Iridium and other element concentrations and magnetostratigraphy across the Cretaceous/Tertiarty boundary in ODP Hole 122-761C, supplement to: Rocchia, Robert; Boclet, Daniel; Bonté, Philippe; Froget, Laurence; Galbrun, Bruno; Jehanno, Celestine; Robin, Eric (1992): Iridium and other element distributions, mineralogy, and magnetostratigraphy near the Cretaceous/Tertiary boundary in Hole 761C. In: von Rad, U; Haq, BU; et al. (eds.), Proceedings of the Ocean Drilling Program, Scientific Results, College Station, TX (Ocean Drilling Program), 122, 753-762

Robert Rocchia, Daniel Boclet, Philippe Bonté, Laurence Froget, Bruno Galbrun, Celestine Jehanno & Eric Robin
Samples from Ocean Drilling Program Hole 761C, collected on both sides of the Cretaceous/Tertiary boundary have been analyzed for their chemical and mineralogical content. The sediment consists of nannofossil ooze with variable amounts of clay. The boundary is marked by a color change associated with a nearly step-like decrease of the carbonate fraction. Paleomagnetic data and the drop of the carbonate content indicate that a strong reduction of the sedimentation rate occurred at the boundary...
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