Taniel Danelian

University of Lille

The Frasnian–Famennian (Upper Devonian) siliciclastic sedimentary sequences of the Ertych section, located in south-central Armenia, yielded a relatively diverse and well-preserved marine phytoplankton assemblage consisting of acritarchs and prasinophytes. The former are represented by 19 species belonging to 10 genera; the latter comprise six spec...

Հոդվածում քննարկվում են Փոքր Կովկասի վերին դևոն-ստորին քարածխային նստվածքային հաջորդականություններից հայտնի Paraparchitidae և Geisinidae ընտանիքներին պատկանող օստրակոդների տեսակները` հաշվի առնելով ժամանակակից տաքսոնոմիական դասակարգումները և թարմացված շերտագրական կորելացիաները: Այս օստրակոդները հայտնի են Հայաստանի և Նախիջևանի վերին ֆամենից մինչև ստո...

A review of the paraparchitid and geisinid ostracod species known from the Upper Devonian–Lower Carboniferous sequences of the Lesser Caucasus is conducted here with respect to modern taxonomic assignments and updated stratigraphic correlations. These ostracods are known from the upper Famennian–lower Visean successions of Armenia and Nachichevan....

It remains unclear how radiolarian lineages adapted to the changing environments through the Guadalupian–Lopingian boundary (G-LB) interval. In this study, a well-preserved radiolarian fauna was obtained from silty cherts and siltstones deposited throughout the G-LB of the Sanpaoling, Yutouling, and Xiaqianling sections, located in Qinzhou City, Gu...

This paper presents the first contribution to the study of bryozoans from the Frasnian–lower Famennian successions of Armenia. The latter were examined in two distinct localities (Ertych and Noravank) of Central Armenia; abundant fragments of branched ramose and encrusting bryozoans were observed in them, belonging to the orders Trepostomata and Cr...

An assemblage of seven brachiopod species belonging to the orders Rhynchonellida, Atrypida and Spiriferida are studied from three localities (Ertych, Djravank and Noravank) of Central Armenia. The examined material is recovered from shallow water nodular limestones and provides insights into the diversity of Frasnian brachiopods on that part of the...

This is the English version manuscript of our paper 二叠系乐平统疑似罩笼虫(放射虫)在华南广西地区的发现及其演化意义 TENTATIVE NASSELLARIA (RADIOLARIA) REPORTED FROM THE LOPINGIAN (PERMIAN) OF GUANGXI, SOUTH CHINA AND ITS EVOLUTIONARY SIGNIFICANCE welcome to download and read it. Hope that will be helpful.

由于二叠纪罩笼虫化石材料极度稀缺，我们对罩笼虫从古生代向中生代类型演化的过程仍然一无所知。本文在广西晚二叠世大隆组与领薅组中报道了少量疑似罩笼虫化石。它们的形态简单，与三叠纪的罩笼虫属Bipedis形态相似，但缺少外饰，可能是中生代罩笼虫的先驱分子。如果本文描述的这些?Bipedis化石真属于罩笼虫目，那么该目从石炭纪晚期到二叠纪的演化可能经历了一段形态简化的阶段；在早三叠世，伴随其辐射过程，它们的形态也开始逐渐变得复杂。这些化石形态上介于古生代和中生代的罩笼虫之间，它们在吴家坪阶-长兴阶界线附近的出现可能是二叠-三叠纪之交深水放射虫由阿尔拜虫向罩笼虫动物群转变的序曲。 Our current knowledge of biostratigraphic, phylogenetic, and...

New field and petrographic observations, combined with whole rock and mineral geochemical analyses are applied on volcanic rocks present in the Dali sector, east of Lake Sevan (Armenia). A small-scale sampling of the volcanic sequence allows us to identify, for the first time in Armenian ophiolites, two groups of lavas (groups B and C1) stratigraph...

This study evaluates the application of artificial intelligence (AI) to the automatic classification of radiolarians and uses as an example eight distinct morphospecies of the Eocene radiolarian genus Podocyrtis, which are part of three different evolutionary lineages and are useful in biostratigraphy. The samples used in this study were recovered...

Middle Eocene deep-sea sediment sequences cored at Ocean Drilling Program Site 1260 (Leg 207; equatorial Atlantic Ocean) yielded diverse and abundant radiolarian faunas that are conducive to biostratigraphic and palaeoceanographic research, as well as to the study of radiolarian diversity dynamics during this epoch of significant climate changes. H...

