First Sentence

"Inferences about the pre-4.0 Ga geological history of the Earth have been based traditionally either on the study of the oldest identified remnants on the Earth's surface (e.g., Maas et al., 1992; Nutman et al., 1996; Amelin et al., 1999; Nelson et al., 2000; Ryder et al., 2000; Wilde et al., 2001; Mojzsis et al., 2001), or on modelling of the differentiation of global chemical reservoirs (e.g., Arndt Chauvel, 1990; Bennett et al., 1993; Bowring and Housh, 1995; Kramers and Tolstikhin, 1997; Snow and Schmidt, 1998; Albarede et al., 2000; Canfield et al., 2000; Nutman et al., 2001)."