Palaeogeography, Palaeoclimatology, Palaeoecology最新文献

{"title":"Quantitative study on the cave environmental factors for the fractionation of stable oxygen isotopes during the deposition of speleothem","authors":"Yue Jin ,&nbsp;Chun-Jie Wang ,&nbsp;Jian Zhang ,&nbsp;Wen-Jun Sun ,&nbsp;Chao-Jun Chen ,&nbsp;Yao Wu ,&nbsp;Hua-Yan Li ,&nbsp;Yue-Hua Xiang ,&nbsp;Yue-Yuan Lin ,&nbsp;Xin-Rui Ye ,&nbsp;Xin-Yan Li ,&nbsp;Zhong-Lin Deng ,&nbsp;Min Zhao ,&nbsp;Li-Juan Sha ,&nbsp;Ting-Yong Li ,&nbsp;Jun-Yun Li","doi":"10.1016/j.palaeo.2026.113616","DOIUrl":"10.1016/j.palaeo.2026.113616","url":null,"abstract":"<div><div>The speleothem δ¹⁸O record is an important archive for reconstructing paleoclimate changes. However, the complex interaction between environmental factors and kinetic fractionation processes poses challenges in interpreting paleoclimatic information from δ¹⁸O records in speleothems. Cave monitoring has been conducted during 2014–2023 in Furong Cave, southwest China, including the δ¹⁸O values and drip intervals of drip water, cave air temperature, partial pressure of carbon dioxide (<em>p</em>CO₂), and relative humidity (RH). The monitoring data are combined with the ISOLUTION model to explore the main controlling factors on δ¹⁸O during the process of calcite deposition. The results show that when the drip interval increases from 0 to 500 s, the δ¹⁸O values of speleothem increase rapidly by approximately 0.4‰. Based on the rigorous quantitative analysis, cave air temperature is established as one of the primary controlling factors on the δ¹⁸O values. The slope of the linear relationship between cave air temperature and the δ¹⁸O values of speleothem is −0.21‰/°C. However, the effects of cave <em>p</em>CO₂ and RH on the δ¹⁸O values of speleothem can be ignored in the cave systems with poor ventilation conditions. Based on this study, the influences of temperature sensitivity coefficients and drip interval thresholds on the stable oxygen isotope fractionation during the speleothem deposition which will assist in quantitative reconstruction of past temperature and precipitation from speleothem δ¹⁸O records.</div></div>","PeriodicalId":19928,"journal":{"name":"Palaeogeography, Palaeoclimatology, Palaeoecology","volume":"688 ","pages":"Article 113616"},"PeriodicalIF":2.7,"publicationDate":"2026-04-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146191931","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Millennial-scale hydroclimate variability of the Asian monsoon during MIS 9 from stalagmite records","authors":"Sinan Wang ,&nbsp;Xunlin Yang ,&nbsp;Hai Cheng ,&nbsp;Wenming Zhou ,&nbsp;Guofeng Li ,&nbsp;Wanli Xiang ,&nbsp;Rui Zhang ,&nbsp;R. Lawrence Edwards","doi":"10.1016/j.palaeo.2026.113606","DOIUrl":"10.1016/j.palaeo.2026.113606","url":null,"abstract":"<div><div>The evolution and millennial-scale variability of the Asian Summer Monsoon (ASM) during Marine Isotope Stage 9 (MIS 9) remain insufficiently constrained due to the limited availability of high-resolution archives. Here, we present a reconstruction of ASM dynamics between 340 and 285 ka BP, based on high-resolution (∼68-year) stalagmite δ¹⁸O records from Jinfo Cave, southwestern China. Results demonstrate that orbital-scale ASM variability was primarily modulated by Northern Hemisphere summer insolation, allowing subdivision into five substages: MIS 9e, MIS 9d, MIS 9c, MIS 9b, and MIS 9a. Synchronous comparisons with other speleothem datasets corroborate a spatial pattern characterized by pronounced variability in southwestern China and relative stability in the southeast. Within MIS 9c, three distinct millennial-scale weak monsoon events were identified, indicating substantial hydroclimate instability during interglacial conditions. Spectral analyses reveal dominant ∼2–4 kyr periodicities, analogous to Dansgaard–Oeschger (D<img>O) events of the last glacial period, likely linked to Atlantic Meridional Overturning Circulation (AMOC) instability under enhanced insolation forcing. Comparisons with MIS 5–4 highlight convergent responses in insolation-driven forcing, critical ice-volume thresholds, and monsoon evolution, suggesting an intrinsic propensity of the climate system toward quasi-cyclic oscillations.