   Devonian miospores from northwestern Gondwana; Steemans, Philippe  in Palaeontology (in press) Detailed reference viewed: 30 (5 ULg) Climate-controlled palynofacies and miospore biostratigraphy of the Early Devonian Jauf Formation, northern Saudi Arabia; ; et al in GeoArabia (in press) The Jauf Formation miospore succession is synthesized in terms of paleoenvironments and sequence stratigraphy. The data set for this study is obtained from four overlapping, continuously cored, and ... [more ▼] The Jauf Formation miospore succession is synthesized in terms of paleoenvironments and sequence stratigraphy. The data set for this study is obtained from four overlapping, continuously cored, and extensively sampled, boreholes that for a 940 ft composite section. The Jauf Formation ranges in age from late Pragian to latest Emsian. The palynological assemblages, recognized herein, provide the basis for recognizing depositional environments present in the Early Devonian of northern Saudi Arabia. Transgressive – regressive cycles are indicated, not only by lithology but by marked changes in the marine to terrestrially dominated palynological assemblages. Flooding events are recognized by the replacement of spore dominated assemblages by organic-walled microphytoplankton. The maximum flooding interval for the Jauf is reinterpreted based on a correlative event consisting of diverse acritarchs and abundant chitinozoans. [Add details on the paly and sequence stratigraphy here. No.cycles and order.] The new northern Gondwanan biozonation developed by Breuer and Steemans (2012) and used here allows a high-resolution regional biozonation for the Arabian Plate and more intercontinental [?] correlation of the Jauf Formation with other Gondwanan and Euramerican localities. One new spore genus (Zonohilates) and four spore species (Insculptospora maxima, Camarozonotriletes alruwailii, Devonomonoletes crassus and Zonohilates vulneratus) are newly proposed. [less ▲] Detailed reference viewed: 29 (4 ULg)PalyWeb: a "lazzarus" palynomorph database project on the web; Steemans, Philippe ; et alin AASP Newsletter (2012), 45(2), 18-21 Detailed reference viewed: 16 (2 ULg)Palaeozoic Innovations in the Micro- and Megafossil Plant Record: from the Earliest Plant spores to the Earliest SeedsSteemans, Philippe ; Petus, Elodie ; et alin Talent, John (Ed.) Global Biodiversity, Extinction Intervals and Biogeographic Perturbations Through Time (2012) Detailed reference viewed: 34 (9 ULg)Diverse assemblages of Mid Devonian megaspores from LibyaSteemans, Philippe ; ; Petus, Elodie et alin Review of Palaeobotany and Palynology (2011), 165 [en] A restudy of Devonian palynological assemblages of samples from the A1-69 borehole, drilled in the Ghadamis Basin, western Libya, North Africa has led to the discovery of numerous well-preserved ... [more ▼] [en] A restudy of Devonian palynological assemblages of samples from the A1-69 borehole, drilled in the Ghadamis Basin, western Libya, North Africa has led to the discovery of numerous well-preserved megaspores amongst abundant miospores, rare acritarchs and rare chitinozoans. Thirteen samples from base to top, 1496 ft (456 m) up to 965 ft (294 m), contain the richest Devonian megaspore assemblages from northwestern Gondwana. The section is dated by a rich diverse miospore assemblage indicating the presence of the upper part of the AD pre-Lem Biozone up to the lower part of the TCo Oppel Zone, ranging from a latest Eifelian or earliest Givetian age up to a latest Givetian or an earliest Frasnian age. Seventeen megaspore taxa have been identified. Among them, two new species (Biharisporites lugardonii and Lagenicula milleri) and four new varieties (Corystisporites acutispinosus var. acutispinosus and var. bullatus, Heliotriletes longispinosus var. longispinosus and var. radiatus) are described. One new possible megaspore species is also described: Verruciretusispora labiosa sp. nov. One core sample (1293 ft, 394 m) contains several specimens of very large megaspores (ca. 1 mm), the largest known from Devonian localities (except for one specimen observed in the Givetian from Belgium). Among the 17 megaspore taxa from Libya, 6 are present on the Euramerican Continent. This observation is in accordance with previous palynological conclusions that favour the absence of palaeogeographic barriers between the Euramerican and Gondwanan continents that are suggested to be grouped together in a “Pre-Pangea” land mass. [less ▲] Detailed reference viewed: 49 (10 ULg)Paleophytogeographic distribution of Devonian miospore assemblages; Steemans, Philippe ; Conference (2009, September) Detailed reference viewed: 64 (5 ULg)Description and microscale analysis of some enigmatic palynomorphs from the Middle Devonian (Givetian of Libya)Steemans, Philippe ; Javaux, Emmanuelle ; et alin Palynology (2009), 33 Detailed reference viewed: 27 (7 ULg)Devonian mio-and megaspores in Western GondwanaSteemans, Philippe ; ; Conference (2008) Detailed reference viewed: 16 (0 ULg)Computer Assisted Spore Classification based on Ornament Spatial Distribution Analysis – An Application to Emsian Miospores from Saudi Arabia; ; et al Conference (2006) Detailed reference viewed: 47 (1 ULg) |
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