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- W1974098441 abstract "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. Further evidence of glaciation is now available from West Africa, South Africa, the Arabian Peninsula, eastern North America, west and central Southe America and Europe. Several glacial episodes can be distinguished. The earliest evidence (local mountain glaciation?) appears to be of Caradoc age. The major episode may have begun in Caradoc time and lasted much of Ashgill time, when a major ice-sheet covered at least North-Central and West Africa which was then centered near the South Pole. However, independent palaeontological and sea-level evidence from areas far removed from the centre of glaciation suggests a time span for this episode of less than 2 Ma. This conflict has yet to be resolved. The latest evidence of glaciation is Wenlock in age but is confined to South America, which by then was replacing Africa over the South Polar region. However, this latest episode may simply have been a rather intensive mountain glaciation rather than being of ice-sheet dimensions. The lack of land in the North Polar region probably explains the absence of tillites from the then northern hemisphere land masses. The total area affected by glaciation in Early Palaeozoic time in North Africa alone is at least 6 × 106 km2. Combined with other glaciated areas glaciation may have been on the scale of that of present-day Antarctica." @default.
- W1974098441 created "2016-06-24" @default.
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- W1974098441 date "1985-10-01" @default.
- W1974098441 modified "2023-10-03" @default.
- W1974098441 title "The late Ordovician—Early Silurian glacial period" @default.
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- W1974098441 doi "https://doi.org/10.1016/0031-0182(85)90089-6" @default.
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