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Anomalous geomagnetic field during the late Ordovician
Nature, 1976MEASUREMENTS of the Lower Palaeozoic magnetic field in the British Isles1 show that it changed from around D=355°, I=−50° to D=20°, I=−54° (corresponding to an apparent shift of the south palaeomagnetic pole from 0° W to 35 °W along the present Equator) between Ordovician and Devonian times. Following unpublished work by W. E. Tremlett and J. C. Briden,
C. THOMAS, J. C. BRIDEN
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The Late Ordovician glacial record
2008An outline of the North Gondwanan, Late Ordovician glacial record is proposed. The related palaeogeographic domain extended from southern high palaeo-latitudes (southeastern Mauritania, Niger) to northern lower palaeo-latitudes (Morocco, Turkey, Sardinia) and covered a more than 4000 km-wide section perpendicular to ice-flow lines. Glacial advances are
Ghienne, Jean-François +3 more
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The late Ordovician—Early Silurian glacial period
Palaeogeography, Palaeoclimatology, Palaeoecology, 1985Abstract Late Ordovician to Early Silurian tillites and evidence of extensive glacial erosion were first discovered in the western Sahara in the late 1950's, although the concept of a glacial period at this time had been around since the late 19th century.
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AAPG Bulletin, 1982
The Neda iron formation is a hematite and goethite-rich oolitic ore which occurs in lens-shaped deposits on top of the Maquoketa Shale at only a few locations in the Wisconsin area. Its origin has been a puzzle for over a hundred years, but there have been suggestions that it is the westernmost extension of the Queenston Shale.
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The Neda iron formation is a hematite and goethite-rich oolitic ore which occurs in lens-shaped deposits on top of the Maquoketa Shale at only a few locations in the Wisconsin area. Its origin has been a puzzle for over a hundred years, but there have been suggestions that it is the westernmost extension of the Queenston Shale.
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Late Ordovician Mass Extinction: Earth, fire and ice
National Science Review, 2023David A T Harper
exaly
Late Ordovician glaciogenic reservoir heterogeneity
2012Daniel Paul Le Heron +3 more
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UNDERSTANDING THE LATE ORDOVICIAN MASS EXTINCTION
Geological Society of America Abstracts with Programs, 2021openaire +1 more source
LATE ORDOVICIAN EXPLOSIVE VOLCANISM IN SIBERIA
Geological Society of America Abstracts with Programs, 2018Camden Goland +7 more
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