Florentin Paris

Florentin Paris
Université de Rennes 1 | UR1 · UMR CNRS 6118 - Géosciences Rennes

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249
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Publications

Publications (249)
Article
THE LOWER PALAEOLITHIC SITE OF PEN HAT (CROZON, BRITTANY) AND ITS REGIONAL STRATIGRAPHIC CONTEXT The two exceptional sites of Pen Hat and Trez Rouz (Crozon Peninsula, Brittany), and that of Trégana (North of the Brest Harbour, Brittany) are rare owing to the preservation of Pleistocene formations dated by infrared stimulated luminescence, electron...
Article
The recovered chitinozoan associations from the upper part of the Salar del Rincón Formation record the uppermost Ordovician–lowest Silurian deposits representing the postglacial stage of the late Hirnantian glaciation.
Article
A rare occurrence of a rich and diverse palynological assemblage from the Tawil Formation is described from well JLMD-EW-8 in northwestern Saudi Arabia. The composition of this assemblage strongly indicates a middle Přídolí age. The assemblage encountered contains very characteristic chitinozoans, acritarchs, tasmanitids, freshwater algae, scolecod...
Article
Chitinozoans from the Miaopo Formation (topmost Middle to lower Upper Ordovician) at Jieling, northern Yichang, western Hubei, were systematically studied, and 43 species of 16 genera were identified, which substantially increases the chitinozoan diversity of this particular time interval of the South China palaeoplate. Several key chitinozoan spec...
Conference Paper
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A distinctive, rich and diverse marginal marine palynological assemblage from the Tawil Formation occurs in several wells from northwestern and eastern Saudi Arabia. The composition of this assemblage strongly indicates a middle Přídolí age. The assemblage encountered contains abundant, miospores, chitinozoans, acritarchs, tasmanites, freshwater al...
Article
This contribution deals with the Middle to early Late Ordovician of the Armorican Massif (western France). The aim is to reconstruct a multi-order eustatic curve from the stratigraphic record. The studied section (Crozon Peninsula area) shows sediments deposited in tidal to storm-dominated shelf environments. A sequence analysis (facies and stackin...
Research
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Booklet with the main information on the chitinozoan group, including a technical card and direction for use
Article
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Glacial episodes have been linked to Ordovician–Silurian extinction events, but cooling itself may not be solely responsible for these extinctions. Teratological (malformed) assemblages of fossil plankton that correlate precisely with the extinction events can help identify alternate drivers of extinction. Here we show that metal poisoning may have...
Article
We date Late Ordovician preglacial deposits by mean of chitinozoans•We record damaged reworked chitinozoans in synglacial deposits•We date earliest Silurian postglacial deposits by mean of chitinozoans•Chitinozoan vesicles are an excellent carbon source for δ13C analysis
Poster
Chitinozoans are organic-walled microfossils that first appear in the Early Ordovician and diversify rapidly through the Paleozoic. They occur in a variety of marine paleoenvironments ranging from carbonate platforms to slope and basinal settings, but have an unknown taxonomic affinity. Along with graptolites and conodonts, chitinozoans are extreme...
Article
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The end-Ordovician was an enigmatic interval in the Phanerozoic, known for massive glaciation potentially at elevated CO2 levels, biogeochemical cycle disruptions recorded as large isotope anomalies and a devastating extinction event. Ice-sheet volumes claimed to be twice those of the Last Glacial Maximum paradoxically coincided with oceans as warm...
Article
This paper reports the discovery of Late Ordovician scolecodonts from the Qusaiba-1 core hole, central Saudi Arabia. The collection of about 100 relatively well preserved diagnostic jaws represents one of the richest jawed polychaete faunas from the Gondwanan realm and the first record of scolecodonts from the Arabian Peninsula. Scolecodonts were m...
Article
Sixty one core samples from three shallow core holes (Qusaiba-1, Baq’a-3 and Baq’a-4) penetrating the Qalibah Formation (Qusaiba Member) in North Central Saudi Arabia were investigated. These core slabs corresponding to grey-greenish hemipelagic shale or silty-shale yield well-preserved and very abundant early Silurian chitinozoans. Most of the rec...
Article
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Chitinozoans and graptolites are the main components of preserved Ordovician zooplankton. As with much of the modern plankton, the ‘first-order’ species distributions of Ordovician plankton reflect water masses defined on the basis of sea surface temperatures. For ‘time slices’ of less than a few million years, zooplankton distribution patterns can...
Article
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ABSTRACT—The genus Neseuretus Hicks, 1873 is the most abundant trilobite of the Ordovician siltite succession of the Andouill´e and Traveusot Formations in the French Armorican massif. The systematics of some species of Neseuretus is still unclear. Armorican and Iberian domains formed part of a distinctive paleobiogeographical province in the Ordov...