</div></div>","PeriodicalId":19928,"journal":{"name":"Palaeogeography, Palaeoclimatology, Palaeoecology","volume":"688 ","pages":"Article 113606"},"PeriodicalIF":2.7,"publicationDate":"2026-04-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146192502","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Climate variations over the past 6100 years in the high-altitude Central Himalaya","authors":"Suman Rawat ,&nbsp;Priyeshu Srivastava ,&nbsp;N.R. Phadtare ,&nbsp;A.P. Dimri","doi":"10.1016/j.palaeo.2026.113614","DOIUrl":"10.1016/j.palaeo.2026.113614","url":null,"abstract":"<div><div>In this study, we reconstruct high-resolution vegetation and climate variability over the past 6100 years using a multi-proxy approach (i.e., pollen, stable organic carbon isotopes (δ¹³C), and environmental magnetic parameters) from an alpine peat sequence of the Dayara meadow, located at ∼3430 m altitude in the upper Bhagirathi basin of the Central Higher Himalaya. The chronology of the studied lake-peat sequence, constrained by four radiocarbon (¹⁴C) ages, indicates that peat development in the region commenced around 6100 cal yr BP. Pollen combined with δ¹³C results reveal a significantly warmer and wetter climate between ∼6100 and 5300 cal yr BP, corresponding to the late phase of the Holocene Climate Optimum (HCO) in the upper Bhagirathi basin. Around ∼5300 cal yr BP, an abrupt climate shift occurred, which led to a prolonged dry spell between ∼4800 and 3400 cal yr BP. This dry spell was characterized by a decline in arboreal tree taxa, particularly <em>Quercus</em>, <em>Alnus,</em> and <em>Betula</em>, the complete disappearance of <em>Juglans,</em> and a notable increase in drought-tolerant herbs, such as Chenopodiaceae-Amaranthaceae and <em>Ephedra.</em> This prolonged cold-dry phase is correlated with a weakening of the Indian summer monsoon (ISM) intensity, as previously recorded in the core summer monsoon zone, in response to regional warming of the Indo-Pacific Warm Pool. Subsequent increase in arboreal tree taxa and moisture-loving pollen taxa, along with a reduced representation of drought-tolerant herbs, suggests a warm and wet climate between ∼3400 and 1600 cal yr BP (Roman Warm Period <em>∼</em>2200 to 1600 cal yr BP), ∼1000 to 500 (Medieval Climate Anomaly), and from ∼130 cal yr BP to the Present (Current Warm Period). In contrast, the intermittent periods between ∼1600 and 1000 (Dark Ages Cold Period) and ∼ 500 to 130 cal yr BP (Little Ice Age, LIA) were dominated by cold and drought-tolerant desert steppe vegetation. The highest concentration of pollen and fern, especially from sub-alpine tree taxa, between ∼6100 and 5300 cal yr BP, suggests an upward shift of the tree line beyond its modern-day position, reflecting optimal climatic conditions. Conversely, during the LIA, the tree line descended to its lowest elevation in the past ∼6100 years. The strengthened ISM episodes during the middle to late Holocene likely provided the moisture necessary for the glacier advances in the upper Bhagirathi catchment.</div></div>","PeriodicalId":19928,"journal":{"name":"Palaeogeography, Palaeoclimatology, Palaeoecology","volume":"688 ","pages":"Article 113614"},"PeriodicalIF":2.7,"publicationDate":"2026-04-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146192506","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Detrital zircon UPb and fission track double dating constraints on the exhumation history of Longmen Mountains: New insights into proto-Tibetan Plateau evolution","authors":"Xu Lin ,&nbsp;Siyu Han ,&nbsp;Lin Wu ,&nbsp;Marc Jolivet ,&nbsp;Dongliang Liu ,&nbsp;Zhonghai Wu ,&nbsp;Weiming Liu ,&nbsp;Jing Liu-Zeng","doi":"10.1016/j.palaeo.2026.113633","DOIUrl":"10.1016/j.palaeo.2026.113633","url":null,"abstract":"&lt;div&gt;&lt;div&gt;The