Siderophilic element concentrations are high in sediments from the Cretaceous–Tertiary
boundary. An extraterrestrial source is indicated. Concentrations are too high to be …

Closely spaced samples from an uninterrupted calcareous pelagic sequence across the
Cretaceous–Tertiary boundary reveal that the extinction of planktonic Foraminifera and …

The hypothesis that a catastrophic impact of an extraterrestrial body caused the terminal
Cretaceous mass extinctions of dinosaurs, planktonic foraminfera and other species is now …

Abstract A 2.3-Myr-old layer in a sediment from the Antarctic Ocean contains Ir and Au at
levels comparable with those at the Cretaceous–Tertiary boundary. A sizable fraction of the …

The magnetic fraction of some Cretaceous–Tertiary (K–T) boundary sediments sampled at
two locations in Italy, contains a spheroidal component which has retained some relict …

The Nd isotope composition of chemical and clastic sediments surviving from the Archaean
provides no evidence for the existence of pre-4,000-Myr continental crust. Either the …

The biogeochemical cycles of iron and organic carbon are strongly interlinked. In oceanic
waters, organic ligands have been shown to control the concentration of dissolved iron. In …

The abundances of highly siderophile (iron-loving) elements (HSEs) in the Earth's mantle
provide important constraints on models of the Earth's early evolution. It has long been …

The metalliferous sediment deposits of the Atlantis II Deep in the Red Sea are an example of
submarine hydrothermal deposits at a spreading centre. The brine salinities (∼ 270% for the …

THE discovery of high concentrations of iridium in Cretaceous/Tertiary boundary sediments
engendered the hypothesis1 that a meteorite collided with the Earth 65 million years ago …