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Yuexiconcha nov. gen. – A resilifer-bearing palaeotaxodont (Bivalvia, Protobranchia) from the Ordovician of Guangdong, South China Yuexiconcha nov.gen.-华南广东奥陶纪的一个含古紫杉目(双壳目,原鳃亚目)的宿存植物
IF 1.6 4区 地球科学 Q1 Earth and Planetary Sciences Pub Date : 2023-12-01 DOI: 10.1016/j.geobios.2023.01.006
Niu Zhi-jun , Zhang Ren-jie , Paul A. Johnston , Li Chu-an , Wang Zhi-hong , Hu Kun , Song Fang , He Yao-yan , He Jin-lan , Lin Xiao-ming , Yang Wen-qiang

A unique, new palaeotaxodont (Protobranchia) genus and species, Yuexiconcha duplicata Zhang, Niu and Johnston, is proposed and described. It is characterized by: a medium-sized, transversely elongated, sub-elliptical shell; heterotaxodont dentition; and posterior tooth row consisting of crowded gradidentate dentition, partially and dorsally overlapped by an additional tooth row that emanates from the beak to form a bitaxodont dentition (new term). Most significantly, a prominent resilifer separates the anterior and posterior tooth rows and shows slight to moderate excavation into the hinge-plate. While a resilifer indicates phylogenetic proximity with Nuculoidea, Yuexiconcha nov. gen. is readily distinguished by its bitaxodont posterior dentition and a more elongate posterior shell lobe and so is provisionally placed in the Family Nuculidae, Order Nuculida. The hinge of Yuexiconcha nov. gen. indicates that a resilifer in palaeotaxodonts first developed in the Ordovician, rather than in the Silurian (Wenlock) as thought previously. Specimens described herein were collected from a fine-grained siliciclastic rock unit in the upper part of the Dongchong Formation in western Guangdong, South China. Other components of the biota occurring with the bivalves are uncommon and include trilobites and brachiopods that indicate a late Middle–early Late Ordovician (late Darriwilian–early Sandbian) age.

本文提出并描述了一个独特的古河口龙(原支龙)新属和新种--Yuexiconcha duplicata Zhang, Niu and Johnston。它的特征是:中等大小、横向拉长、近椭圆形的外壳;异喙齿;后齿列由拥挤的渐变齿列组成,部分和背面被从喙部延伸出来的附加齿列重叠,形成比特喙齿列(新术语)。最重要的是,一个突出的复齿将前后齿列分隔开来,并在铰链板上显示出轻微至中等程度的挖掘。虽然复齿表明它们在系统发育上与 Nuculoidea 属相近,但新属岳西孔雀鱼(Yuexiconcha nov. gen.Yuexiconcha nov.gen.的铰链表明,古齿兽中的resilifer最早出现在奥陶纪,而不是之前认为的志留纪(文洛克)。本文所描述的标本采集自华南粤西东冲地层上部的一个细粒硅质岩单元。与双壳类一起出现的其他生物群成分并不常见,其中包括三叶虫和腕足类,表明其时代为中奥陶世晚期-晚奥陶世早期(达里微期晚期-沙比期早期)。
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引用次数: 1
Middle Ordovician brachiopods from Tagoat, Co. Wexford, SE Ireland: Dapingian diversity drivers 爱尔兰东南部weexford Tagoat Co.的中奥陶世腕足类:大平纪多样性驱动因素
IF 1.6 4区 地球科学 Q1 Earth and Planetary Sciences Pub Date : 2023-12-01 DOI: 10.1016/j.geobios.2023.06.006
David A.T. Harper , Denis E.B. Bates

The Dapingian (Arenig) siltstones and sandstones of the Tagoat Group, County Wexford, SE Ireland, contain a well-preserved and diverse brachiopod fauna including a new genus of alimbellid, Palaeotagoatia (type species: Orthis Bailyana Davidson) together with the plectorthid Ffynnonia costata (Bates) hibernica nov. subsp. Of the 13 forms documented, at least six are conspecific with brachiopods from the upper Arenig (Dapingian-lowest Darriwilian) Treiorwerth Formation on Anglesey and a further two are identified with species occurring in the older Dapingian Carmel Formation. The faunal province affinities of the fauna are with those assemblages assigned to the peri-insular and marginal Celtic province and which occupied positions within the Middle Ordovician Iapetus Ocean between the Laurentian and Baltic platform provinces. More precise correlation of Middle Ordovician units suggests a significant species richness during the Dapingian-earliest Darriwilian and signalling also an early development of the Celtic province. But the shallow-water siliciclastic facies associated with these islands may also have influenced the distribution of some elements of the Celtic brachiopods and promoted the prevalence of coarse-ribbed orthides, such as Paralenorthis.

