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The timing and length of continental rifting just isn’t extremely particularly constrained because of the reconstructions by by themselves,

Considering that the recognition of sea-floor anomalies that are spreading dates the postrift development of ocean crust. Usually the very first clear marine magnetic anomalies can be found rather 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 having less magnetic reversals (Scotian and north Newfoundland margins) through the Jurassic and Cretaceous Normal Polarities (

210-160 Ma and 118-83 Ma, correspondingly). More particular times for rifting would result from exposures on land and/or drilling of syn-rift sequences that are sedimentary. Other estimates could be created by extrapolating the prices of sea-floor spreading to your margin or by dating of sedimentary sequences or rocks on land. Continue reading