existence of a Mesozoic proto-Tibetan Plateau remains a subject of ongoing debate due to the difficulty in constraining Tibet's paleotopographic evolution. The Longmen Mountains-Sichuan Basin system, located along the eastern margin of the Tibetan Plateau, was selected as the research object to investigate this issue. This study conducts systematic detrital zircon U&lt;img&gt;Pb and fission track double dating analyses on Cretaceous-Paleogene sandstone samples from the Shiyang section in the southwestern Sichuan Basin, aiming to: (1) reconstruct the Meso-Cenozoic exhumation history of the Longmen Mountains; and (2) explore the Mesozoic tectonic evolution patterns of the Tibetan Plateau through comparative studies with other systems, such as the West Kunlun-Tarim, Altun-Qaidam, and Qilian Mountains-Hexi Corridor. The Cretaceous strata within the Shiyang section of the western Sichuan Basin exhibit consistent detrital zircon U&lt;img&gt;Pb age distributions (&lt;em&gt;n&lt;/em&gt; = 388), characterized by five prominent age peaks: late Paleozoic-early Mesozoic (∼252–217 Ma), early Paleozoic (∼467–432 Ma), Neoproterozoic (∼779–732 Ma), and Paleoproterozoic-Neoarchean (∼1812–1675 Ma and ∼ 2540–2400 Ma). Moreover, the Paleogene strata contain five major age clusters (&lt;em&gt;n&lt;/em&gt; = 290): ∼275–247, ∼430–407, ∼807–622, ∼1770–1675, and ∼ 2430 Ma. These results indicate that the detrital zircons from both the Cretaceous and Paleogene successions in the Shiyang section were mainly sourced from the Longmen Mountains and the eastern Songpan-Ganze flysch fold belt. Analysis of 678 detrital zircon grains from Cretaceous to Paleogene strata in the Shiyang section reveals multiple magmatic age populations, with zircon fission track ages clustering in distinct intervals including the Neoproterozoic (658–595 Ma), Paleozoic (488–363 Ma), late Paleozoic (313–259 Ma), and Meso-Cenozoic (245–31 Ma). Zircon fission track age peaks spanning Neoproterozoic to Paleozoic (658–259 Ma) intervals document pre-Longmen Shan orogeny thermal events along the western Yangtze Craton margin. The Meso-Cenozoic zircon fission track age peaks (245–31 Ma) document episodic exhumation of the Longmen Mountains, with three principal phases identified. The earliest phase (245–223 Ma) corresponds to the Indosinian orogeny driven by Paleo-Tethys subduction, followed (187–86 Ma) by the Yanshanian orogeny associated with combined Paleo-Pacific back-arc compression and Neo-Tethys subduction. The youngest phase (64–31 Ma) reflects Himalayan orogenesis resulting from the India-Asia collision. When combined with published datasets, these results provide evidence for synchronous Mesozoic exhumation along the proto-Tibetan Plateau's northern, northeastern, and eastern margins. Integrated datasets reveal the development of an extensive Mesozoic proto-plateau system (&gt;1000 km wide) characterized by thickened crust (&gt;50 km) and elevated topography (&gt;1000 m), which emerged following the early Cretaceous Qia","PeriodicalId":19928,"journal":{"name":"Palaeogeography, Palaeoclimatology, Palaeoecology","volume":"688 ","pages":"Article 113633"},"PeriodicalIF":2.7,"publicationDate":"2026-04-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146192507","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Geomorphic development and controlling factors in the Eastern Pamir Syntaxis in a modern active tectonic setting","authors":"Junjie Shen ,&nbsp;Hong Chang ,&nbsp;Lu Peng ,&nbsp;Chen Panpan ,&nbsp;Chong Guan ,&nbsp;Peng Zhang ,&nbsp;Donglan Wei ,&nbsp;Qianyu Tang","doi":"10.1016/j.palaeo.2026.113615","DOIUrl":"10.1016/j.palaeo.2026.113615","url":null,"abstract":"<div><div>Understanding how interaction among tectonics, lithology, and climate shape landscapes in active orogens remains a central challenge in geomorphology. We quantify the controlling factors on geomorphic evolution in the Eastern Pamir Syntaxis, a tectonically active transition between the western