Abstract
ISOTOPIC age determinations indicate the existence of a widespread 500 × 106 yr thermal and metamorphic event, the “Pan African orogeny”, which has affected most of the African shield outside three cratonic areas1. Black2 has discussed the effects of this event on the West African craton and has concluded that it has the status of an orogeny. He drew attention to the way late Pre-Cambrian sediments lie partly on the craton and partly on the areas involved in the orogeny where they have been folded and metamorphosed.
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References
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GRANT, N. Complete Late Pre-Cambrian to Early Palaeozoic Orogenic Cycle in Ghana, Togo and Dahomey. Nature 215, 609–610 (1967). https://doi.org/10.1038/215609a0
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DOI: https://doi.org/10.1038/215609a0
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