爱尔兰东南部韦克斯福德郡塔戈阿特组(Tagoat Group)的达平纪(阿雷尼格)粉砂岩和砂岩包含一个保存完好、种类繁多的腕足动物群,其中包括一个新的腕足动物属--Palaeotagoatia(模式种:Orthis Bailyana Davidson),以及桡足类 Ffynnonia costata (Bates) hibernica nov.在记录的 13 种形态中,至少有 6 种与安格尔西岛上阿雷尼格(大平期-达里维利期最低层)特雷奥韦尔斯地层中的腕足动物同属,另有 2 种与更早的大平期卡梅尔地层中的物种相吻合。该动物群的动物区系亲缘关系与那些被归入凯尔特周边地区和边缘地区的动物群系相近,这些动物群系占据了中奥陶世 Iapetus 洋中劳伦地台地带和波罗的海地台地带之间的位置。中奥陶世单元更精确的相关性表明,在大平洋-达里维利洋早期,物种非常丰富,这也标志着凯尔特省的早期发展。但是,与这些岛屿相关的浅水硅质岩层也可能影响了凯尔特腕足动物的某些成分的分布,并促进了粗肋腕足动物(如 Paralenorthis)的盛行。
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引用次数: 0
Latest Ordovician jawed polychaetes, chitinozoans and depositional environments of the Levín section, Prague Basin, Czech Republic 捷克布拉格盆地Levín剖面奥陶系最新颚形多毛体、几丁质动物及沉积环境
IF 1.6 4区 地球科学 Q1 Earth and Planetary Sciences Pub Date : 2023-12-01 DOI: 10.1016/j.geobios.2023.01.008
Petra Tonarová , Stanislava Vodrážková , Olle Hints , Jaak Nõlvak , Michal Kubajko , Pavel Čáp

Jawed polychaetes evolved and diversified extensively during the Ordovician. However, Ordovician polychaete jaws (scolecodonts) have remained poorly documented for many regions. This applies for the Prague Basin of peri-Gondwana, from where the previous study on Late Ordovician scolecodonts was published more than 70 years ago, with just two species preliminarily identified. The aim of the present paper was to fill this research gap and to study organic-walled microfossils from the boundary interval of the Králův Dvůr and Kosov formations (uppermost Katian and lowermost Hirnantian) at the Levín locality. As a result, a diverse assemblage of scolecodonts and chitinozoans was discovered. Chitinozoans are represented by at least 24 species from 15 genera, i.e., a relatively diverse assemblage whose species composition points toward the Ancyrochitina merga and Tanuchitina elongata biozones. The recovered jawed polychaete fauna contains at least 19 species from 14 genera. Taxa with labidognath and prionognath type maxillary apparatuses predominate in samples, whereas placognath and ctenognath taxa are relatively rare. A similar pattern is typical for the Laurentian samples but contrasts with the Baltic polychaete faunas. Polychaetaspids dominate in the Levín assemblage, followed by other families such as ramphoprionids, paulinitids, and atraktoprionids. The studied interval in the Levín section is represented by a succession of thin-bedded silty shales with diamictite beds, practically devoid of shelly fossils and with a variable degree of bioturbation. The deposits are interpreted as distal turbidites and debrites, reflecting sea-level changes driven by the growth and retreat of glacial ice and possibly also local tectonics. Reduced diversity and abundance of scolecodonts was recorded in the uppermost part of the Králův Dvůr Formation, which correlates with less bioturbation and finer silt fraction. The reported discovery shows wide geographical distribution and diversity of jawed polychaetes before and during the Hirnantian glaciation and mass extinction.

