- Rifting task continues for a considerable time frame before breakup and seafloor spreading that is subsequent. When it comes to Nova Scotian margin this era had been since great as 40-50 Ma, for the Newfoundland margin 30-40 Ma and for Labrador 40-65 Ma. Pulses of volcanic task during rifting may possibly occur causing platform uplift because of localized underplating and/or thinning associated with the lithosphere, however these pulses appear to be localized in place of local in level.