The Tethyan geology of the Lesser Caucasus has a multiphase and complex history. The main lithotectonic domains that can be individualized during the presence of a Tethyan oceanic branch in the region are (i) the South Armenian Block (SAB), a Gondwanian remain that is mainly known by its characteristic Middle to Upper Palaeozoic sedimentary sequenc...

The Tethyan geology of the Lesser Caucasus has a multiphase and complex history. The main lithotectonic domains that can be individualized during the presence of a Tethyan oceanic branch in the region are (i) the South Armenian Block (SAB), a Gondwanian remain that is mainly known by its characteristic Middle to Upper Palaeozoic sedimentary sequenc...

The presence and diversity of polycystine radiolarians in the North-Eastern Mediterranean Sea is explored for the first time through the analysis of sinking particles obtained from sediment traps moored in three open marine sites. In total, thirty species are identified for which we provide appropriate references and illustrations to clarify the sp...

The Upper Devonian sedimentary sequences of Central Armenia, which mainly consist of shallow water, mixed carbonate-siliciclastic deposits, contain abundant and diverse brachiopods that are dominated by spiriferides. Based on newly collected material from the lower Famennian Aramazdospirifer orbelianus brachiopod zone (coeval to the Palmatolepis cr...

The new genus Aramazdospirifer n. gen. (Cyrtospiriferidae) is erected to include Spirifer orbelianus Abich, 1858 from the lower Famennian of Central Armenia as its type species and to refute long-standing claims related to the affinities of the latter. The micro-ornament and internal structure of this species are investigated and documented for the...

We here report and illustrate Middle and Late Devonian trilobites found in the sedimentary sequences of southwestern Armenia, represented by an unidentified proetid pygidium and a few phacopids, including the species Omegops cf. accipitrinus (Phillips, 1841). The Late Devonian stratigraphic and paleobiogeographic distribution of Omegops accipitrinu...

The Permian radiolarian zones and their correlations with conodont zones or other chronostratigraphic schemes are still under debate. In this study, four genera, twenty‐one species and two subspecies of radiolarians together with one genus and six species of conodonts were recovered from the Linghao Formation cropping out at the Longwangpo (LWP) se...

Enclosed in the Caucasian mountains, Armenia offers exceptional outcrops of Upper Palaeozoic sedimentary sequences. They are encountered mainly in the southern part of Central Armenia within the South-Armenian block of Gondwanan origin. These shallow marine series consist of mixed carbonate–siliciclastic deposits including sequences of limestones,...

Middle Oxfordian-early Kimmeridgian radiolaria, extracted from the top of radiolarites of Profitis Ilias unit (Rhodes island), suggest that the latter are essentially Middle Jurassic in age and the overlying siliceous shales Late Jurassic. The previously identified Calpionellid horizon at the top of Profitis Ilias siliceous marls is now regarded as...

Avec une histoire géologique complexe liée aux événements tectoniques majeurs de la mise en place du Caucase, l'Arménie offre des affleurements exceptionnels de séries sédimentaires du Dévonien supérieur. Ces séries sont particulièrement riches en organismes, notamment en brachiopodes ; elles sont susceptibles de fournir de précieuses informations...

The existing problems regarding the phylogenetic resolution of Ediacaran macroscopic organisms stem from a failure to factor-in the information captured through different ‘taphonomic windows’. Here we integrate the information from sandstone- and limestone-hosted occurrences of the fossil Palaeopascichnus linearis that together show a conspicuously...

The link between environmental perturbations, especially oceanic redox conditions, and evolution during the “Cambrian Biodiversification” event is still highly controversial, although this issue has attracted considerable attention for decades. We here report on the fossil record of the early Cambrian biota discovered in the uppermost Yanjiahe and...

The purpose of this paper is to present a revised classification of Paleozoic radiolarians at the genus level in the form of a series of plates displaying the images of the type species of each genus. These photos are supplemented by an indication of the status of the genus decided by an international team of specialists in this fossil group (Chapt...

The current knowledge of Paleozoic radiolarian ranges, proposed zonations, and faunal assemblages that have been used in biostratigraphy over the past few decades is compiled herein. More than 90 assemblages can currently be readily recognized and many of these, although regional in their construction, have elements that can be correlated throughou...

This chapter is to be used as companion text with the companion chapter, an illustrated catalogue of Paleozoic radiolarian genera found in this volume, and serves the purpose of giving the reader explanation for any taxonomic operations undertaken during the course of constructing the catalogue. These operations refer to the status of the genera as...

