Roadien: verschil tussen versies

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'''Externe links:'''
*{{en}}[http://wwwmsee140lnx10.stratigraphyecn.orgpurdue.edu/resources/geowhen/stages/Roadian.html ''Roadian'', GeoWhen Database]
*{{en}}Norges Network of offshore records of geology and stratigraphy: [http://norges.uio.no/timescale/Fig15.2_Perm-colA.pdf ''Stratigraphic chart for the Permian'']
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