Editing Rift (section)

===Multiphase rifting===
Some rifts show a complex and prolonged history of rifting, with several distinct phases. The [[Geology of the North Sea|North Sea rift]] shows evidence of several separate rift phases from the [[Permian]] through to the Earliest [[Cretaceous]],<ref name="Rodmar">{{cite book|last=Ravnås|first=R. |author2=Nøttvedt A. |author3=Steel R.J.  |author4=Windelstad J.|publisher=[[Geological Society]]|location=London|year=2000|series=Special Publications|volume=167|title=Dynamics of the Norwegian Margin|pages=133–177|chapter=Syn-rift sedimentary architectures in the Northern North Sea|isbn=9781862390560|chapter-url=http://sp.lyellcollection.org/content/167/1/133.abstract|access-date=28 October 2012}}</ref> a period of over 100 million years.