有颌多毛类动物在奥陶纪广泛进化和多样化。然而,在许多地区,奥陶纪多毛类动物的下颚(scolecodonts)仍然鲜有记载。近冈瓦纳布拉格盆地的情况也是如此,该地区之前关于晚奥陶世蜗牛虫的研究发表于70多年前,当时仅初步鉴定出两个物种。本论文旨在填补这一研究空白,研究列文地点克拉卢夫德武尔地层和科索夫地层(上卡蒂期和下希尔南期)边界区间的有机壁微小化石。因此,发现了多种鞘翅虫和壳质动物。甲壳动物至少有 15 属 24 种,也就是说,这是一个相对多样化的集合体,其物种组成指向 Ancyrochitina merga 和 Tanuchitina elongata 生物区。采集到的有颚多毛类动物群至少包含 14 属 19 个物种。在样本中,具有唇足类和朊足类上颚装置的类群占多数,而盘足类和栉足类则相对较少。劳伦西亚样本中也有典型的类似模式,但与波罗的海多毛类动物群形成鲜明对比。多毛类在列维集合体中占主导地位,其次是其他科,如 ramphoprionids、paulinitids 和 atraktoprionids。Levín 断面的研究区间由薄层淤泥质页岩和二叠纪岩床组成,几乎没有上层化石,生物扰动程度不一。这些沉积物被解释为远端浊积岩和碎屑岩,反映了冰川的消长所导致的海平面变化,也可能是当地构造作用的结果。在 Králův Dvůr 地层的最上部,记录到的瘰螈的多样性和丰度都有所降低,这与生物扰动较少和粉砂成分较细有关。报告中的发现表明,有颌多毛类动物在希尔南纪冰川期和大灭绝之前和期间的地理分布广泛且种类繁多。
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引用次数: 2
Babies from the Fezouata Biota: Early developmental trilobite stages and their adaptation to high latitudes 来自Fezouata生物群的婴儿:早期三叶虫发育阶段及其对高纬度地区的适应
IF 1.6 4区 地球科学 Q1 Earth and Planetary Sciences Pub Date : 2023-12-01 DOI: 10.1016/j.geobios.2023.06.005
Lukáš Laibl , Harriet B. Drage , Francesc Pérez-Peris , Sebastian Schöder , Farid Saleh , Allison C. Daley

The Lower Ordovician Fezouata Shale is renowned for its exceptionally-preserved euarthropod fossils including numerous species of trilobites, some of which show remains of appendages and traces of the digestive system. Herein, we describe the early developmental stages of at least nine trilobite species from the Tremadocian strata of the Fezouata Shale, namely Platypeltoides magrebiensis, Nileus deynouxi, Symphysurus ebbestadi, Asaphellus sp., Megistaspis (Ekeraspis) hammondi, Orometopus sp., Anacheirurus adserai, Bavarilla zemmourensis, Indiligens sp., and several specimens of undetermined protaspides. This study considerably expands our knowledge of the development of early Ordovician trilobites. The preservation of appendages in the early stages of N. deynouxi and S. ebbestadi, and remains of the digestive tract in the latter species, suggests that some immature trilobites had similar morphology and anatomy as the adult individuals. Early developmental stages of Indiligens sp. might have fed and/or hidden on graptolites and demosponges. The extraordinarily large size of the early post-embryonic stages of P. magrebiensis, S. ebbestadi, Orometopus sp., Asaphellus sp., and undetermined protaspides suggests that these trilobites might have hatched from yolk-rich eggs. The presence of several trilobite species with notably large post-embryonic stages in the Fezouata Shale might be explained by seasonal or low productivity in the high-latitude margin of Gondwana.

下奥陶世费祖阿塔页岩以其保存异常完好的类地行星化石而闻名,其中包括众多种类的三叶虫,有些化石还残留有附肢和消化系统的痕迹。在本文中,我们描述了费祖阿塔页岩震旦纪地层中至少九种三叶虫的早期发育阶段,它们分别是 Platypeltoides magrebiensis、Nileus deynouxi、Symphysurus ebbestadi、Asaphellus sp......、Megistaspis (Ekeraspis) hammondi、Orometopus sp.、Anacheirurus adserai、Bavarilla zemmourensis、Indiligens sp.这项研究大大扩展了我们对奥陶纪早期三叶虫发育的了解。N. deynouxi 和 S. ebbestadi 早期阶段附肢的保存以及后者消化道的残留物表明,一些未成熟的三叶虫具有与成年个体相似的形态和解剖结构。Indiligens sp.的早期发育阶段可能以石龙子和底栖海绵为食和/或藏身于其中。P. magrebiensis、S. ebbestadi、Orometopus sp.费祖阿塔页岩中存在几个胚后阶段明显较大的三叶虫物种,这可能与冈瓦纳高纬度边缘地区的季节性或低生产力有关。
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引用次数: 0
A new pustulose bivalve from the Late Ordovician of the Prague Basin (Czech Republic) and remarks on the diversification of pteriomorphids 捷克布拉格盆地晚奥陶世一种新的脓疱状双壳纲动物及其蕨类多样性的评述
IF 1.6 4区 地球科学 Q1 Earth and Planetary Sciences Pub Date : 2023-12-01 DOI: 10.1016/j.geobios.2023.04.001
Marika Polechová , Ondřej Zicha , Štěpán Rak

