Frontiers in Ecology and EvolutionThe Hirnantian Ice Age had a significant impact on marine invertebrate biota at the end of the Ordovician due to drastic cooling and falling sea levels.
Sara C. Memória +9 more
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Hirnantian glacial and deglacial record in SW Djado Basin (NE Niger). [PDF]
Geodinamica Acta, 2007 Pluridisciplinary fieldwork highlights features generated by an extended ice-sheet in the Djado Basin during the Hirnantian. Two glacial palaeovalley systems associated with glacial pavements and separated by thin glaciomarine interstadial series are revealed.
Denis, Michaël +4 more
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Discovery of trimerellide brachiopod Gasconsia from the Ordovician of Estonia [PDF]
Estonian Journal of Earth SciencesIn this study, the first trimerellide brachiopods from Estonia are described. They occur in the uppermost Katian (Upper Ordovician) shallow shelf environments and represent some of the largest Ordovician brachiopods.
Linda Hints, Jiayu Rong
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The youngest representatives of the genus Ribeiria Sharpe, 1853 from the late Katian of the Prague Basin (Bohemia) [PDF]
Estonian Journal of Earth Sciences, 2015 Ribeiria apusoides and Ribeiria johni sp. nov. are described from the late Katian of the Prague Basin (Bohemia) as the youngest representatives of the genus Ribeiria.
Marika Polechová
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The succession of Hirnantian events based on data from Baltica: brachiopods, chitinozoans, conodonts, and carbon isotopes [PDF]
Estonian Journal of Earth Sciences, 2008 The Hirnantian (late Ordovician) environment was complex and dynamic. Understanding the correct order of events and their precise correlation with a time scale are extremely important for the development of different kinds of environmental ...
Kaljo, Dimitri +3 more
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Carbon isotope chemostratigraphy of the Llandovery in northern peri-Gondwana: new data from the Barrandian area, Czech Republic [PDF]
Estonian Journal of Earth Sciences, 2014 The first complete δ13Corg record of the uppermost Hirnantian to lower Telychian strata of the Barrandian area (northern peri-Gondwana) is presented based on 168 new samples.
Jiří Frýda, Petr Štorch
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Geochemistry, Geophysics, Geosystems, Volume 27, Issue 2, February 2026.Abstract Widespread organic‐rich shales are associated with perturbations in productivity or preservation conditions; however, the major controlling factors, especially the phosphorus (P) and iron (Fe) interactions and their impacts on organic carbon burial in the paleolake ecosystem remain poorly understood.
Bo Wang +7 more
wiley +1 more source
Late Ordovician (Hirnantian) shelly fossils from New Zealand and their significance [PDF]
New Zealand Journal of Geology and Geophysics, 2004 Abstract A poorly preserved fauna of brachiopods, trilobites, corals, molluscs, bryozoans, echinoderms, and ostracods is described from Wangapeka Valley, northwest South Island. It can be dated to the latest Ordovician Hirnantian Stage, equivalent to Bolindian Bo4‐Bo5, by immediately underlying graptolite faunas ...
L. R. M. Cocks, Roger A. Cooper
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Fluid Inclusion Stratigraphy and Multistage Hydrocarbon Evolution in the Risha Gas Field, Jordan
Geofluids, Volume 2026, Issue 1, 2026.An integrated fluid inclusion stratigraphy (FIS) and petrographic analysis of the RH‐3 well in the Risha Gas Field, Jordan, reveals a highly compartmentalized vertical fluid column. The upper section (1200–1750 m) is dominated by wet‐gas to gas‐condensate fluids, transitioning to dry gas below 1850 m.
Mohamed Arafat +6 more
wiley +1 more source
The regional stratotype section and point for the base of the Hirnantian Stage (the uppermost Ordovician) at Mirny Creek, Omulev Mountains, Northeast Russia [PDF]
Estonian Journal of Earth Sciences, 2008 A complete Hirnantian sequence comprising the Normalograptus extraordinarius and N. persculptus biozones is well developed at the Mirny Creek section in the Omulev Mountains.
Koren, Tatyana N. +1 more
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