Cretaceous Research最新文献

{"title":"Angiosperm fossil woods, Cryptocaryeae (Lauraceae) and Cunoniaceae, with marine borers from Day Nunatak, Western Antarctica (Snow Hill Island Formation, Upper Cretaceous)","authors":"Roberto R. Pujana ,&nbsp;María B. Santelli ,&nbsp;Maximiliano J. Alvarez ,&nbsp;María E. Raffi ,&nbsp;Sergio N. Santillana","doi":"10.1016/j.cretres.2025.106146","DOIUrl":"10.1016/j.cretres.2025.106146","url":null,"abstract":"<div><div>We describe three fossil woods from Day Nunatak, Snow Hill Island collected from outcrops of the Snow Hill Island Formation (Campanian–Maastrichtian). The first specimen is assigned to <em>Longexylon oliveroi</em> gen. et sp. nov., a Cryptocaryeae (Lauraceae), which suggests an Antarctic origin of the <em>Beilschmiedia-Cryptocarya</em> clade. The second specimen is assigned to <em>Eucryphiaceoxylon eucryphioides</em>, which increases the number and biogeographical range of this common fossil-species of Antarctica and Patagonia. The third specimen, less well preserved, is tentatively assigned to the same fossil-species as the second. The three specimens show evidence of biodeterioration by marine wood borers assigned to the ichnospecies <em>Apectoichnus longissimus</em> and <em>Teredolites clavatus.</em> Some <em>T. clavatus</em> borings had subsequent colonization by marine agglutinating organisms. Two borings of one specimen preserved the valves of the borer organism, probably a pholadoid bivalve.</div></div>","PeriodicalId":55207,"journal":{"name":"Cretaceous Research","volume":"174 ","pages":"Article 106146"},"PeriodicalIF":1.9,"publicationDate":"2025-04-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143902073","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Turtles of the Aguja and Javelina formations, Upper Cretaceous (Campanian – Maastrichtian), west Texas","authors":"Thomas M. Lehman ,&nbsp;Susan L. Tomlinson ,&nbsp;Thomas A. Shiller II ,&nbsp;Steven L. Wick","doi":"10.1016/j.cretres.2025.106145","DOIUrl":"10.1016/j.cretres.2025.106145","url":null,"abstract":"<div><div>Freshwater turtles of the Aguja and Javelina formations include <em>Basilemys</em>, <em>Adocus</em>, <em>Compsemys</em>, and <em>Aspideretoides</em> which are widely distributed and have long ranges throughout Campanian-Maastrichtian strata in the Western Interior of North America. Several species with restricted ranges are however documented for the first time, including <em>Neurankylus baueri</em>, <em>Denazinemys nodosa</em>, and <em>Thescelus rapiens</em>. Fragmentary specimens also record an unidentified baenid, likely kinosternoids and chelydrids, and three trionychids other than cf. <em>Aspideretoides</em> spp. Specimens attributed to <em>Neurankylus baueri</em> are among the largest known. A <em>Neurankylus</em> specimen from the Javelina Formation likely represents a distinct unnamed late Maastrichtian species. <em>Thescelus rapiens</em> is reported for the first time outside of New Mexico. <em>Denazinemys</em> occurs throughout the Upper Cretaceous section, with the most complete specimens attributed to <em>D. nodosa.</em> The <em>Denazinemys</em> lineage was restricted to the southern part of the Western Interior throughout its history, and survived into late Maastrichtian time only in Texas. The Campanian turtle fauna is allied with those of northern Mexico, New Mexico, and Utah in the presence of bothremydids along with the baenids <em>N. baueri</em>, <em>D. nodosa</em>, and <em>T. rapiens</em>; together these comprise a distinct ‘southern’ Campanian assemblage. Maastrichtian turtles comprise a lower diversity fauna of mostly cosmopolitan taxa, as is also the case in correlative strata in New Mexico and Utah. This may reflect drier inland habitats represented in these ‘southern’ deposits, compared to coastal habitats that hosted a diverse endemic turtle fauna at northern sites bordering the remnant interior seaway at the end of Cretaceous time.