Our understanding of the complex interplay of geodynamic processes that operate during lithospheric extension and results in the formation of magmatic and amagmatic passive margins remains equivocal. The challenge of the third rift conference in the series was, how to better constrain interpretation of those mechanisms, contributing to the surface expression at rifted plate margins. The fundamental observation that not all extensional basins and rifted continental margins involve the development of process-related magmatism continues to court significant debate and controversy (Rifts III: Catching the Wave, Geological Society, London – this conference). Consensus remains elusive; however empirical data are providing...

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