Tibetan Plateau and Himalayan-Tibetan orogen, through hypsometric integral (HI) analysis and multivariate statistical techniques. The regional landscape has reached a mature stage, with a mean HI of 0.4249. Lithological erodibility (LE) emerges as the dominant control (Pearson's <em>r</em> = −0.312), exerting a primary influence on topographic development. Tectonic activity exerts a significant nonlinear effect: fault zones preserve relief and drive the reorganization of drainage networks. Climate acts as a secondary modulator, with mean annual temperature showing a more systematic correlation with HI than precipitation does. Principal component analysis identifies two orthogonal axes of control, hydroclimatic and tectono-lithologic, and interaction tests confirm significant nonlinear couplings among variables, particularly between LE and river network organization. Our results demonstrate that geomorphic evolution in this active orogen zone follows a hierarchical process structure: tectonic forcing establishes the structural framework, lithology determines erosional resistance, and climate regulates the efficiency of surface processes. This study provides a quantitative framework for disentangling the drivers of long-term topographic development in convergent orogenic settings.</div></div>","PeriodicalId":19928,"journal":{"name":"Palaeogeography, Palaeoclimatology, Palaeoecology","volume":"688 ","pages":"Article 113615"},"PeriodicalIF":2.7,"publicationDate":"2026-04-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146191877","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Skeletal-extension rates of Bermuda framework-building massive corals during the Holocene: Review and new data from rotary drilling","authors":"Eduardo Islas-Dominguez ,&nbsp;Eberhard Gischler ,&nbsp;J. Harold Hudson","doi":"10.1016/j.palaeo.2026.113589","DOIUrl":"10.1016/j.palaeo.2026.113589","url":null,"abstract":"<div><div>The skeletal-extension rates of the three main framework-building corals from the mid-late Holocene of Bermuda show distinct responses, either under the same environmental conditions, or within the same species under different conditions. <em>Diploria labyrinthiformis</em>, the only species found in both open and inshore-water environments, shows higher extension rates in the inshore waters of Castle Harbour (4.18 ± 0.56 to 5.55 ± 1.16 mm/year), compared to open water conditions at North Rock (2.53 ± 0.33 to 3.49 ± 0.68 mm/year). Some of these inshore extension rates also exceed those of the same contemporary species elsewhere in Bermuda and the Western Atlantic. Conversely, the extension rates of <em>Pseudodiploria strigosa</em> (2.71 ± 0.91 to 3.76 ± 0.68 mm/year), and the <em>Orbicella annularis</em> group (1.64 ± 0.32 to 2.75 ± 0.86 mm/year), are generally within the range of their contemporary counterparts in Bermuda but lower than those found in the Western Atlantic. Possible reasons for coral extension rate differences between locations including turbidity, water circulation, depositional energy, sediment-clearing abilities of corals, and temperature as well as relationship of coral extension growth to reef accretion are discussed.</div></div>","PeriodicalId":19928,"journal":{"name":"Palaeogeography, Palaeoclimatology, Palaeoecology","volume":"687 ","pages":"Article 113589"},"PeriodicalIF":2.7,"publicationDate":"2026-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146171276","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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 inverse temperature effect of precipitation stable isotopes poses a challenge to the paleoclimate reconstructions","authors":"Baijun Shang ,&nbsp;Tong Li ,&nbsp;Hui Gao ,&nbsp;Feng Wang ,&nbsp;Tonggang Fu","doi":"10.1016/j.palaeo.2026.113587","DOIUrl":"10.1016/j.palaeo.2026.113587","url":null,"abstract":"<div><div>Stable isotopes (δ¹⁸O and δD) in precipitation have long served as key proxies for paleoclimate reconstructions under the assumption of a universal