Tracing the Source of the Elephant And Hippopotamus Ivory from ...

These flood basalts have 87 Sr/ 86 Sr values of 0.70304-0.70429 in the northwestern
Ethiopian highlands (data represented in Figure 47 by solid red circles; see Figure 61 for
geological map of the region and locations of samples tested).
Basalts from Southwestern Ethiopia were analyzed for strontium isotopes by
Ayalew et al. (1999), again demonstrating a small range of 0.7031-0.7039 (Figure 47,
represented by solid green triangles). Figure 62 illustrates the location of these samples.
Moreover, Barbieri et al. (1976) have similar values at an average of 0.7035 ± 0.0004 (n
= 6) for Late Tertiary-Quaternary basalts from the Harar Plateau, 50 km northeast of Gara
Badda (Kennan et al. 1990: 41).
Figure 62: Map of southwestern Ethiopia showing the main volcanic geology and sample
locations (white circles) (Ayalew et al. 1999: 383, figure 1).
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