</div></div>","PeriodicalId":55207,"journal":{"name":"Cretaceous Research","volume":"174 ","pages":"Article 106145"},"PeriodicalIF":1.9,"publicationDate":"2025-04-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143870057","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Maastrichtian climate of southern Patagonia (Argentina): An approach from paleosols of the dinosaur-bearing Chorrillo Formation","authors":"M. Sol Raigemborn ,&nbsp;Sabrina Lizzoli ,&nbsp;Damián Moyano-Paz ,&nbsp;Augusto N. Varela ,&nbsp;Daniel G. Poiré ,&nbsp;Valeria S. Perez Loinaze ,&nbsp;Ezequiel I. Vera ,&nbsp;Makoto Manabe ,&nbsp;Takanobu Tsuihiji ,&nbsp;Takashi Sano ,&nbsp;Fernando E. Novas","doi":"10.1016/j.cretres.2025.106144","DOIUrl":"10.1016/j.cretres.2025.106144","url":null,"abstract":"<div><div>The upper Maastrichtian dinosaur-bearing Chorrillo Formation in southern Patagonia (∼50° S, Austral-Magallanes Basin, Argentina) preserves successions of paleosols dominated by vertic features (i.e., the Argentino Lake hydromorphic Vertisols, the Perito Moreno Glacier calcic Vertisols, the Anita Farm Vertisols, the Centinela River Histosols, and the Chorrillo Malo Farm argillic Vertisols). To shed new light on and improve our understanding of the climate conditions that prevailed in southern Patagonia prior to the K/Pg extinction event, we used bulk geochemistry of the Chorrillo Formation paleosols to quantitatively reconstruct the latest Cretaceous climate at mid–high paleolatitudes of the Southern Hemisphere and compare them with late Maastrichtian global climate data derived from paleosols-based geochemical records. Bulk geochemical data indicate that pedogenesis occurred under moderate chemical weathering rates, which operated in a humid climate with a thermic regime (temperate-subtropical). These conditions align with previous qualitative interpretations based on macro- and micromorphological and mineralogical analyses of these paleosols, as well as palynological analyses of the Chorrillo Formation, which further demonstrate seasonality in rainfall. The climate data presented here are consistent with global paleoclimate reconstructions, where our study area (paleo-54° S) lies within the Maastrichtian paleo-Köppen climate zone “Temperate humid subtropical,” suggesting that during the Maastrichtian, subtropical conditions extended toward the poles by at least 22° of latitude in South America. This research provides new, relevant quantitative paleoclimatological data from the poorly constrained mid–high paleolatitudes of the Southern Hemisphere, refining current latest-Cretaceous climate reconstructions.</div></div>","PeriodicalId":55207,"journal":{"name":"Cretaceous Research","volume":"174 ","pages":"Article 106144"},"PeriodicalIF":1.9,"publicationDate":"2025-04-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143873633","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Microfacies and biostratigraphy based on calpionellids and calcareous dinoflagellate cysts across the Jurassic/Cretaceous boundary, western Neuquén Basin, Baños Morales and Lo Valdés formations, Río Volcán section, Central Chile","authors":"Diego A. Kietzmann ,&nbsp;Alfonso Encinas","doi":"10.1016/j.cretres.2025.106136","DOIUrl":"10.1016/j.cretres.2025.106136","url":null,"abstract":"<div><div>This study presents the first biostratigraphic analysis of calpionellids and calcareous dinoflagellate cysts in the Tithonian–Hauterivian Baños Morales and Lo Valdés Formations, which crop out in the Principal Cordillera of central Chile (34°S). Additionally, it provides a preliminary interpretation of the sedimentary environment based on microfacies analysis. The Baños Morales and Lo Valdés Formations form an ∼800 m thick succession of basinal marlstone, sandstone and limestone, shallow-water limestones and thick intercalations of lavas, which developed on the western margin of the Neuquén Basin. The Baños Morales and Lo Valdés Formations are characterized by an abundant fossil content, a remarkable stratigraphic