New 87Sr/86Sr dating allows the correlation of a marker horizon within the prolific Late Cretaceous #ITGunnarites antarcticus#ME faunal assemblage of the Cape Lamb Member, Snow Hill Island Formation, Vega Island, Antarctica with reference sections in Europe and the USA. This horizon is between 81.5 and 96.5m above the base of the #ITG. antarcticus#ME assemblage. Replicate analysis of six macrofossils from within it yielded a mean value for 87Sr/86Sr of .707 735 9 ± .000 004 3 (±2 s.e., n=17). This ratio in turn yields a numerical age of 71.0 ± 0.2 Ma when compared to the standard 87Sr/86Sr reference curve for the latest Cretaceous, for which the Campanian-Maastrichtian boundary is placed at 71.3 ± .5 Ma. The value of .707 735 9 ± .000 004 3 correlates to a level in the #ITBelemnella lanceolata#ME belemnite Zone of the Chalk of northwestern Germany that is 2.5 ± 5 m beneath the base of the overlying #ITB. pseudobtusa#ME Zone (and 7.5 m above the Campanian-Maastrichtian belemnite boundary), and to an interval within the ammonite zonation of the US Western Interior that spans the early Maastrichtian #ITBaculites baculus#ME and #ITB. eliasi#ME zones, but with a most likely level within the #ITB. eliasi#ME Zone. An earliest Maastrichtian age is thereby determined for the Antarctic horizon, and indeed for the entire #ITG. antarcticus#ME assemblage. #ITGunnarites, sensu lato#ME, is an important ammonite marker for the base of the Maastrichtian throughout the southern high-latitude regions, and the associated large heteromorph ammonite #ITDiplomoceras#ME may comprise a macrofossil link back to the Maastrichtian type sections.