Abstract
The last few hundred million years of Precambrian time saw the initiation of a world-wide network of mobile belts most of which were to remain active until well into the Phanerozoic eon. In Laurasia (Fig. 2.1) this system was built around a fairly small number of cratons; most parts of the system remained mobile at least until the end of Lower Palaeozoic times and some are still in being at the present day. In Gondwanaland, the mobile belts enclosed a rather larger number of smallish cratons; much of this southern network was effectively stabilised well before the end of the Lower Palaeozoic and only a few branches remained active in later Phanerozoic times.
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