The new genus Alena Polechová, Zicha and Rak, with its type species Alena pustulosa nov. gen., nov. sp., is described from the Sandbian Letná Formation of the Prague Basin (Czech Republic) as a new Late Ordovician bivalve with pustules. Alena pustulosa nov. gen., nov. sp. appears to be an endobyssate bivalve based on its functional morphology. It is placed within Cyrtodontida (Pteriomorphia) and included in the diversified Modiolopsis draboviensis Association from the Letná Formation, which comprises eleven bivalve species. The bivalve association from the Letná Formation is formed predominantly by pteriomorphids (now six species out of eleven) and shows that pteriomorphian groups also radiated strongly in shallow-water sands and silts in mid-latitude areas. All main groups of Pteriomorphia are already known from the Early Ordovician and diversified rapidly during the Ordovician. The Gondwana and peri-Gondwana margins with two Early Ordovician radiation centers (Central Australia and Northwestern Argentina) played important roles in their early diversification and dispersion to other palaeocontinents. The function of the sculpture in bivalves is discussed with an emphasis on the Ordovician bivalves. The ornamentation in bivalves serves several purposes such as supporting the stable position of the shell in a substrate, helping in burrowing, strengthening of shell, and protecting against predators. In the Ordovician bivalves, the main function of the sculpture is to stabilise the shell in the substrate.

新属 Alena Polechová, Zicha 和 Rak 及其模式种 Alena pustulosa nov.Alena pustulosa nov.它被归入蝶形目(Cyrtodontida),并被纳入由 11 个双壳类物种组成的、来自 Letná Formation 的多样化 Modiolopsis draboviensis 协会。Letná地层的双壳类群主要由翼手目(11 个种类中现在有 6 个种类)组成,这表明翼手目类群在中纬度地区的浅水砂和淤泥中也有很强的辐射能力。所有主要的翼手目类群在早奥陶世时期就已为人所知,并在奥陶世时期迅速多样化。冈瓦纳和近冈瓦纳边缘地区与两个早奥陶世辐射中心(澳大利亚中部和阿根廷西北部)在翼手目早期多样化和向其他古大陆扩散的过程中发挥了重要作用。本文以奥陶纪双壳类动物为重点,讨论了双壳类动物雕刻的功能。双壳类动物的装饰有多种作用,如支撑贝壳在基质中的稳定位置、帮助钻洞、加固贝壳和抵御天敌。在奥陶纪双壳类中,雕饰的主要功能是将贝壳稳定在基质中。
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引用次数: 0
Tremadocian (Ordovician) trilobites from the Brabant Massif (Belgium): Palaeogeographical and palaeoecological implications 布拉班特地块(比利时)的Tremadocian(奥陶纪)三叶虫:古地理和古生态意义
IF 1.6 4区 地球科学 Q1 Earth and Planetary Sciences Pub Date : 2023-12-01 DOI: 10.1016/j.geobios.2023.04.003
Lukáš Laibl , Thomas Servais , Bernard Mottequin

A poorly diverse trilobite assemblage is described from the Tremadocian strata (Tangissart Member of the Mousty Formation; Chevlipont Formation) of the Brabant Massif. These specimens represent so far the oldest trilobite record from Belgium. The recorded taxa, identified as Platypeltoides cf. croftii, Macropyge? sp., and Asaphidae indet., resemble contemporaneous trilobites from other parts of Avalonia (e.g., Wales, Shropshire) as well as some others from high-latitude Gondwana (Morocco). The nileid species P. cf. croftii suggests that the Tangissart Member of the Mousty Formation was likely deposited in deeper offshore environments on the open shelf of Avalonia. Morphological similarities between P. cf. croftii from the Brabant Massif, P. croftii from the UK, and P. magrebiensis from Morocco suggest close faunal interchange across the narrow Rheic Ocean.

