Abstract
Siderophilic element concentrations are high in sediments from the Cretaceous–Tertiary boundary. An extraterrestrial source is indicated. Concentrations are too high to be understood in terms of the impact of a chondritic asteroid. Either the projectile was a metal-sulphide core or the infailing material (probably weak cometary matter) was slowed down during atmospheric passage.
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Kyte, F., Zhou, Z. & Wasson, J. Siderophile-enriched sediments from the Cretaceous–Tertiary boundary. Nature 288, 651–656 (1980). https://doi.org/10.1038/288651a0
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DOI: https://doi.org/10.1038/288651a0
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