continuity along several hundred meters, and include the Jurassic/Cretaceous boundary. The detailed study of its type section (Baños Morales town, Volcán river), allowed the identification of a moderately to poorly preserved association of seventeen calpionellid species and fifteen calcareous dinoflagellate cyst species and four subspecies. Six calpionellid biozones (<em>Chitinoidella</em>, <em>Crassicollaria</em>, <em>Calpionella</em>, <em>Calpionellopsis</em>, <em>Calpionellites</em> and <em>Tintinnopsella</em>) and eight calcareous dinoflagellate cyst biozones (<em>Committosphaera pulla</em>, <em>Crustocadosina semiradiata</em>, <em>Colomisphaera tenuis</em>, <em>Colomisphaera fortis</em>, <em>Stomiosphaerina proxima</em>, <em>Stomiosphaera wanneri</em>, <em>Colomipshaera vogleri</em>, and <em>Colomisphaera conferta</em>), already known from the Tethyan and Andean regions, have been identified, enabling a more precise stratigraphic calibration for the Baños Morales and Lo Valdés Formations, as well as their stratigraphic correlation with the stratigraphic units of Argentina and international time scales.</div></div>","PeriodicalId":55207,"journal":{"name":"Cretaceous Research","volume":"173 ","pages":"Article 106136"},"PeriodicalIF":1.9,"publicationDate":"2025-04-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143833200","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"New rebbachisaurid (Dinosauria, Sauropoda) from the Huincul Formation (upper Cenomanian-Turonian) of Villa El Chocón (Neuquén Province, Argentina)","authors":"María Edith Simón ,&nbsp;Leonardo Salgado","doi":"10.1016/j.cretres.2025.106137","DOIUrl":"10.1016/j.cretres.2025.106137","url":null,"abstract":"<div><div><em>Cienciargentina sanchezi</em> gen. et sp. nov. is a new rebbachisaurid sauropod dinosaur from the Late Cretaceous of Argentina. The new species is erected on the basis of a unique combination of characters that includes many autapomorphies, among them: cervical epipophyses absent, anterior dorsal centra amphicoelous to slightly opisthocoelous, posterior dorsal centrum slightly opisthocoelous, posterior dorsal neural spines anteroposteriorly extended, mid and posterior dorsal vertebrae with intrapostzygapophyseal lamina supporting the postzygapophyses from below, middle and posterior dorsal vertebrae with accesory spinodiapophyseal lamina, lateral laminae in anterior caudal vertebrae formed by the spinoprezygapophyseal lamina and the spinopostzygapophyseal lamina, which fuse at the middle of the neural spine, anterior caudal vertebrae with spinoprezygapophyseal lamina more robust than spinopostzygapophyseal lamina, anterior caudal transverse processes with a full suite of diapophyseal laminae (anterior centrodiapophyseal lamina, posterior centrodiapophyseal lamina, prezygodiapophyseal lamina, postzygodiapophyseal lamina), ratio of length to height of the posterior caudal vertebrae 5 or higher, forked chevrons without anterior and posterior projections, and femoral head dorsally directed, rising well above the level of the greater trochanter. This new species is added to the list of rebbachisaurid sauropods documented in the Huincul Formation (upper Cenomanian-Turonian), which are thought to be the latest diplodocoids at global level. In fact: from the Turonian onwards, sauropod communities are composed exclusively of macronarians, mostly titanosaurs. In Patagonia, particularly in the Huincul Formation, the hypothetical faunal turnover that occurred in the middle of the Cretaceous, which involved not only sauropods but other groups of dinosaurs, is observed, perhaps like nowhere else in South America.