temperature effect (TE), where isotopic enrichment correlates with warming. However, this study identifies clear inverse temperature effects (ITE)—where isotopic depletion accompanies higher temperatures—across different climate types and time scales. Analyzing global precipitation isotope data, this study finds that low-latitude regions exhibit significant monthly-scale ITE, expressed as a δ¹⁸O-temperature regression slope (δ-T_ITE) down to −0.46 ‰/°C in Tropical summer. Conversely, high latitudes (&gt; 40°N) maintain a clear TE, with a δ¹⁸O-temperature regression slope (δ-T_TE) up to 0.44 ‰/°C in Polar climate. The spatiotemporal variability in TE/ITE is driven by atmospheric circulation patterns: monthly-scale ITE in monsoon regions may be linked to moisture source shifts and convective precipitation dominance, whereas TE in high latitudes reflects direct temperature control on isotopic fractionation during condensation. Seasonal/interannual scales show weakened or insignificant TE/ITE in mid-low latitudes due to modulating effects of ENSO, monsoon dynamics, and the Intertropical Convergence Zone (ITCZ), which introduce other drivers like precipitation amount and vapour recycling. These results demonstrate that ignoring time-scale and climate-type dependencies may lead to unreliable paleoclimate reconstructions, while the identification of the ITE of stable isotopes provides a new perspective for stable-isotope based paleoclimate reconstruction research.</div></div>","PeriodicalId":19928,"journal":{"name":"Palaeogeography, Palaeoclimatology, Palaeoecology","volume":"687 ","pages":"Article 113587"},"PeriodicalIF":2.7,"publicationDate":"2026-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146080711","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Constraining the onset of carboniferous cyclicity in the Arkoma Basin of the Midcontinent, North America: Implications for calibrating a globally significant latest Bashkirian transgression","authors":"N. Griffis ,&nbsp;M. Dechesne ,&nbsp;T. Smith ,&nbsp;M. Hudson ,&nbsp;C. Henderson ,&nbsp;R. Mundil ,&nbsp;M. Shinn ,&nbsp;J.E. Birdwell ,&nbsp;L. Pianowski ,&nbsp;B. Lutz ,&nbsp;C. Mercer ,&nbsp;L. Morgan ,&nbsp;L. Spangler","doi":"10.1016/j.palaeo.2026.113610","DOIUrl":"10.1016/j.palaeo.2026.113610","url":null,"abstract":"<div><div>Cyclothems are defined by the repeat juxtaposition of littoral and open marine successions over short stratigraphic distances (meters to 10's of meters) and are interpreted to be driven by glacioeustatic forcing of sea level during the late Paleozoic Ice Age. The concept of cyclothems was defined in the Midcontinent region of the United States. However, correlating the Midcontinent region to other cyclic successions is difficult, which is the result of no geochronologic control for the Midcontinent biostratigraphic framework. We present the first high-resolution U<img>Pb zircon CA-ID-TIMS and feldspar ⁴⁰Ar/³⁹Ar age control for the onset of Midcontinent cyclothem deposition in the Arkoma Basin, Arkansas USA. Geochronologic control is obtained from a volcaniclastic unit preserved in the newly recovered Dare Creek #1 core. We integrate these data with biostratigraphic, lithostratigraphic and trace element analyses to investigate the timing, stratigraphic and geochemical response to late Paleozoic climate forcing. The lowermost Atoka Formation is associated with the onset of five high frequency transgressive-regressive cycles, which are defined by nearshore sandstones juxtaposed on top of offshore marine mudstones and are associated with changes in salinity and redox conditions. The Trace Creek Member of the lower Atoka Formation hosts a thick, organic-rich black shale, which defines the last and maximum transgression of the lower Atoka Formation in the Arkoma Basin, in the latest Bashkirian. Base-level records from time equivalent stratigraphic successions from Arrow Canyon, Nevada, U.S.A. and the Donets Basin, Ukraine also record a maximum transgression in the latest Bashkirian. The synchroneity of maximum flooding events from multiple basins which span the low latitudes in the latest Bashkirian support that cyclothem deposition was controlled by allostratigraphic forcing mechanisms, likely glacioeustatic forcing resulting from dynamic glaciation in high-latitude Gondwana.