Abstract
The Pre-Cambrian rocks of southern Britain are interpreted as the basement, metasediments, metavolcanics and post-orogenic igneous rocks of at least two intersecting chelogenes. The Longmyndian, Monian and Arvonian are related to the younger of these (Upper Proterozoic) and Charnian, Uriconian, Malvernian and other intrusive complexes to the older Lower and Middle Proterozoic chelogene. Dykeswarm phases separate the two cycles. It is not clear whether the Rosslare Complex developed during the earlier cycle or formed part of its basement.
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