</div></div>","PeriodicalId":55207,"journal":{"name":"Cretaceous Research","volume":"173 ","pages":"Article 106137"},"PeriodicalIF":1.9,"publicationDate":"2025-04-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143842838","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"A unique association of fusioolithid dinosaur eggs from the Upper Cretaceous of Spain (Poyos, central system)","authors":"Fernando Sanguino ,&nbsp;Ane de Celis ,&nbsp;Raúl de la Horra ,&nbsp;Elena Fernández Fernández ,&nbsp;Javier Fernández Martínez ,&nbsp;Fátima Marcos-Fernández ,&nbsp;Adán Pérez-García ,&nbsp;Francisco Ortega","doi":"10.1016/j.cretres.2025.106122","DOIUrl":"10.1016/j.cretres.2025.106122","url":null,"abstract":"<div><div>The oological record from the late Campanian – early Maastrichtian Poyos fossil site (Guadalajara Province) within the Villalba de la Sierra Formation at the Iberian Ranges, is described here in detail for the first time. This site yields the southernmost and possibly the oldest occurrence of <em>Fusioolithus baghensis</em> in Europe, a widespread oospecies mainly found in mid to uppermost Maastrichtian deposits. The record from Poyos also allows the recognition of the second fusioolithid ootaxon from Europe, herein described as <em>Litosoolithus poyosi</em> oogen. et oosp. nov. This ootaxon is mainly characterized by very large eggs with a exceptionally thin eggshell compared to other ootaxa attributed to titanosaur sauropods. It also exhibits an unusually low porosity, and an eggshell composed of an uneven combination of two types of shell units which differ in their shape, dimensions, fusion degree, and absence or presence of a node. This new ootaxon also presents a dispersituberculated ornamentation that contrasts with the typical compactituberculated ornamentation of the <em>Fusioolithus</em> oogenus. The analysis of the spherolith dimensions of Fusioolithidae and Megaloolithidae ootaxa provides statistical support for discriminating <em>Litosoolithus poyosi</em> from other oospecies and for recognizing the differences between its two types of spheroliths. <em>Litosoolithus poyosi</em> and <em>Fusioolithus baghensis</em> co-occur on the same stratigraphic levels in Poyos which is, unlike the co-occurrence of megaloolithids or megaloolithids with fusioolithids, a rare occurrence in the global fossil record outside India. Therefore, the record of the Poyos site provides valuable data for ongoing discussions, allowing comparison with other similarly aged Ibero-Armorican formations.</div></div>","PeriodicalId":55207,"journal":{"name":"Cretaceous Research","volume":"174 ","pages":"Article 106122"},"PeriodicalIF":1.9,"publicationDate":"2025-04-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143864626","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Paleoenvironmental changes in the western Tethys carbonate platforms during OAE-2: Implications from phosphorus, δ18O, δ13C and facies analysis","authors":"Sahara Cardelli ,&nbsp;Barbora Křížová ,&nbsp;Michele Morsilli ,&nbsp;Renato Posenato ,&nbsp;Thierry Adatte ,&nbsp;Brahimsamba Bomou ,&nbsp;Jorge E. Spangenberg ,&nbsp;Lorenzo Consorti ,&nbsp;Amerigo Corradetti ,&nbsp;Marco Franceschi ,&nbsp;Valentina Brombin ,&nbsp;Gianluca Frijia","doi":"10.1016/j.cretres.2025.106133","DOIUrl":"10.1016/j.cretres.2025.106133","url":null,"abstract":"<div><div>Oceanic anoxic event 2 (OAE-2) is one of the largest paleoclimatic events of the whole Phanerozoic which occurred at the Cenomanian/Turonian Boundary (CTB). It caused major perturbation of the C-cycle at global scale together with changes in other geochemical cycles. OAE-2 severely impacted marine and terrestrial settings causing faunal turnovers both in pelagic and neritic environments. The exact mechanisms triggering OAE-2 are debated but it is believed that the main driver was a massive injections of volcanic CO₂ in the atmosphere. The effect of OAE-2 on deep-water communities has been extensively documented in literature. In contrast, less data are available for their shallow-waters counterparts. Geochemical and semiquantitative facies analysis on samples from two carbonate platforms located in Italy (former western Tethys) are presented in this paper, where new data from the Friuli-Adriatic Carbonate Platform are compared with a well-known section from the Apennine Carbonate Platform. Our data show a good correlation between these platforms, located 1000 km apart. Phosphorus concentrations are low except for two intervals: (1) at the onset of the OAE-2 and (2) in the late phase of the event. The δ¹⁸O record shows an increase of the Sea Surface Temperature (SST) during the event interrupted by a cooler interval. Our data indicate a correlation between geochemical changes and faunal turnover of benthic foraminifera and rudists, suggesting the co-occurrences of several causes for the demise of these groups during OAE-2.