This paper summarizes and highlights the history of descriptive genus-level taxonomy on Paleozoic radiolarians grouped in five major phases: 1) initial discoveries in the 1890s; 2) ignored during the first half of the 1900s; 3) renewed interest during the 1950s to 1970s; 4) the “fast” years of the late 1970s to 1990s; and 5) the early 21st century...

Data analysis of all published and well-dated Silurian radiolarian localities was conducted with the goal of revealing long-term patterns in Silurian radiolarian biological diversity. The chronostratigraphic distribution of 161 species was compiled from 25 publications, each selected because of their independent age control. The pattern and dynamic...

Three significant mass extinctions and five mass depletions in biodiversity are currently accepted in the Phanerozoic marine fossil record. While some of these marine biodiversity crises seem to correspond to important extinctions on land it is unclear if the dynamics are always similar. Here we compare the trajectories of marine and terrestrial li...

This article has no abstract.

In the course of studying modern halotolerant microbial mats in salterns near the village of Kervalet, western France, we observed fanning-out and curved series of macroscopic ridges on the surface of a newly formed biofilm. The structure resembles the late Ediacaran fossil Arumberia which is globally distributed in Australia, Avalonia, Baltica, Si...

This paper discusses the fossil record, stratigraphy and sedimentary environments of lower Cambrian sequences that crop out in the Salair and Gorny Altai, southern part of western Siberia (Russia). Numerous and well-preserved archaeocyaths and a few small shelly fossils (SSF) have been discovered in carbonate sequences that crop out nearby the Gavr...

During the study of modern halotolerant microbial mats in salterns near the village of Kervalet, western France we observed fanning-out and curved series of macroscopic ridges on the surface on a newly formed biofilm. The structure resembles the late Ediacaran fossil Arumberia which is widely distributed in Australia, Avalonia, Baltica, Siberia and...

Radiolarians were recently discovered in the lower Eocene London Clay Formation of the London Basin from samples in a drainage borehole in the River Thames. They come from a c. 10m thick sequence of silty shales in the lower part of the formation. The radiolarians are, in general, rather poorly preserved, with the exception of six samples that yiel...

The Khoy region (NW Iran) is important in the clarification of the structural framework of the alpine belt between the Taurides, the Lesser Caucasus and theNWIran belt. The area is wellknown for these ophiolitic units. We present here new stratigraphic and structural data that can be used to reconstruct the tectonic evolution of this region and the...

Radiolarians are usually abundant in chert sequences and they have thus been widely used for the biostratigraphy of deep-water sediments. However, there are many difficulties in the correlation of radiolarian biostratigraphic schemes with the standard conodont zones. In this study, 21 radiolarian species were extracted from the Gufeng Formation tha...

The ostracod fauna of the Aisne quarry section (south-eastern border of the Dinant Synclinorium, Ardenne, Belgium) is studied here in order to complete the Middle Devonian record of these micro-crustaceans on the Ardennean platform, allowing thus biostratigraphic correlations at regional scale. Sixty-four ostracod taxa are recognized throughout the...

High-resolution sampling was performed on four Permian sections in Guangxi Province, South China (Gujingling, Sanpaoling, Guoyuan and Yutouling sections). We report abundant and well-preserved Guadalupian–Lopingian radiolarian assemblages, with 25 species belonging to three genera of the order Albaillellaria. Among them, the most abundant genus is...

Two new and relatively well-preserved radiolarian faunas were extracted from blocks included in the Cretaceous ophiolitic mélange unit that crops out in the Erakh area south of Yere-van, Armenia. One of these radiolarian assemblages was extracted from cherts that are in strati-graphic contact with variolitic lavas. This radiolarian assemblage sugge...

Abstract We report new observations in the Eastern Black Sea-Caucasus region that allow reconstructing the evolution of the Neotethys in the Cretaceous. At that time, the Neotethys oceanic plate was subducting northward below the continental Eurasia plate. Based on the analysis of the obducted ophiolites that crop out throughout Lesser Caucasus an...

This study provides a taxonomic treatment and comparison of Gorstian (Silurian) radiolarians recovered from two sections of the Cape Phillips Formation in the Canadian Arctic that accumulated in two different paleoenvironmental settings. Twilight Creek is more basinal, located ~100 km from the paleo-shelf margin, whereas Snowblind Creek is located...

