The Ordovician System was founded by Charles Lapworth in 1879, thereby ending years of dispute as to where the Cambrian System ended and the Silurian System began. The arguments for a tripartite division of the Lower Palaeozoic were almost entirely palaeontological, and amongst British geologists they were readily accepted. Soon afterwards the Ordovician System became generally adopted, though curiously, some Continental geologists were still using Gothlandian and Ordovician as subsystems of the Silurian as late as 1960. As time went by, as data accumulated, and mapping and stratigraphical practice became increasingly refined, a real need arose for comprehensive correlations for...

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