Results 141 to 150 of about 254 (156)
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Pelmatozoan (crinoid?) columnals from the Hirnantian (Ordovician, Ashgill) of Keisley, Cumbria, UK
Proceedings of the Yorkshire Geological Society, 1995SUMMARY Few pelmatozoan faunas have been recorded from the Hirnantian. A Hirnantian columnal fauna from rottenstones above the Keisley Limestone in the Cross Fell Inlier at Keisley, Cumbria, includes a new species of disparid crinoid, Ectenocrinus britannicus, the youngest known member of this genus ...
S. K. Donovan, A. D. Wright
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The Hirnantian glacial landsystem of the Sahara: a meltwater-dominated system
Geological Society, London, Memoirs, 2016During the Hirnantian (443 Ma), ice sheets expanded towards the present-day north over North Africa and the Arabian Peninsula when the western part of the Gondwana supercontinent straddled the South Pole. A glacigenic succession is exposed around the flanks of several Saharan cratonic basins, including Murzuq and Al Kufrah basins in Libya.
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Katian prelude to the Hirnantian (Late Ordovician) mass extinction: a Baltic perspective
Geological Journal, 2011AbstractThe diversity of several groups of Late Ordovician fossils in the Baltic is discussed and corresponding curves are presented. The curves are correlated with the latest δ13C trend and probable sea surface temperatures of the equatorial ocean in order to link biodiversity and environmental changes.
Dimitri Kaljo +5 more
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Middle East Oil, Gas and Geosciences Show (MEOS GEO)
The Late Ordovician marked one of Earth's most profound climatic transitions, culminating in the Hirnantian glaciation and the second-largest mass extinction in the Phanerozoic (Finlay et al., 2010). Glacial advance during this stage extended as far as ∼30°S (Trotter et al., 2008; Phol et al., 2016; Cocks & Torsvik, 2021), sculpting widespread ...
Stefano Patruno +3 more
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The Late Ordovician marked one of Earth's most profound climatic transitions, culminating in the Hirnantian glaciation and the second-largest mass extinction in the Phanerozoic (Finlay et al., 2010). Glacial advance during this stage extended as far as ∼30°S (Trotter et al., 2008; Phol et al., 2016; Cocks & Torsvik, 2021), sculpting widespread ...
Stefano Patruno +3 more
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Stratigraphic evidence for Hirnantian glaciation in the Alborz Mountain Ranges, northeastern Iran
Palaeogeography, Palaeoclimatology, Palaeoecology, 2017Abstract The author examined the high-latitude Hirnantian diamictites of the Ghelli Formation and the early Silurian olive-gray shales of the Niur Formation exposed in the northeastern Alborz Mountains, Iran. These 404 m thick glacial deposits can be divided into three progradational-retrogradational cycles, each potentially controlled by the ...
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THE HIRNANTIAN ISOTOPE CARBON EXCURSION (HICE) IN SOUTHERN NORWAY
Geological Society of America Abstracts with Programs, 2017Mikael Calner +2 more
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Phosphorus cycling during the Hirnantian glaciation
Palaeogeography, Palaeoclimatology, PalaeoecologyJohann Müller +4 more
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Decreased marine organic carbon burial during the Hirnantian glaciation
Earth and Planetary Science LettersShengchao Yang, Junxuan Fan
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Steep oceanic DIC δ13C depth gradient during the Hirnantian Glaciation
Earth-Science ReviewsYang, Shengchao +12 more
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Dwarf cornulitid tubeworms from the Hirnantian (Late Ordovician) of Estonia
Historical BiologyOlev Vinn +4 more
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