نتایج جستجو برای: chitinozoans
تعداد نتایج: 32 فیلتر نتایج به سال:
Well-preserved miospore assemblages are recorded from the Late Ordovician (Katian-Hirnantian), Ghelli Formation in Pelmis-gorge at the north-eastern Alborz Mountain The palynomorphs were extracted from siliciclastic deposits which are well-dated by using of marine palynomorphs (acritarchs and chitinozoans). The encountered miospore assemblages consist of 14 genera (28 species: 26 cryptospores a...
Ordovician limestone-marl alternations in the Oslo-Asker District have been interpreted as signaling glacio-eustatic lowstands, which would support a prolonged "Early Palaeozoic Icehouse". However, these rhythmites could alternatively reflect differential diagenesis, without sedimentary trigger. Here, we test both hypotheses through one Darriwilian and three Katian sections. Our methodology con...
An integrated palynological and geochemical approach has been initiated to date precise the events of Pimenteiras Formation, in Late Devonian from Parnaíba Basin, Brazil. Based on good biostratigraphic markers presence index species among miospores, acritarchs chitinozoa, investigated sequences are referred Middle early Frasnian. Among Miospores, Chelinospora concinna Verrucosisporites bullifer...
Abstract The Arenig Fawr area of North Wales constitutes the type for British Lower to Middle Ordovician Series and is complemented by sections in Carmarthen Whitland areas South Wales. We describe chitinozoan assemblages from both order aid correlation its region with global series stages. Chitinozoans recorded provide permissive rather than conclusive evidence but suggest that Henllan Ash Mem...
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