</div></div>","PeriodicalId":55207,"journal":{"name":"Cretaceous Research","volume":"173 ","pages":"Article 106133"},"PeriodicalIF":1.9,"publicationDate":"2025-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143808372","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"First gnathosaurine (Pterosauria, Pterodactyloidea) from the Early Cretaceous of eastern Thailand","authors":"Sita Manitkoon ,&nbsp;Rodrigo V. Pêgas ,&nbsp;Thanit Nonsrirach ,&nbsp;Prapasiri Warapeang ,&nbsp;Komsorn Lauprasert ,&nbsp;Uthumporn Deesri ,&nbsp;Sakboworn Tumpeesuwan ,&nbsp;Kamonlak Wongko ,&nbsp;Xuanyu Zhou","doi":"10.1016/j.cretres.2025.106135","DOIUrl":"10.1016/j.cretres.2025.106135","url":null,"abstract":"<div><div>Pterosaur fossils in the Mesozoic formation of Southeast Asia are very scarce. A few articles reported isolated teeth and a handful of postcranial elements in northeastern Thailand. Here we report on a pterosaur upper jaw from the Early Cretaceous at Phra Prong locality of eastern Thailand, which is considered the lateral equivalent of the Sao Khua Formation of the Khorat Group. This represents the first pterosaur cranial material in Thailand. It comprises a partial rostrum, preserving eleven tooth positions, and four associated tooth crowns. The anterior tip of the rostrum is dorsoventrally flattened and laterally expanded (spoon-shaped), indicating affinities to the Gnathosaurinae (Ctenochasmatidae). Alveoli borders are conspicuously scalloped and collar-like, and the palatal surface exhibits a pair of sinusoidal grooves. These features bear a strong resemblance to the Late Jurassic gnathosaurines <em>Gnathosaurus subulatus</em>, <em>Tacuadactylus luciae</em>, and <em>Lusognathus almadrava</em>. Our phylogenetic analysis indicates that the Thai pterosaur is closely related to these gnathosaurines. Still, the Thai gnathosaurine is unique in exhibiting a kite-shaped rostrum expansion and is recognized as a new taxon herein named <em>Garudapterus buffetauti</em> gen. et sp. nov. This new specimen provides essential information regarding pterosaurs, including updated data for a better understanding of their diversity and distribution throughout Southeast Asia.</div></div>","PeriodicalId":55207,"journal":{"name":"Cretaceous Research","volume":"173 ","pages":"Article 106135"},"PeriodicalIF":1.9,"publicationDate":"2025-03-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143799505","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"A giant spinosaurid from the Iberian Peninsula and new data on the Early Cretaceous Iberian non-avian theropod palaeodiversity","authors":"Erik Isasmendi ,&nbsp;Elena Cuesta ,&nbsp;Adrián Páramo ,&nbsp;Xabier Pereda-Suberbiola","doi":"10.1016/j.cretres.2025.106134","DOIUrl":"10.1016/j.cretres.2025.106134","url":null,"abstract":"<div><div>Despite some exceptional cases, the Lower Cretaceous theropod record from Iberia mainly comprises isolated teeth and fragmentary skeletons. In the Cameros Basin, theropods have been mostly documented in the Eastern Cameros sub-basin with baryonychine spinosaurids dominating this sector. Instead, theropods are rarer in the Western Cameros sub-basin. Here, we describe material from the Western Cameros sub-basin, recovered in the upper Hauterivian–lower Barremian Golmayo Formation of Soria (Los Caños and Zorralbo I sites), which allowed us to identify three early-branching tetanuran and