Journal of Palaeogeography最新文献

{"title":"Sedimentary distribution of evaporites in Wusongge'er Formation in central Tarim Basin and reconstruction of prototype basin","authors":"Qing Bian ,&nbsp;Ji-Biao Zhang ,&nbsp;Fan Feng ,&nbsp;Yang Li ,&nbsp;Chen-Jun Huang ,&nbsp;Tie-Yi Wang ,&nbsp;Kang-Kang Guo","doi":"10.1016/j.jop.2025.100296","DOIUrl":"10.1016/j.jop.2025.100296","url":null,"abstract":"<div><div>The Middle-Lower Cambrian Wusongge'er Formation in the Tarim Basin hosts extensive evaporite deposits, yet the formative processes of these evaporites under equatorial arid climates and their tectono-sedimentary implications remain poorly constrained. Previous studies, limited to low-resolution seismic data and outcrops in the northwestern margin, failed to resolve depositional variations in the central basin. This study aims to decipher the genetic mechanisms of evaporite precipitation and reconstruct the prototype basin's tectono-sedimentary evolution by integrating high-quality 3D seismic data (2023), geophysical forward modeling, and palaeogeographic reconstructions. Integrated analyses revealed a distinct zoned “west halite-east gypsum/dolomite” pattern driven by paleosalinity gradients in a semi-closed lagoon system, alongside an elongated reef body in the middle ramp and thrombolite buildups in the inner ramp. Evaporite distribution was dominantly controlled by equatorial aridity (climate) and fault-induced differential subsidence (tectonics), with the latter creating thickness variations exceeding 300 m. This study establishes a genetic model of evaporite sedimentation under the Cambrian greenhouse conditions, providing analogues for coeval evaporite systems in Gondwana. The restored prototype basin configuration reveals salt-driven sediment partitioning processes, offering new insights into the tectono-sedimentary evolution of intracratonic basins. While seismic interpretations face limitations in deep zones with scarce drilling data, this framework guides future ultra-deep exploration targeting salt-tectonized traps below 8000 m depth.</div></div>","PeriodicalId":100819,"journal":{"name":"Journal of Palaeogeography","volume":"15 1","pages":"Article 100296"},"PeriodicalIF":2.0,"publicationDate":"2026-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145322711","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Palaeoweathering and palaeoclimate of the Lower Cretaceous upper Xiguayuan Formation in the Luanping Basin, North China: Implications for early Aptian global cooling","authors":"Long Sun ,&nbsp;Sheng-He Wu ,&nbsp;Da-Li Yue ,&nbsp;Si-Chong Jiang ,&nbsp;Wei Du ,&nbsp;Li-Jun Yang ,&nbsp;Zhen-Hua Xu ,&nbsp;Ke Zhang","doi":"10.1016/j.jop.2025.100295","DOIUrl":"10.1016/j.jop.2025.100295","url":null,"abstract":"<div><div>The Early Cretaceous greenhouse climate was interrupted by multiple intermittent cold snaps such as the Valanginian cold snap and late Aptian climate cooling events, but there is currently a lack of terrestrial palaeoweathering and palaeoclimate records for the early Aptian climate cooling event. The relationship between the regional climate of terrestrial lake basins and the global climate during the early Aptian is still unclear. The Luanping Basin, which is located in the northeastern North China Craton (NCC) and contains Lower Cretaceous sediments with a maximum thickness of ∼3200 m, is an ideal place for analysing the terrestrial weathering and climate. Sixteen mudstone samples were collected from the Lower Cretaceous upper Xiguayuan Formation in the Luanping Basin. The mineral compositions and major, trace and rare earth element contents of the mudstone samples were quantitatively determined via X-ray diffraction (XRD), X-ray fluorescence (XRF), and inductively coupled plasma‒mass spectrometry (ICP‒MS), respectively. Elemental geochemical analyses were carried out to determine palaeoweathering intensity, palaeoclimatic conditions, and their relationships with the global climate. The variation trends in multiple chemical weathering indices are reconstructed after the interference of nonweathering factors is eliminated, reflecting that the source area has experienced mainly weak to moderate weathering. After evaluating the influences of carbonate-sourced elements, we infer that the regional palaeoclimate is arid and cold on the basis of the Sr/Cu ratio, Rb/Sr ratio, C-value, land surface temperature (LST), and mean annual temperature (MAT). All chemical weathering indices and palaeoclimate proxies exhibit similar trends. Moreover, the cooling of palaeotemperatures could have been a response to the early Aptian global cold snap. The regional climate of the Luanping Basin is controlled mainly by global climate change, which provides terrestrial weathering and climate records for the early Aptian global cooling event.