Geochemical studies of the Cretaceous-Tertiary boundary in ODP Holes 113-689B and 113-690C, supplement to: Michel, Helen V; Asaro, Frank; Alvarez, Walter; Alvarez, Luis W (1990): Geochemical studies of the Cretaceous/Tertiary boundary in ODP Holes 689B and 690C. In: Barker, PF; Kennett, JP; et al. (eds.), Proceedings of the Ocean Drilling Program, Scientific Results, College Station, TX (Ocean Drilling Program), 113, 159-168

Helen V Michel, Frank Asaro, Walter Alvarez & Luis W Alvarez
In a study of ODP Hole 689B no iridium (Ir) anomaly was found in Sections 1 through 6 of Core 25X or in Core 26X from the top down to section 2, 3-12 cm. The background Ir abundance averaged 11 parts per trillion (ppt) and a clay-enriched region had nearly the same average, 26 ± 12 ppt. If the Cretaceous-Tertiary (K-T) contact is in the region studied, then sedimentation was not continuous, and the K-T...
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