Article
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ABSTRACT—The genus Neseuretus Hicks, 1873 is the most abundant trilobite of the Ordovician siltite succession of the Andouill´e and Traveusot Formations in the French Armorican massif. The systematics of some species of Neseuretus is still unclear. Armorican and Iberian domains formed part of a distinctive paleobiogeographical province in the Ordov...
Article
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Well preserved assemblages of cryptospores, chitinozoans, acritarchs, leiospheres, tasmanitids, colonies of Gloeo-capsomorpha, scolecodonts and eurypterid fragments from 23 core samples of the Moussegouda core hole in the Erdi Basin, northern Chad, and from two samples from well KW-2 in Kufra Basin, South East Libya are investigated. These palynomo...
Article
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In the middle Armorican synclinorium the Lower, Middle and Upper Devonian are present in very variable thicknesses. The Lower Devonian can be recognized throughout the median synclinorium; the Middle Devonian is well developed in the west, while north of Rennes and in the east of the synclinorium it is very much reduced. The Upper Devonian crops ou...
Article
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The chitinozoan Conochitina aff. emmastensis Nestor, 1982 has been identified from the Silurian Telychian Stage, Llandovery Series, of Severnaya Zemlya, the Russian Arctic. Its presence suggests an early to late Telychian age for the strata, which is in accordance with previous biostratigraphic dating based on graptolites and conodonts
Article
This work presents palynological and palynofacies analyses from early Silurian Tanezzuft Formation shales recovered from core material of borehole CDEG-2a drilled in Dor el Gussa at the eastern margin of the Murzuq Basin, southern Libya. The material has yielded well-diversified palynomorph and chitinozoan assemblages and organic matter from a dept...
Article
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Studies of fossils collected from the Nictaux–Torbrook and Bear River synclines (Nova Scotia) allow a reexamination of the Siluro-Devonian stratigraphy of the Meguma terrane. The location of this terrane relative to the main paleocontinents of the circumatlantic domain during this period is discussed. Wenlockian, Ludlovian, and Pridolian biostratig...
Article
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Geological outcrops are of good quality along the foreshore and cliffs in Crozon Peninsula allowing the study of Paleozoic series of the Armorican Massif. The sedimentary and faunal evolution of this area is part of the history of the Gondwana margin and records the opening of the Rhéic Ocean, eustatic variations and paleogeographic migration from...
Conference Paper
The Severnaya Zemlya Archipelago is located north of the Taimyr Peninsula of eastern Siberia, separating the Kara and Laptev seas, two potentially vast and apparently different hydrocarbon provinces. A continuous succession of Neoproterozoic to late Palaeozoic strata and its position on the edge of the Eurasian margin make Severnaya Zemlya one of t...
Article
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Evidences of glaciation at the end of the Ordovician are widespread in western Gondwana. Some authors consider the glaciation was restricted to the Hirnantian time, but occurrences of glacial deposits in the Lower Silurian strata of South America indicate that the Gondwana glaciers did not completely disappear after the Hirnantian glaciation. In ad...
Article
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This study illustrates bathymetric trends across the northern Gondwana platform during the Ordovician. The sedimentary records of the Algerian Sahara, central Morocco, and western France are investigated to document related environmental changes through the period. Outcrop and subcrop sections have been selected with regard to their completeness an...
Article
Chitinozoans collected from upper Tremadocian to lower Floian strata of Chenjiahe section, Yichang, western Hubei, China comprise six species belonging respectively to the genera Euconochitina including a new species, Euconochitina fenxiangensis, Lagenochitina and Bursachitina, together with Desmochitina sp. and Eremochitina sp. The chitinozoan suc...
Article
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Our new data address the paradox of Late Ordovician glaciation under supposedly high pCO(2) (8 to 22x PAL: preindustrial atmospheric level). The paleobiogeographical distribution of chitinozoan ("mixed layer") marine zooplankton biotopes for the Hirnantian glacial maximum (440 Ma) are reconstructed and compared to those from the Sandbian (460 Ma):...
Article
The Early–Mid Ordovician has long been considered a super-greenhouse world, based largely on high relative global sea levels and light stable oxygen isotope data from bulk carbonates. An alternative and largely untested hypothesis has suggested that, at least in equatorial palaeolatitudes, there was a steady cooling trend through the Early Ordovici...
Article
Libya is one of the most hydrocarbon-rich countries in the world. Its large oil and gas reserves make it attractive to international oil and gas companies, which provide the impetus for field-based research in the Libyan Sahara. North Africa is made up of several enormous intracratonic basins, two of which are found in southern Libya: the Murzuq Ba...