</div></div>","PeriodicalId":100819,"journal":{"name":"Journal of Palaeogeography","volume":"15 1","pages":"Article 100295"},"PeriodicalIF":2.0,"publicationDate":"2026-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145322712","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Middle Devonian stromatoporoid-dominated reefs at Maoying, South China: New insights into age, biotic turnover and palaeogeographical model","authors":"Jia-Yuan Huang ,&nbsp;Wen Guo ,&nbsp;Yu-Cong Sun ,&nbsp;Wen-Kun Qie","doi":"10.1016/j.jop.2025.100315","DOIUrl":"10.1016/j.jop.2025.100315","url":null,"abstract":"<div><div>Middle Devonian was the time for extensive reefs across South China, but their importance in understanding the development of reef communities was undervalued. This study described the lithological and palaeontological features of the Middle Devonian reef deposits at Maoying Town, Guizhou Province, South China. Two different units are recognised based on five road-cut exposures. The lower unit is characterised by argillaceous limestone, yielding a variety of auto-to autoparabiostromes. The biostromes are dominated by morphologically diverse stromatoporoids, including <em>Gerronostromaria</em>, <em>Salairella</em>, <em>Synthetostroma</em>, and <em>Stachyodes</em>, with subordinate roles of tabulate corals, rugose corals, chaetetids, bryozoans, brachiopods, gastropods, bivalves, and tubeworms. The upper unit consists mainly of parabiostromes, characterised by abundant dendroid and bulbous stromatoporoids (<em>Amphipora</em>, <em>Stachyodes</em>, and <em>Actinostroma</em>), along with leperditicopid ostracods, parathuramminid foraminifers, and calcispheres. The environments of these two units are interpreted to be open marine and back-reef to lagoonal environments, respectively. Newly recognised icriodid and bipennatid conodonts from the lower unit and brachiopod <em>Stringocephalus</em> in the upper unit indicate a Givetian age of the entire succession, pushing back the age of the latter from Frasnian of the previous thought. Comparison with nearby two sections possibly reflects a palaeogeographical turnover from ramp to carbonate platform. This study sheds light on understanding how reef communities changed in relation to environmental conditions in South China during the expansion of global Givetian reefs.</div></div>","PeriodicalId":100819,"journal":{"name":"Journal of Palaeogeography","volume":"15 1","pages":"Article 100315"},"PeriodicalIF":2.0,"publicationDate":"2026-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145789811","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Sedimentology, provenance, and paleoclimate of Jurassic–Cretaceous red beds: Example from the southern front of the Central High Atlas and Northern Preafrican Trough, Morocco","authors":"Said Adardor ,&nbsp;Hicham Nasri ,&nbsp;Hamid Haddoumi ,&nbsp;Radouan El Bamiki ,&nbsp;Rachid Chennouf ,&nbsp;Hanane Miri","doi":"10.1016/j.jop.2025.100299","DOIUrl":"10.1016/j.jop.2025.100299","url":null,"abstract":"<div><div>Five stratigraphic sections from the Aghbalou N'Kerdouss–Tadighoust area were analyzed using integrated petrographic, granulometric, calcimetric, and mineralogical approaches applied to both bulk samples and clay fractions. The findings reveal a transitional depositional environment shaped by a dynamic interplay of continental and restricted marine influences, particularly within the Ifezouane Formation (Member 2), which reflects low-amplitude sea-level oscillations under confined paleoenvironmental conditions. Whole-rock mineralogy is dominated by quartz, K-feldspar, plagioclase, hematite, calcite, dolomite, siderite, and gypsum. The associated clay mineral assemblages comprise illite, kaolinite, smectite, and chlorite, with compositional variability across sections. Illite crystallinity and illite chemistry index data indicate a dual provenance, with sediment sources originating from both the Anti-Atlas and Sahara regions to the south, as well as the Jurassic uplands to the north. These interpretations are supported by petrographic evidence and mineralogical signatures. Furthermore, the mineralogical data suggest that arid to semi-arid climatic conditions and/or tectonic activity played a significant role during deposition. This study demonstrates how the integration of clay mineral signatures with petrography, grain-size distribution, and calcimetric data offers a reliable basis for reconstructing provenance, unraveling paleoenvironmental conditions, and refining palaeogeographic reconstructions of peri-Tethyan basins, while also providing a comparative framework applicable to analogous red bed systems worldwide.