Major ophiolitic thrust sheets are widespread within the internal Hellenides, particularly in the Pelagonian domain (Greece and Albania). The ophiolitic bodies are notably well exposed in western Othris mountains of continental Greece. In that area, the structural stacking of Jurassic obducted nappes is particularly well constrained. New sedimentol...

This study provides a taxonomic treatment and comparison of lower Gorstian (Silurian) radiolarians recovered from two sections of the Cape Phillips Formation in the Canadian Arctic that accumulated in two different paleoenvironmental settings. Twilight Creek is more basinal, located ∼100 km from the paleo-shelf margin, whereas Snowblind Creek is lo...

The Amasia ophiolite, situated at the northernmost corner of Armenia, is part of the Sevan–Hakari suture zone which links with the Izmir–Ankara–Erzinçan suture zone in northern Turkey. Three new radiolarian assemblages have been extracted from siliceous sedimentary rocks that accumulated on the Amasia ophiolite in an oceanic setting. Two of these a...

The scientific objectives is focused on the reconstruction of the tectonic and geodynamic evolution of the Khoy domain. Consequently the main tasks on the field were to: 1.Collect new petrological and geochemical data of Khoy ophiolites, in order to compare them with those we previously obtained (MEBE and DARIUS programmes, data published by our gr...

High-resolution sampling was performed on four Permian sections in Guangxi Province, South China (Gujingling, Sanpaoling, Guoyuan and Yutouling sections). We report abundant and well-preserved Guadalupian–Lopingian radiolarian assemblages, with 25 species belonging to three genera of the order Albaillellaria. Among them, the most abundant genus is...

A diverse and well-preserved radiolarian assemblage was extracted from a carbonate sample of latest Darriwilian age from the Shundy Formation of the Aksuran Mountain (North Balkhash Region, Kazakhstan). The fauna is represented by 32 species or morphotypes which belong to nine genera, four families and two orders (Spumellaria and Entactinaria), inc...

The papers included in this thematic issue were presented in the last two meetings of the Silicofossil Group of The Micropalaeontological Society (TMS; Lille in 2011; Cambridge in 2013). The variety and scope of work presented at these meetings highlights the breadth of research within the silicofossil community. The Silicofossil Group emerged with...

A moderately well-preserved radiolarian assemblage was recovered from organic-rich black chert in a Llandovery (Lower Silurian) sequence that crops out in southern Brittany (Chalonnes-sur-Loire section, Armorican Massif, France). The assemblage is composed of two families (Rotasphaeridae and Haplotaeniatidae), four genera (? Diparvapila, Secuicolla...

L’affleurement de Chalonnes-sur-Loire représente la série la plus complète du Llandovérien du Domaine ligérien (Massif armoricain, France nord-occidentale), avec environ 10 m de phtanites (jaspes lités, riches en matière organique) alternant avec des argilites noires à Graptolites, déposées au-dessus de diamictites glacio-marines de la glaciation h...

Upper Cambrian to Lower Ordovician pelagic carbonate rocks of the Cow Head Group in western Newfoundland (Canada) were sampled for the study of their radiolarian fauna. Well-preserved and diverse faunal assemblages were obtained from a number of levels of the Shallow Bay and Green Point formations. Three different assemblages, including a total of...

As global reconstructions for the Early Palaeozoic (Cambrian, Ordovician and Silurian periods) are now becoming more reliable, ancient atmospheric and oceanic circulation patterns may now be modelled with increasing confidence. Here we examine previous studies on Early Palaeozoic palaeoceanography. It is assumed that past circulation patterns were...

Well-preserved Late Norian Radiolaria were extracted from two pebbles of radiolarian chert included in Lower Miocene conglomerates of the Pentalofos Formation, in the area of Meteora (Mesohellenic basin, Greece). Both samples yielded a similar assemblage characterized by the presence of species Betraccium deweveri PESSAGNO & BLOME, Bipedis acrostyl...

Small shelly fossils (SSFs) are widely utilized for Cambrian biostratigraphy of shallow-water carbonates. The apparent linkage of SSFs to carbonate facies reflects an observational bias. Our study on the deeper siliceous facies of the Yangtze Craton in Zhejiang and Hunan provinces (China) reveals that SSFs also can be extracted from cherts. For thi...

The remnants of a Mesozoic oceanic realm exist in the Lesser Caucasus (mainly in Armenia and Karabagh); this realm was once part of the Tethyan oceanic branch positioned between Eurasia and the South-Armenian Block, a Gondwana-derived terrain that can be considered as part of the Tauride-Anatolide plate. The existing Tethyan rocks of Lesser Caucasu...