本文描述了来自布拉班特山丘的特雷玛多克纪地层(穆斯蒂地层的唐吉萨特层;切夫利蓬地层)的种类稀少的三叶虫组合。这些标本是迄今为止比利时最古老的三叶虫记录。所记录的类群被鉴定为 Platypeltoides cf. croftii、Macropyge? sp.和 Asaphidae indet.,它们与阿瓦鲁尼亚其他地区(如威尔士、什罗普郡)以及高纬度冈瓦纳(摩洛哥)的一些同时代的三叶虫相似。尼罗河三叶虫物种 P. cf. croftii 表明,穆斯蒂地层 Tangissart 组可能沉积在阿瓦鲁尼亚开阔陆架的近海深海环境中。Brabant Massif 的 P. cf. croftii、英国的 P. croftii 和摩洛哥的 P. magrebiensis 在形态上的相似性表明,狭长的莱茵洋上的动物群之间有着密切的交流。
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引用次数: 0
New machaeridian data from the Upper Ordovician of Scotland: Palaeoecological and global palaeobiogeographical implications 苏格兰上奥陶世马查里阶新资料:古生态学和全球古生物地理学意义
IF 1.6 4区 地球科学 Q1 Earth and Planetary Sciences Pub Date : 2023-12-01 DOI: 10.1016/j.geobios.2022.10.006
Yves Candela , Consuelo Sendino

New machaeridian material housed in the National Museum of Scotland alongside the type material held in the Natural History Museum London and the Sedgwick Museum of Earth Sciences, Cambridge, is documented here from the Ordovician of Girvan. The specimens are included in four taxa, three of these in open nomenclature. Syntypes and figured specimens of Plumulites scoticus by Nicholson and Etheridge (1879) and Withers (1926) are reviewed and the diagnosis emended. The description of these specimens follows standard terminology and we also introduce here a new terminology for Anterior Outer Shell Plate (AOSP). We also figure for the first time three unpublished letters from Mrs Elizabeth Gray to Thomas Henry Withers, where she criticises the illustrations of machaeridians published by Nicholson and Etheridge (1880) and Reed (1908), recognising issues identifying machaeridian plates and also clarifies a misunderstanding on some of the specimens described and illustrated in Reed (1908), being key for the distribution of Plumulites peachi. We assess the importance of machaeridians as part of the Lower Palaeozoic palaeobenthos and a key element of the palaeo-food chain. A review of the palaeogeographical distribution of the machaeridians is undertaken in the context of the Ordovician biodiversifications.

本文记录了苏格兰国家博物馆收藏的苏格兰奥陶纪新马氏体标本,以及伦敦自然历史博物馆和剑桥塞奇威克地球科学博物馆收藏的模式标本。这些标本被归入四个类群,其中三个类群的命名是公开的。对尼科尔森和埃瑟里奇(1879 年)以及威瑟斯(1926 年)所作的 Plumulites scoticus 样本和图解标本进行了回顾,并对诊断进行了修正。对这些标本的描述采用了标准术语,我们还在此引入了一个新术语 "前壳外板(AOSP)"。我们还首次刊登了伊丽莎白-格雷(Elizabeth Gray)女士写给托马斯-亨利-威瑟斯(Thomas Henry Withers)的三封未发表的信件,她在信中批评了尼科尔森和埃瑟里奇(1880 年)以及里德(1908 年)发表的大戟科动物插图,指出了大戟科动物板块的识别问题,并澄清了里德(1908 年)对一些标本的描述和插图的误解,认为这些标本是大戟科动物分布的关键。我们评估了大戟科动物作为下古生代古底栖动物和古食物链关键要素的重要性。在奥陶纪生物多样性的背景下,我们对大戟科动物的古地理分布进行了回顾。
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引用次数: 1
Ordovician chitinozoans and review on basin stratigraphy, biostratigraphy and paleobiogeography of northern Argentina along the Proto-Andean margin 阿根廷北部原安第斯边缘奥陶系壳虫与盆地地层学、生物地层学和古生物地理学综述
IF 1.6 4区 地球科学 Q1 Earth and Planetary Sciences Pub Date : 2023-12-01 DOI: 10.1016/j.geobios.2023.04.004
G. Susana de la Puente , Ricardo A. Astini