</div></div>","PeriodicalId":100819,"journal":{"name":"Journal of Palaeogeography","volume":"15 1","pages":"Article 100299"},"PeriodicalIF":2.0,"publicationDate":"2026-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145363887","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Effects of smectite-illitization and hydrocarbon generation on the pore structure: a case study from the continental shales in China","authors":"Dan-Ting Luo ,&nbsp;Jing Zhang ,&nbsp;Jing-Lan Luo ,&nbsp;Zi-Hui Feng ,&nbsp;Chao Deng ,&nbsp;Yu-Bin Bai ,&nbsp;Hong-Mei Shao ,&nbsp;Min Yan ,&nbsp;Ze Tan","doi":"10.1016/j.jop.2025.100298","DOIUrl":"10.1016/j.jop.2025.100298","url":null,"abstract":"<div><div>Pore structure of shale significantly affects the occurrence and reserves of natural gas and oil. At present, the quantitative characterization of pore structure related to clay minerals in high-clay continental shale remains inadequate. The mechanism of clay mineral transformation and pore preservation of continental shale is still unclear. To address this gap, an organic-rich, high-clay shale from the first member of the Qingshankou Formation (K₂qn₁) in the Gulong Sag, Songliao Basin, China, was analyzed, based on the measurement of argon ion polishing-field emission scanning electron microscopy (FE-SEM), X-ray diffraction (XRD), total organic carbon (TOC), vitrinite reflectance (Ro), pore structure parameters, and fractal dimension obtained from the isothermal N₂ adsorption experiment, integrated with well logging data. Quantitative characterization of the modification on shale pore structure by smectite illitization and hydrocarbon generation from organic matter was conducted. The primary factors influencing pore structure, and pore preservation mechanism were then elucidated. Research result shows that the mesopores (2–50 nm) formed during smectite illitization and micropores (&lt;2 nm) produced by hydrocarbon generation from the organic matters significantly contributed to the pore volume and specific pore surface area of the shale. The microcrystalline quartz, formed in the smectite illitization, caused the loss of some pores, but the rigid frame composed of the microcrystalline quartz, as well as the overpressure generated partly by hydrocarbon generation from organic matter and partly by smectite-to-illite transformation, preserved some pores. This work highlights that smectite illitization and hydrocarbon generation from organic matter are crucial mechanisms for pore formation and preservation in continental shale with a high content of clay minerals.</div></div>","PeriodicalId":100819,"journal":{"name":"Journal of Palaeogeography","volume":"15 1","pages":"Article 100298"},"PeriodicalIF":2.0,"publicationDate":"2026-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145322714","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Late Jurassic manganese microbial carbonates of West Siberian oil and gas basin: Diagnostic features, environmental sedimentation, secondary transformations","authors":"Latypova Margarita ,&nbsp;Gafurova Dina ,&nbsp;Churkina Valeria ,&nbsp;Kalmykov Anton ,&nbsp;Kalmykov Georgy","doi":"10.1016/j.jop.2025.100316","DOIUrl":"10.1016/j.jop.2025.100316","url":null,"abstract":"<div><div>This study focuses on the investigation of Late Oxfordian–Early Tithonian manganese microbial carbonates (MC) found at the top of the Georgiev regional stage in the Western Siberian oil and gas basin. In some isolated areas, these MC are oil reservoirs. However, these rocks are still one of the least studied sediments in the carbonate interval at the boundary of the Bazhenov and Georgiev subregional stage. We have described their geochemical, lithological and mineralogical composition in detail. Based on the characteristics of MC, we assumed their formation settings. The elevated MnO content, associated with microbial processes, and the high concentration of biophilic elements, both suggest the active involvement of organic matter in the formation and development of microbial sediments. The isotopic composition of carbon in the microbial carbonates further supports a biogenic source of carbon dioxide playing an important role in the formation of these deposits. We have established that the Late Jurassic manganese MC were intensely secondary altered, partially recrystallized and calcified by catagenetic processes. Isometric pyrite crystal aggregates with kutnohorite fragments were formed at the contacts between kutnohorite and calcite zones. We suggest that the presence of caverns and high reservoir potential in the microbial carbonates from the Yem-Egovskaya field of the Krasnoleninsky arch may be attributed to intense secondary catagenetic alterations.