Abstract
In a recent paper, McCabe and Channell [1] report a Late Ordovician palaeomagnetic pole from the Shelve Inlier, Wales, and argue for a Iapetus Ocean of 30 degrees latitudinal width between Laurentia and Southern Britain in Late Ordovician times. They further suggest that Southern Britain lay in high latitudes adjacent to the northern margin of Gondwana at this time. Unlike McCabe and Channell we contend a primary Llanvirn (Mid-Ordovician) remanence age for the Shelve volcanics. Additionally, several important points regarding the palaeomagnetism of Southern Britain may have been overlooked by McCabe and Channell. In particular, re-examination of a previous palaeomagnetic study of the Shelve Inlier [2] reveals a dual polarity remanence, which passes a fold test at 95% confidence, and indicates temperature southerly palaeolatitudes of 32S _+ 8.
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