Geochronological, isotopic and aeromagnetic data, including a new Rb-S
r isochron of 1076 +/- 7Ma for volcanic rocks at Bertrab Nunatak, Coat
s Land, confirm the existence of rocks of Grenvillian age within both
East and West Antarctica and support the juxtaposition of Antarctica a
nd western North America in Neoproterozoic reconstructions.