</div></div>","PeriodicalId":100819,"journal":{"name":"Journal of Palaeogeography","volume":"15 1","pages":"Article 100316"},"PeriodicalIF":2.0,"publicationDate":"2026-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145736711","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Petrofacies and reservoir quality of the Tortonian Sandstone reservoirs, north Kutei Basin, East Kalimantan","authors":"Kuntadi Nugrahanto ,&nbsp;Ildrem Syafri ,&nbsp;Adjat Sudradjat ,&nbsp;Budi Muljana ,&nbsp;Munji Syarif","doi":"10.1016/j.jop.2025.100284","DOIUrl":"10.1016/j.jop.2025.100284","url":null,"abstract":"<div><div>The Anamta field, the focus of this study, is a prolific hydrocarbon discovery in the offshore Kutei Basin, having yielded over 900 million barrels of oil equivalent (mmboe) from the Miocene fluvial-deltaic sandstone reservoirs. One fifth of the total current producing wells drain gas from the deepest under-optimized Basal Tortonian Sandstones (BTS). Increased burial depth and change toward distal sandstone facies within the overall progradation package in the study area have always been considered detrimental to the flowability of deep Tortonian reservoir target. The objectives of this study are to integrate the parasequence sets and detrital mineral composition of the Tortonian Sandstones in order to build petrofacies units and articulate them with reservoir quality characterization based on the key physical properties of the sandstones, with specific focus placed on the BTS as the object of this study. Biostratigraphic markers in the wellbores were tied to seismic data to define depositional systems tracts of highstand (HST) 01, 02, 03, lowstand (LST), transgressive (TST), and HST 04 and 05. QFL analysis of 77 thin sections and XRD reveals a shift from sublitharenite in the basal part to feldspathic litharenite and litharenite toward the upper Tortonian Sandstones. Qm-F-Lt, Qm-P-K, and Qp-Lv-Ls ternary plots indicate recycled-orogen provenance. By integrating the analyses of systems tracts and provenance with detailed descriptions of facies from core data, three distinct petrofacies were defined: (1) Basal, (2A) Middle, and (2B) Upper Tortonian Sandstones that hereinafter referred to as BTS, MTS and UTS. Principal component analysis (PCA) upon these petrofacies identified that permeability, siderite, and kaolinite are the key principal components (PC), while K-means clustering confirmed Petrofacies-1 is a high-quality reservoir with permeability ranging in 28–211 milli-Darcy (mD) and porosity between 12 % and 20 %. It is characterized by sublitharenite composition, minimal siderite/kaolinite, and fine- to slightly medium-grained size. These findings highlight Petrofacies-1 as a promising deep target for future delineation and exploration.</div></div>","PeriodicalId":100819,"journal":{"name":"Journal of Palaeogeography","volume":"14 4","pages":"Article 100284"},"PeriodicalIF":2.0,"publicationDate":"2025-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145324557","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Cryo-paleosols and paleoclimate/cosmic archives in the Dry Valleys, Antarctica","authors":"William C. Mahaney ,&nbsp;Peeter Somelar","doi":"10.1016/j.jop.2025.100291","DOIUrl":"10.1016/j.jop.2025.100291","url":null,"abstract":"<div><div>Perhaps the most obscure and overlooked paleoenvironmental resource in Antarctica is the cryosol-paleosol record of the Dry Valleys, and the cryo-stratigraphy of the Palmer Peninsula, East Antarctica, and the islands. The Scientific Committee on Antarctic Research (SCAR) Committee in 2014 outlined a forward look for new initiatives and of the six priorities, the ‘Reveal Antarctica’s History’ focused on ‘rock and sediment records to know whether past climate states are fated to be repeated’. Of all the records available to us across the continent, the thinnest and most obscure, are found within cryo-paleosols and accompanying clastic rinds, the latter often embedded in pavements capping these ancient sentinels. An ancient pedostratigraphy, extending horizon group-to-horizon group reported here, offers unexpectedly strong post-∼15 Ma weathering and salt accumulation, interrupted by a recent airburst, presumably the BM (black mat) of 12.8 ka. Evidence for a cosmic event comes in the form of melted/welded, air-quenched, dendritic, Pt (Ir) coated, organic-fused grains and highly sheaved and plate-uplifted mineral surfaces. As shown here, Antarctic paleosols, housing both oxidized and Na-encrusted beds, shed light not only on paleoclimatic/ecologic histories that might be repeated, but this one cometary occurrence, reported for the first time in any Dry Valley paleosols, may well occur again, the next time with enough energy to destroy Earth’s atmosphere.