</div></div>","PeriodicalId":19928,"journal":{"name":"Palaeogeography, Palaeoclimatology, Palaeoecology","volume":"687 ","pages":"Article 113610"},"PeriodicalIF":2.7,"publicationDate":"2026-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146171206","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Middle Cambrian large bivalved arthropods from Shandong, North China and their paleogeographic implications","authors":"Zhixin Sun,&nbsp;Han Zeng,&nbsp;Fangchen Zhao","doi":"10.1016/j.palaeo.2026.113594","DOIUrl":"10.1016/j.palaeo.2026.113594","url":null,"abstract":"<div><div>The large bivalved arthropods <em>Isoxys</em> and <em>Tuzoia</em> were widely distributed in Cambrian marine environments, occupying important evolutionary and ecological positions in early arthropod history. Here, we systematically studied middle Cambrian <em>Isoxys</em> and <em>Tuzoia</em> from four Burgess Shale-type Lagerstätten localities in the Mantou (Wuliuan) and Zhangxia (Drumian) formations of Shandong Province, North China. This study describes <em>I. shandongensis</em> Wang and Huang in <span><span>Wang et al., 2010</span></span>, <em>I. longissimus</em> <span><span>Simonetta and Delle Cave, 1975</span></span>, <em>T. manchuriensis</em> Resser and Endo in <span><span>Resser, 1929</span></span>, <em>T. guntheri</em> <span><span>Robison and Richards, 1981</span></span> and a new species <em>T. wudangshanensis</em> sp. nov. The large bivalved arthropod assemblage from the upper Panchegou Member of the Zhangxia Formation (upper Drumian) represents the latest fossil record of <em>Isoxys</em> and <em>Tuzoia</em> worldwide. The first occurrences of <em>I. longissimus</em> and <em>T. guntheri</em> outside of Laurentia extend the known spatial and temporal distribution of these taxa, suggesting a strong paleobiogeographic affinity between North China and Laurentia.</div></div>","PeriodicalId":19928,"journal":{"name":"Palaeogeography, Palaeoclimatology, Palaeoecology","volume":"687 ","pages":"Article 113594"},"PeriodicalIF":2.7,"publicationDate":"2026-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146081177","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Stability and precision in chronostratigraphic definition: The Global Stratotype Section and Point (GSSP) is the solution [Palaeogeography, Palaeoclimatology, Palaeoecology, volume 685, 113515]: Reply (Cementing the Golden Spike)","authors":"David A.T. Harper ,&nbsp;Lucia Angiolini ,&nbsp;Charles M. Henderson ,&nbsp;Thomas Servais","doi":"10.1016/j.palaeo.2026.113618","DOIUrl":"10.1016/j.palaeo.2026.113618","url":null,"abstract":"<div><div>A comment on our original paper (<span><span>Davydov and Lucas, 2026</span></span>) provided two examples (Devonian/Carboniferous and Permian/Triassic boundaries) to support the assertion that a volcanic ash and its radioisotope date would be the best primary marker for GSSP proposals and correlation. We demonstrate that precise correlation of the base Carboniferous and base Triassic requires the use of all stratigraphic markers including radioisotope dates where available. We reply that there is no practical way to correlate a numerical age in many sections, and that attempting to do so conflates the essential separation of rock and time. However, volcanic ash beds and their ages, are recognized as essential tools for calibration and to test correlations.</div></div>","PeriodicalId":19928,"journal":{"name":"Palaeogeography, Palaeoclimatology, Palaeoecology","volume":"687 ","pages":"Article 113618"},"PeriodicalIF":2.7,"publicationDate":"2026-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146171208","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}