the Lower Cretaceous of the Jiuquan Basin, Gansu, NW China provides valuable insights in seed-bearing structures of Torreya. Firstly, we present a comprehensive morphological description of Torreya jiuquanensis and it is distinguished from analogous fossils by more slender leaves and the obovate ovule. Secondly, phylogenetic analysis was utilized to determine that the position of Torreya jiuquanensis is located in the same clade as Torreya taxifolia. Meanwhile, the remarkable traits of Torreya jiuquanensis indicated that Torreya had demonstrated morphological stasis at least since the Early Cretaceous. Finally, through the examination of other genera within Taxaceae, it proposed that morphological stasis is not only observed in Torreya but also prevalent across nearly all genera of the Taxaceae, which are characterized by an evolutionary hysteresis. Moreover, a reinvestigation of the global fossil records and paleogeographic distribution of Torreya have revealed that Torreya was primarily restricted to the Northern Hemisphere in the Mesozoic, and multiple climate fluctuations were key drivers behind shifts in Torreya diversity and range migration.
{"title":"A new species Torreya with the seed-bearing structure from the Lower Cretaceous of northwestern China and its evolutionary significance","authors":"Aijing Li , Baoxia Du , Jing Zhang , Jing Peng , Yiqiao Fu , Jingjing Cai , Mingyang Wei , Peihong Jin","doi":"10.1016/j.cretres.2024.106056","DOIUrl":"10.1016/j.cretres.2024.106056","url":null,"abstract":"<div><div>Taxaceae is a special member of the Mesozoic flora mainly found in the Northern Hemisphere. However, Taxaceae fossils did not show abundance in the Mesozoic, particularly lacking twigs with information on reproductive organs. The new species <em>Torreya jiuquanensis</em> sp. nov. from the Lower Cretaceous of the Jiuquan Basin, Gansu, NW China provides valuable insights in seed-bearing structures of <em>Torreya</em>. Firstly, we present a comprehensive morphological description of <em>Torreya jiuquanensis</em> and it is distinguished from analogous fossils by more slender leaves and the obovate ovule. Secondly, phylogenetic analysis was utilized to determine that the position of <em>Torreya jiuquanensis</em> is located in the same clade as <em>Torreya taxifolia</em>. Meanwhile, the remarkable traits of <em>Torreya jiuquanensis</em> indicated that <em>Torreya</em> had demonstrated morphological stasis at least since the Early Cretaceous. Finally, through the examination of other genera within Taxaceae, it proposed that morphological stasis is not only observed in <em>Torreya</em> but also prevalent across nearly all genera of the Taxaceae, which are characterized by an evolutionary hysteresis. Moreover, a reinvestigation of the global fossil records and paleogeographic distribution of <em>Torreya</em> have revealed that <em>Torreya</em> was primarily restricted to the Northern Hemisphere in the Mesozoic, and multiple climate fluctuations were key drivers behind shifts in <em>Torreya</em> diversity and range migration.</div></div>","PeriodicalId":55207,"journal":{"name":"Cretaceous Research","volume":"168 ","pages":"Article 106056"},"PeriodicalIF":1.9,"publicationDate":"2024-11-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143181578","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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