</div></div>","PeriodicalId":100819,"journal":{"name":"Journal of Palaeogeography","volume":"14 4","pages":"Article 100291"},"PeriodicalIF":2.0,"publicationDate":"2025-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145219189","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Devonian-Carboniferous paleosols and tectonics of northwest China","authors":"Xue-Lian Guo ,&nbsp;Gregory J. Retallack ,&nbsp;Shuang Dai","doi":"10.1016/j.jop.2025.100287","DOIUrl":"10.1016/j.jop.2025.100287","url":null,"abstract":"<div><div>Paleosols in the Late Devonian (Famennian) Shaliushui and Qianheishan formations near Pingchuan, in northeast Gansu, China, are characterized petrographically and chemically to reconstruct paleoenvironments early in the evolution of forests on Earth. The Devonian paleosols, analogous to Neogene paleosols in the Lesser Himalaya of India, formed within the outwash plain of an extremely high (5–8 km elevation) mountain range on the North Qilian Block resulting from continent–continent collision in North China. Such high paleoaltitude is evidenced by Devonian paleosols exhibiting unusually thick horizons of subsurface calcareous nodules, as evidence of inferred mean annual precipitation range of 107 ± 22 mm. These conditions are comparable to those observed in paleosols from India, where monsoonal seasonality is driven by extreme elevation differences. Depth to Bk (calcic horizon) corrected for burial compaction of the paleosols reveals semiarid mean annual precipitation (MAP) of 361 ± 147 mm, with some subhumid outliers of 563 ± 147 mm. Chemical composition of the paleosols is evidence of subhumid (MAP 572 ± 182 mm, but up to 936 ± 182 mm) and temperate climates (MAT 12.5 ± 4.4 °C, but up to 14.9 ± 4.4 °C). Such cool temperatures at low paleolatitude (5-20°) are additional evidence of high elevation of at least 1 km. The vegetation consisted of Devonian pteridophytic progymnosperms, evidenced by rare foliar spurs and common woody root traces.</div></div>","PeriodicalId":100819,"journal":{"name":"Journal of Palaeogeography","volume":"14 4","pages":"Article 100287"},"PeriodicalIF":2.0,"publicationDate":"2025-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145157622","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Paleoenvironmental reconstruction and sequence biostratigraphy of Miocene transgressive–regressive sedimentary succession in the northern JDA, northern Malay Basin","authors":"Fatin Nur Adilah Md Idris ,&nbsp;Khairul Azlan Mustapha ,&nbsp;Fatin Izzati Mihnat ,&nbsp;Zainey Konjing","doi":"10.1016/j.jop.2025.100273","DOIUrl":"10.1016/j.jop.2025.100273","url":null,"abstract":"<div><div>The northern sector of the Malay Basin has long been underrepresented, leaving a gap in the understanding of its paleoenvironmental evolution. In addressing this gap, detailed biostratigraphic analysis based on palynology and foraminifera from two wells, i.e., Tj-1 and Tp-1, has been conducted to reconstruct the paleoenvironment during the Miocene age. The factors influencing their distribution were analyzed using a sequence biostratigraphic approach, complemented by environmental parameters such as grain size and organic matter content, supported by seismic and gamma ray logs. The findings reveal significant differences in the faunal distribution of the inner shelf and delta front between the two studied wells. The inner shelf in Tj-1 well is dominated by <em>Asterorotalia pulchella</em> and the accessory species <em>Pseudorotalia schroeteriana</em>. Whereas Tp-1 well, is dominated by <em>Pseudorotalia schroeteriana</em>, but <em>Asterorotalia pulchella</em> is absent. For delta front species, <em>Bigenerina</em> sp. and <em>Reophax</em> sp. are found throughout Tp-1 well. However, in Tj-1 well, the dominant assemblages are <em>Bigenerina</em> sp. and <em>Miliammina</em> sp. during Serravallian to Tortonian, and <em>Cavarotalia annectens</em> from Tortonian to Messinian. Furthermore, our study identifies a major transgressive–regressive (T–R) event during Langhian to Serravallian period, inferred from stratigraphic dating using the standard palynological zonation of Malay Basin (‘PR’ zone) with the age according to VIM (Vietnam–Indonesia–Malaysia) and SEA (Southeast Asia) cycles, which also highlights unconformities. This suggests that tectonic events have led to distinct fauna provinces within the Miocene biostratigraphic assemblages.</div></div>","PeriodicalId":100819,"journal":{"name":"Journal of Palaeogeography","volume":"14 4","pages":"Article 100273"},"PeriodicalIF":2.0,"publicationDate":"2025-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144739523","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}