three baryonychine dental morphotypes, and a large-sized spinosaurid from Zorralbo I. The latter is represented by cranial, axial, and appendicular bones, and identified as a large-sized baryonychine based on anatomical and phylogenetic studies. Our results demonstrate that the theropod assemblages are consistent within the entire Cameros Basin, exhibiting a dominance of baryonychines. Western Cameros theropods are not only limited to Baryonychinae but they would also coexist with other early-branching tetanurans and coelurosaurians. The Lower Cretaceous Iberian record is represented by taxa from all major clades within Theropoda (i.e., Tetanurae, Allosauroidea, Carcharodontosauria, Coelurosauria, Ornithomimosauria, Paraves and Dromaeosauridae), being Spinosauridae the most prevalent group, with five described genera and species and a large number of tooth morphotypes. Indeed, three spinosaurine and ten baryonychine tooth morphotypes have been identified in the Iberian record so far. This study demonstrates that the entire Cameros Basin has a great representation of the theropod record of the Iberian Peninsula, and it underscores the potential of this basin to understand the Iberian palaeobiodiversity, especially in spinosaurids.</div></div>","PeriodicalId":55207,"journal":{"name":"Cretaceous Research","volume":"173 ","pages":"Article 106134"},"PeriodicalIF":1.9,"publicationDate":"2025-03-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143808371","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"The Coniacian sequence in the western Iberian Ranges (Spain): Stratigraphic architecture, systems tracts, biostratigraphy and high-frequency cyclicity","authors":"Javier Gil-Gil,&nbsp;José Francisco García-Hidalgo,&nbsp;Carme Boix","doi":"10.1016/j.cretres.2025.106121","DOIUrl":"10.1016/j.cretres.2025.106121","url":null,"abstract":"<div><div>The Coniacian 3rd-order sequence comprises nine 4th-order parasequences (PsCo1–PsCo9). PsCo1 and PsCo2 are considered a Shelf Margin Wedge as in a Lowstand Systems Tract (LST). Parasequences PsCo3 to the lower part of PsCo6 show an aggradational and retrogradational geometry with onlap on the basal boundary, representing the Transgressive Systems Tract (TST). The upper part of PsCo6 to PsCo9 represents the Highstand Systems Tract (HST) with a Highstand Normal Regression (HNR), upper part of PsCo6 and PsCo7. PsCo8 and PsCo9 show a significative retrogradation of the outer ramp facies and a Forced Regressive Systems Tract (FRST) with progradation of siliciclastic facies from emerged massif on the carbonate facies. The rapid northwards progradation during HST originates a change from a homoclinal ramp to a distally-steepened one. The Coniacian–basal Santonian age is based on the presence of <em>Forresteria</em> (<em>Harleites</em>) <em>petrocoriensis</em> (base of PsCo1) and of <em>Cladoceramus undulatoplicatus</em> (top of PsCo9). <em>Metatissotia ewaldi</em>, <em>Tissotioides hispanicus</em>, <em>Gauthiericeras margae</em> and <em>Prionocycloceras iberiense</em> zones characterize the middle Coniacian. Finally, the late Coniacian is characterised by the <em>Protexanites burgeoisi</em> and <em>Hemitissotia</em> spp. zones. The parasequences are considered to have originated from long eccentricity cycles (0.405 Myr) of Milankovitch's band. Correlation and the reconstruction of the depositional architecture allow quantifying the sedimentary processes and trends, systems tracts, and temporal amplitude of hiatuses. The sequence at the northern outcrops spans 3.65 Myr, and only 0.81 Myr at the southern ones, with most time contained in the hiatuses of the basal (2.43 Myr) and upper (0.405 Myr) sequence boundaries.</div></div>","PeriodicalId":55207,"journal":{"name":"Cretaceous Research","volume":"172 ","pages":"Article 106121"},"PeriodicalIF":1.9,"publicationDate":"2025-03-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143759291","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}