Article
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Chitinozoans are considered as reproductive bodies of marine invertebrates, called chitinozoophorans. These chitinozoophorans were most likely to have been small, pelagic or necto-pelagic, soft-bodied, probably wormlike animals, and judging from the size of chitinozoans, they probably measured from a few millimetres to a few centimetres in length....
Article
During extensive investigations carried out recently on the chitinozoans from the Middle Ordovician Saih Nihayda Formation in the Sultanate of Oman, four new chitinozoan species have been discovered among classical Darriwilian components. These new chitinozoan species, Euconochitina sheridani sp. nov., Belonechitina ghabaensis sp. nov., Desmochitin...
Article
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Graptolites and their associated acritarch floras and chitinozoan faunas are described from three localities in Oman and the United Arab Emirates (UAE). They are characteristic of intervals of deeper water sediments in the Floian – Dapingian (Arenig, identified here as maximum flooding surface MFS O25) and mid Darriwilian (Llanvirn, MFS O30). These...
Article
Full-text available
Graptolites and their associated acritarch floras and chitinozoan faunas are described from three localities in Oman and the United Arab Emirates (UAE). They are characteristic of intervals of deeper water sediments in the Floian – Dapingian (Arenig, identified here as maximum flooding surface MFS O25) and mid Darriwilian (Llanvirn, MFS O30). These...
Book
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Le Massif armoricain (Ouest France) constitue le segment occidental de la Chaîne varisque qui s'étend jusqu'aux confins de l'Europe centrale (Figs. 1a-b). Le socle Protérozoïque est représenté par des formations d'âges Icartien (Protérozoïque basal) à Briovérien (Protérozoïque terminal - Cambrien) qui ont subi les évènements tectono-métamorphiques...
Conference Paper
La relative homogénéité de dépôts de plate-forme distale complique le décryptage sequential. L'identification des séquences génétique doit alors s'appuyer sur la reconnaissance de faciès de condensation liés à des épisodes de montée du niveau marin relatif. Sur les plates formes terrigènes, ces épisodes s'expriment par une diminution des apports si...
Conference Paper
Les témoins d'une glaciation à la fin de l'Ordovicien sont très répandus dans le nord Gondwana dans les dépôts hirnantiens où ils s'expriment notamment par des faciès glaciomarins (diamictites). Certains auteurs considèrent que la période glaciaire se restreint à l’Hirnantian cependant la présence de dépôt glaciaires en Amérique du Sud dans des for...
Article
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Colonization of the land by plants most likely occurred in a stepwise fashion starting in the Mid-Ordovician. The earliest flora of bryophyte-like plants appears to have been cosmopolitan and dominated the planet, relatively unchanged, for some 30 million years. It is represented by fossilized dispersed cryptospores and fragmentary plant remains. I...
Article
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In the SE of the Armorican Massif (France), the Ordovician-Silurian transition and the lower part of the Silurian are exposed at the locality Les Fresnaies at Chalonnes-sur-Loire. The Silurian graptolitic "phtanites" (black cherts) are richly fossiliferous. Detailed sampling allows a description of the graptolite faunas and a precise stratigraphica...
Article
Over the past three decades Ordovician pteraspidomorphs (armoured jawless fish) have been recorded from the fringes of the Gondwana palaeocontinent, in particular Australia and South America. These occurrences are dominated by arandaspid agnathans, the oldest known group of vertebrates with extensive biomineralisation of the dermoskeleton. Here we...
Article
A detailed study of chitinozoans based on a systematic bed-by-bed sampling of the Dawan Formation was carried out in the Yichang area (West Hubei, China) on two representative sections located at Chenjiahe and at Huanghuachang, where the GSSP of the base of the Dapingian (i.e. the base of the Middle Ordovician) has been defined. Four chitinozoan zo...
Article
Full-text available
Isolated chitinozoans from the Scorn Shale Member of the Cedarberg Formation, SW South Africa are described and provide,I date of the latest Hirnantian-earliest Rhuddanian. The recovered chitinozoans are typical of the latest Ordovician Spinachitina oulebsiri Biozone, although an earliest Silurian age is possible. They indicate a very short time sp...
Article
A 400 m thick clastic succession of Late Ordovician through Silurian age crops out in the Tazzeka Massif, eastern Morocco. Biostratigraphic data (chitinozoa, acritarchs) constrain these rocks to the Late Katian through Hirnantian (coeval with glaciation in Gondwana), with a ~ 8 Myr hiatus at the Ordovician–Silurian boundary. Sedimentological analys...