The duration and timing of continental rifting is not too particularly constrained because of the reconstructions by by by themselves,

Considering that the recognition of sea-floor anomalies that are spreading dates the postrift development of ocean crust. Usually the first marine that is clear anomalies can be found instead far seaward from the margin, due either towards the existence of instead poor anomalies of uncertain beginning nearer to the margin (southern Newfoundland and Labrador margins) or even to the possible lack of magnetic reversals (Scotian and north Newfoundland margins) throughout the Jurassic and Cretaceous Normal…