Figure F16. NGR data from Holes 1257A (black), 1258B (blue), and 1258C (green) for two intervals in the Cretaceous black shales. The composite data from Holes 1258B and 1258C are offset by a constant (60 and 120 units, respectively) for illustration purposes. Although the core-to-core correlations between holes are easily established, the core gaps could rarely be spanned in these black shale sections.