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The duration and timing of continental rifting just isn’t really especially constrained because of the reconstructions by themselves,

The duration and timing of continental rifting just isn’t really especially constrained because of the reconstructions by themselves,

Considering that the recognition of sea-floor distributing anomalies just dates the postrift formation of ocean crust. Usually the very first marine that is clear anomalies are situated 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 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 dates for rifting would result from exposures on land and/or drilling of syn-rift sedimentary sequences. Читать далее

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