Figure F46. The Cretaceous/Paleocene boundary at Walvis Ridge Holes 1262B, 1262C, 1267A, and 1267B. A strong change in magnetic susceptibility (MS) and color reflectance (L*) indicate the Fe oxide–bearing nonbioturbated foraminifer nannofossil boundary layer. The interpolated bases of planktonic foraminifer zones are indicated by arrows and biostratigraphic sample locations by black squares. The records are all at the same scale.