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See detailPaleozoïc Palynology: a special issue in honour of Dr. Stanislas Loboziak
Steemans, Philippe ULg; Servais, T.; Streel, Maurice ULg

Book published by Elsevier (2002)

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See detailThe Middle Devonian plant Leclercqia (Lycopsida) in eastern Gondwana
Meyer-Berthaud, B.; Fairon-Demaret, Muriel ULg; Steemans, Philippe ULg et al

Conference (2002)

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See detailGeology, palaeobotany and palynology of the Northeastern part of the Ardenne, Belgium
Steemans, Philippe ULg; Vanguestaine, M.; Gerrienne, Philippe ULg

Book published by Paleopalyno. Paléobot. Micropal. (2002)

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See detailLlandovery miospore biostratigraphy and stratigraphic evolution of the Parana Basin, Paraguay - Palaeogeographic implications
Steemans, Philippe ULg; Pereira, E.

in Bulletin de la Société Géologique de France (2002), 173(5), 407-414

The Parana Basin covers 1,600,000 km(2) including parts of southern Brazil, Paraguay, Uruguay and Argentina. It contains rocks ranging from the Ordovician to Tertiary in age. The present study is focused ... [more ▼]

The Parana Basin covers 1,600,000 km(2) including parts of southern Brazil, Paraguay, Uruguay and Argentina. It contains rocks ranging from the Ordovician to Tertiary in age. The present study is focused on the Itacurubi Group, of Llandovery age, from Paraguay. The sedimentology and palynology have been studied in three boreholes from the central part of Paraguay. The Itacurubi Group consists of the Euzebio Ayala, Vargas Pena and Cariy Formations. It corresponds to a complete transgressive - regressive cycle with maximum flooding in the Vargas Pena Formation. The sediments of the group were deposited in a glacio-marine regime and are included in the second order sequence. The palynofacies are dominated by acritarchs and chitinozoans, with miospores rare. Among the latter, cryptospores are most abundant and trilete spores very rare. The miospore assemblages are typical of the Llandovery. The presence of Laevolancis divellomedia and the successive first occurrence of the trilete spore genus Ambitisporites, followed by Archaeozonotriletes, allow the recognition of three biozones : divellomedia I, divellomedia II and chulus-nanus. Correlations between the three boreholes based on miospore biostratigraphy and sequence stratigraphy techniques are similar. The miospore assemblages have important palaeogeographic implications: (1) Ordovician / Silurian miospore assemblages, identified in South America are similar to those described in palaeogeographically distinct regions such as China, UK, Belgium, USA etc. This suggests that the phytogeographical differentiation proposed by Gray et al. [1992], with a Malvinokaffric Realm characterised by smooth tetrads and an extra-Malvinokaffric Realm characterised by ornamented tetrads, has to be reconsidered. Clearly, the same miospores are recovered from both regions, no matter if they are close to the palaeo-equator or the palaeo-pole, as is the case in Paraguay. These findings suggest that the same vegetation could survive under various climates. (2) In theory, large oceans could be impassable geographic barriers for land plant miospores larger than 25 mum in diameter. As similar miospore assemblages occur, around the Ordovician - Silurian boundary, on the Gondwana, Avalonia and Laurentia plates, it seems likely that these palaeo-continental plates were in close proximity permitting the expansion of the vegetation through these continents. Therefore, palaeogeographic reconstructions with narrow oceans between the continents better explain early miospore biogeographies in early Silurian times. (3) Maps produced by Dalziel et al. [1994] better explain the diachronism of trilete spore first appearances Hirnantian in Turkey, Rhuddanian in Saudi Arabia, early Aeronian in Libya, late Aeronian in Paraguay, latest Aeronian in UK, and possibly Telychian in USA. (4) The Baltica plate could possibly have been isolated by a geographic barrier during the Ashgill and the Llandovery, as only simple naked tetrads are known from that plate. The first appearance of the trilete spores in Gotland during the early Wenlock could correspond to the end of this geographic isolation. This apparent isolation of the Baltica plate could be due to a lack of data. [less ▲]

