276 Coonterunah oceanic flood basalt(O) event Arndt et al., this volume[578]
Location: NW. Australia (Pilbara craton)
Age: 3.515 Ga
Rating: B (7)
VOLCANIC ROCKS: Coonterunah (basalts & komatiites), Uz 3515±3 Ma Buick et al., 1995[684] Arndt et al., this volume[578].
277 Isua-1 event(s)
Location: S. West Greenland
Age: =3.79 Ga
Rating: C (possibly 7)
VOLCANIC ROCKS: older Isua mafic to ultramafic volcanic sequence Nutman, 1997[685] (cut by tonalite sheets dated at Uz 3790-3800 Ma Nutman et al., 1997[686]).
COMMENT: Younger supracrustal package at Isua dated at Uz 3710 Ma Nutman et al., 1997[686].