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"Subduction at the Tethyan Trench probably caused the continents Africa and India to move towards Eurasia, which resulted in the opening of the Indian Ocean"
Inexpertly, the extensional slab-pull force, drawing Afro-India northwards towards Eurasia, would have stretched & thinned the Afro-Indian continental crust (if only along the northern shores of Gondwana). Indeed, crustal thinning, unto rifting, had previously pulled the Cimmerian Plate off from the northern coastline of Gondwana, beginning about 300 Ma. Perhaps those episodes of crustal thinning caused those coastal terrains to subside beneath then-neo-Tethys-sea-level? 18.104.22.168 (talk) 09:58, 18 October 2012 (UTC)