Ordovician strata exposed across the Cordillera Oriental and the Sierras Subandinas in northwestern Argentina were part of a large retroarc foreland basin developed along the Proto-Andean margin within the Central Andes in South America. A revised chitinozoan biostratigraphy along and across-strike for the Tremadocian, Floian, Dapingian, Katian and Hirnantian stages, calibrated with other fossil groups in the basin, allow pinpointing the most characteristic events that affected the basin fill testing global versus local controls in accommodation, and suggesting comparisons with other peri-Gondwanan records. According to the chitinozoan data, the glacially-related Ordovician deposits in northwestern Argentina are restricted to the Hirnantian, and unconformably overlie late Katian deposits. In the Caspalá area (Cordillera Oriental), an interval with synsedimentary deformation and reworked chitinozoans correlate with glacially-related deposits in other sites of the eastern part of the basin (Río Capillas and Mecoyita areas). A glacial waning stage is determined by a thin interval of organic‐rich black shales with sparse dropstones at the top of the Zapla Formation, containing Spinachitina oulebsiri associated with Desmochitina gr. minor, which together are typical latest Hirnantian components in other regions of Gondwana. Our study strengthens the foreland systems tract for the Ordovician Central Andean Basin with a volcanically fed interarc and foredeep depozone to the west (Puna region); a lower-accommodation forebulge depozone in the central area (mostly the Cordillera Oriental region); and a backbulge depozone (Sierras Subandinas and Sierras de Santa Bárbara) extending as far as the eastern Paraná Basin (reaching Paraguay and Brazil). Contemporaneous unconformities driven by global sea-level fluctuations were amplified or reduced due to deepening-narrowing or widening-shallowing, allowing contrasted accommodation, respectively associated to loading and relaxation. Ordovician chitinozoans from the Central Andean Basin indicate Northern, Western and peri-Gondwanan affinities, although locally some more cosmopolitan species described in Baltica, Avalonia and South China, are also recorded.

出露于阿根廷西北部东科迪勒拉山系和苏班迪纳斯山系的奥陶纪地层是南美洲中安第斯山脉内沿原安第斯边缘发育的大型弧后前陆盆地的一部分。经修订的壳质动物生物地层,包括特雷马多克期、弗洛期、达平期、卡蒂期和希尔南期,并与盆地内的其他化石群进行了校准,从而确定了影响盆地填充的最有特征的事件,检验了全球与当地的容纳控制,并提出了与其他近冈瓦纳记录进行比较的建议。根据壳质动物的数据,阿根廷西北部与冰川有关的奥陶纪沉积仅限于希尔南期,与晚卡蒂期沉积形成不整合。在卡斯帕拉地区(东科迪勒拉山系),一个具有合成沉积变形和重加工壳质动物的区间与盆地东部其他地点(卡皮亚斯河和梅科伊塔地区)与冰川有关的沉积相关。扎普拉地层顶部富含有机质的黑色页岩与稀疏的水滴石的薄层间隙确定了冰川消退阶段,其中含有与小Desmochitina相关的Spinachitina oulebsiri,它们共同构成了冈瓦纳其他地区典型的希尔南蒂晚期成分。我们的研究加强了奥陶纪中安第斯盆地的前陆系统圈层,即西部(普纳地区)有一个火山喷发的弧间和前深部冲积带;中部地区(主要是东科迪勒拉地区)有一个容积较小的前冲积带;后冲积带(Sierras Subandinas 和 Sierras de Santa Bárbara)一直延伸到巴拉那盆地东部(到达巴拉圭和巴西)。受全球海平面波动的影响,同时代的不整合地貌由于加深-变窄或加宽-变浅而被放大或缩小,从而形成了截然不同的容纳性,分别与加载和松弛有关。来自安第斯盆地中部的奥陶纪壳质动物表明它们与北部、西部和近贡嘎山地区有亲缘关系,不过也记录了一些在波罗的海、阿瓦鲁尼亚和华南地区发现的世界性物种。
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引用次数: 0
Ferruginous biolaminations within the pre-Hirnantian (Late Ordovician) of the Carnic Alps, Austria 奥地利卡尼阿尔卑斯山脉前希南阶(晚奥陶世)内的铁质生物层积
IF 1.6 4区 地球科学 Q1 Earth and Planetary Sciences Pub Date : 2023-12-01 DOI: 10.1016/j.geobios.2023.01.007
Annalisa Ferretti , Frédéric Foucher , Frances Westall , Luca Medici , Barbara Cavalazzi

