Abstract
OCEAN floors seem to give a stratigraphie record only back to the mid-Mesozoic; and thus the positions of earlier mid-oceanic rises from seafloor evidence are not available. Continents preserve a much longer stratigraphie record, extending back to early Pre-Cambrian times and it is possible that the positions of pre-Mesozoic mid-oceanic rises can be inferred from the structures produced in any overlying continental area. Clifford1 has postulated convective upwellings in the Canadian shield from the distribution of basaltic dykes. Bailey2 and Dearnley3 noted the association of alkaline magmatism, basalt extrusion, rifting and zones of uplift; and Dearnley3 related them to convective upwellings.
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