Abstract
SUMMARY A palaeomagnetic pole is reported from late Tremadoc-early Arenig volcanics of the Treffgarne Volcanic Formation, southwest Wales. This pole, located at N56, E306 (dpldm = 9/10), implies that Southern Britain was positioned at c. 60s during Early Ordovician times. These data are considered palaeomagnetically reliable based upon a positive intraformational conglomerate test. Comparison with palaeomagnetic results from the southern Laurentian margin suggests the intervening Iapetus Ocean to have reached a width of at least 5000 km at this time. A partial magnetic overprint of Hercynian age is also identified (pole: S42, E346, dpldm = 5/9) and is correlated with similar remagnetization features across southern and central Wales. Geological indicators of palaeotemperature in the south/central Welsh Basin most likely reflect a Hercynian thermochemical pulse.
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