Well preserved laminated structures occur within the Upper Ordovician of the Cellon section in the Carnic Alps (Austria), a world-famous reference section for Silurian conodont biostratigraphy. Microfacies from the Upper Ordovician Uqua Formation were characterised by using optical and scanning electron microscopy (SEM), an environmental scanning electron microscopy coupled with microanalyses (SEM/ESEM-EDX) and a confocal laser Raman microscopy. Ferruginous laminated structures overgrowing specific skeletal fragments occur in the lower part of the studied unit in the form of finely red-to greenish coatings composed of chamosite and goethite alternating with calcite bands. Laminae have arborescent to dendrolitic morphologies. Such morphologies suggest a biomediated genesis and the existence of a potential microbial factory acting in a nearby location from which coated material was later redeposited. These ferruginous coatings around organisms are not documented within the latest Ordovician Plöcken Formation at Cellon or in the coeval Wolayer Formation elsewhere.

奥地利卡尼阿尔卑斯山 Cellon 断面的上奥陶统中出现了保存完好的层状结构,该断面是世界著名的志留纪锥齿类生物地层学参考断面。通过使用光学和扫描电子显微镜(SEM)、环境扫描电子显微镜与微分析(SEM/ESEM-EDX)以及共焦激光拉曼显微镜,对上奥陶统乌夸地层的微地层进行了表征。铁锈色层状结构覆盖着特定的骨骼碎片,出现在所研究单元的下部,其形式为由方解石带交替组成的红绿相间的细微层状结构。层理具有树枝状到枝状形态。这种形态表明了生物成因,以及附近可能存在一个微生物工厂,涂层材料后来从该工厂重新沉积下来。在塞隆的奥陶纪晚期普洛肯地层或其他地方的共生沃拉耶地层中,都没有发现这些围绕生物的铁锈色涂层。
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引用次数: 0
The Ordovician bioclaustration revolution 奥陶纪生物地层革命
IF 1.6 4区 地球科学 Q1 Earth and Planetary Sciences Pub Date : 2023-12-01 DOI: 10.1016/j.geobios.2022.10.007
Olev Vinn , Mark A. Wilson , Andrej Ernst , Ursula Toom

There was a sudden increase in the diversity of bioclaustrations in the Sandbian (Late Ordovician) that continued somewhat more slowly in the Katian. The Sandbian was also the time when bioclaustrations became common, at least in Baltica. The major increase in the diversity of bioclaustrations in the Late Ordovician was an outcome of the GOBE, and we term it the Ordovician Bioclaustration Revolution. The Ordovician Bioerosion Revolution may partially be responsible for beginning of the Ordovician Bioclaustration Revolution in the Sandbian, as a number of these early bioclaustrations started their growth from initial borings. The diversification of bioclaustrations in the Sandbian involves mostly bryozoans and, to a lesser extent, brachiopods as hosts. The Katian increase in bioclaustration diversity involves mostly corals as the hosts and was likely unrelated or at least less influenced by the Ordovician Bioerosion Revolution. A new broadly conical bioclaustration, Kuckerichnus kirsimaei nov. cgen., nov. csp., is here described from the growth surfaces of hemispherical trepostome bryozoan colonies of Diplotrypa bicornis, Mesotrypa orientalis and Mesotrypa excentrica from the early Sandbian (Late Ordovician) of Estonia.

在砂迭纪(奥陶纪晚期),生物沉积物的多样性突然增加,而在卡蒂亚纪,这种增加的速度稍慢。至少在波罗的海地区,砂迭纪也是生物浮游生物开始普遍出现的时期。奥陶纪晚期生物沉积多样性的显著增加是全球生物多样性评估的结果,我们称之为奥陶纪生物沉积革命。奥陶纪生物侵蚀革命可能是砂岩奥陶纪生物群落革命开始的部分原因,因为许多早期的生物群落都是从最初的钻孔开始生长的。砂迭纪生物群的多样化主要以双壳类为宿主,其次是腕足类。卡蒂期生物寄生多样性的增加主要以珊瑚为宿主,很可能与奥陶纪生物侵蚀革命无关或至少受其影响较小。本文描述了一种新的宽圆锥形生物寄生虫--Kuckerichnus kirsimaei nov.
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