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See detailAn Early Devonian flora, including Cooksonia from the Paraná Basin (Brazil)
Gerrienne, Philippe ULg; Bergamaschi, S.; Pereira, E. et al

in Review of Palaeobotany and Palynology (2001), 116

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See detailPalynological characterization and dating of the Tiangua Formation, Serra Grande Group, northern Brazil
Le Hérissé, A.; Melo, J. H. G.; Quadros, L. P. et al

in Melo, J.H.G.; Terra, G.I.S. (Eds.) Correlaçâo de Seqüências Paleozóicas Sul-Americanas (2001)

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See detailAdvances in Palaeozoic Palynology. PPMB Special Issue in Honour of Dr.Stanislas Loboziak. Abstract volume.
Steemans, Philippe ULg; Servais, T.; Streel, Maurice ULg

Book published by Paleopalyno. Paléobot. Micropal. (2001)

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See detailEarly Silurian miospores from the Paraná Basin, South America
Steemans, Philippe ULg; Pereira, E.

Conference (2001)

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See detailA miospore assemblage at the Siluro-Devonian boundary from the Tawil Formation, Qatif Field, Saudi Arabia
Steemans, Philippe ULg; Al-Ruwaili, M.; Filatoff, J. et al

Conference (2001)

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See detailIdentification du Silurien par Acritarches et Chitinozoaires dans le Boulonnais (Nord de la France): implications géodynamiques et paléogéographiques
Degardin, J. M.; Mansy, J. L.; Le Hérissé, A. et al

Conference (2001)

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See detailOrdovician cryptospores from the Oostduinkerke borehole, Brabant Massif, Belgium
Steemans, Philippe ULg

in Geobios (2001), 34(1), 3-12

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See detailQuelques spécimens exceptionnels de premières plantes terrestres découvertes au Brésil (Bassin du Paraná, Dévonien basal)
Gerrienne, Philippe ULg; Milagres, I.; Bergamaschi, S. et al

in Geo-Eco-Trop (2001), 25

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See detailMiospore Evolution from the Ordovician to the Silurian
Steemans, Philippe ULg

in Review of Palaeobotany and Palynology (2000, December), 113(1-3), 189-196

The definition of the term cryptospore is amended to include only spores thought to be produced by embryophytes and to exclude all enigmatic palynomorphs. Cryptospores are included here in the miospore ... [more ▼]

The definition of the term cryptospore is amended to include only spores thought to be produced by embryophytes and to exclude all enigmatic palynomorphs. Cryptospores are included here in the miospore group.The oldest published assemblage of typical cryptospores is Llanvirn in age. The evolution of cryptospore assemblages is very slow from the Llanvirn to the early Llandovery. The Telychian and Sheinwoodian stages are periods of drastic impoverishment in cryptospore biodiversity, followed by an important modification in miospore assemblages. This step in the evolution of the vegetation is correlated with the rapid transgression of seas on the continent during the early Llandovery. On the other hand, the Hirnantian glaciation does not affect diversity of the miospore assemblages. [less ▲]

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See detailDevonian miospore stratigraphy and correlation with the global stratotype sections and points.
Streel, Maurice ULg; Loboziak, S.; Steemans, Philippe ULg et al

in Bultynck, P. (Ed.) Subcommission on Devonian Stratigraphy. Fossil groups important for boundary definition (2000)

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See detailBiostratigraphical correlations of Early Devonian vertebrate assemblages of the Old Red Sandstone Continent
Blieck, A.; Cloutier, R.; Elliot, D. K. et al

in Blieck, A.; Turner, S. (Eds.) Palaeozoic vertebrate biochronology and global marine/non-marine correlation (final report IGCP 328, 1991-1996) (2000)

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See detailSupplements 2000
Basse, M.; Bender, P.; Blumenstengel, H. et al

in Turner, S.; Weddige, K. (Eds.) Devonian correlation table (2000)

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See detailSpore assemblages from the Silurian of Saudi Arabia
Wellman, C. H.; Steemans, Philippe ULg; Higgs, K.

Conference (2000)

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See detailSpore assemblages from a Silurian sequence in Borehole Hawiyah-151 from Saudi Arabia
Wellman, C. H.; Higgs, K. T.; Steemans, Philippe ULg

Conference (2000)

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See detailAnalysis of continental palynomorphs from the Llandovery in Saudi Arabia
Steemans, Philippe ULg; Higgs, K. T.; Wellman, C. H.

Conference (2000)

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