In addition, a number of papers were presented, for comparative purposes, on other margins and analogues from older rifted
margins now exposed on land.
The total length of rifted
margin was more than 25,000 km, suggesting a staggered climatic response to uplift as rifting progressed diachronously, somewhat like a zipper.
Instead of rifted
blocks littering the edge of the continent, Norway's continental margin is underlain by a series of gently dipping reflectors that tilt away from the continent.
These are generally interpreted as remnants of the cratonic crust that was rifted
during Mesoproterozoic extension, the eastern limit of which may be reflected in a prominent series of west-facing crustal-scale homoclines beneath the Foreland Belt.
This contends that the platform began to grow about 160 million years ago, after the African and North American plates were rifted
apart, opening the Atlantic Ocean.